The following equation is used to calculate the temperature error for remote seals:
Where
dp = (212 °F – 68 °F) . 0.077 inH2O/25 °F + (122 °F – 68 °F) . 15 ft . 2 . 0.042 inH2O/25 °F / 3ft + (122 °F – 68 °F) . 0.042 inH2O/25 °F
dp = 0.444 inH2O + 0.907 inH2O + 0.091 inH2O
dp = 1.442 inH2O (corresponds to 3.605 % of set span)
Note:
The temperature error determined above only applies to the error resulting from connection of the remote seal.
The transmission response of the respective transmitter is not included in this consideration. It must be calculated separately, and the resulting error added to the error determined above from connection of the remote seal.
Temperature errors of diaphragm seals when connected to pressure, absolute pressure or level transmitters, and with single-sided connection to differential pressure transmitters
Remarks:
The errors listed in the tables on pages 2/140 and 2/141 refer to the use of stainless steel as the diaphragm material. If a different material is used, the listed values change by the amount shown in the following table.
Source : Siemens
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kindly explain the diaphragm material used in which kind of fluid. ie hydrogen, chlorine, acid, brine, steam/water etc.