Hanna Instruments HI 8043 User Manual
Instruction Manual
HI 8043
Portable
Dissolved Oxygen Meter
DO meter
HI 8043
STB
OFF
°C
O
2
ZERO
SLOPE
ins
rum
°C
n
s
This Instrument is in
Compliance with the CE
Directives
1
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, as well as a more precise idea of its
versatility in a wide range of applications.
If you need additional technical information,
do not hesitate to e-mail us at
tech@hannainst.com.
This instrument is in compliance with the
directives.
TABLE OF CONTENTS
Preliminary Examination............................. 3
General Description .................................... 3
Functional Description Probe...................... 4
Functional Description Meter...................... 5
Specifications ............................................. 6
Initial Probe Preparation ............................. 7
Dissolved Oxygen Calibration ..................... 9
Temperature Calibration ............................ 15
Taking Measurements .............................. 16
Probe & Membrane Maintenance ............. 17
Battery Replacement ................................ 19
Accessories.............................................. 20
Warranty ................................................... 21
CE Declaration of Confirmity .................... 22
2
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.
Each meter is supplied with:
• DO Meter
• DO Probe (HI 76401)
• Membrane cap (2 pcs)
• O-ring (2 pcs)
• Protective cap
• 30 mL electrolyte solution (HI 7041S)
• Screwdriver for calibration purposes
• 1 x 9V battery
• Instruction manual
Note: Save all packing material until you are
sure that the instrument functions
correctly. All defective items must be
returned in the original packaging with
the supplied accessories.
GENERAL DESCRIPTION
HI 8043 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 this value is compensated for the temperature effect (ATC).
The dissolved oxygen probe has a membrane
covering the polarographic sensors and a builtin thermistor for temperature measurements
and compensation. The thin permeable mem-
3
brane isolates the sensor elements from the
sample tested, 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.
FUNCTIONAL DESCRIPTION PROBE
1. D.O. Probe
2. Protective Cap
3. Watertight Shielded Cable
4. Probe Body
5. O-Ring Seal
6. Silver Chloride Anode
7. Platinum Cathode (sensor)
8. Oxygen Permeable PTFE Membrane
9. Membrane Cap
4
FUNCTIONAL DESCRIPTION
1
3
DO meter
STB
OFF
HI 8043
°C
O
2
42
5
9
6
7
ZERO SLOPE °C
8
s
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1.Liquid Crystal Display
2."OFF" (to switch the meter off)
3."STB" (to switch the meter on and polarize
the probe. Use this standby position without switching the meter off if you are
going to take further measurements)
4."°C" Measurement
5."O2" Measurement
6.ZERO Calibration Trimmer
7.SLOPE Calibration Trimmer
8.°C Calibration Trimmer
9.Rotary Switch
5
SPECIFICATIONS
Range DO 0.00 to 19.99 mg/l
Resolution DO 0.01 mg/l
Accuracy DO ±1.5% of full scale
Typical EMC DO ±1.5% of full scale
Deviation °C ±1°C
Calibration Manual on 2 points
Temperature Automatic from 0 to 30°C
Compensation (32 to 86°F)
Probe HI 76401 polarographic
Battery 9V / 100 hours of continuous use
Environment 0 to 50°C (32 to 122°F); 95% RH
Dimensions 180 x 83 x 40 mm (7.1 x 3.3 x 1.6")
Weight 650 g (23 oz.) with probe and
°C 0.0 to 50.0°C (32 to 122 °F)
°C 0.1°C
°C ±0.5°C
with 3 m cable
soft carrying case
6
INITIAL PROBE PREPARATION
Shipping
PROBE PREPARATION
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
plastic cap. This cap is for
cap
shipping purposes and can
be thrown away.
2 Wet the sensor by soak-
black
ing the bottom 2½ cm (1")
of the probe in electrolyte
red
(HI 7041S) for 5 minutes.
3 Rinse the supllied mem-
brane (HI 76407A) with
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. To
avoid damaging the membrane, do not tap the membrane directly on the bottom.
5 Make sure that the rubber O-ring sits prop-
erly inside the membrane cap.
6 With the sensor facing down, screw the
cap clockwise. Some electrolyte will overflow.
When not in use, place the
protective cap supplied in the
kit with the meter.
7
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 recurring degree of accuracy.
In the presence of the 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.
Whenever measurements are taken with a
non-polarized probe, the oxygen level detected
by the meter is both that of the tested sample
as well as the oxygen present in the electrolyte solution itself.
By leaving the instrument in
OFF
STB
°C
O
the "STB" mode, which signifies keeping the probe in a
continual state of polarization, the oxygen which is
present in the electrolyte solution is progressively "consumed", and the following measurements detect only the quantity of oxygen
present 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.
STB
Polarization is not maintained
when the instrument is
OFF
°C
O
switched to the "OFF" position.
2
2
8
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