Instruction manual

16
MODEL XMT-A-FF/FI SECTION 3.0
SENSOR WIRING
FIGURE 3-5. Xmt-A-FF panel mount; free chlorine
sensor with standard cable and 399-09-62 pH sensor.
FIGURE 3-6. Xmt-A-FF panel mount; free chlorine
sensor with standard cable and 399-VP-09 pH sensor.
Xmt-A-FF mounting Free chlorine sensor cable pH sensor Figure
Panel standard 399-09-62 3.5
standard 399-VP-09 3.6
standard 399-14 3.7
EMI/RFI or Variopol 399-09-62 3.8
EMI/RFI or Variopol 399-VP-09 3.9
EMI/RFI or Variopol 399-14 3.10
Wall/pipe standard 399-09-62 3.11
standard 399-VP-09 3.12
standard 399-14 3.13
EMI/RFI or Variopol 399-09-62 3.14
EMI/RFI or Variopol 399-VP-09 3.15
EMI/RFI or Variopol 399-14 3.16
3.2 WIRING MODEL 499ACL-01 (Free Chlorine) SENSORS AND pH SENSORS
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 be wired to the transmitter. This section gives wiring
diagrams for the pH sensors typically used.
When using the 499ACL-01 (free chlorine) sensor with a pH sensor, use the RTD in the pH sensor for measuring
temperature. DO NOT use the RTD in the chlorine sensor.
The pH sensor RTD is needed for temperature measurement during buffer calibration. During normal operation, the RTD
in the pH sensor provides the temperature measurement required for the free chlorine membrane permeability correction.
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 provided with the chlorine sensor to make the con-
nection. Insulate and tape back unused wires.