Hanna Instruments HI 8043 User manual

HI8043
Portable Dissolved Oxygen
Meter
INSTRUCTION MANUAL

Thank you for choosing a Hanna Instruments product.
Please read this instruction manual carefully before
using the instrument.
This manual will provide you with the necessary
information for correct use of the instrument, as well
as a precise idea of its versatility.
If you need additional technical information, do not
hesitate to e‑mail us at [email protected] or view
our worldwide contact list at www.hannainst.com.
Dear
Customer,
All rights are reserved. Reproduction in whole or in part is prohibited
without the written consent of the copyright owner, Hanna Instru-
ments Inc., Woonsocket, Rhode Island, 02895, USA.

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Included .............................................................................
Safety measures..................................................................
Description..........................................................................
Product diagram..................................................................
Probe diagram ....................................................................
Probe preparation................................................................
Specifications......................................................................
Probe polarization ...............................................................
Calibration..........................................................................
Operational guide................................................................
Probe and membrane maintenance.......................................
Battery replacement.............................................................
Accessories..........................................................................
TABLE OF CONTENTS
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10
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21
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7
9
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19
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Remove the instrument and accessories from the packaging
and verify damage has not occurred during shipping. Remove
protective film from meter. Notify your nearest Hanna Customer
Service Center if damage is observed.
Packaging for each HI8043 instrument includes:
• Spare membrane with O‑Ring (2 pcs.)
• Calibration screwdriver
• 9V battery
• Instruction Manual
• Quality Certificate
• HI76401: Dissolved Oxygen probe
• HI7041S: electrolyte solution (30 mL)
• Protective cap
Note: Save all packing material until you are sure that the
instrument works correctly. Any defective item must be
returned in its original packing.
INCLUDED
Before using this product, make sure that it is entirely suitable
for your specific application and for the environment in which
it is used.
Operation of this instrument may cause interference to other
electronic equipment, requiring the operator to take steps to
correct interference. Any variation introduced by the user to
the supplied equipment may degrade the instrument’s EMC
performance.
To avoid damages or burns, do not put the instrument in
microwave ovens. For your and the instrument’s safety, do not
use or store the instrument in hazardous environments.
SAFETY MEASURES

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HI8043 is a portable meter for Dissolved Oxygen measurements.
It is housed in a lightweight case, with an easy‑to‑read LCD.
Dissolved oxygen and temperature measurements can be
performed in the field (wastewater treatment, fish‑farming, water
analysis, etc.) as well as in the laboratory without compromising
accuracy.
Dissolved oxygen is indicated in mg/L (ppm) and the reading is
compensated for the temperature effect (ATC).
The dissolved oxygen probe is provided with a membrane for
covering the polarographic sensors, and features a built‑in
thermistor for temperature measurements and compensation.
The thin permeable membrane isolates the sensor elements from
the sample, but allows oxygen to enter.
A voltage is applied across the sensor, and the oxygen that has
passed through the membrane reacts causing the current to flow,
hence determining a reading.
A convenient feature of the instrument is its standby mode which
keeps the probe polarized and ready for instant measurements.
DESCRIPTION

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PRODUCT DIAGRAM
1. Liquid Crystal Display (LCD)
2. stb (to switch the meter on and polarize the probe. Use
this standby position with out switching the meter off if
you are going to take further measurements.)
3. off (to switch the meter off)
4. Rotary switch
5. Zero calibration trimmer
6. Slope calibration trimmer
7. °C calibration trimmer
8. O2measurement
9. °C measurement
10. Probe connector
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2
3
4
5
6
7
8
9
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PROBE DIAGRAM
1
2
3
6
7
8
9
4
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1. Watertight Shielded Cable
2. Probe Body
3. O‑Ring Seal
4. Protective Cap
5. DO Probe
6. Silver Chloride Anode
7. Platinum Cathode (sensor)
8. Oxygen Permeable Membrane
9. Membrane Cap
HI76401
Dissolved Oxygen Probe

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The main operating modes of HI8043 are calibration and
measurement. Follow this general outline of steps to get you
started.
1. Decide how the meter will be used and set up a clean area.
2. Connect the HI76401 probe to the meter.
3. Turn HI8043 on using the rotary switch.
4. Calibrate the probe.
You are now ready for measurements.
All DO probes 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 only
used for protecting the probe during shipment, and
can be thrown away.
2. Wet the sensor by soaking the bottom
(2.5 cm/1”) of the probe in HI7041S
electrolyte solution for 5 minutes.
3. Rinse the supplied membrane with some
electrolyte while shaking it gently. Refill
with clean electrolyte.
4. Gently tap the sides of the membrane with
your finger tip to ensure that no air bubbles
remain trapped inside. To avoid damaging
the membrane, do not tap the membrane
directly on the bottom.
5. Make sure that the rubber O‑Ring sits properly
inside the membrane cap.
PROBE PREPARATION
6. With the sensor facing down, screw the cap clockwise.
Some electrolyte will overflow. When the probe is not used,
protect the membrane with the supplied cap.

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O2Temperature
Range 0.00 to 19.99 mg/L 0.0 to 50.0 ºC ;
(32.0 to 122.0 °F)
Resolution 0.01 mg/L 0.1 ºC
Accuracy
@ 25 °C / 77 °F
±1.5% F.S. ±0.5 ºC
Calibration Manual, two point (zero and slope)
Temperature
compensation Automatic 0 to 30 ºC (32 to 86 ºF)
Probe
HI76401 polarographic probe with 3 m (10’)
cable (included)
Battery Type 9V alkaline (1 pcs.)
Battery Life Approximately 100 hours of continuous use
Environment 0 to 50 ºC (32 to 122 ºF)
Max 95% RH non‑condensing
Dimensions 180 x 83 x 40 mm (7.1 x 3.3 z 1.6”)
Weight 240 g (8.4 oz.)
SPECIFICATIONS

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PROBE POLARIZATION
When the probe is under polarization it is continuously fed with a
voltage of approximately 800 mV.
Probe polarization is essential for stable measurements to be
taken with the same degree of accuracy.
With polarized probe, oxygen is continually “consumed” by
passing through the sensitive diaphragm and dissolving in the
electrolyte solution contained in the probe.
If this operation is interrupted, the electrolyte solution continues
to be enriched with oxygen until it reaches an equilibrium with
the surrounding solution.
If measurements are taken with a
non‑polarized probe, the oxygen level
detected by the meter is the sum of the
oxygen dissolved in the tested sample
and that of the electrolyte solution itself.
By leaving the instrument in the “stb” mode (i.e. keeping
the probe in a continual state of polarization), the oxygen of
the electrolyte solution is progressively “consumed”, and the
following measurements detect only the quantity of oxygen
dissolved in the sample to be tested.
Therefore, in order to keep the probe continuously polarized it is
necessary to switch the meter to the “stb” mode and wait for at
least 30 minutes. This should be done with the probe covered
with the protective cap and filled with some electrolyte solution.
Polarization is not maintained when the instrument is switched
"off".