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er. The small openings of the calibration adapter serve as gas outlet. It might be
necessary for toxic gases to lead the test gas safely away via a connected hose
pipe. Please ensure that the flow resistance remains low enough to avoid a pressure
build-up inside the adapter.
Now apply zero gas and test gas one after another. Duration and flow rate for your
transmitter as per Data Sheet ( DB). Please keep an eye on the start-up phase of
the measuring signal. A stable value should appear till the end of the particular test
gas application. Read then the measured value out of the display of the control unit
or by measuring the 4-20 mA Signal.
The 4-20 mA Signal could also be converted into the measured value acc. to the
following formula:
Measured
Value
For some transmitters calibration is not performed with the proper measured gas
but with replacement test gases. In this case please take the remarks for conver-
sion on the Transmitter Test Certificate into consideration.
Before using replacement test gases please contact ExTox definitely.
It is only then necessary to do an adjustment when the defined tolerances are ex-
ceeded. The tolerances depend on your own specifications or might be determined
by mandatory regulations such as for example official approbations.
Should you require assistance to determine these tolerances, please do not hesitate
to contact ExTox.
Performance of Adjustment
6.5.2
ExSens-I and Sens-I (with RS 485-Communication)
6.5.2.1
Adjustment of the transmitters is done via PC-Software ComSens ( ComSens). You
only need a suitable interface converter for using the RS 485-interface with your
PC. Suitable converters are available in the ExTox delivery programme (see Chapter
8). The interface converter can on the one hand be connected to the clamps inside
the transmitter or on the other hand if correspondingly wired at the clamps of the
control unit.
Please pay also attention to the remarks for calibration in Chapter 6.5.1 when per-
forming the adjustment.
Adjustment for ExSens and Sens can also be done without RS 485-Communication
as per description in Chapter 6.5.2.2. But the drift values evaluated by the Soft-
ware ComSens will be invalid. To make such intervention visible, the potentiometer
for zero point and sensitivity adjustment are sealed with lacquer on delivery of the
types ExSens-I and Sens-I.
ExSens and Sens (without RS 485-Communication)
6.5.2.2
Adjustment is done via potentiometer on the electronic PCBs inside the housing. In
both Transmitter Series the housing can be opened by removing the cover. If the
transmitter is mounted in hazardous areas please follow the instructions in Chapter
0.
Page 18 of 20
Measured
Current
16
mA
ExTox Transmitter ExSens(-I) and Sens(-I)
4
mA
Upper
Limit
Value
Instruction Manual
of
Measuring
Range
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