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PART TWO - INSTALLATION
SECTION 3 - ELECTRICAL CONNECTIONS
Rev. 7-1201
Model P63 pH Analyzer
23
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3.1 GLI Differential
Technique Sensor
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NOTE:
For best EMI performance, terminate the shield wire
of a GLI Differential Technique sensor as close as
possible to the cable entry point instead of to the
“SHLD” terminal 6 on TB1.
Recommended Termination:
Use the cord grip nut
to capture the shield wire as shown in Figure 2-4.
When using a conventional combination electrode
with a coaxial cable, the cable’s shield must be con-
nected to the “REFERENCE” terminal 3 on TB1.
FIGURE 2-4
Sensor Shield Wire Connection for Best EMI Performance
All GLI Differential Technique sensors have a built-in tem-
perature element for automatic temperature compensation
and accurate process temperature measurement. In appli-
cations requiring extremely high accuracy for temperature
measurement and compensation, or those in which the sen-
sor cable run is more than 2000 ft./610 m, it may be best to
use an external Pt 1000 ohm RTD temperature sensor.
Installation Tip!
Route the sensor cable in 1/2-inch,
grounded metal conduit to protect it from moisture, elec-
trical 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.
NOTE:
Do not route the sensor cable in any conduit con-
taining AC power wiring (“electrical noise” may
interfere with the sensor signal).
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