5. Installation
PNEG-2174
Sampler - Model GRA
19
System Piping
The pneumatic system was pre-plumbed and tested with the sampler before it left the factory. The final
installation must comply with OSHA Regulations and all other applicable federal, state and local codes
and regulations.
As shown on the certified drawing(s), the solenoid valves and filter/regulator (F/R) were mounted on the
sampler at the factory. The user or installer must pipe the compressed air supply to the F/R. Minimum pipe
size for the air supply to the filter/regulator is 1/2" NPT, reduced to 3/8" NPT at sampler. Larger piping to
the sampler and/or a surge tank located at the sampler, will be required on installations where the
compressed air source is further than 200' from the sampler to prevent excessive drop in air pressure.
InterSystems recommends installing a shut off valve upstream of the filter/regulator. A shut off valve
facilitates maintenance as it allows the sampler’s pneumatic system to be maintained and repaired without
shutting down other equipment supplied from the same air source.
Figure 5A Pneumatic Schematic
Ref #
Description
1
Extend/Retract Cylinder
2
4-Way Directional Solenoid Valve
3
Needle Valves (Speed Control)
4
Filter Regulator
5
Compressed Air “In”
Use only cleaned, pickled, descaled and oiled pipe for air supply lines. Dirt, scale
and debris usually found in standard pipe quickly clogs filter/regulators, valves, etc.
Use only Teflon tape to seal pipe joints. Carefully apply the tape to pipe and fittings
so no fragments enter the system.
