The term ?dissipation loss? are available in the info sheet for a pressure sensor or pressure transmitter. One needs this specification in order to be in a position to protect the pressure sensor from overheating.
If a pressure sensor is operated in a hot environment, it can be essential 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 right 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 note that the dissipation loss can be dependent upon the utmost expected operating temperature of the instrument and should be calculated where necessary.
If Startling has been determined correctly, then your actual maximum electrical energy for the pressure sensor occurring could be determined. Introducing 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 energy for the pressure transmitter (PPressure transmitter), that is now known, must be smaller than the permissible dissipation loss. If this is the case, both the power supply (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 will withstand the mandatory operating temperatures.
Note
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