SECTION 4
NO FLOW CHECK PROCEDURE
NO FLOW ZONE Check for air sample tube blockage.
NO FLOW PURGE Check for blockage of purge line. Verify that the purge line does not exceed 100’ in length.
NO FLOW ZONE AND NO FLOW PURGE Check the water trap. If full of water, drain and re-secure the
petcock. If there is no water in the trap, check for a blockage in the exhaust line. Verify that the exhaust line does
not exceed 100’ in length.
NOTE_ Go to the diagnostic screen and view the “PRESS”, “VAC” and “AMB” values. I “PRESS” equals “VAC”;
there is a blockage in the pneumatic system. If “PRESS”, “VAC” and “AMB” are all equal at about 14.0 PSIA then
there is a leak in the pneumatic system.
If “AMB” is below “PRESS”, disconnect the purge line and force a pressure check. If “AMB” is now correct the
problem is in the purge line.
Note – If the unit does not see all zones check the elbow fittings on the water trap. If they are cracked or broken the
monitor may see only 4 zones.
1) – Pinch off the tubing between the water trap and in line filter. Go to the diagnostic screen on the RDM800.
Observe the “PRES”, “VAC” AND “AMB” readings at the bottom of the screen.
a) – If the pressure DOES NOT drop to normal vacuum levels (about 2 PSIA below pressure reading) the
problem is in one of the following;
1) – Tubing from the filter to the “T” connector.
2) - Tubing from the “T” connector to pressure sensor.
3) – Tubing from “T” connector to the I/R bench.
4) – Tubing from I/R bench to the pump.
b) – If the pressure DOES drop to normal vacuum levels then go to the tubing between the solenoid manifold
and the water trap and pinch it closed.
1) – If the pressure DOES NOT drop to the same level as the first reading the problem is in the water
trap.
2) – If the pressure DOES drop to the same reading as the first reading the problem is most likely in
either the tubing around the solenoid manifolds or the solenoids themselves.
Observe “PRES”, “VAC”
and “AMB” readings during
the check procedure
Rev 3/2/09
6
