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Installation & User Manual
Ed 19UK June 2013
Page 24 of 28
Recalibrating the Absolute Transmitter using Test Cup type G022S100
When recalibrating the MAS2600 Absolute Transmitter a pressure calibrator with a range of
-1 to 3.5 bar should be used. It should have an accuracy of 0.05% FS or better, as well as a 4½
digit milliampmeter. If a calibrator without reference transmitter is used, the atmospheric pressure
must be known to calculate the correction.
Atmospheric pressure and Transducer range to be entered into the formulas as mbar.
1. The calibrator with the output selector switch set to pressure mode is connected to the
MAS2600 transmitter via a Test Cup, type G022S100.
2. Check the transducer range.
The transducer range is indicated on the lid inside the amplifier box.
3. Calculate output signal in conditions of no pressure (atmospheric pressure), using below
formula. The output signal should be adjusted to the calculated value on the zero
potentiometer.
mA @ Atmospheric pressure =
4
16 800
800
+
−
−
*( . )
.
Atm press
Trd range
4. Calculate the pressure for maximum output signal, using the following formula.
mbarg @ 20 mA =
Trd range Atm press. .−
Increase the pressure to calculated pressure and adjust the output signal to 20.00 mA on the
span potentiometer.
5. Remove the pressure and check the zero point.
6. Check the linearity at 0-25-50-75 and 100% of the measuring range.
Output signal at different pressures P can be calculated, using the following formula.
mA @ P mbarg =
4
16 800
800
+
− +
−
*( . )
.
Atm press P
Trd range
7. If necessary, repeat the steps 3 to 6.