Pressure Transimitter

Low Differential Pressure Transmitter/ Transducer

For measuring very small pressure differences between two measurement points either side of a ventilation fan, both sides of an air filter or either side of clean room wall.

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Model 178A Differential 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


The core component of the Model 178A series differential pressure sensor/transmitter is a capacitive pressure sensor, which consists of a stainless steel diaphragm with a fixed electrode forming a capacitor whose value varies with pressure. Using the company's special patented technology carefully designed sensor sensors and unique detection circuit to ensure good temperature performance and long-term stability of the product.

The Model 178A series features SS304 front panels and a one-touch clear button, and the product meets the National Electrical Manufacturers Association (NEMA) Level 4 (IP-65) standard.

The Model 178A differential pressure sensor/transmitter can be used to measure differential or gauge pressure with outputs of 0-5V, 0-10V, 4-20mA, and can also be customized for other outputs. The accuracy of Model 178A was ±1.0%FS, 0.4%FS or 0.25%FS at room temperature. The temperature compensation ranges from 4 ℃ to 77℃, and the temperature effect is less than ±0.05%FS/℃.

Model 178A has excellent performance-price ratio, widely used in HVAC, environmental pollution control, clean engineering, medical instruments and equipment, oven pressurization and furnace pressure control, natural gas, gas pipe network monitoring, underground ventilation and power plant wind pressure monitoring and other fields.


Strong aluminum case, NEMA 4/IP65 compliant

3-1/2 bit LCD display

SS304 Embedded installation

The positive/negative pressure end can withstand at least 100kPa overload without damage

One key zero button

Full protection of misconnection

Environmental protection design, in line with ROHS standards

Minimum pressure range of 10Pa


ParameterStandardSpecial selectionSpecial selection
Accuracy RSS*(under constant temperature)±1.0%FS±0.40%FS±0.25%FS

nonlinearity(best fitting line)

Temperature effect
Zero point/Full range offset(/℃)±0.05%FS±0.03%FS±0.02%FS
Compensation range4℃ to 77℃
Maximum static pressure15PSI(100kPa) 
OverloadBoth positive and negative are 15PSI(100kPa)
Stability ratio±0.5% FS/YR
Preheat5 seconds to reach the performance specification
Installation position effectWhen factory calibration, the sensor is placed vertically. In order to ensure accuracy, necessary fine tuning should be made when installing other positions at zero point

Environmental and mechanical parameters
Operating temperature0℃ to 60℃
Storage temperature-40℃ to 85℃
Electrical connectionPluggable terminal with PG-9 cable locking device
Pressure connection3/16"、φ8、φ6.5 brass tower pressure connection(optional)
Output regulation
Press the zero button to clear zero
Pressure mediumAir or other non-conductive gas
ShellDie cast Aluminum, SS304 Front panel, NEMA 4/IP65
InstallationFront panel mounting

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SENBA Sensing Technology Co.,Ltd., was founded in 2005, with the focus on producing the top quality photoelectric components, such as PIR sensors, Photoresistors,Light Sensors, Flame detectors etc. Our strategic goal is to master the core technology.