M&C TechGroup SP3200 Operator's manual - Manual (Page 11)

2-1.3.9-ME Gas sampling and gas conditioning technology 11
This kind of gas feeding provides the advantage that during backflushing the downstream analyse system is
automatically separated from the probe respectively, the probe is automatically separated from the process
during test gas feeding. For that reason, you need a lower quantity of test gas as no mixture with the process
gas may occur.
For the measuring operation, the ball valve must be put into the central position.
For backflushing, the ball valve must be put into the corresponding position. This means in case of manual
operation to turn the handle from the central position to the left side as far as it will go.
For the test gas feeding, the ball valve must be turned to the right side as far as it will go.
For the measuring operation, return the ball valve into the neutral position.
Fi- gure
3 Function scheme of the option 3/2-way ball valve /3VA
8.8 BALL VALVE DRIVE MS1
The following drives are available:
Pneumatic drive with spring return type MS/ NC or NO
Hereby 2 operating conditions can be realised:
a. Using a shut off ball valve VA the conditions:
"Open=measuring" and "shut".
b. Using a 3/2-way ball valve 3VA either the conditions:
"Open=measuring" and "blow back" or
"Open=measuring" and "test gas feeding"
Type MS-C for test gas feeding and type MS-B for blow back.
When placing the order specify, if the ball valve is
NC, (shut without control air), or
NO, (open without control air). Standard = NC
8.9
OPTION /2X SECOND SAMPLE GAS OUTLET ON THE PROBE
With this option, the probe has got two sample gas outlets ¼“ NPTi.
8.10 OPTION /PT100 ADDITIONAL PT100 WITH TERMINAL BOX FOR EXTERNAL TEMPERATURE CON-
TROL
Additional PT100 (2-conductors) with separate terminal box mounted on the probe.
The screwed cable gland has got a terminal range of 7-12 mm.
Ball valve position
Measuring
Ball valve position
Blow back
Ball valve position
Test gas