Overview
The core component of the Model 178 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 178 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 178 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 178 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, according to NEMA 4/IP65 standard
★ 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 | ress the zero button to clear zero |
| Pressure medium | Air or other non-conductive gas |
| Shell | Die cast aluminum, NEMA 4/IP65 |
| Weight | 330g |
| Installation | There are two 0.165 "diameter mounting holes in the housing. M4 X 12 pan head screws with washers and nuts are included in both cases, as shown in figure for appearance and dimensions. Stainless steel mounting plates with lugs are optional |
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