M&C TechGroup SP2400-H Operator's manual - Manual (Page 34)

34 Gas sampling and gas conditioning technology 2-1.1-ME
16.4.1 OPTION DRIVE UNIT 234B FOR THE SOLENOID VALVE UNITS
The drive unit 234B is used for control of the solenoid valves in the solenoid valve units for a clocked
back purging. The unit is mounted on a cap rail inside a GFK protection housing of the solenoid valve
unit and is delivered electrically connected.
16.4.1.1 Function and adjustment of the clock generator K3
The control of the back purge action is made via the electronic clock generator K3
(Typ CT-MXS.22) that is equipped with 2 separate time adjustment possibilities for
the impulse and the pause duration. During the impulse duration, the probe is pack
purged.
In the front of the clock generator are situated the adjustment possibilities for the
time ranges (Range) and the potentiometer for the fine adjustment (Time). Thus,
any back purge and pause durations can be separately adjusted. For the fine ad-
justment (Time) the scale is valid which corresponds to the colour of the time
range adjustment (Range).
Example:
The back purging shall be effected every 12 hours for totally 10 seconds.
Duration of the back purging: 10s
Pause: 12 h
Adjustment „Duration of the back purging“ (10s): Set the potentiometer (Time 2) to
10 (white scale) and the time range (Range 2) to 10s.
Adjustment „Pause“ (12h): Set the time range (Range 1) to 30h and the potenti-
ometer (Time 1) to 12 (orange scale).
16.4.1.2 Function and adjustment of the clock generator K2
Via the clock generator K2 (EZ12TI), the solenoid valve Y2 (figure 15 and 16) for the feeding of back
purge gas is controlled. Here, you can adjust the lengths of the back purge impulses and the pause
durations between the pack purge impulses.
In the front of the clock generator K2 the switch for the time basis T and the multi-
plicator xT1 and xT2 is situated. The duration of the back purging, eg. 1s is set with
xT1and the duration of the pause between the back purge blows is set with xT2, eg
1s.
Example:
Clock time and pause duration: 1s
Adjust the time basis T at 0,5s and the multiplicator xT1 and xT2 at 2.
(2 x 0,5s = 1s)