Model 178A Front Panel Mounting Differential Pressure Transmitter

The model 178A Series pressure monitors 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