
M20-3 Mixing System 4 July 2004
Trouble Shooting
Pressure Venting
If the high level shut-off has stopped the flow to the receptacle and the pressure gauge does
not return to "0" psi when the manual valve is opened, use extreme caution in opening the
lid. The valve may be plugged or the gauge may be defective, and the receptacle may still be
pressurized.
•If pressure escapes from the receptacle, the manual vent valve is faulty and must be
replaced.
•If there is no noticeable pressure escape, the pressure gauge is faulty and must be
replaced.
Plugging
If the sample from the pipeline is not accumulating in the receptacle, check the following
areas for possible plugging.
•Sample Probe. If there is no sample discharge when the fill line is removed from the
sample probe, remove the probe and clean it. Refer to the repair procedure for the
appropriate sample probe.
•Fill Line. If there is no sample discharge when the fill line is disconnected from the
quick disconnect coupling, remove the fill line from the sample probe. If there is
sample discharge at this point, the fill line is plugged; take steps to clean or replace it.
•Sample Inlet Nozzle. If there is no sample discharge when the quick disconnect
assembly is removed from the receptacle lid, disconnect the fill line from the
coupling. If there is sample discharge at this point, the sample inlet nozzle (quick
disconnect nose and/or coupling) is plugged; take steps to clean or replace it.
•High Level Shut-Off. Stop the drive motor on the sample probe and open the manual
vent valve to release pressure. Detach the ½ in. quick disconnect nose from the
receptacle lid and unscrew the lid from the tank. Reconnect the ½-in. quick
disconnect nose to the receptacle lid. Start the sample probe drive motor and watch for
sample discharge.
If the sample is not being discharged, remove the quick disconnect coupling, unscrew the
nose from the receptacle lid, and insert the nose back into the quick disconnect coupling. If
sample is discharged from the nose, disassemble the high level shut-off assembly and clean it.