Enclosure pressure control valve will not hold a safe .25 inch (6.35mm) pressure
Possible Causes
Leakage around gasketing, covers, seams, piping and tubing connections and electrical conduit seals for the enclosure

Corrective Action
Tighten enclosure latches: Where tightening is not feasible, and gasketing materials are not practical, holes or gaps can be closed with silicone sealant applied from inside the protected enclosure

Enclosure pressure control valve will not hold a safe .25 inch (6.4mm) pressure
Possible Causes
Leakage around gasketing, covers, seams, piping and tubing connections and electrical conduit seals for the enclosure

Corrective Action
Tighten enclosure latches: Where tightening is not feasible, and gasketing materials are not practical, holes or gaps can be closed with silicone sealant applied from inside the protected enclosure

Enclosure pressure gauge reading is difficult to stablize
Possible Causes
Insufficient enclosure leakage or opening of the venturi orifice is crimped too small

Corrective Action
Remove the orifice, cut off the crimped end and ream the tube, then recrimp and reinstall the tube to note effect. As tube is shortened, reamed and recrimped, sensitivity decreases, allowing easier adjustment of setpoint on the enclosure pressure gauge

Enclosure pressure loss alarm switch (if utilized) does not appear to be operating
Possible Causes
Pressure switch is out of calibration

Corrective Action
Calibrate by slowly adjusting counterclockwise to decrease the setpoint, and clockwise to raise the setpoint. (Do not attempt to calibrate the switch until all efforts to make the switch respond properly have failed).

Problem persists, or if the system does not appear to be operating properly
Possible Causes
Unknown

Corrective Action
Contact Pepperl+Fuchs Applications / Customer Service Department at 330-486-0002 or sales@us.pepperl-fuchs.com.

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