Figure 3 Function Schema Of Option 3/2-Way Ball Valve /3Va - M&C SP Series Instruction Manual

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.
Ball valve position
Measuring
Ball valve position
Blow back
Ball valve position
Test gas
Function schema of option 3/2-way ball valve /3VA
Figure 3
For back-purge, a back-purge gas suitable for the sampling point must be
selected. At sampling points with inerting, the back-purging must be performed
with the appropriate inert gas. It is essential to prevent oxygen and flammable
gases from being introduced into the system by the inert gas.
The back-purge pressure and test gas pressure must always be higher than the
process pressure. This minimum pressure must be monitored on the inlet side
with a pressure switch. If the purging gas pressure drops below the process
Warning
pressure, the ball valve must not be operated.
The permissible maximum pressures of 6 bar abs. must not be exceeded (see
chapter 11 Technical data)
The probes SP3110 with back-purge option or test gas option 3VA must not be
used for gas sampling from zone 0.
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