The term ? Helplessness ? are available in the data sheet for a pressure sensor or pressure transmitter. One needs this specification to become in a position to protect the pressure sensor from overheating.
If 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 and with this, in the worst case, a total failure of the instrument. So how can the right 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. This is given in the info sheet because 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 your actual maximum electrical energy for the pressure sensor that occurs 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 following equation:
PPressure transmitter = UPressure transmitter � Imax. Current supply
The maximum electrical energy for the pressure transmitter (PPressure transmitter), which is now known, should be smaller compared to the permissible dissipation loss. If this is actually the case, both the power supply (UVoltage source) and the load (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 won’t heat too strongly and can withstand the required operating temperatures.
Note
Should you need any advice, your contact will gladly assist you to.