The term ?dissipation loss? are available in the info sheet for a pressure sensor or pressure transmitter. One needs this specification in order to be able to protect the pressure sensor from overheating.
In case a pressure sensor is operated in a hot environment, it really is necessary to limit its electrical energy. If one neglects this aspect, one possibly risks an overheating and with this, in the worst case, a complete failure of the instrument. So how can the right electrical connection be managed?
Determination of the correct electrical connection based on the dissipation loss
First, the utmost permissible electrical power for the pressure sensor must be known. That is given in the info sheet as the dissipation loss. Please be aware that the dissipation loss could be dependent upon the utmost expected operating temperature of the instrument and must be calculated where necessary.
If the allowable dissipation loss has been determined correctly, then your actual maximum electrical power for the pressure sensor occurring could be determined. The determination can be executed expediently in two steps:
1. Determination of the voltage at the pressure transmitter utilizing the following formula:
UPressure transmitter = UVoltage source ? RLoad � Imax. Current supply
2. Calculation of the maximum electrical power for the pressure transmitter through the next equation:
PPressure transmitter = UPressure transmitter � Imax. Current supply
The maximum electrical power for the pressure transmitter (PPressure transmitter), which is now known, should be smaller than the permissible dissipation loss. If this is the case, both the power supply (UVoltage source) and the strain (RLoad) were properly calculated and the electrical power of the pressure sensor will undoubtedly be within the permissible range under all operating conditions. Consequently, the pressure transmitter won’t heat too strongly and will withstand the required operating temperatures.
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