Gas-Filled Thermometers
A gas-filled thermometer transmits the pressure of gas expanding with temperature through a capillary tube to the measuring element in the dial, showing temperature away from the measuring point.
It is used in boiler, cooling and machine applications needing a reading on the panel front. The product range includes Ø40, Ø50, Ø60 and Ø100 mm dial models with back and bottom connection and NC/NO contacts.
Main Applications
- Boiler panel indicators
- Cooling and chiller panels
- Machine and engine temperature
- Oven and dryer applications
- Remote tank temperature reading
- Alarm and control circuits
Technical Data
| Type | Gas-filled (capillary) thermometer |
|---|---|
| Dial sizes | Ø40, Ø50, Ø60, Ø100 mm (product range) |
| Scale | 120 °C, 200 °C, 0–300 °C (product names) |
| Capillary length | 1 m, 2 m (product names; depending on model) |
| Connection | Back or bottom (product range) |
| Contact | NC/NO contact types (product range) |
| Accuracy class | CL 2.0 (product name; depending on model) |
| Mounting | Panel or device housing |
Material Options
| Part | Gas-filled without contact | Gas-filled with contact |
|---|---|---|
| Output | Indicator only | Indicator + NC/NO contact |
| Dial | Ø40 – Ø100 mm | Ø60 – Ø100 mm |
| Capillary | Depending on model | 1 – 3 m (depending on model) |
| Typical use | Panel indicator | Alarm and control |
Which material? The capillary tube must not be sharply bent or crushed; a damaged capillary spoils the reading. Dial, scale and capillary length are taken from product names; other values are confirmed per model.
Advantages
Remote Reading
- Panel mounting via capillary
Contact Option
- Alarm and control
Compact Dial
- From Ø40
Needs No Power
- Mechanical indicator
Construction and Design Features
- Gas-filled bulb
- Capillary tube
- Dial and measuring mechanism
- Contact assembly (contact types)
Send the dial size, scale range, capillary length and contact needs; we will confirm a suitable gas-filled thermometer from stock.
How to Choose?
- Connection and capillaryDetermine mounting place and capillary length needed.
- PressureUse a thermowell for the bulb if needed.
- Temperature rangeChoose a scale suited to working temperature.
- ContactChoose an NC/NO contact type if an alarm is needed.
Complementary Products
Why ORFA?
Other Thermometers
Bimetal Thermometers
Bimetal thermometers show temperature on a dial using the different thermal expansion of two metals.
Details →
Contact Thermometers
Contact thermometers show temperature and also switch an electrical contact at a set value.
Details →
Industrial Machine Thermometers
Industrial machine thermometers are sturdy, sheathed thermometers used to read temperature on pipelines and machines.
Details →Get a quote for your project
Our sales team will prepare the best solution for your needs.