Pneumatic Installation - GE Masoneilan 4700P Maintenance Manual

Pneumatic Installation

NOTE
These positioners are designed to operate only with clean, dry, oil-free, instrument grade air to
ANSI/ASA-57.3 1975 (R1981) or ISA-S7.3-1075 (R1981).
Dew point
Particulate mat-
ter
Oil content
Contaminants
The signal connections of 4700P and 4800P and the output and supply connections of 4700P and
4700E are tapped 1/4" NPT. The output and supply connections of 4800P and 4800E are tapped
.
3/8" NPT There is also an exhaust connection with a plastic square head plug in it. If the action
of the positioner is reversed, 4700P/4800P only, then the supply and exhaust connections must
be interchanged. With reverse action, the Supply gauge must be removed and replaced by a 1/
8" NPT plug installed in the supply connection. Since the new supply connection has no gauge
port, connect the removed Supply gauge to the filter regulator to indicate regulator output pres-
sure.
Figure 11 shows pneumatic connections for both the 4700P/4800P and 4700E/4800E position-
ers. Note that the 4700E/4800E has the Instrument port sealed by a 1/4" NPT Plug. Do not remove
plug or make any other connections to this port.
The use of a filter regulator with a 5 micron filter is recommended for the air supply. Tubing used
for piping between filter regulator, positioner, and actuator should be 1/4" minimum, with 3/8"
used for larger actuators with 4700P/4800E positioner.
CAUTION
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The output and supply connections for the 4700E/P and 4800E/P
are different from those on the 4600A.
At least 18 °F (10 °C) below minimum anticipated ambient tem-
perature
Filtered to below 5 microns
Less than 1 ppm w/w or v/v
Free of all corrosive contaminants and hazardous gases, flam-
mable or toxic
Do not use pipe thread sealant tapes on pneumatic fittings, as it
tends to shred small particles which can cause instrument
malfunction.
The use of soft setting anaerobic hydraulic seal, such as Loctite
Hydraulic Seal 542, is recommended. Follow manufacturer's
instructions.
.
Masoneilan 4700P/E & 4800P/E Positioners Manual =| 31