Xylem 3675 pH CONTROLLER - Manual (Page 5)

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reference electrode to the Reference Input terminal.
f) Temperature Compensation Input Connections: Using the ATC mode, connect the
ATC input terminals. A precision 0.1% resistor can be connected across the ATC
terminals to simulate a fixed process temperature. Refer to Table 1 on page 4.
IV) Mounting Procedure
a) Make a cutout on any panel, with a thickness of 1/16 in (1.5 mm) to 3/8 in. (9.5
mm).
b) Remove the mounting brackets assembly from the panel meter and insert the
panel meter into the cutout.
c) Replace the mounting brackets assembly onto the panel meter and fasten the
mounting screws to secure the panel meter to the mounting panel.
V) pH Calibration
Refer to Rear Panel Connection Scheme and Temperature Compensation on page 4.
a) Rinse the pH electrode and ATC probe with distilled water.
b) Measure the temperature of the buffer 7 solution with a precision thermometer.
c) Immerse the pH electrode and ATC/TEMP probe in buffer 7. Allow sufficient
time for the pH electrode and ATC probe to reach temperature equilibrium with
the buffer 7.
d) Adjust the STAND control for the instrument to display the buffer value
corresponding to the temperature measured in step b. Refer to Table 2 on page 6.
e) Remove the pH electrode and ATC probe from buffer 7 and rinse with distilled
water.
f) Measure the temperature of a second buffer with a precision thermometer.
g) Immerse the pH electrode and ATC probe in the second buffer. Allow sufficient
time for the pH electrode and ATC probe to reach temperature equilibrium with
the second buffer. For accurate pH measurements, the second buffer should be
close in pH and temperature values to process under test. In practice, pH buffer 4
and 10 are commonly used.