Xylem 3675 pH CONTROLLER - Manual (Page 6)

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h) Adjust the SLOPE control for the instrument to display the buffer value
corresponding to the temperature measured in step 6 (f). Refer to Table 2.
i) Remove the pH electrode and ATC probe from the second buffer and rinse with
distilled water. The instrument is dual point calibrated and is now ready for
measurements.
Table 2 - Temperature Cofficient Of The Ph Buffers
BUFFERS
°C 10.01 7.00 4.01
0 10.32 7.11 4.00
5 10.25 7.08 4.003
10 10.18 7.06 4.00
15 10.12 7.03 4.00
20 10.06 7.01 4.00
25 10.01 7.00 4.01
30 9.97 6.98 4.02
35 9.93 6.98 4.02
40 9.89 6.97 4.03
45 9.86 6.97 4.04
50 9.83 6.97 4.06
55 9.80 6.97 4.07
60 9.78 6.98 4.10
VI) Isolation Voltage
The differential voltage between the outputs and the load should not exceed the
maximum values. Exceeding the maximum values may cause permanent damage to
the instrument and load.
a) Relay Output:
The maximum isolation voltage of the relay output contacts is 1500V DC, The
voltage differential between the relay output contacts and the load should not
exceed 1500V DC.
b) Current Output:
The maximum isolation voltage of the 4-20 mA output is 500V DC. The voltage
differential between the 4-20 mA output and the load should not exceed 500V
DC.