HANNA instruments HI 9142 User Manual
Instruction Manual
HI 9142
Portable Waterproof
Dissolved Oxygen Meter
www.hannainst.com
Dear Customer,
Thank you for choosing a Hanna Instruments
Product.
Please read this instruction manual carefully
before using the instrument.
This manual will provide you with all the neces-
sary information for the correct use of the
instrument.
If you need additional technical information, do
not hesitate to e-mail us at
tech@hannainst.com
This instrument is in compliance with the CE
directives.
PRELIMINARY EXAMINATION
Remove the instrument from the packing material
and examine it to make sure that no damage
has occurred during shipping. If there is any
damage, notify your Dealer.
The meter is supplied complete with:
• HI 76407/4 DO probe with 4 m cable
• 2 spare membranes with O-rings
• HI 7041S electrolyte solution (30 mL)
• Calibration screwdriver
• Batteries (4 x 1.5V AA)
• Instruction manual
• Rugged carrying case
Note: Save all packing material until you are sure
that the instrument functions correctly. All
defective items must be returned to us in the
original packaging with the supplied
accessories.
TABLE OF CONTENTS
Preliminary Examination ............................. 3
General Description..................................... 3
Probe Functional Description ...................... 4
Meter Functional Description....................... 5
Specifications ............................................. 6
Probe Initial Preparation .............................. 7
Calibration Procedure .................................. 8
Taking Measurements............................... 10
Altitude and Salinity Compensation........... 1 1
Probe & Membrane Maintenance .............. 13
Battery Replacement ................................ 15
Accessories.............................................. 16
Warranty ................................................... 17
CE Declaration of Conformity .................... 18
2
GENERAL DESCRIPTION
HI 9142 is a rugged, waterproof meter that
solves the common problems of field use, such
as cold, rain, snow and dust, that can damage
a meter, rapidly deteriorating its performance
and life.
It is very simple to use: calibration is performed
with HI 7040 zero oxygen solution, while 100%
calibration is done in air.
The polarographic probe (HI 76407/4) is pro-
vided with a membrane covering the sensors
and a built-in thermistor for temperature measurement and compensation. The thin permeable membrane isolates the sensor elements
from the testing solution, but allows oxygen to
enter. When a voltage is applied across the
sensor, oxygen that has passed through the
membrane reacts causing current to flow, allowing the determination of oxygen.
3
The probe included with the meter is supplied
with a 4 m (13') cable that allows measurements
to be taken even in even hard to reach
places. For applications that require longer
probe cables, the HI 76407/10 and HI 76407/20
probes with a 10 m (33') or 20 m (67') cable are
available.
PROBE FUNCTIONAL DESCRIPTION
3
1
4
6
7
8
METER FUNCTIONAL DESCRIPTION
9
4
5
6
7
8
9
1. D.O. probe
2. Protective cap
3. Shielded cable
4. Polypropylene probe body
5. Temperature sensor
6. O-Ring seal
7. Silver chloride (AgCl) anode
8. Platinum cathode (sensor)
9. Oxygen permeable membrane
10.Membrane cap
4
2
10
1. Battery compartment
2. Probe connector
3. Liquid Crystal Display
4. ON/OFF button
5. Calibration button
6. Slope calibration trimmer
7. Zero oxygen calibration trimmer
5
SPECIFICATIONS
Range 0.0 to 19.9 mg/L (ppm)
Resolution 0.1 mg/L
Accuracy ±1.5% FS
Typical EMC ±0.8 mg/L
Deviation with 4 m cable probe
Calibration Manual, 1 or 2 point
(zero and slope)
Temperature Automatic, 0 to 30°C
Compensation (32 to 86°F)
Probe HI 76407/4, polarographic,
with 4 m (13') cable (included)
Battery Type 4 x 1.5V AA
Life approx. 500 hours of use
Environment 0 to 50°C (32 to 122°F);
RH max 100%
Dimensions 196 x 80 x 60 mm
(7.7 x 3.1 x 2.4")
Weight 500 g (1.1 lb.)
PROBE INITIAL PREPARATION
Probe Preparation
All D.O. probes from Hanna Instrument are
shipped dry. To hydrate the probe and prepare it for use, connect it to the meter and
proceed as follows.
1. Remove the red & black plastic
cap. This cap is used for ship-
Shipping
cap
ping purposes only and can be
thrown away.
2. Wet the sensor by soaking the
black
bottom (2.5 cm/1") of the probe
in HI 7041S electrolyte solution
red
for 5 minutes.
3. Rinse the membrane
(HI 76407A supplied
with the meter) with
some electrolyte
while shaking it gently. Refill with clean
electrolyte.
4. Gently tap the sides
FILL FIRST
THEN TAP
of the membrane
with your finger to
ensure that no air
bubbles remain
trapped inside.
THEN SCREW
BACK ON
To avoid damaging the membrane, do not
tap the membrane directly on the bottom.
5. Place the rubber O-Ring properly inside
the membrane cap.
6. With the sensor facing down, screw the
cap clockwise. Some electrolyte will overflow.
When not in use and during polarization, protect the membrane with
the supplied cap.
6
7
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