The term ?dissipation loss? are Worthwhile in the data sheet for a pressure sensor or pressure transmitter. One needs this specification in order to be able to protect the pressure sensor from overheating.
If a pressure sensor is operated in a hot environment, it might be 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 correct electrical connection be managed?
Determination of the correct electrical connection on the basis of the dissipation loss
First, the maximum permissible electrical power for the pressure sensor must be known. That is given in the data sheet as the dissipation loss. Please be aware 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 occurring can 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 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 compared to the permissible dissipation loss. If this is actually the case, both the power (UVoltage source) and the strain (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 won’t heat too strongly and will withstand the mandatory operating temperatures.
Note
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