Alpha Instruments Inc.

THE APPLICATIONS OF LOW DIFFERENTIAL PRESSURE SENSOR IN DATA CENTER(2021年11月26日)

alphainstruments — 2021-11-26T11:45:29+0900

https://www.alphainstruments.com/low-differential-pressure-transducers-transmitters/

As a professional differential pressure transmitter manufacturer, Alpha instruments Inc was founded in 2005, in Massachusetts, US. We specialized in the development and manufacture of low differential pressure transducer, which were applied in HVAC, Critical Environments, Medical Industry, Semiconductor Equipment, etc.

There are intensive equipment in data center, where the heat is concentrated，at the same time, these precision equipment have high requirements for the temperature, humidity and cleanliness of the environment, therefore, it is necessary to have a reasonable airflow organization and distribution to effectively remove the heat in the machine room, so as to ensure that the machine room meet the environmental requirements of equipment such as temperature, humidity, cleanliness and air supply speed.

The low differential pressure sensor is mainly used to monitor the pressure difference between the two ends of the filter in the air conditioning system, participating in the variable air volume control system (VAVBox) and monitoring the pressure difference between the machine room, other rooms and corridors.

The filter in the air conditioning system is used to filter dust and impurities in the ventilation duct. As time accumulates, the dust on the filter will accumulate, which will gradually affect the air circulation of the filter. Due to poor air circulation, the pressure difference between the two ends of the filter increases continuously. The differential pressure transducer detects the pressure change, and the upper computer receives the signal from the low differential pressure sensor, when the signal value reaches the alarm point, it will start an alarm to remind of replacing or cleaning the filter.

The VAV controller adjusts the air supply volume and the temperature within the set range according to the actual temperature detected by the temperature sensor and the difference with the set temperature, the low differential pressure sensor detects the pressure change in the air duct to determine the air supply volume.

In order to ensure the air quality in the computer room, the primary room should maintain positive pressure. The pressure difference between the primary room, other rooms, and corridors should not be less than 5Pa, and the static pressure difference between the primary room and the outdoor should not be less than 10Pa. Using the low differential pressure sensor to monitor it can prevent the infiltration of outdoor air from destroying the environmental parameters in the machine room.

THE TYPES OF LOW DIFFERENTIAL PRESSURE SENSOR(2021年11月26日)

alphainstruments — 2021-11-26T11:44:57+0900

https://www.alphainstruments.com/product/model-165-differential-pressure-transmitter/

The low differential pressure sensor is generally divided into three categories: piezoresistive sensor, capacitive transducer and microelectromechanical (MEMS) sensor.

1. Piezoresistive sensor
Piezoresistive sensor is usually made of silicon and is bonded to a steel substrate by the adhesive effect between metals. When pressure is applied, this single-crystal diaphragm will deform, so that the resistance in the Wheatstone bridge will detect the pressure and then output the voltage proportionally. Piezoresistive sensor has good resolution and bandwidth, which is suitable for the applications with insufficient budget.

But this type of sensor also has its limitations. It is very sensitive to temperature changes and tend to drift. What is worse, this type of sensor cannot provide a large enough area to induce pressure to produce effective diaphragm deformation. It is no doubt that the diaphragm can be made thinner, but this will reduce its strength and integrity as well as also increase the cost. When used for low pressure measurement, its measurement results are noisy and the long-term stability is poor. Therefore this type of sensor is more suitable for high pressure measurement.

2. Capacitive sensor
Capacitance-based pressure sensor has become the mainstream of pressure measurement applications. Compared with piezoresistive pressure sensor, capacitive type pressure transducer has higher pressure sensitivity and lower temperature sensitivity.

Other advantages also include: simple design, no need to use special materials, low energy consumption, high resolution and low cost.

The capacitive sensor consists of a compact housing and two insulated metal plates placed in parallel inside. One of the metal plates adopts a metal diaphragm, which can be slightly deformed under pressure, and the other one is an insulated stainless steel electrode. When a pressure difference is applied to the metal diaphragm, the metal diaphragm will be displaced relative to the fixed electrode, which will change the capacitance. The linear comparison circuit detects that the capacitance change generated is proportionally amplified and outputs a high-level voltage signal. The deformation of the metal diaphragm is extremely small, which is beneficial to reduce the hysteresis and repetitive errors as well as speed up the response.

3. Microelectromechanical (MEMS) sensor
MEMS (Microelectro Mechanical Systems) sensor is a common capacitive sensor. It etches actuators, mechanical parts and electronic devices on the silicon substrate by using microlithography technology, which can be manufactured in large quantities at low cost. In addition, its volume is constantly shrinking, and its diaphragm area has been reduced to 13mm².

However, this miniaturization trend also limits performance, such as insensitivity, inaccuracy and signal drift. Because it is made of brittle materials, MEMS sensor is prone to fracture under high stress and cannot withstand excessive force. The biggest limitation of capacitive MEMS sensors is that miniaturization limits its pressure sensitivity in high-pressure applications.

THE WORKING PRINCIPLE OF LOW DIFFERENTIAL PRESSURE SENSOR(2021年11月26日)

alphainstruments — 2021-11-26T11:44:24+0900

https://www.alphainstruments.com/low-differential-pressure-transducers-transmitters/

The low differential pressure sensor is a typical sensor, which has certain applications in various industries. It is also a commonly used sensor. The following is an introduction to the working principle of the low differential pressure sensor.

The two pressures of the measured medium of the low differential pressure sensor enter into the high and low pressure chambers, and act on the isolation diaphragms on both sides of the δ element (that is the sensitive element). Then they are transmitted to the both sides of measuring diaphragms through the isolation diaphragms and the filling liquid in the elements. The electrodes on the measuring diaphragms and the isolation diaphragms on both sides constitute a capacitor respectively.

When the pressures on both sides are inconsistent, the measuring diaphragms will be displaced, and the displacement is proportional to the pressure difference, therefore, the capacitance on both sides is not equal, which is converted into a signal proportional to the pressure through the oscillation and demodulation link. The working principle of pressure transmitter and absolute pressure transmitter is the same as that of differential pressure sensor the difference is that the pressure in the low pressure chamber is atmospheric pressure or vacuum.

THE ERRORS IN DIFFERENTIAL PRESSURE TRANSMITTER(2021年11月26日)

alphainstruments — 2021-11-26T11:43:45+0900

https://www.alphainstruments.com/product/model-168-differential-pressure-transmitter/

No matter what the transmitter is, there will always be some unavoidable problems in the process of using, such as the inevitable errors of the differential pressure transmitter. And we are able to consider comprehensively when choosing the differential pressure transmitter, such as the accuracy and linearity of the differential pressure transmitter, so as to avoid the errors of the differential pressure transmitter as much as possible. Generally, there are four unavoidable errors in differential pressure transmitters, and a brief introduction is as follows.

1. Linear error: This is a factor that has less influence on the initial error of the dp pressure transmitter. The cause of the error is the physical non-linearity of the silicon chips. However, for the transmitter with amplifier, it should also include the non-linearity of the amplifier.

2. Offset error: Since the vertical offset of the differential pressure transmitter remains constant throughout the pressure range, the variations of the transmitter diffusion and laser adjustment correction will produce offset errors.

3. Hysteresis error: In most cases, the hysteresis error of the differential pressure transmitter can be completely negligible, because the silicon chips have a very high mechanical rigidity. In general, only the hysteresis error needs to be considered in the case when the pressure changes greatly.

The above three errors are unavoidable. Now can only try to choose a differential pressure transmitter, of which the precision that is suitable for oneself. Using good production equipment and technology to reduce these errors and it is also possible to perform error calibration before leaving the factory to minimize the impact of errors.

HOW TO CHOOSE A RIGHT PRESSURE TRANSDUCER/TRANSMITTER?(2021年11月26日)

alphainstruments — 2021-11-26T11:43:10+0900

https://www.directindustry.com/industrial-manufacturer/capacitive-pressure-sensor-91627.html

There are multiple types of pressure transducers for a variety of applications. Each pressure transducer has different aspects that will impact how it works and the applications the pressure transducer works best for. When selecting a pressure transducer, keep these five criteria in mind:

1.Pressure range:
First of all, it is important to choose a sensor with a measuring range that corresponds with the pressure range you need to measure, taking into account normal conditions and possible occasional pressure variations.Alpha provide Unidirectional minimum range is 0-25Pa(0-0.1 in.WC) and maximum range is 0-25000Pa(0-100 in.WC) ;Bidirectional minimum range is -10Pa to 10Pa(-0.05 to 0.05 in. WC) and maximum range is -10000Pa to10000Pa(-50 to 50 in. WC)

2.Stability
Long-term stability is one of the most important parameters that determine the overall measurement accuracy of a pressure sensor. Long-term stability in pressure sensors is defined by the maximum acceptable change in zero and span values during the course of the calibration interval of the sensor. In short, for a sensor to be considered stable, it should maintain a very low drift in its measurements over the calibration interval. Alpha stability is ±0.5% FS/YR which higher than most of the others.

3.Over pressure
Overpressure refers to the maximum pressure value a transducer can withstand without affecting performance; it can also refer to a situation where the pressure value exceeds the limits. Although it is not ideal, pressure transducers can withstand occasional pressures up to their overpressure rating, eventually returning to their natural state. However, pressures that reach burst pressure, the maximum pressure that may be applied to the positive pressure port without physically damaging the internal sensing component, can rupture the diaphragm and cause leakage. Pressures above overpressure but below burst pressure can result in permanent diaphragm deformation, causing an output shift affecting operational performance or accuracy readings.

4.Accuracy
Pressure gauges come in many different accuracies. Accuracy of common pressure transducers could range from 0.5% to 0.05 % of the full-scale output. While Alpha focus on high accuracy from 0.6%-0.25% for very low pressures for critically demanding applications.

5.Compensation range
The compensated temperature range defines the limits of operation for specified measurement accuracy. e.g. A pressure sensor has an accuracy of 0.25% full scale over a compensated temperature range of -20 to +80 degC.

Since temperature errors are often significant for many measurement devices, a manufacturer will incorporate digital or analogue temperature compensation. If the measurement device is used outside the compensated temperature range, the accuracy statement is no longer valid, because the device has not been tested or compensated for that temperature.

6.Why choose a capacitive pressure sensor
In a capacitive pressure sensor, the membrane is one of the capacitor plates. Under pressure, the membrane deforms, varying the capacitance of the capacitor. These sensors provide a good level of accuracy and sensitivity, they can measure low pressures, in the mbar range.

Model 178 LCD Display Differential Pressure Transmitter(2020年11月10日)

alphainstruments — 2020-11-10T16:37:00+0900

https://www.alphainstruments.com/product/model-178-differential-pressure-transmitter/

The Model 178 Series variable pressure sensor are low range differential pressure transmitters. Each unit features a push-activated ZERO function and an associated LCD display. With a convenient push button, the zero calibration can be performed without any additional equipment. It is with NEMA 4 (IP-65) rated aluminum enclosures, they are very rugged and very reliable.
The Model 178 Series surface mount pressure transducer/sensor is available for full scale pressure range from 0 to 0.1″WC till 0 to 100″WC. Both unidirectional and bidirectional pressure ranges are offered. The output of the Model 178 Pressure Transducer is available in two versions: 0 to 5VDC and 0 to 10VDC, where 0VDC is true zero without offset. The output of Model 178 Pressure Transmitters is 4 to 20 mA. All units are temperature compensated. The accuracy can be 0.6%, 0.4% or 0.25% at room temperature. Bidirectional pressure transducer available on alphainstruments.com, feel free to contact!
The patented variable capacitance pressure sensor is constructed by stainless steel and glass, no glue or other organics. That provides excellent performance, corrosion resistance and long-term stability.
Key Features of Alpha 178 variable capacitance pressure sensor:
3-1/2 Digit LCD Display
Push Button Zero Calibration
Up to 15 PSI Proof Pressure on all Ranges
Miswiring Full Protection
Rugged Aluminum Housing Rated NEMA 4/IP65
Specification of Alpha 178 surface mount pressure sensor:
Accuracy: ±0.25%, ±0.40% or ±0.60% of span
Differential Pressure Ranges:
Unidirectional: 0.10 in.W.C. to 100.00 in.W.C.
Bidirectional: ±0.10 in.W.C. to ±50.00 in.W.C.
NEMA 4/IP65; Die-cast aluminum
Mounting: surface mount
Output signal: current or voltage
Process Applications of Alpha 178 surface mount pressure transducer:
HVAC and VAV Control
Clean Room and Isolation Rooms
Duct Static Pressure Measurement
Draft Control and Fume Hood Control
Furnace Air Flow Control
Power Plant Air Flow Monitor and Control

Model 178A Front Panel Mounting Differential Pressure Transmitter(2020年11月10日)

alphainstruments — 2020-11-10T16:36:21+0900

https://www.alphainstruments.com/product/model-178a-differential-pressure-transmitter/

The model 178A Series surface mount pressure transducer are low-range differential pressure transmitters. Each unit features a push-activated ZERO function and an associated LCD display. With a convenient push button, the zero calibration can be performed without any additional equipment. It significantly reduces time and cost for users.
The 178A series pressure differential monitor has a SS304 front panel and an IP65/NEMA 4 rated aluminum die casting enclosure to withstand environmental effects. The pressure ranges from 0.1″WC to 100″WC, unidirectional or bidirectional. The output is 2-wire 4 to 20mA, fully protected against short circuiting and incorrect wiring.
All units are temperature compensated. 0.6%, 0.4% and 0.25% accuracies are available. The patented stainless steel diaphragm sensor provides good corrosion resistance,excellent repeatability and long term stability.
Key Features of Alpha 178A pressure monitor:
SS304 Front Panel Mounting
3-1/2 Digit LCD Display
Push Button Zero Calibration
Up to 15 PSI Proof Pressure on all Ranges
Miswiring Full Protection
Rugged Aluminum Housing Rated NEMA 4/IP65
Specification of Alpha 178A pressure differential monitor:
Accuracy: ±0.25%, ±0.40% or ±0.60% of span
Differential Pressure Ranges:
Unidirectional: 0.10 in.W.C. to 100.00 in.W.C.
Bidirectional: ±0.10 in.W.C. to ±50.00 in.W.C.
NEMA 4/IP65; Die-cast aluminum
Mounting: surface mount
Output signal: current or voltage
Process Applications of Alpha 178A pressure sensor:
HVAC and VAV Control
Clean Room and Isolation Rooms
Duct Static Pressure Measurement
Draft Control and Fume Hood Control
Furnace Air Flow Control
Power Plant Air Flow Monitor and Control

Model 175 Push Button Zero Differential Pressure Transducer(2020年11月10日)

alphainstruments — 2020-11-10T16:35:48+0900

https://www.alphainstruments.com/product/model-175-differential-pressure-transmitter/

The model 175 Series high accuracy pressure transducers/transmitters are low-range differential pressure transducers and transmitters. Each unit features a push-activated ZERO function and an associated LED lamp indicator. With a convenient pushbutton, the zero calibration can be performed without any additional equipment. It significantly reduces time and cost for users. The unique bi-color LED indicates if the transducer is at normal operation, over pressure, or in the process of zero calibration. It also reports if the unit is badly damaged.
The enclosure consists a flame retardant plastic top cover and a stainless steel bottom plate for ruggedness.
The pressure ranges from 0.1″WC to 100″WC, unidirectional or bidirectional. The output can be 3-wire 0 to 5V, 0 to 10V, or 2-wire 4 to 20 mA, fully protected against short circuiting and incorrect wiring. All units are temperature compensated. 0.6%, 0.4% and 0.25% accuracy are available.
The patented stainless steel diaphragm sensor provides good corrosion resistance, excellent repeatability and long term stability.
Key Features of Alpha 175 ultra low pressure sensor:
Green/Red Bi-Color LED to Indicate The Working Status
Push Button Zero Calibration
Up to 15 PSI Proof Pressure on all Ranges
Detachable Euro Style Terminal Block
Miswiring Full Protection
Unsymmetrical Bidirectional Pressure Ranges
True Zero Output for Voltage Unit
Specification of Alpha 175 very low differential pressure transducer:
Accuracy: ±0.25%, ±0.40% or ±0.60% of span
Differential Pressure Ranges:
Unidirectional: 0.10 in.W.C. to 100.00 in.W.C.
Bidirectional: ±0.10 in.W.C. to ±50.00 in.W.C.
NEMA 1; ABS enclosure
Mounting: surface mount
Output signal: current or voltage
Process Applications of Alpha 175 very low pressure sensor:
HVAC and VAV Control
Clean Room and Isolation Rooms
Duct Static Pressure Measurement
Draft Control and Fume Hood Control
Furnace Air Flow Control
Power Plant Air Flow Monitor and Control
You may also interested in ultra low pressure transducer.

Model 168 intrinsically safe Differential Pressure Transducer(2020年11月10日)

alphainstruments — 2020-11-10T16:35:11+0900

https://www.alphainstruments.com/product/model-168-differential-pressure-transmitter/

Model 168 series intrinsically safe pressure transducers are low range differential pressure transducers and transmitters with NEMA 4 (IP-65) rated aluminum enclosures. They are very rugged and very reliable, good for many industrial applications.

The pressure range covers from 0.1″WC to 100″WC, unidirectional or bidirectional. The output can be 3-wire 0 to 5V, 0 to 10V, or 2-wire 4 to 20 mA, fully protected against short circuit and incorrect wiring. In the voltage version, the output can go down to true zero. The units are temperature compensated. The accuracy can be 0.6%, 0.4% or 0.25% at room temperature.
The patented stainless steel intrinsically safe pressure sensor provides good corrosion resistance, excellent performance and long term stability.
Our unique production setup can also make special pressure range (e.g. -0.5″WC to +3.5″WC) to meet special applications.
Key Features of Alpha 168 intrinsically safe pressure transducer:
Up to 15 PSI Proof Pressure on all Ranges
Miswiring Full Protection
Unsymmetrical Bidirectional Pressure Ranges
True Zero Output for Voltage Unit
Specification of Alpha 168 intrinsically safe pressure transmitter:
Accuracy: ±0.25%, ±0.40% or ±0.60% of span
Differential Pressure Ranges:
Unidirectional: 0.10 in.W.C. to 100.00 in.W.C.
Bidirectional: ±0.10 in.W.C. to ±50.00 in.W.C.
NEMA 4/IP65; Die-cast aluminum
Mounting: surface mount
Output signal: current or voltage
Process Applications of Alpha 168 intrinsically safe pressure sensor:
HVAC and VAV Control
Clean Room and Isolation Rooms
Duct Static Pressure Measurement
Draft Control and Fume Hood Control
Furnace Air Flow Control
Power Plant Air Flow Monitor and Control

Model 167 DIN Rail Mount Differential Pressure Transducer(2020年11月10日)

alphainstruments — 2020-11-10T16:34:33+0900

https://www.alphainstruments.com/product/model-167-differential-pressure-transmitter/

Model 167 series negative pressure sensors are low range differential pressure transducers and transmitters. It was specially designed for 35mm DIN Rail Mount, which dramatically reduces the required mounting space and installation cost. The green and red LED indicators show the working status of the unit in the field.
The pressure range covers from 0.1”WC to 100”WC, unidirectional or bidirectional. The output can be 3-wire 0 to 5V, 0 to 10V, or 2-wire 4 to 20 mA, fully protected against short circuit and incorrect wiring. In the voltage version, the output can go down to true zero. The units are temperature compensated. The accuracy can be 0.6%, 0.4% or 0.25% at room temperature.
The patented stainless steel negative pressure transducer provides good corrosion resistance, excellent performance and long term stability.
Our unique production setup can also make special pressure range (e.g. -0.5”WC to +3.5”WC) to meet special applications.

Key Features of Alpha 167 negative pressure transducer:
Up to 15 PSI Proof Pressure on all Ranges
LED working status indicators
DIN Rail Mount
Detachable Euro style terminal block reduces wiring errors and field wiring time.
Miswiring Full Protection
Unsymmetrical Bidirectional Pressure Ranges
True Zero Output for Voltage Unit
Specification of Alpha 167 negative pressure transmitter:
Accuracy: ±0.25%, ±0.40% or ±0.60% of span
Differential Pressure Ranges:
Unidirectional: 0.10 in.W.C. to 100.00 in.W.C.
Bidirectional: ±0.10 in.W.C. to ±50.00 in.W.C.
NEMA 1; ABS enclosure
Mounting: DIN rail or surface mount
Output signal: current or voltage
Process Applications of Alpha 167 negative pressure monitor:
Power plant air flow monitor and control
Textile Machinery
Clean room and fume hood control
Duct static pressure measurement
Draft Control
HVAC and VAV control
Furnace air flow control

Model 166 Cost-effective Differential Pressure Transducer(2020年11月10日)

alphainstruments — 2020-11-10T16:33:53+0900

https://www.alphainstruments.com/product/model-166-differential-pressure-transmitter/

Model 166 series cost effective pressure transducer are low range differential pressure transducers and transmitters. It features a flame retardant plastic enclosure with a metal backing. The unique design makes it can be used at outdoor environment and with easy access to zero and sensitivity adjustments.
The pressure range covers from 0.1″WC to 100″WC, unidirectional or bidirectional. The output can be 3-wire 0 to 5V, 0 to 10V, or 2-wire 4 to 20 mA, fully protected against short
circuit and incorrect wiring. In the voltage version, the output can go down to true zero. The units are temperature compensated. The accuracy can be 0.6%, 0.4% or 0.25% at room temperature.
The patented stainless steel cost effective pressure sensor provides good corrosion resistance, excellent performance and long term stability.
Our unique production setup can also make special pressure range (e.g. -0.5″WC to +3.5″WC) to meet special applications.
Key Features of Alpha 166 cost effective pressure sensor:
Up to 15 PSI Proof Pressure on all Ranges
Miswiring Full Protection
Unsymmetrical Bidirectional Pressure Ranges
True Zero Output for Voltage Unit
Specification of Alpha 166 cost effective pressure transducer:
Accuracy: ±0.25%, ±0.40% or ±0.60% of span
Differential Pressure Ranges:
Unidirectional: 0.10 in.W.C. to 100.00 in.W.C.
Bidirectional: ±0.10 in.W.C. to ±50.00 in.W.C.
NEMA 1; ABS enclosure
Mounting: surface mount
Output signal: current or voltage
Process Applications of Alpha 166 cost effective pressure transducer:
HVAC and VAV Control
Clean Room and Isolation Rooms
Duct Static Pressure Measurement
Draft Control and Fume Hood Control
Furnace Air Flow Control
Power Plant Air Flow Monitor and Control

Model 161 Cost-effective Differential Pressure Transducer(2020年11月10日)

alphainstruments — 2020-11-10T16:33:24+0900

https://www.alphainstruments.com/product/model-161-differential-pressure-transmitter/

The low cost pressure transducer(low cost pressure transmitter) Model 161 Series are low range differential pressure transducers and transmitters. Each unit features a stainless steel pressure sensor, a stainless steel back cover and a plastic enclosure, which meets the NEMA 1 requirement. The electrical terminal screws and adjustment holes are concealed beneath a detachable plastic cap. All units are fully protected against short circuiting and incorrect wiring.

The Model 161 Series pressure sensors are available for full scale pressure range from 0 to 0.1″WC till 0 to 100″WC. Both unidirectional and bidirectional pressure ranges are offered.The output of the Model 161 Pressure Transducer is available in two versions: 0 to 5VDC and 0 to 10VDC, where 0VDC is true zero without offset. The output of Model 161 Pressure Transmitters is 4 to 20 mA. All units are temperature compensated. The accuracy can be 0.6%, 0.4% or 0.25% at room temperature.

The patented variable capacitance pressure sensor is constructed by stainless steel and glass, no glue or other organics. That provides excellent performance, corrosion resistance and long-term stability.

Additionally, our unique production setup allows us to accommodate special orders for nonstandard pressure ranges (e.g. -0.5″WC to +3.5″WC).

Key Features of Alpha 161 pressure sensor:
Up to 15 PSI Proof Pressure on all Ranges
Miswiring Full Protection
Unsymmetrical Bidirectional Pressure Ranges
True Zero Output for Voltage Unit
Specification of Alpha 161 pressure transmitter:
Accuracy: ±0.25%, ±0.40% or ±0.60% of span
Differential Pressure Ranges:
Unidirectional: 0.10 in.W.C. to 100.00 in.W.C.
Bidirectional: ±0.10 in.W.C. to ±50.00 in.W.C.
NEMA 1; ABS enclosure
Mounting: surface mount
Output signal: current or voltage
Process Applications of Alpha 161 pressure transducer:
HVAC and VAV Control
Clean Room and Isolation Rooms
Duct Static Pressure Measurement
Draft Control and Fume Hood Control
Furnace Air Flow Control
Power Plant Air Flow Monitor and Control

VARIABLE AIR VOLUME (VAV) PRESSURE TRANSMITTER(2020年11月10日)

alphainstruments — 2020-11-10T16:32:38+0900

https://www.alphainstruments.com/variable-air-volume/

Variable air volume (VAV) systems are an effective solution for reducing both the first cost and operating costs for a building owner. Maintaining proper outside air dilution rates, air motion and air distribution becomes the challenge for the VAV system designer.

VAV control is necessary to ensure air flow in large shopping malls, underground places and smart buildings. Too much air will waste electricity, too little air will affect people’s breathing comfort. Therefore, it is necessary to control the air volume by monitoring the wind pressure.

Volume (VAV) configuration the temperature is maintained by varying the temperature of the air volume of air flowing into the room, rather than the temperature of the air. In this case, our Alpha Instruments air differential pressure transmitter are used to measure the volume of air, and would be specified with a range of around 0 to 360 Pa. The feedback provided by the VAV pressure sensor or VAV air flow sensor allows the building control system to open or close dampers, allowing more or less air to flow into a room.

DUCT STATIC PRESSURE TRANSMITTER /TRANSDUCER(2020年11月10日)

alphainstruments — 2020-11-10T16:31:34+0900

https://www.alphainstruments.com/duct-static-pressure/

Duct static pressure transmitter play an important role in transporting natural gas through the thousands of natural gas pipelines. For monitoring the pressure of natural gas. Measure very low inlet and output pressure. Where there is the potential for natural gas to be present in the local atmosphere, special approval options such as ATEX intrinsic safety are available.

If the air pressure in natural gas and gas pipes is too high, there may be leakage or even explosion. If the air pressure is too low, it will affect people’s daily use. Therefore, it is necessary to monitor the pressure of each node through the duct static pressure transducer/transmitter/sensor to make the pressure in a reasonable range.

AIR FILTER DIFFCERENTIAL PRESSURE SENSOR(2020年11月10日)

alphainstruments — 2020-11-10T16:30:26+0900

https://www.alphainstruments.com/central-air-conditioning-filter/

The air filter is a critical part of any HVAC system, and it needs to operate efficiently at all times. By using a air filter differential pressure sensor(hvac differential pressure sensor) to measure the differential pressure across a filter on both sides, the building automation system can monitor the airflow at all times.

As airflow reduces over time it may indicate the filter needs replacing or cleaning. If it isn’t replaced, the system may need to use more energy to restore the airflow to required levels, which also places additional wear on other components in the system.

With the increase of the operating time of the air conditioner, dust will be attached to the filter screen, which will affect the air permeability of the filter screen, thereby reducing the work efficiency of the air conditioner. Therefore, in order to ensure a good operating condition of the air conditioner, the differential pressure between the inside and outside of the air filter screen can be monitored in real time to remind the personnel of the ventilation state of the air conditioner filter screen and whether it should be maintained.

LOW DIFFERENTIAL PRESSURE TRANSDUCERS/TRANSMITTERS(2020年11月10日)

alphainstruments — 2020-11-10T16:29:41+0900

https://www.alphainstruments.com/low-differential-pressure-transducers-transmitters/

Alpha very low differential pressure transducer & transmitters sensors are constructed by stainless steeland glass, no glue or other organics. That provides excellent performance, corrosion resistance and long-term stability.
Our low pressure transmitters/transducers cover the pressure range of 0.1 inch H2O to 100 inch H2O, or 25 Pa to 25000 Pa. With our unique manufacturing techniques, we can readily produce low differential pressure transducer with custom pressure ranges and make use of them in very low pressure measurement or ultra low differential pressure measurement.
Alpha has the product to meet a breadth of HVAC applications and can be trusted in your most critical applications.
Model 161 Cost-effective Differential Pressure Transducer
The Model 161 differential pressure transducer provide excellent sensitivity and long term stability, assuring precise measurement and control at extremely low differential pressures.
AccuracyOutputRangeList Price Starting At
0.25%, 0.4%, 0.6% of span4-20mA,0-5VDC, 0-10VDCUnidirectional: 0.10 in.W.C. to 100.00 in.W.C.(or 25 Pa to 25000 Pa)
Bidirectional: ±0.10 in.W.C. to ±50.00 in.W.C.(or ±10 Pa to ±10000 Pa）$170.00
Model 164 Stainless Steel Differential Pressure Transducer
The Model 164 differential pressure transducer provide excellent sensitivity and long term stability, assuring precise measurement and control at extremely low differential pressures.
AccuracyOutputRangeList Price Starting At
0.25%, 0.4%, 0.6% of span4-20mA,0-5VDC, 0-10VDCUnidirectional: 0.10 in.W.C. to 100.00 in.W.C.(or 25 Pa to 25000 Pa)
Bidirectional: ±0.10 in.W.C. to ±50.00 in.W.C.(or ±10 Pa to ±10000 Pa）$225.00
Model 165 Stainless Steel Differential Pressure Transducer
The Model 165 differential pressure transducer provide excellent sensitivity and long term stability, assuring precise measurement and control at extremely low differential pressures.

AccuracyOutputRangeList Price Starting At
0.25%, 0.4%, 0.6% of span4-20mA,0-5VDC, 0-10VDCUnidirectional: 0.10 in.W.C. to 100.00 in.W.C.(or 25 Pa to 25000 Pa)
Bidirectional: ±0.10 in.W.C. to ±50.00 in.W.C.(or ±10 Pa to ±10000 Pa）$225.00
Model 166 Cost-effective Differential Pressure Transducer
The Model 166 differential pressure transducer provide excellent sensitivity and long term stability, assuring precise measurement and control at extremely low differential pressures.
AccuracyOutputRangeList Price Starting At
0.25%, 0.4%, 0.6% of span4-20mA,0-5VDC, 0-10VDCUnidirectional: 0.10 in.W.C. to 100.00 in.W.C.(or 25 Pa to 25000 Pa)
Bidirectional: ±0.10 in.W.C. to ±50.00 in.W.C.(or ±10 Pa to ±10000 Pa）$185.00
Model 167 DIN Rail Mount Differential Pressure Transducer
The Model 167 differential pressure transducer provide excellent sensitivity and long term stability, assuring precise measurement and control at extremely low differential pressures.
AccuracyOutputRangeList Price Starting At
0.25%, 0.4%, 0.6% of span4-20mA,0-5VDC, 0-10VDCUnidirectional: 0.10 in.W.C. to 100.00 in.W.C.(or 25 Pa to 25000 Pa)
Bidirectional: ±0.10 in.W.C. to ±50.00 in.W.C.(or ±10 Pa to ±10000 Pa）$260.00
Model 168 intrinsically safe Differential Pressure Transducer
The Model 168 differential pressure transducer provide excellent sensitivity and long term stability, assuring precise measurement and control at extremely low differential pressures.
AccuracyOutputRangeList Price Starting At
0.25%, 0.4%, 0.6% of span4-20mA,0-5VDC, 0-10VDCUnidirectional: 0.10 in.W.C. to 100.00 in.W.C.(or 25 Pa to 25000 Pa)
Bidirectional: ±0.10 in.W.C. to ±50.00 in.W.C.(or ±10 Pa to ±10000 Pa）$300.00
Model 175 Push Button Zero Differential Pressure Transducer
The Model 175 differential pressure transducer provide excellent sensitivity and long term stability, assuring precise measurement and control at extremely low differential pressures.
AccuracyOutputRangeList Price Starting At
0.25%, 0.4%, 0.6% of span4-20mA,0-5VDC, 0-10VDCUnidirectional: 0.10 in.W.C. to 100.00 in.W.C.(or 25 Pa to 25000 Pa)
Bidirectional: ±0.10 in.W.C. to ±50.00 in.W.C.(or ±12.5 Pa to ±12500 Pa）$335.00
Model 178 LCD Display Differential Pressure Transmitter
The Model 178 differential pressure transmitter provide digital display, excellent sensitivity and long term stability, assuring precise measurement and control at extremely low differential pressures.
AccuracyOutputRangeList Price Starting At
0.25%, 0.4%, 0.6% of span4-20mAUnidirectional: 0.10 in.W.C. to 100.00 in.W.C.(or 25 Pa to 25000 Pa)
Bidirectional: ±0.10 in.W.C. to ±50.00 in.W.C.(or ±10 Pa to ±10000 Pa）$420.00
Model 178A Front Panel Mounting Differential Pressure Transmitter
The Model 178A differential pressure transmitter provide digital display, excellent sensitivity and long term stability, assuring precise measurement and control at extremely low differential pressures.
AccuracyOutputRangeList Price Starting At
0.25%, 0.4%, 0.6% of span4-20mAUnidirectional: 0.10 in.W.C. to 100.00 in.W.C.(or 25 Pa to 25000 Pa)
Bidirectional: ±0.10 in.W.C. to ±50.00 in.W.C.(or ±10 Pa to ±10000 Pa）$420.00

HVAC/R Pressure Sensors(2020年11月10日)

alphainstruments — 2020-11-10T16:29:02+0900

https://www.alphainstruments.com/hvac-r/

In this pandemic world more than ever, we need efficient HVAC systems.
Effective HVAC differential pressure(DPT sensor hvac) sensors make or break the air quality that a good HVAC system can put out.
Whether you aim to improve comfort, manage maintenance within a building, minimize mold, or monitor pressure in a critical space, Alpha Instruments low pressure transducer HVAC gets the job done.
Alpha Instruments HVAC air pressure sensor, or hvac differential pressure transmitter(DPT) sensor HVAC covers a huge range of HVAC applications, no matter the environment. Our ultra-low-pressure sensor technology works for a variety of applications, from static, flow and differential pressure measurements, accuracy and reliability are the hallmark of the Alpha instruments brand.

DIFFERENTIAL PRESSURE SENSOR FOR CLEAN ROOM PRESSURE MONITORING(2020年11月10日)

alphainstruments — 2020-11-10T16:28:08+0900

https://www.alphainstruments.com/critical-environments/clean-room/

Differential pressure sensor for clean room pressure monitoring
Most semiconductor clean workshops and pharmaceutical preparation workshops should reach the cleanliness level of 100, and the cleanliness level of the operating room should be 1000. An important condition to maintain environmental cleanliness is to maintain a certain differential pressure between the operating environment and the isolation layer.
In order to prevent the fine dust outside the clean room, a differential pressure of about 15pa should be maintained between the clean room and the isolation layer. That is to say, differential pressure limit for clean rooms or clean room pressure differential standard is 15pa. The clean room is the positive pressure end and the isolation layer is the negative pressure end. Due to the leakage and the opening of the inlet and other factors, the pressure of the clean room will be reduced. Alpha’s micro differential pressure clean room sensor can do continuous clean room environmental pressure monitoring and detect this change, and feed the signal back to the control center, and start the booster fan to boost the clean room.

DIFFERENTIAL PRESSURE SENSOR FOR NEGATIVE PRESSURE AMBULANCE(2020年11月10日)

alphainstruments — 2020-11-10T16:27:30+0900

https://www.alphainstruments.com/critical-environments/ambulance/

For the negative pressure ambulance, one of the core technology is differential pressure measuring instrument, called differential pressure sensor. The demand of the Ministry of Health for negative pressure ambulances: 20 times air change per hour, a negative pressure value between 10Pa to -38Pa. We alpha instruments Inc. is such company with strong ability on the technology. Response to battle with COVID-19, we try our best to support to provide the capacitive pressure sensor to ambulance manufacturers.

Critical Environments Pressure Monitors(2020年11月10日)

alphainstruments — 2020-11-10T16:26:59+0900

https://www.alphainstruments.com/critical-environments/

Critical Environments are spaces within a building where highly controlled processes take place. These are typically room conditions where safety of personnel and the protection of assets is essential. The room pressure for critical environments is crucial.
One of the most important decision that mechanical designers, engineers, and architects can make is the selection of a low-differential pressure transducer for critical-care ventilation. It can be used as a room differential pressure sensor and environmental chamber condition monitor.