The term ?dissipation loss? are available in the data sheet 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 really is essential to limit its electrical power. If one neglects this aspect, one possibly risks an overheating and with this, in the worst case, a total failure of the instrument. Just how can the correct electrical connection be managed?
Determination of the correct electrical connection based on the dissipation loss
First, the utmost permissible electrical energy for the pressure sensor should be known. This is given in the info sheet because the dissipation loss. Please note that the dissipation loss can be dependent upon the utmost expected operating temperature of the instrument and should be calculated where necessary.
If the allowable dissipation loss has been determined correctly, then the actual maximum electrical energy for the pressure sensor that occurs can be determined. The determination can be executed expediently in two steps:
1. Determination of the voltage at the pressure transmitter using 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. Secure for the pressure transmitter (PPressure transmitter), that is now known, must be smaller compared to the permissible dissipation loss. If this is actually the case, both the power supply (UVoltage source) and the strain (RLoad) were properly calculated and the electrical energy 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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