| Problem or Fault | Possible Causes | Corrective Action |
| Enclosure pressure control regulator will not hold a safe pressure. | Leakage around gasketing, covers, seams, piping and tubing connections, conduit connections and electrical conduit seal of the enclosure. | Tighten enclosure latches: silicone sealant can be applied from inside the protected enclosure where tightening is not feasible. |
| Enclosure pressure indicator reading is difficult to stabilize. | Insufficient enclosure leakage or opening of the venture orifice is crimped too small. | Remove the orifice, cut off crimped end and ream tube, then recrimp and reinstall tube. As tube is shortened, sensitivity decreases allowing easier setpoint on the enclosure. |
| Enclosure Pressure Indicator “Drifts” up or down from the “Safe” pressure setting. | Application involves a small, tightly sealed enclosure and/or a fluctuating protective gas supply. | Pre-regulate gas supply upstream of the enclosure protection system to 5 psi m a x im u m |
| Enclosure pressure loss alarm switch does not appear to be operating. | Pressure switch is out of calibration. | Calibrate by slowly adjusting counterclockwise to decrease setpoint and clockwise to increase setpoint. |
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