4 | GE Oil & Gas
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Under no circumstances should PTFE tape be used for sealing
the fittings as this tends to shred small particles which may
find their way into the instrument causing malfunctions�
The use of a soft setting anaerobic hydraulic seal is
recommended, (e�g� Loctite Hydraulic Seal 542)� Follow the
manufacturers recommendations�
Do not use an excessive amount as this will not set and could
find its way into the instrument�
If the air supply is not of adequate quality, the device
performance can be affected� Adequate quality can normally
be achieved by the use of air filter regulators�
Electrical Installation
The electrical connections should be made as shown in the
dimensional drawing Figure 1� The instrument is protected
against reverse polarity to –100mA, no operation is possible
in this condition�
The Model 4411 approximates a constant voltage load of 6�5
volts across the loop terminals, therefore it is essential that the
loop controller be capable of providing a constant current in
the range 4-20mA with an output voltage of at least 6�5 volts�
Voltage output controllers (e�g� variable voltage power
supplies) are entirely unsuitable for the Model 4411 and could
severely damage the electronic circuits�
Important Note
The control electronics of the Model 4411 incorporate precision
electronics� The calibration of the unit may be affected by very
high voltage spikes� Consequently, in environments where static
electricity may be present ESD precautions should be used�
Wiring And Cable Entry
These instruments must be installed in accordance with local
and national codes of practice, especially for hazardous
area installations� The instruments are fully isolated from
ground and therefore grounding is unnecessary for functional
purposes� However, grounding may be necessary to conform
to installation codes�
Note: It is strongly recommended that shielded cable or
a grounded conduit be used to achieve maximum RFI
immunity, if the installation has any risk of electromagnetic
interference.
Conduit Entry
The instrument has twin conduit entry threaded 1/2" NPT� For
explosion proof installation, a sealed conduit gland conforming
to explosion-proof specifications must be used� A ground
terminal is provided both internally and externally and should
be used if ground continuity is essential�
The unit is supplied with plastic blanking plugs, which must
be removed before operation/calibration and replaced with a
blanking plug conforming to the hazardous area certification
rating applicable�
Calibration
The instruments are designed for continuous operation
without the necessity for routine overhaul, with continuous
monitoring, adequate precautions and replacement of the
filter no longer than every 5 years�
The most common source of failure for pneumatic
instrumentation has been found to be inadequate air quality,
allowing contaminants to block internal orifices� Air filtering is
included within the instrument but cannot cope with sustained
poor air quality, which may ultimately lead to failure�
The recommendations in the Pneumatic Installation section
should be rigorously observed�
Note: These instruments are factory calibrated at a supply
pressure of 30psig (2 bar).
The instrument cover must be unscrewed to obtain access to
the trimpots�
Do not remove the instrument cover in a potentially explosive
atmosphere when the instrument is powered�
An accurate current source of 4-20mA and pressure gauge are
required� These should be of good quality with an accuracy of
0�1% or better� The current source should be checked to ensure
that it provides at least 6�5V at 20mA output compliance�
• Connect the instrument as described in the installation
section or the test-jack section below�
• Remove the instrument cover to gain access to the
trimpots and jack-socket�
• Set the current to 4�00mA – the instrument outlet should
be 3�00+/-0�05psig (0�200+/-0�003 bar)� Adjust the Zero
trimpot if necessary�
• For 6-30 psig output, the output pressure should be set
to 6�00 ±�05 psig (0�400 ± �003 bar)� Adjust trimpot as
necessary�
• Set the current source to 20�00mA – the instrument outlet
should be 15�00 +/-0�05psig (1�00+/-0�003 bar)� Adjust the
Span trimpot if necessary�
• For 6-30 psig output, the output pressure should be set
to 30�00 ±�05 psig (2�00 ± �003 bar)� Adjust trimpot as
necessary�
If either Span or Zero controls are adjusted it may be
necessary to repeat the above steps until both ends are within
the calibration limits�
Alternatively the Jack Plug can be connected to calibrate and
test the unit� The Jack Plug can be either set-up for Monitoring
or Calibration/Operation set-up�
