M&C TechGroup SP2400-H Operator's manual - Manual (Page 29)

2-1.1-ME Gas sampling and gas conditioning technology 29
16.3 OPTION BALL VALVE DRIVES
For external control of the probe internal ball valves there is the possibility to use a pneumatic drive
with return spring type MS1, MS3 (for 320°C) or an electric drive EA.
16.3.1 OPTION PNEUMATIC DRIVE MS1 OR MS3 WHEN USING A 2/2-WAY BALL
VALVE /VA
Ball valve open = measuring operation
Ball valve closed = e.g. changing filter element at process excess pressure or toxic sample gas or test
gas feeding with option check valve /R without loss of test gas into the process.
Figure 13 Pneumatic drive for 2/2-way ball valve
When placing the order it shall be specified whether the ball valve should be
NC
, without control air closed, or
NO , without control air open and hence switched to measuring.
Standard = NC