Constant Pressure Cylinder
30.
Open the pre-charge supply to the constant pressure cylinder. Check for leaks and repair as necessary.
If process gas will be used to pre-charge the constant pressure cylinder, slowly open sample pump isolation valve D (
Figure 2
).
If the optional auxiliary instrument air supply will be used to pre-charge the constant pressure cylinder, slowly open the supply
to the constant pressure cylinder.
31.
Slowly open the pre-charge valve on the constant pressure cylinder. This supplies pre-charge pressure to the constant
pressure cylinder and forces the constant pressure cylinder piston to the product side of the cylinder.
32.
Open the product inlet valve on the constant pressure cylinder.
33.
Open the process connection to the constant pressure cylinder. Check for leaks between the pipeline and the constant
pressure cylinder and repair as necessary.
If the GSS-4PM is equipped with a standard probe, slowly open sample pump isolation valve D (
Figure 2
).
If the GSS-4PM is equipped with the optional LE-2SSKO, slowly open inlet (P₁) valve A and return (P₂) valve B (
Figure 3
).
34.
Purge the tubing between the GSS-4PM and the constant pressure cylinder.
If the constant pressure cylinder is equipped with a purge valve, open the purge valve for approximately three to five (3–5)
seconds to purge the tubing, and then close the purge valve. Welker recommends plugging the purge valve when not in use.
If the constant pressure cylinder is not equipped with a purge valve, the tube fitting at the product inlet of the constant
pressure cylinder may be cracked. However, Welker recommends installing a tee with a valve between the sample outlet on the
GSS-4PM and the product inlet on the constant pressure cylinder to enable the tubing to be purged.
17
IOM-022
MODEL: GSS-4PM
REV: F
13839 West Bellfort Street, Sugar Land, TX 77498
welker.com
Service Department 281.491.2331
