User Guide

8
PROBE CONNECTION & PREPARATION
To prepare the instrument for use, connect
the D.O. probe to the meter securely by
aligning the pins with the socket located on
the back of the meter, pushing the plug in
and tightening the threaded ring.
All probes shipped from Hanna Instruments
are dry. To hydrate the probe and prepare it
for use, connect it to the meter and proceed
as follows.
1. Remove the red and black plas-
tic cap. This cap is for shipping
purposes and can be thrown
away.
2. Wet the sensor by soaking the
bottom 2½ cm (1") of the probe
in electrolyte (HI 7041S) for 5 minutes.
3. Rinse the membrane cap (HI 76407A sup-
plied in the kit with the meter) with elec-
trolyte solution while shaking it gently.
Refill with clean electrolyte solution.
4. Gently tap the sides of the membrane cap
with your finger tip to
ensure that no air
bubbles remain trapped.
To avoid damaging the
membrane, do not tap
the membrane directly
on the bottom.
5. Make sure that the rub-
ber O-ring sits properly
inside the membrane
cap.
6. With the sensor facing down,
slowly screw the cap clockwise.
Some electrolyte will overflow.
When not in use and during polar-
ization (see below), place the pro-
tective transparent cap supplied in
the kit with the meter.
S
hipping
cap
black
red
THEN SCREW
BACK ON
THEN TAP
FILL FIRST