Hanna Instruments HI 9147-04 User Manual

Instruction Manual

HI 9147

Portable, Water-resistant

Dissolved Oxygen Meter

with

Galvanic Probe

and

Battery Recharging System

www.hannainst.com

WARRANTY

Dear Customer,
Thank you for choosing a Hanna product.
Please read carefully this instruction manual before using the

meter. If you need additional technical information, do not
hesitate to e-mail us at [e-mail].

This instrument is in compliance with the CE directives.

PRELIMINARY EXAMINATION

Remove the instrument from the packing material and exam­ine it carefully to make sure that no damage has occurred
during shipment. If there is any damage, notify your Dealer.

The meter is supplied complete with

• D.O. probe, fixed:
HI 76409/4 with 4 m cable for HI 9147-04
HI 76409/10 with 10 m cable for HI 9147-10

• Spare membranes (HI 76409A/P) with O-rings, 5 pcs.

• HI 7042S electrolyte solution (30 ml bottle)

• HI 710016 shockproof rubber boot

• 9V Ni-MH rechargeable battery

• Screwdriver and instructions.

Note: Conserve all packing material until the instrument has

been observed to function correctly. Any defective item
must be returned in its original packing.

GENERAL DESCRIPTION

FUNCTIONAL DESCRIPTION

SPECIFICATIONS

Range 0.0 to 50.0 mg/L (ppm) O

0 to 600 % O

-5.0 to 50.0°C

Resolution 0.1 mg/L or 1% (O2) / 0.1°C
Accuracy ±1% of reading (O2) / ±0.2°C
Typical EMC Deviation ±2% of reading (O2) / ±1°C
Calibration Manual, in saturated air

Temperature Compensation

Automatic, from -5 to 50°C (23 to 122°F)

Salinity Compensation 0 to 51 g/L (resolution 1 g/L)
Probe (fixed) HI 76409/4 with 4 m cable or

HI 76409/10 with 10 m cable
Battery Type 1 x 9V Ni-MH, rechargeable
Battery Charge Life 200 hours of use (BL off)
Battery Life Approx. 5 years
Auto-off After approx. 6 minutes
Environment 0 to 50°C (32 to 122°F);

max 95% RH non-condensing
Dimensions 164 x 76 x 45 mm

(6.5 x 3.0 x 1.8")

Weight (with HI 76409/4 probe) 511 g (1.12 lb.)

2

2

HI 9147 meters are guaranteed for two years against
defects in workmanship and materials when used for their
intended purpose and maintained according to instructions.

The probes are guaranteed for one year.

This warranty is limited to repair or replacement free of charge.
Damages due to accident, misuse, tampering or lack of pre­scribed maintenance are not covered.
If service is required, contact the dealer from whom you
purchased the instrument. If under warranty, report the model
number, date of purchase, serial number and the nature of
the failure.
If the repair is not covered by the warranty, you will be
notified of the charges incurred.
If the instrument is to be returned to Hanna Instruments, first
obtain a Returned Goods Authorization Number from the
Customer Service department and then send it with shipment
costs prepaid. When shipping any instrument, make sure it is
properly packaged for complete protection.

Hanna Instruments reserves the right to modify the design, construction

and appearance of its products without advance notice.

Oxycheck is a water-resistant Dissolved Oxygen meter with
manual calibration, automatic temperature compensation (ATC),
salinity compensation and direct probe.
The instrument is equipped with an inductive system for battery
recharge, with no external contact, to ensure a watertight seal.
Dissolved Oxygen is indicated in mg/L (ppm) or in % of saturation.
The temperature can be measured in the range from -5 to 50°C.
The Dissolved Oxygen readings are automatically compensated for
the temperature effects on the oxygen solubility and membrane
permeability. Moreover, the salinity compensation feature allows
determination of Dissolved Oxygen even in salty waters.
The meter is housed in a rugged water-resistant case for maximum
protection in the field as well as in the laboratory.
The D.O. probe is provided with a membrane covering the galvanic
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.
Oxygen that passes through the membrane causes a current flow,
from which the oxygen concentration is determined.
Two models are available:

• HI 9147-04 with HI 76409/4 probe (4 m cable)

• HI 9147-10 with HI 76409/10 probe (10 m cable)

1) HI 76409/4 or HI 76409/10 galvanic D.O. probe (fixed)

2) Liquid Crystal Display

3) BL key, turn the backlight ON (as long as it is pressed)

4) °C key, display temperature measurement

5) % key, display O2 measurement in % of saturation

6) % trimmer, for calibration adjustment

7) SAL trimmer, for setting salinity compensation value

8) SAL key, display setting of salinity factor (active only in
mg/L measurement mode)

9) mg/L key, display O2 measurement in mg/L (ppm)

10) OFF key, turn the instrument OFF

Note: To turn the instrument ON, press any of the

measurement keys (°C, %, mg/L)

ACCESSORIES

HI 76409/4* Galvanic D.O. probe with built-in temperature

sensor and 4 m cable

HI 76409/10* Galvanic D.O. probe with built-in temperature

sensor and 10 m cable

HI 76409-0 Protective sleeve for HI 76409 probes series
HI 76409A/P Membrane for HI 76409 probes series, 5 pcs.
HI 7042S Electrolyte solution, 30 ml bottle
HI 710015 Shockproof rubber boot, blue color
HI 710016 Shockproof rubber boot, orange color
HI 731326 Calibration screwdriver (20 pcs)
HI 710040 Battery recharger

* To be substituted by authorized technical personnel only

IST9147R2 05/05

PROBE PREPARATION

CALIBRATION

SALINITY COMPENSATION

BATTERY RECHARGE & REPLACEMENT

All Hanna D.O. probes are shipped dry. To hydrate the probe and
prepare it for use proceed as follows:

1. Remove the black & red plastic cap. This cap is used for
shipping purposes only and can be thrown away.

2. Insert the supplied O-ring in
the membrane (see figure).

3. Rinse the supplied membrane (HI 76409A) with electro­lyte while shaking it gently. Refill with clean electrolyte.
Gently tap the membrane over a surface to ensure that
no air bubbles remain trapped. To avoid damaging the
membrane, do not touch it with your fingers.

4. Whit the sensor facing down screw the cap clockwise to
the end of the threads. Some electrolyte will overflow.

Calibration is a very simple 1-point procedure, performed in air.

Ensure the probe is ready for measurements, i.e. the membrane is
filled with electrolyte (see “Probe Preparation” section for details).

Switch the meter on, select the % mode and turn the % trimmer
to display 100%.

If the environmental relative humidity is lower
than 30%, pour some deionized water (approx.
3 mm) in the white cap supplied with the
membrane. Insert the probe in the cap and
calibrate.
Keep the probe in vertical position to avoid any
contact of the membrane with the water.

Note: For best accuracy, calibration should be performed on the

measurement site, and the probe should be at the same
temperature as the air.

Note: After replacing the membrane or the electrolyte solution,

wait a few minutes for the reading to stabilize.

TAKING MEASUREMENTS

Ensure the meter has been calibrated. Ensure the temperature
sensors are immersed in the sample to be tested.

The D.O. reading can be displayed in % air saturation or in
ppm (mg/L); press the corresponding key to enter the desired
mode. The instrument also measures the temperature: press
the “°C” button to display the temperature value of the tested
solution.

For accurate dissolved oxygen measurements a water move­ment of at least 5-7 cm/sec is required. In this way a constant
replenishment of the oxygen-depleted membrane surface is
ensured.

During field measurements, this condition may be achieved by
manually agitating the probe into the solution being mea­sured. Accurate readings are not possible in still water.
During laboratory operations, the use of a magnetic stirrer is
recommended.

Note: For some particular applications, such as fish farming,

the membrane can be sterilized with stabilized iodine
(20 to 50 ppm), typically used for this purpose.

Note: For use in harsh environments, it is recommended to

protect the membrane with the optional HI 76409-0
sleeve. The response time will slightly slow down.

Oxygen measurements (mg/L range only) can be compensated for
salinity factor and the correction value can be set by the user.
Enter the mg/L mode by pressing the corresponding key.
Keep the SAL button pressed while turning the SAL trimmer to
display the desired salinity value (within the 0 to 51 g/L range).

ALTITUDE COMPENSATION

When salinity compensation is not required (i.e. not salty water),
the SAL trimmer can be used to set the altitude correction value.
Enter the mg/L mode by pressing the corresponding key.
Keep the SAL button pressed while turning the SAL trimmer to
display the salinity value corresponding to the desired altitude.
See below table for reference:

PROBE & MEMBRANE MAINTENANCE

For a top performance probe, it is recommended to replace the
membrane every 2 months and the electrolyte once a month.

Proceed as follows:

• Unscrew the membrane by turning it counterclockwise.

• Rinse the supplied spare membrane (HI 76409A) with

some electrolyte solution while shaking it gently. Refill
with clean electrolyte.

• Gently tap the membrane over a surface to ensure that

no air bubbles remain trapped.

• Whit the sensor facing down screw the cap clockwise to

the end of the threads. Some electrolyte will overflow.

If any deposit scales the sensors, gently brush the sensor surface with
the supplied scouring pad, while paying attention to not damage
the plastic body.

The instrument features a battery level control system: the “V” tag
on the LCD lights up to advise the user that only a few hours of
working life are left.

The instrument is also provided with BEPS (Battery Error
Preventing System), which turns the meter off if the battery
level is too low to ensure reliable readings.

The 9V battery provided with the instrument can be recharged
using the optional HI 710040 battery recharger.

Plug the recharger and the green LED will turn on, then put
the meter on the recharger and the LED will turn to orange, to
indicate that the battery is charging.

It will take approx. 14 hours to completely charge the battery.
The supplied 9V Ni-MH rechargeable battery can last for

approximately 5 years. When the battery needs to be re­placed, remove the cover on the rear of the meter and replace
the rundown battery with a new one, while paying attention
to the correct polarity.

Replacement should take place in a non-hazardous area using
a 9V Ni-MH rechargeable battery.

Note: The meter can also be powered with a normal 9V

alkaline battery. Never use the HI 710040 recharger

with non-rechargeable battery.

Note: Dispose of the Ni-MH battery according to local

regulations.

Recommendations for Users

Before using this product, make sure that it is entirely suitable for the environment in which it is used.
Operation of this instrument in residential area could cause unacceptable interference to radio and TV
equipment, requiring the operator to take all necessary steps to correct interference.
Any variation introduced by the user to the supplied equipment may degrade the instruments' EMC
performance. To avoid electrical shock, do not use this instrument when voltages at the measurement
surface exceed 24 Vac or 60 Vdc. To avoid damage or burns, do not perform any measurement in
microwave ovens.