5
– Maintenance
23
Checking the current generator
Although this setting is made in the factory, it is possible that the transmitter and
controller may have to be matched. In this case, proceed as follows:
■
Connect a voltmeter to the AF+ and
AF- terminals (caliber mV/DC)
(Figure 19).
■
Verify that the sensor is located in a
clean-air environment. If not, inject
synthetic air at a flow rate of 60 l/h.
Figure 19
112
■
Wait for the measurement to
stabilize (displayed on screen) and
adjust the zero by using the ZERO
potentiometer
located
on
the
sensor pack (Figure 20, ref. 2).
Figure 20
034
■
The instrument then sends a 4 mA
signal down the line. Connect a
voltmeter to the VI+ and VI-
terminals (caliber mV/DC).
The
multimeter displays 400 mV
■
If some different value is displayed,
adjust P1 (Figure 21, rep. 1).
■
adjustment is complete.
Figure 21
114
Summary of Contents for CTX 300 CO2
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