User Guide

14
RESET BUTTON
The RESET button (see page 4, #5 for
HI 931402, or page 6, #3 for HI 931410) is
used when the instrument displays erroneous
messages due to strong electrical interfer-
ence or when the instrument's power supply
was disconnected before the meter was
switched off.
It is necessary to press the reset button and
restart the entire operation.
Calibration points should remain memorized.
It is recommended to verify calibration before
proceeding.
RECORDER OUTPUT (for HI 931410 only)
HI 931410 is provided with a recorder output
from 0 to 2 volts. Connect the recorder output
(see page 6, #4) and select the pH or mV range
by pressing the pH/mV key. The output signal
is related to the values as follows:
pH output:
0.01 pH = 1.42857 mV
e.g. 0.00 pH = 0 mV
7.00 pH = 1000 mV
14.00 pH = 2000 mV
mV output:
0.1 mV = 0.05 mV
e.g. -1999 mV = 0 mV
0.0 mV = 1000 mV
+1999 mV = 2000 mV
The output impedance is 100 ohms. The maxi-
mum output short-circuit current is 20 mA.
AFTER MEASUREMENTS
Press the OFF key to switch the instrument off.
OFF
OFF