PART TWO - INSTALLATION
SECTION 3 - ELECTRICAL CONNECTIONS
Model P33 pH/ORP Analyzer (panel-mount 1/4 DIN)
Rev. 6-1100
22
S
ECTION
3
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3.1 GLI 5-Wire Differential
Technique Sensor
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Figure 2-3 or 2-4 on the next page shows the terminal ar-
rangement and designations on the back of the analyzer.
NOTE:
For easier wiring, terminal blocks can be unplugged
from their mating connectors. All terminals are suit-
able for single wires up to 14 AWG (2.5 mm
2
).
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 and con-
nect them to earth ground.
2.
Use Steward ferrite 28 B0590-000 or equivalent on:
◆
Mains (line power) cable -- no turns required.
◆
Sensor cable -- one turn required.
◆
mA analog output cables -- two turns required.
◆
Relay cables -- no turns required.
3.
In harsh conducted RF conditions, connect the earth
ground of the analyzer (Terminal 4 on TB1) to a lo-
cal, known earth ground source.
All GLI 5-wire Differential Technique sensors have a built-in
NTC 300 ohm temperature element (except Model 6006P4-
2000 high purity water pH sensor systems which use
Pt1000 ohm RTD) 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.
NOTE:
Do not route the sensor cable in any conduit con-
taining AC or DC power wiring (“electrical noise”
may interfere with the sensor signal).
ELECTRICAL CONNECTIONS
