43
mV INPUT CALIBRATION
The pH/mV controller is factory calibrated for the mV and
temperature inputs. However, the user may also perform
a mV calibration.
• Short the Connection for Potential Matching Pin (#5 on
page 7) and the Connection for the Electrode Reference
(#6 on page 7) with a jumper wire.
• Attach a HI931001 (
HI21
) or HI8427 (
HI22
) simulator
to the BNC socket.
• Press and hold first CFM and
then CAL to enter the mV Input
Calibration mode.
• Execute the password procedure.
• With
HI21
, the meter will ask for the calibration procedure
code number. The following table lists the possible values
of the input code and calibration points:
* One of the points must be 0.1900 mV calibration point is available on
HI22 models only.
When calibrating the mV of HI22 models, enter the
calibration mode by pressing CAL and confirming the
password (as for pH calibration of HI21). No code selec-
tion is required.
• Use
or
to select code 0 for mV calibration and press
CFM to enter.
• CAL will blink on the LCD until the meter confirms a steady
reading.
INPUT
CODE
POINTS CAL. VALUES
INPUT RANGE
mV
0
2
0 & 350 or 0 & 1900* ±2000
Temp.
1
2
0 & 25 or 0 & 50
-9.9 to 120.0 ˚C
