Hanna Instruments HI 93640NEW - Manual (Page 4)

6 7
OPERATIONAL GUIDE BATTERY REPLACEMENT
Turn the meter on by pressing the ON/OFF
button.
At start-up the instrument displays all LCD
segments for a few seconds, then it shows
the current RH (Relative Humidity) mea-
surements.
The humidity sensor should be exposed to a
current of air moving at 0.5 m (20") per sec-
ond or more.
In the absence of air movement, the response
can be accelerated by moving the probe.
The probe sensor must never come into
contact with water or other liquids.
If this happens, or if condensation causes drops
to form on the surface of the humidity sensor,
turn the instrument off and wait until the liquid
has evaporated completely. In order to acceler-
ate the evaporation process, expose the humid-
ity sensor to a current of air.
For a faster response, remove the sintered
cap. Whenever the probe is to be used in a
dusty or smoky environment, the cap must
be kept on at all times.
To take temperature measurements, press
the RANGE button to display the temperature
mode, then select the °C or °F measure unit with
the °C/°F button.
The meter is provided with an acoustic signal
feature activated when buttons are pressed,
which can be disabled using a switch located
in the battery compartment (see figure on next
page).
When the battery level is below 10%, the
battery symbol blinks on the LCD to warn the
user.
If the battery level is too low to ensure proper
operations, the Battery Error Prevention Sys-
tem (BEPS) turns the meter off. Immediately
replace the batteries with new ones.
Batteries are accessed by separating the
front and the back halves of the meter: un-
screw the 4 screws on the back of the meter
and carefully replace the three batteries, while
paying attention to their polarity.
Reattach the back making sure that the gas-
ket is in place and tighten the 4 screws to
ensure a watertight seal.
Battery replacement must only take place in
a safe area and using 1.5V AA alkaline bat-
teries.