14. Troubleshooting Guide
Problem Posssible Causes Suggested Action
No Output Pressure Reversed Current polarity or
faulty connections
Broken internal wiring
No air supply
Check wiring and signal
continuity with milliameter
Check instrument resistance with
ohmmeter. Repair if faulty.
Correct
Maximum output not available Insufficient supply pressure
Damaged coil or nozzle
Oil contamination
Clogged restrictor
Adjust
Return to Factory for Repair
Replace instrument
Replace
Zero will not adjust Worm disengaged with pinion
(after excessive adjustment)
Re-engage components
Zero calibration error on initial
turn-on
A small error is normal Exercise instrument several times
and retest
13. Product Variations
E-P Versions (Voltage Controlled converters)
These are available in the 2 and 3 wire versions. The two wire versions are recalibrated I/P convert-
ers with a suitable buffer resistor in series with the coil to adjust the sensitivity
3 Wire Versions
These are products designed for electrical control signals which differ from the normal 4-20. 0-
60mA signals. An internal amplifier is fitted to translate the control signal into the required current
through the coil. An external 12V-24V DC signal is required to power the amplifier, which should be
capable of providing 25mA (low pressure) or 65mA. (high pressure)
It is essential that wiring be carried out correctly as incorrect wiring may destroy the amplifier
completely.
Control
1
2
3
+
12V –24V
Supply
Common
Captured Exhaust Versions: Designed for use with certain gases. This part must be connected to
a suitable exhaust arrangement e.g. stack pipe. N.B. Check before installation.
Warning: Not for use where no escape of gas is permitted to escape to the environment due to the
constant bleed of the unit
Materials of Construction:
Lid: Nylon 66; Magnet: Permanent Neodymium Iron Boron; Magnet Ironwork: Zinc plated mild steel
Flapper: Beryllium Copper; Nozzle: Brass
1
2
3
+
Control
Common
3 Wire
2 Wire
(297 pages)
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