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MODEL 54eA SECTION 3.0
WIRING
3.3.3 Wiring 499ACL-01 (free chlorine) sensors and pH sensors for automatic pH correction.
If free chlorine is being measured and the pH of the liquid varies more than 0.2 pH unit, a continuous correction
for pH must be applied to the chlorine reading. Therefore, a pH sensor must also be wired to the 54eA controller.
This section gives wiring diagrams for the pH sensors typically used.
When using the 499ACL-01 sensor (free chlorine) with a pH sensor, use the RTD in the pH sensor for meas-
uring temperature. DO NOT use the RTD in the free chlorine sensor.
The pH sensor RTD is needed for temperature measurement during buffer calibration. During normal operation,
the RTD in the pH sensor also provides the temperature measurement required for the free chlorine membrane
permeability correction.
NOTE
When wiring a pH and amperometric sensor to the controller, connect the anode and reference
terminals (TB3-1 and TB5-1) with the 10M
ΩΩ
jumper (PN 23980-00) provided with the analyzer.
Refer to the table to select the appropriate wiring diagram. Most of the wiring diagrams require that two or more
shield wires be attached to a single terminal. Use the pigtail wire and wire nuts packed with the chlorine sensor to
make the connection.
Insulate and tape back unused wires.
Free chlorine sensor cable pH sensor Figure
Standard 399VP-09 3-5
Standard 399-14 3-6
Standard 399-09-62 3-7
EMI/RFI or Variopol 399VP-09 3-8
EMI/RFI or Variopol 399-14 3-9
EMI/RFI or Variopol 399-09-62 3-10
FIGURE 3-5. Free chlorine sensor with standard cable
and 399VP-09 pH sensor without internal preamplifier.
DWG. NO. REV.
4054eA01 B