Two adjustments
Temperature set point control and proportionality control, the latter calibrated from 5 to 60 °F.
Bimetal sensing element
Pneumatic Temperature Controller
The sensing element responds to temperature and the controller uses a pneumatic signal to regulate the process. No electrical supply is needed in the control loop.
- Temperature range
- −50 to 750 °F
- Proportional band
- 5 to 60 °F
- Supply pressure
- 1.4 kg/cm²
- Output
- 0.2 to 1 kg/cm²
Overview
Temperature control without electricity
The sensing element responds to temperature and the controller uses a pneumatic signal to regulate the process. No electrical supply is needed in the control loop.
The sensor element consists of a bi-metal combination having different thermal expansion coefficients. The inner metal rod expands on a rise in temperature and contracts on a decrease, while the outer tube has a low expansion coefficient. The opposite end of the inner rod pushes against a floating link held concentric with a spring loaded inner valve, tilting the valve plug and changing the output signal.
The orifice in the seat is eccentrically drilled, so rotating the seat moves the orifice with respect to the adjusting screw and regulates the opening against temperature change.
Direct installation
The sensing element is installed directly in the process vessel, with an SS316 thermowell.
No power supply
Runs on a 1.4 kg/cm² air supply, so it suits hazardous and remote installations.
Reverse action
An increase in temperature decreases the output, driving the control valve toward closed.
Specifications
Standard model
| Connection | 3/4" NPT (M) |
|---|---|
| Thermowell MOC | SS 316 |
| Length | 300 mm |
| Service | Oil / water |
| Operating pressure | 20 Bar or kg/cm² |
| Temperature range | −50 to 750 Deg F |
| Proportionality control | Calibrated from 5 to 60 °F |
| Supply pressure | 1.4 kg/cm² |
| Output | 0.2 to 1 kg/cm² |
| Pneumatic connection | 1/4" NPT |
| Action | Reverse (increase in temperature will decrease output) |
Tell us the set point and control valve
Share the temperature range, set point, sensing arrangement and control-valve details. We will confirm the controller and pneumatic output.
- Fluid, specific gravity and concentration
- Flow or level range, and line size
- Operating pressure and temperature
- Material of construction and end connection
- Output, display and area classification