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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
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