Pepperl+Fuchs 1011 Series Installation And Operation Manual page 16

Model 1011 Installation and Operation Manual
Problem or Fault
Enclosure pressure control
regulator will not hold a safe
pressure.
Enclosure pressure indicator
reading is difficult to stabilize.
Enclosure pressure indicator
"drifts" up or down from the
"safe" pressure setting.
Enclosure pressure loss
alarm switch does not appear
to be operating.
Problems persists, or if the
system does not appear to
be operating properly.
This section covers the most common problems documented with this system. Any problems not covered in this section should be
addressed directly to our factory. Please address all service needs to:
Pepperl+Fuchs, Inc.
Customer Service Department
16
Troubleshooting Procedures
Possible Causes
Leakage around gasketing, covers,
seams, piping and tubing connections,
conduit connections and electrical
conduit seals of the enclosure.
Insufficient enclosure leakage or opening
of the venturi orifice is crimped too small.
Application involves a small, tightly sealed
enclosure and/or a fluctuating protective
gas supply.
Pressure switch is out of calibration.
Problems persist
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.
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.
Pre-regulate the protective gas supply upstream of
the enclosure protection system to 5 psi maximum.
For dramatic fluctuations in the protective gas
supply, it may be neccessary to utilize a self-relieving
low flow precision regulator to pre-regulate the
protective gas supply.
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)
Contact Pepperl+Fuchs Applications/Customer
Service Department at (330) 486-0002 for more
information.