19
IOM-222
MODEL: ESSENTIALS™ GAS SAMPLER
REV: A
13839 West Bellfort Street, Sugar Land, TX 77498
welker.com
Service Department 281.491.2331
When sampling into a Welker SC Single Cavity Cylinder, the inline relief must be set to approximately 100 psig above pipeline
pressure.
If the inline relief will be adjusted using pipeline product, continue to step 1.
If the inline relief will be adjusted using an auxiliary gas supply, proceed to step 9.
Figure 11: Inline Relief Adjustment Diagram
Using Pipeline Gas
1.
Close product inlet valve A and depressurize the Essentials™ Gas Sampler (
).
2.
Disconnect tubing from the outlet of the MPS-2.
3.
Open product inlet valve A to pressurize the Essentials™ Gas Sampler (
).
4.
If pressure is leaking past the inline relief, insert an L-shaped hex key through the relief cap, and then turn the spring
adjuster clockwise until no gas bleeds through.
5.
Turn the spring adjuster counterclockwise until some gas bleeds through.
6.
Turn the spring adjuster clockwise until no gas bleeds through, and then turn the spring adjuster clockwise another full
turn.
Ensure that at least half a turn remains on the spring adjuster, as too much tension will prevent the spring from contracting and
releasing when the MPS-2 is actuated. To ensure at least half a turn remains on the spring adjuster, Welker recommends turning
the spring adjuster clockwise and counting each turn until the spring adjuster can no longer be turned; the spring adjuster can
then be turned counterclockwise the appropriate number of turns.
7.
Verify that the outlet pressure gauge reads zero (0) psig. This reading indicates that the inline relief is holding and that
sample cannot flow to the sample cylinder. If the outlet pressure gauge reads partial pressure, the inline relief requires
further adjustment; return to step 4. If the outlet pressure gauges reads pipeline pressure, purge valve B and/or the
inline relief requires maintenance; see
for instructions on maintaining the inline relief.
8.
Reconnect the tubing to the outlet of the MPS-2.
