Purging the Sample Cylinder
Welker recommends that the sample cylinder be cleaned or purged prior to each sample batch to remove any air and/or old
product from the system and prevent cross-contamination between samples.
14.
Purge the sample cylinder using the fill and empty method or the continuous purge method as described in Gas
Processors Association (GPA) Standard 2166-86,
Obtaining Natural Gas Samples for Analysis by Gas Chromatography.
15.
Once the sample cylinder has been purged using the chosen method, ensure that there is no pressure in the sample
cylinder and that the outlet valve on the sample cylinder and purge valve B are closed.
Preparing for Sampling
16.
As necessary, program the Welker 6Tc Timer/Controller (
). Refer to the
Installation, Operation, and Maintenance
(IOM)
Manual
for the 6Tc for instructions on setting the 6Tc.
17.
As necessary, set the PLC to the desired sampling frequency based on the sampling actuation equations provided
(
Figure 10: Gas Sampling Equations
Note that the sample volume of the Essentials™ Gas Sampler is 0.25 cc.
18.
Prior to beginning sampling procedures, ensure that purge valve B is closed and that the sample cylinder is empty.
19.
The Essentials™ Gas Sampler is now operational.
15
IOM-222
MODEL: ESSENTIALS™ GAS SAMPLER
REV: A
13839 West Bellfort Street, Sugar Land, TX 77498
welker.com
Service Department 281.491.2331
