3.4.5 Temperature measuring devices

Temperature measuring devices with an appropriate range shall be installed at the inlet and outlet of the prover. These devices shall be immersed in the liquid to enable an accurate determination of the liquid temperature. The use of thermo-wells (tubular fittings used to protect the temperature sensors) is normally recommended. The accuracy and range of the devices shall be such that the provisions of 3.3 and 5.3 are met.