Model 178A

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

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General Description

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.

Features

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

Technical Data

Parameter	Standard	Special selection	Special selection
Accuracy RSS*（under constant temperature）	±1.0%FS	±0.40%FS	±0.25%FS
nonlinearity（best fitting line）	±0.97%FS	±0.37%FS	±0.24%FS
lag	±0.20%FS	±0.10%FS	±0.05%FS
non-repeatability	±0.10%FS	±0.10%FS	±0.05%FS
Temperature effect
Zero point/Full range offset(/℃)	±0.05%FS	±0.03%FS	±0.02%FS
Compensation range	4℃ to 77℃
Maximum static pressure	15PSI(100kPa)
Overload	Both positive and negative are 15PSI(100kPa)
Stability ratio	±0.5% FS/YR
Preheat	5 seconds to reach the performance specification
Installation position effect	When 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 temperature	0℃ to 60℃
Storage temperature	-40℃ to 85℃
Electrical connection	Pluggable terminal with PG-9 cable locking device
Pressure connection	3/16"、φ8、φ6.5 brass tower pressure connection(optional)
Output regulation	Press the zero button to clear zero
Pressure medium	Air or other non-conductive gas
Shell	Die cast Aluminum, SS304 Front panel, NEMA 4/IP65
Weight	508g
Installation	Front panel mounting