Specifications

3. Operation MI 611-211 – October 2005
33
5. Adjust the millivolt supply to your first value as determined by the formula in
Table 12 and press ENTER. Wait for the display READING XXXXXXXX to alternate
with the message ENTER TO EDIT and then press ENTER again.
6. If the reading is not correct, enter the correct value under VALUE 1. Press ENTER.
Wait for a display of CAL COMPLETE (for SINGLEPT) or IMMERSE IN SOL 2
(for TWO PT). If calibration was not successfully completed, The display will read
CAL ERROR and return you to MANUAL SINGLEPT or MANUAL TWO PT.
7. If you are doing a 2-point calibration, adjust the millivolt supply to the second value
and repeat the procedure.
8. Go to Measure mode. Adjust the millivolt source to a known value between the
calibration points and verify the measurement as displayed on the transmitter per
Table 12.
9. Go to Configuration mode to reset the temperature to
AUTO or desired MANUAL
setting as necessary.
10. Lastly, reconnect your sensor wires to the transmitter.
Table 12. Millivolt Supply Formulas
Measurement
Mode
mV Power Supply
Formula Examples
Glass pH (pH-7)x (-59.16) pH0: (0-7) x (-59.16) = +414.1 mV
pH14: (14-7) x (-59.16) = -414.1 mV
Antimony pH (pH-1)x (-55) pH0: (0-1) x (-55.00) = +55.0 mV
pH7: (7-1) x (-55.00) = -330.0 mV
ORP (mV) Input absolute millivolt
ISE -59 x log (expected F
-
in ppm) + 118 mV
Fluoride (F
-
)
Charge is negative and monovalent (n=-1)
Typical mV values:
1 ppm: (-59)log(1) +118 = 118 mV
2 ppm: (-59)log(2) +118 = 100 mV
10 ppm: (-59)log(10) = 118 = 59 mV
100 ppm: (-59)log(100) +118 = 0 mV