Industrial pressure sensors
A pressure sensor converts mechanical pressure into an electrical signal (4-20 mA, 0-10 V). Essential in water supply, pneumatics, hydraulics, HVAC.
Types
| Type | Accuracy | Price |
|---|---|---|
| Piezoresistive | ±0.25-0.5% | $50-200 |
| Capacitive | ±0.1-0.25% | $150-500 |
| Strain gauge | ±0.1-0.5% | $80-300 |
| Ceramic | ±0.25% | $100-250 |
Ranges
- 0-6 bar: water supply, pump stations
- 0-25 bar: pneumatics
- 0-100 bar: hydraulics
Working pressure = 60-80% of sensor max.
Outputs
- 4-20 mA: standard. To PLC AI module
- 0-10 V: up to 50 m
- Modbus RTU: digital, into Modbus network
FAQ
For water supply?
0-10 bar, 4-20 mA, 316L. $60-120.
Gauge vs absolute?
Gauge — relative to atmosphere. Absolute — relative to vacuum.
How to verify?
Multimeter: 0 pressure = 4 mA. Full scale = 20 mA.
Service life?
5-10 years. Enemies: water hammer, overpressure.
Multiple sensors to PLC?
Yes. Each to its own AI channel.
Summary
Catalog: pressure sensors. Modules: analog modules.
