PART TWO - INSTALLATION
SECTION 3 - ELECTRICAL CONNECTIONS
Rev. 6-501
Model P53 pH/ORP Analyzer (universal-mount 1/2 DIN)
23
S
ECTION
3
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3.1 GLI Differential
Technique Sensor
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To access terminals for electrical connections, open the left-
hinged enclosure door by unscrewing the four fasteners.
Figure 2-3 or 2-4 shows the terminal arrangement and their
designations.
NOTE:
All terminals are suitable for single wires up to 14
AWG (2.5 mm
2
). If the analyzer is equipped with
only relays A and B, “RELAY C” and “RELAY D”
terminals will not function (all relay designations are
always shown).
Wiring Tip!
To comply with European Community (CE)
electromagnetic compatibility requirements, follow these
general wiring guidelines:
1.
Keep all cable shields as short as possible inside
the analyzer, and connect them to the ground ter-
minals provided. Performance may be improved by
using cable glands that enable the shield to directly
contact the analyzer chassis.
2.
Use Steward ferrite 28 B0590-000 or equivalent on
the sensor cable -- two turns required.
3.
In harsh conducted RF conditions, connect the
earth ground of the analyzer to a local, known earth
ground source.
NOTE:
For easier wiring, connect line power and relay out-
puts through the back conduit holes before connect-
ing sensor and analog outputs through the front holes.
All GLI Differential Technique sensors have a built-in tem-
perature element for automatic temperature compensation
and for measuring process temperature.
Wiring Tip!
Route the sensor cable in 1/2-inch,
grounded metal conduit to protect it from moisture,
electrical noise, and mechanical damage.
For installations where the distance between sensor
and analyzer exceeds the sensor cable length, indirectly
connect the sensor to the analyzer using a junction box
and interconnect cable.
ELECTRICAL CONNECTIONS
