The term ?dissipation loss? can be found 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 can be essential 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 right electrical connection based on the dissipation loss
First, the maximum permissible electrical power for the pressure sensor should be known. That is given in the info sheet because the dissipation loss. Please note that Alarming could be dependent upon the maximum expected operating temperature of the instrument and must 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 could be determined. The determination can be carried out 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 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, should be smaller compared to the permissible dissipation loss. If this is actually the case, both the power supply (UVoltage source) and the load (RLoad) were properly calculated and the electrical power of the pressure sensor will be within the permissible range under all operating conditions. Consequently, the pressure transmitter will not heat too strongly and will withstand the mandatory operating temperatures.
Note
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