User Guide

Instruction Manual DO 100
3
2.2 Keypad
The large membrane keypad makes the instrument easy to use. Each button, when pressed,
has a corresponding graphic indicator on the LCD. See Figure 2. Some buttons have several
functions depending on its mode of operation.
Key Function
ON/OFF Powers on and shuts off the meter. When you switch on the meter, the meter
starts up in the mode that you last switched off from. For example, if you shut
the meter off in mg/L measurement mode, the meter will be in mg/L
measurement mode when you switch the meter on.
HOLD 1. Freezes the measured reading. To activate, press HOLD while in
measurement mode. To release, press HOLD again.
2. In its SETUP menu, this key takes you through the main menu.
MODE 1. Selects the measurement parameter. Press MODE to toggle between %
Saturation and mg/L or ppm mode.
2. While in the CAL mode under mg/L or ppm measurement status, this key
will toggle between mg/L (ppm) calibration and temperature calibration
(refer to Section 4.1 on page 9 to 10.)
CAL/MEAS 1. Toggles between Calibration and Measurement mode.
If you were in Measurement mode, press CAL/MEAS to enter Calibration
mode. To confirm calibration, press ENTER key.
To abort calibration, press CAL/MEAS key again to go back to
measurement mode.
2. While in SETUP, pressing CAL/MEAS takes you out directly into the
measurement mode.
ENTER 1. Press to confirm your calibration values in Calibration mode.
2. While in SETUP, pressing ENTER key takes you through the various
menu AND through each sub-menu.
MI & MR
/ 
In measurement mode:
Press MI / to store values in mg/L or % Saturation values with its
corresponding temperature values in the memory. Up to 16 sets of values can
be stored.
Press MR/ to retrieve data from memory in LIFO method.
In Calibration mode:
Scrolls up and down values with each key press, or helps make selection.
SET Takes you into the SETUP mode.