The term ?dissipation loss? can be found in the info sheet for a pressure sensor or pressure transmitter. One needs this specification to become in a position to protect the pressure sensor from overheating.
In case a pressure sensor is operated in a hot environment, it can be essential to limit its electrical power. If one neglects this aspect, one possibly risks an overheating sufficient reason for this, in the worst case, a complete failure of the instrument. So how can the correct electrical connection be managed?
Determination of the correct electrical connection on the basis of the dissipation loss
First, the maximum permissible electrical energy for the pressure sensor must be known. That is given in the info sheet as the dissipation loss. Please note that Kickstart could 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 your actual maximum electrical power 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 using the following formula:
UPressure transmitter = UVoltage source ? RLoad � Imax. Current supply
2. Calculation of the utmost electrical energy 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), which is now known, must be smaller than the permissible dissipation loss. If this is 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 won’t heat too strongly and will withstand the mandatory operating temperatures.
Note
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