Functional Description - Hanna Instruments HI 98140 Instruction Manual

These instruments also feature a controlled access to calibration and
GLP settings through a password protection method.
The Battery Error Preventing System (BEPS) detects when the batter-
ies become too weak to ensure reliable measurements.
The backlight feature is automatically disabled when the batteries are
getting low and a clear indication is displayed to warn the user of
this condition. However, the meter continues to measure correctly even
when the low battery indication is displayed. The meter automatically
switches itself off when the batteries are too weak to support proper
function.
For long term field and lab applications, these meters can be connected
to a 12 Vdc adapter.
In addition, the meters allow the user to enter an ID code to uniquely
identify the instruments.
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FUNCTIONAL DESCRIPTION

1) Power adapter plug
2) RS232 connector
3) DIN connector for smart electrodes
4) Liquid Crystal Display (LCD)
5) ON/OFF key, to turn the meter ON and OFF
6) ALT key, to activate alternate key function
7) RANGE / GLP key, to select measurement range, to display time
and date, and to view calibration data (with ALT)
8) CAL / CALT key, to enter calibration mode
9) CFM key, to move down or confirm values (with ALT)
10) LOG / RCL key, to store or recall (with ALT) measurements
11) FNC key, to move up or enter setup mode (with ALT)
12) LIGHT / DEL key, to turn the LCD backlight on and off, and to
delete stored data (with ALT)
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