Thermometer Gas (TG)

Suitable for: RITTER Drum-type Gas Meters

Filling liquid: Isoamylbenzoat »IAB«

Measuring Range

0 °C to + 60 °C, scale graduation 0.5 °C
0 °C to + 80 °C scale graduation 0.5 °C
15 °C to + 30 °C scale graduation 0.1 °C
0 °C to + 50 °C scale graduation 0.1 °C

RITTER Thermometer Gas for Drum-type Gas-Meters


The Thermometer can be used for measurement of the gas temperature while measuring the gas flow. Among other reasons, this is necessary if the measured and indicated actual volume of gas must be recalculated into the norm volume. The actual volume is the volume at the actual temperature and the actual pressure.

The norm volume of a gas is the volume at norm conditions which are (in Germany):

Norm Temperature = 273,15 Kelvin ( = 0 °C)
Norm Pressure = 1.013,25 mbar

The formula for converting the actual volume into norm volume is:

formel gasgleichung tg

VN = Norm Volume in (ltr)
Vi = Indicated Volume in (ltr)
pN = Norm Pressure in (mbar-absolute)
pa = Actual Pressure in (mbar-absolute)
TN = Norm Temperature in (Kelvin)
Ti = Indicated Temperature in (Kelvin)


Unpack the Thermometer. Unscrew the closing cap of the Thermometer (Gas) support on the Gas Meter. Mount the Thermometer by inserting it carefully through the Thermometer (Gas) support. Seal the Gas Meter’s casing by tightly screwing the union nut which is attached to the Thermometer. Thus, the Thermometer is ready for use. The removed closing cap of the support can be stored easily by screwing it onto the respective thread support located at the base plate of the gas meter.

V 2.0 / Rev. 2022-06-25 / Subject to alterations.