Hanna Instruments HI 93542 - Manual (Page 7)

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The HI 93551R, HI 93552 and HI 93552R allow the user to select the
auto-off time period through the front keyboard; press (ALT+) AOFF to
enter the mode, then set the desired auto shut-off interval (8 min, 60
min, or disabled) with the ALT key; release all buttons, wait a few
seconds and the meter will return to normal measurement mode.
BACKLIGHT FEATURE
The HI 93551R, HI 93552 and HI 93552R
models are provided with a backlight feature,
which can be easily activated through the key-
board by pressing the (ALT+)BL keys.
Note: The backlight automatically shuts off after approximately 1
minute with no buttons pressed.
BATTERY COMPARTMENT
See "Battery replacement" section for back cover removal/installation.
2-CHANNEL MODELS (HI 93542, HI 93552 & HI 93552R)
HI 93542, HI 93552 and HI 93552R models can monitor two
samples through two independent temperature channels (probes).
The display shows the actual, Hi and Lo (or T1 and T2) values of the
selected channel (T1, T2 or T1-T2). The corresponding tags light up to
inform the user.
To select the desired channel, use the T1/T2 key.
The 2-channel and HI 93551R models are also provided with the
DISP function, which allows the user to select the information to be
displayed.
• While in T1 or T2, pressing DISP switches the display between
normal, relative and average measurement modes.
In the normal mode, the main body of the LCD shows the
current temperature while the lower portion displays the Hi/Lo
limits for that channel.
When the meter enters relative mode, the "REL" tag
lights up and the current temperature for that channel is set as
the reference temperature. Pressing CLR will also set the reference
to the current temperature.
In relative mode, the main body of the LCD shows the difference
from the reference temperature. The lower portion displays the
current temperature for the selected channel.
When average mode is entered, the "AVG" tag lights up
and the current value is set as the new beginning value. The
average can be reset by pressing CLR while in the average mode.
In average mode, the main body of the LCD shows the average
temperature, while the lower portion displays the current tem-
perature for the selected channel.