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Reference Manual MAS2600: Testing and Recalibration
Ed 21 December 2014
38
Testing
Caution! Please observe that testing and recalibration of transmitters mounted in hazardous
areas shall be carried out by Ex qualified personnel.
Before dispatch, the MAS2600 transmitter is calibrated in accordance with the requirements speci-
fied in the order.
The transducer and the amplifier are calibrated together and must, therefore, always be used
together.
A programmable measuring range transmitter will in conditions of no pressure (empty tank) give an
output signal of 4 mA, and in conditions of maximum pressure an output signal of 20 mA.
The transmitter should be tested by applying to the transducer a known pressure from a calibrator
and reading the equivalent milliamp signal on a milliamp meter.
The above-mentioned applies to the gauge transmitter only. For absolute transmitters the output
signal will be higher than 4 mA, because it is calibrated for 4 mA at 0.8 bar abs. The output signal will
typically be 5-7.5 mA in atmospheric pressure, depending on the transducer range and the actual
atmospheric pressure. Maximum output signal 20 mA, will be at the transducers absolute range.