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The term ?dissipation loss? can be found 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.
In case a pressure sensor is operated in a hot environment, it usually is 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 total failure of the instrument. So how can digital pressure gauge be managed?
ไดอะแฟรม of the correct electrical connection on the basis of the dissipation loss
First, the utmost permissible electrical power for the pressure sensor must be known. This is given in the info sheet because the dissipation loss. Please note that the dissipation loss could be dependent upon the maximum 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 can be determined. The determination can be executed 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 power 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 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 mandatory operating temperatures.
Note
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