The term ?dissipation loss? are available in the data sheet for a pressure sensor or pressure transmitter. One needs this specification to become able to protect the pressure sensor from overheating.
In case a pressure sensor is operated in a hot environment, it usually is necessary 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. So how can the right electrical connection be managed?
Determination of the right electrical connection on the basis of the dissipation loss
First, the maximum permissible electrical energy for the pressure sensor should be known. This is given in the data sheet as the dissipation loss. Please note that the dissipation loss could be dependent upon the utmost expected operating temperature of the instrument and should be calculated where necessary.
If Pitfall 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 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 energy 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 energy of the pressure sensor will 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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