Model 178A Differential Pressure Transmitter

Overview

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.

Feature

★ 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

Datasheet

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