The term ?dissipation loss? are available in the info sheet for a pressure sensor or pressure transmitter. One needs this specification to become able to protect the pressure sensor from overheating.
If a pressure sensor is operated in a hot environment, it is usually necessary to limit its electrical power. If one neglects this aspect, one possibly risks an overheating sufficient reason for this, in the worst case, a total failure of the instrument. Just how can the right electrical connection be managed?
Determination of the correct electrical connection based on the dissipation loss
First, the maximum permissible electrical energy for the pressure sensor should be known. That is given in the info sheet as the dissipation loss. Please be aware that the dissipation loss could be dependent upon the utmost expected operating temperature of the instrument and must be calculated where necessary.
If the allowable dissipation loss has been determined correctly, then your 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 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 next equation:
PPressure transmitter = UPressure transmitter � Imax. Current supply
The maximum electrical energy for the pressure transmitter (PPressure transmitter), that is now known, should 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 can withstand the required operating temperatures.
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