Operator's manual User Manual

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