BATTERY REPLACEMENT
When batteries become too
weak, the “bAtt” message ap-
pears. It is recommended to re-
place the batteries soon.
When the battery level is too low to ensure reliable read-
ings, the meter automatically turns off.
Battery replacement must only
take place in a safe area and us-
ing the battery type specified in
this instruction manual.
To replace rundown batteries, re-
move the battery cover and sub-
stitute all four 1.5 V AA alkaline
batteries with new ones, while
paying attention to the correct po-
larity.
Reattach and tighten the battery
cover making sure that the gas-
ket is in place.
Note: When batteries are removed, the meter can re-
member date & time for about 5 minutes. After
that, it will be necessary to set again date & time
through the setup procedure.
4
AD331, AD431 and AD332 are waterproof portable
meters.
AD331 reads EC in 5 ranges, AD431 provides TDS
readings in 5 ranges, and AD332 can measure both EC
and TDS. All models also read temperature.
The autoranging feature of the EC and TDS ranges
automatically sets the instrument to the scale with the
highest resolution.
Measurements are compensated for temperature ef-
fect automatically (ATC) or manually (MTC). It is
also possible to disable the temperature compensation
feature to measure the actual conductivity.
The temperature coefficient is user selectable.
These instruments also feature a measurement stabil-
ity indicator, GLP capability, and a user selectable ID
code to uniquely identify the instrument.
Moreover, AD332 includes PC interface and printing
function. Connect the meter to an external serial printer
with the following printer specifications:
• at least 16 characters / line
• baud rate 9600
• 9-pin RS232 input
INTRODUCTION
37