Quick Reference Instruction Manual
Installation
Insulation and heat tracing
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IM01U10A00-00EN-R, 2nd edition, 2017-08-29
6.3 Insulation and heat tracing
6.3.1 Heat tracing
The majority of applications do not require or provide insulation or trace heating for the
sensor. Product versions with insulation and/or heat tracing are available for specific
technical applications, see applicable General Specifications. Starting with medium tem-
peratures of approx. 80 °C above or below the ambient temperature, insulating the sen-
sor is recommended if the goal is to maintain utmost accuracy. These measures are also
sensible with increased requirements for medium temperature stability.
The sensor is heated by means of heat tracing via a heat transfer medium running
through stainless steel pipes. The heat transfer medium is supplied through process
connections that can be selected. The operator is responsible for temperature control of
the heat carrier. Here the specifications for pressure and the temperature of the heat
transfer medium must be met, see applicable General Specifications.
Heat tracing is only available for the remote type of flow meter and must be selected by
including an appropriate device option when placing the order, see applicable General
Specifications.
WARNING
Risk of overheating the transmitter due to increased ambient temperature
Failure of measuring electronics
▶ Observe the maximum allowable ambient temperature for the transmitter.
▶ Install the transmitter at a sufficient distance from heat sources.
6.3.2 Customer-supplied insulation
For insulation provided by the customer it is important to select a sensor with the appro-
priate design (remote type, sensor with long neck). The space between upper insulation
edge and lower edge of the sensor's terminal box must be at least 40 mm.
Recommended insulation thickness is 80 mm and recommended heat transfer coefficient
0.4 W/m² K.
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