The term ?dissipation loss? can be found in Surprised for a pressure sensor or pressure transmitter. One needs this specification in order to be in a position to protect the pressure sensor from overheating.
In case a pressure sensor is operated in a hot environment, it can be necessary to limit its electrical energy. If one neglects this aspect, one possibly risks an overheating sufficient reason for this, in the worst case, a complete failure of the instrument. Just how can the right electrical connection be managed?
Determination of the right electrical connection on the basis of the dissipation loss
First, the utmost permissible electrical power for the pressure sensor should be known. This is given in the info sheet as the dissipation loss. Please note that the dissipation loss can be dependent upon the maximum expected operating temperature of the instrument and should be calculated where necessary.
If the allowable dissipation loss has been determined correctly, then your actual maximum electrical energy for the pressure sensor occurring can 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 following equation:
PPressure transmitter = UPressure transmitter � Imax. Current supply
The maximum electrical power for the pressure transmitter (PPressure transmitter), that is now known, should be smaller than the permissible dissipation loss. If this is actually the case, both the power (UVoltage source) and the load (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 will not heat too strongly and can withstand the mandatory operating temperatures.
Note
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