14 best pneumatic thermostats

Pneumatic thermostats are a type of control device used in various industrial and HVAC (Heating, Ventilation, and Air Conditioning) systems.These thermostats are specifically designed to regulate temperature by utilizing compressed air or gas pressure to control valves and other devices in the system. Here's what you need to know about pneumatic thermostats:

Operating Principle: Pneumatic thermostats operate on the principle of expanding and contracting gases in response to temperature changes. When the temperature in the controlled environment deviates from the set point, the gas pressure in the thermostat changes, leading to adjustments in the controlled devices.
Components: A typical pneumatic thermostat consists of several key components, including a sensing element, a controller, and an actuator. The sensing element detects the temperature and sends a pneumatic signal to the controller. The controller then modulates the pneumatic signal and sends it to the actuator, which adjusts valves, dampers, or other equipment to maintain the desired temperature.
Temperature Range: Pneumatic thermostats are capable of regulating temperatures across a wide range, making them suitable for various industrial and HVAC applications. They can be found in both heating and cooling systems.
Advantages:
- Durability: Pneumatic thermostats are known for their durability and reliability, making them suitable for harsh industrial environments.
- No Electrical Power Required: They don't rely on electrical power for operation, which can be advantageous in certain settings where electrical systems may not be practical or safe.
Disadvantages:
- Limited Control: Pneumatic thermostats may offer less precise control compared to digital or electronic thermostats.
- Maintenance: These systems require occasional maintenance to ensure accurate temperature regulation, including checking for leaks in the pneumatic tubing and ensuring the sensing element is functioning correctly.
Applications:
- Industrial Processes: Pneumatic thermostats are used in various industrial processes to control temperatures in manufacturing, refining, and chemical industries.
- HVAC Systems: They are also found in HVAC systems, particularly in older buildings where pneumatic control systems are installed.
Integration: Pneumatic thermostats can be part of larger control systems, allowing for integration with other control devices and sensors to maintain optimal conditions within a facility.
Calibration: Calibration is essential to ensure the pneumatic thermostat accurately responds to temperature changes. This involves setting the set point and adjusting the system to maintain the desired temperature range.

In summary, pneumatic thermostats are control devices that use changes in gas pressure to regulate temperature in industrial and HVAC systems. They are valued for their durability and reliability, particularly in settings where electrical systems may not be suitable. While they may offer less precision than some digital thermostats, they continue to serve a critical role in various industrial and HVAC applications.

Below you can find our editor's choice of the best pneumatic thermostats on the market

2212-118 TWO PIPE D.A. PNEUMATIC THERMOSTAT

Schneider Electric

Check latest price

Product description

2212-118 TWO PIPE D.A. PNEUMATIC THERMOSTAT

Siemens 192-840 Pneumatic Thermostat, Direct Acting, 3.375" Height, 2.125" Width, 1.62" Length, 3 to 15 psi

SIEMENS

Check latest price

Product description

The Siemens 192-840 power star retro line retro STAT Pneumatic room thermostat converts most existing Pneumatic room thermostats to a power star 192 direct, 2-pipe, single set point unit. The day/Night or heat/cool retro STAT is factory-calibrated to match the appropriate changeover pressure of the competitive thermostat. made in United States. Manufactured by Siemens industry, Inc.

Honeywell TP970A2145 Pneumatic Thermostat, Direct Acting, 2 Pipes, 60 F

Honeywell

Check latest price

Product description

Pneumatic thermostat gives comparable control of pneumatic valves and damper actuators in heating & air conditioning systems. Replacement kits available for Johnson, Powers, Roberts haw, Barber-Colman, and past Honeywell 2-pipe pneumatic thermostats.

Siemens 192-203 Pneumatic Thermostat, Reverse Acting, 3.375" Height, 2.125" Width, 1.62" Length, 3 to 15 psi

SIEMENS

Check latest price

Product description

The Siemens TH 192 S Thermostat is a proportional single output, single set point, 2-pipe (high air capacity) sensor controller. It includes a wall mounting plate for installation in a variety of rough in terminal boxes. A sensitive bimetal responds to temperature change to modulate control air through a flapper nozzle. One set point dial (Fahrenheit scale) is provided. Mounting screws are included. This thermostat is a temperature sensing device that controls pneumatic valve and damper actuators in heating and cooling applications such as air conditioners, space heaters, unit ventilators and air volume controllers. The thermostat maintains energy management (maximum economy) and occupant comfort. The cover is designed to expose the set point adjustment dial.