M&C TechGroup SP2400-H Operator's manual - Manual (Page 35)

2-1.1-ME Gas sampling and gas conditioning technology 35
16.4.1.3 Function and adjustment of the time delay relay K1
After the back purge action, the time relay K1 (EZ12AV) finishes the message
„Back purge“ with a time delay of eg. 1min and releases the measurement again in
order to have sample gas in the analysers when you switch over from back purging
to measuring.
In the front of the time relay, the switches for the time basis T and the multiplicator
xT are situated.
Example:
Delay time: 1min.
Adjust the time basis T to 1 min. and the multiplicator xT to 1 (1 x 1min. = 1min).
16.4.1.4 Function for ball valve position NC „normally closed“
After actuation of the back purge action by K3 (type CT-MXS.22), the message purging is given via
the time relay K1 (EZ12AV), the control solenoid valve Y1 (see figure 15 and 16) is closed and the ball
valve returns in its rest position by spring return (back purge).
The clock relay K2 (type EZ12TI) is piloted for eg. 10s and switches on and off again the back purge
solenoid valve Y2 in a clock cycle of eg. 1s.
After this, it is pause time in which the solenoid valve Y1 is changed over again to the measuring gas
sampling. At the same time, the time-delay relay is switched which – after a delay time of eg. 1 min. -
finishes the message „purging“ and releases again the measurement. This delay time is necessary in
order to have active sample gas in the analysers during switching over from purging to measuring.
16.4.1.5 Function for ball valve position NO „normally open“
After actuatig the back purge action through K3 (type CT-MXS.22), the message „purging“ appears via
the time relay K1 (EZ12.AV), the control solenoid valve Y1 (see figure 15 and 16) is opened and the
pneumatic drive moves the ball valve into position „back purging“.
The clock relay K2 (type EZ12.TI) is piloted for eg. 10s by K3 and switches on and off again the back
purge solenoid valve Y2 in a clock cycle of eg. 1s.
After this, it is pause time in which the solenoid valve Y1 is changed over again to the measuring gas
sampling. At the same time, the time-delay relay is switched which – after a delay time of eg. 1min. –
finishes the message „purging“ and releases again the measurement. This delay time is necessary in
order to have active sample gas in the analysers during switching over from purging to measuring.