Infrared temperature sensors from Calex Electronics have been used
with success for over 7 years by a leading provider of packaged gas
for measuring the temperature of gas cylinders as they are filled.
When a gas cylinder is filled and the pressure increases, the cylinder
will warm up. The temperature of the surface is monitored for several
• The target pressure is compensated so the amount of gas filled is
corrected at a standard temperature, typically 15ºC.
• The temperature is monitored as the cylinder valves are opened. If
the valve is opened correctly a drop in pressure and therefore
temperature is observed before rising again as the cylinder is filled. If
the temperature drop is not detected then filling is stopped as there
could be a problem in opening the valve.
• If multiple cylinders are filled simultaneously, the highest and lowest
filling temperatures of the batch are monitored and if the difference
between these two temperatures is too great, filling can be stopped.
To see the full application note download the brochure under "downloads"