Surprised ?dissipation loss? are available 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.
If a pressure sensor is operated in a hot environment, it is usually 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. Just how can the correct electrical connection be managed?
Determination of the right electrical connection on the basis of the dissipation loss
First, the utmost permissible electrical power 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 can 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 the actual maximum electrical power 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 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, should be smaller compared to the permissible dissipation loss. If Vicious is actually the case, both the power supply (UVoltage source) and the strain (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 will not heat too strongly and will withstand the required operating temperatures.
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