Hanna Instruments HI 9146 Manual de usuario

Dissolved Oxygen

and

Temperature Meter

HI 9146

Instruction Manual

www.hannainst.com

Dear Customer,

Thank you for choosing a Hanna Instruments product.

Please read this instruction manual carefully before using this instrument.

This manual will provide you with the necessary information for correct

use of this instrument, as well as a precise idea of their versatility.

If you need additional technical information, do not hesitate to e-mail us

at [email protected].

TABLE OF CONTENTSTABLE OF CONTENTS

TABLE OF CONTENTS

HI 9146 is guaranteed for two years against defects in workmanship and

materials when used for its intended purpose and maintained according

to instructions. Electrodes and probes are guaranteed for six months. This

warranty is limited to repair or replacement free of charge.

Damage due to accidents, misuse, tampering or lack of prescribed

maintenance is 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 problem. 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 Technical Service

department and then send it with shipping costs prepaid. When

shipping any instrument, make sure it is properly packed for complete

protection.

WARRANTY ........................................................................................................... 2

PRELIMINARY EXAMINATION ................................................................................. 3

GENERAL DESCRIPTION ......................................................................................... 3

PROBE FUNCTIONAL DESCRIPTION ......................................................................... 4

METER FUNCTIONAL DESCRIPTION ......................................................................... 5

SPECIFICATIONS ................................................................................................... 7

OPERATIONAL GUIDE ............................................................................................. 8

AutoEnd ............................................................................................................. 12

DO CALIBRATION ................................................................................................. 12

GOOD LABORATORY PRACTICE (GLP) ..................................................................... 15

SETUP ................................................................................................................ 17

DO CONCENTRATION VERSUS SALINITY CHART ..................................................... 18

DO CONCENTRATION VERSUS ALTITUDE CHART ..................................................... 19

TEMPERATURE CALIBRATION (for technical personnel only).................................. 20

BATTERIES REPLACEMENT .................................................................................... 21

LCD MESSAGE GUIDE ........................................................................................... 22

PROBE & MEMBRANE MAINTENANCE .................................................................. 23

TROUBLESHOOTING GUIDE .................................................................................. 25

ACCESSORIES ..................................................................................................... 26

WARRANTYWARRANTY

WARRANTY

HI 9146 is state-of-the-art, heavy-duty DO meter, designed to provide

laboratory results and accuracy under harsh industrial conditions.

This instrument is provided with a series of new diagnostic features and

messages on the LCD which add an entirely new dimension to the

measurement of DO, by allowing the user to dramatically improve the

reliability of the measurement.

The Auto Endpoint feature automatically freezes the display when a

stable reading is reached.

Dissolved Oxygen is indicated in ppm (parts per million) or in %. All

measurements are automatically compensated for temperature. Salinity

compensation in water allows direct determination of Dissolved Oxygen in

saline waters and altitude compensation readjusts for the altitude variance.

The Dissolved Oxygen probe has a membrane covering the polarographic

sensors and a built-in thermistor for temperature measurements and

compensation. This permeable PTFE membrane isolates the sensor

elements from the testing solution, but allows Oxygen to pass through.

When a voltage is applied across the sensor, oxygen that has passed

through the membrane reacts causing a current flow, and hence

determining a reading.

The Battery Error Preventing System (BEPS) detects when the batteries

become too weak to ensure reliable measurements.

The backlight feature is automatically disabled when batteries are

getting low and a clear indication is displayed to warn the user of this

condition. However, the meter continues to measure correctly even when

the low battery indication is displayed. The meter automatically switches

itself off when the batteries are too weak to support proper function.

In addition, the meter allow the user to enter an ID code to uniquely

identify the instrument.

Remove the instrument from the packing material and examine it carefully

to make sure that no damage has occurred during shipping. If there is any

damage, notify your Dealer or the nearest Hanna Customer Service Center.

Each instrument is supplied with:

•HI 76407/2 DO probe with 2 m (6.7’) cable

•HI 76407A membarne cap (2 pcs.)

•HI 7041S electrolyte solution (30 mL)

•3 x 1.5V AAA, Batteries

•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 in the

original packing with the supplied accessories.

PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION

PRELIMINARY EXAMINATION

GENERAL DESCRIPTIONGENERAL DESCRIPTION

GENERAL DESCRIPTION

1. D.O. Probe

2. Protective Cap

3. Watertight Shielded Cable

4. Polypropylene Probe Body

5. Temperature Sensor

6. O-Ring Seal

7. Silver Chloride Anode

8. Platinum Cathode (sensor)

9. Oxygen Permeable PTFE Membrane

10. Membrane Cap

PROBE FUNCTIONAL DESCRIPTIONPROBE FUNCTIONAL DESCRIPTION

PROBE FUNCTIONAL DESCRIPTION

1) Liquid Crystal Display (LCD).

2) Range key, to select ppm or % range.

3) On/Off key, to turn the instrument ON and OFF.

4) CAL key, to enter/exit calibration mode.

5) Setup key, to enter/exit SETUP mode.

6) key, to manually increase temperature or other parameters.

7) Battery compartment cap.

8) DIN connector for DO probe.

9) key, to manually decrease temperature or other parameters.

METER FUNCTIONAL DESCRIPTIONMETER FUNCTIONAL DESCRIPTION

METER FUNCTIONAL DESCRIPTION

10) GLP key, to display Good Laboratory Practice information.

CFM key, to confirm different values.

11) AutoEnd key, to freeze first stable reading on the LCD.

12) Light key, to toggle display backlighting.

13) Secondary LCD.

14) Primary LCD.

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SPECIFICATIONSSPECIFICATIONS

SPECIFICATIONS

INITIAL PREPARATION

The instrument is supplied complete with batteries. In order to place the

batteries inside the instrument follow the instructions from page 21.

To take measurements, connect the DO 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.

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 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

supplied in the kit with the meter)

with electrolyte solution while shaking

it gently. Refill with clean electrolyte

solution.

4. Tap gently the sides of the membrane

cap with your finger tip to ensure that

no air bubbles are trapped. To avoid

damaging the membrane, do not tap

it directly on the bottom.

5. Make sure that the rubber 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 polarization

(see page 9), use the protective transparent

cap supplied in the kit with the meter.

Shipping

cap

black

red

FILL FIRST

THEN TAP

THEN SCREW

BACK ON

OPERATIONAL GUIDEOPERATIONAL GUIDE

OPERATIONAL GUIDE

Turn the instrument ON by pressing On/Off.

At start-up the display will show all

the used segments for a few seconds

(or while the button is held), followed

by the percentage indication of the

remaining battery life.

•After a few seconds “Cond” message

appears, the “ ” and “WAIT” tags will

blink on the LCD if probe is connected

to inform the user that the probe is in

auto-conditioning (automatic polarization)

mode.

•When this message disappears, the probe

is polarized and the instrument can be

calibrated.

•The meter is now ready to operate.

•If the probe is disconnected or broken, the

meter will display “----” and “NO Probe”

tag blinking. In this situation only SETUP

menu is available.

The auto-off feature turns the instrument off

after a set period (default 20 min) with no

button pressed to save battery life. To set

another period or to disable this feature, see SETUP menu on page 17.

The auto-off backlight feature turns the backlight off after a set period

(default 1 min) with no buttons pressed. To set another period or to

disable this feature, see SETUP menu on page 17.

PROBE POLARIZATION

The probe is under polarization with a fixed voltage of approximately

800 mV.

Probe polarization is essential for stable measurements with the same

recurring degree of accuracy.

With the probe properly polarized, oxygen is continually consumed

when it passes through the sensitive diaphragm and dissolves in the

electrolyte solution contained in the probe.

If polarization 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 revealed is both that of the tested solution, as well as that

present in the electrolyte solution. This reading is incorrect.

Keep the protective cap on during polarization time and remove it for

calibration and measurements.

Note:If the probe is changed while the instrumen is ON, a conditioning

period is started.

SALINITY AND ALTITUDE COMPENSATION

If the sample contains significant concentration of salinity or if you are

performing measurements at an altitude different from sea level, the

read out values must be corrected, taking into account the lower degree

of oxygen solubility in these situations (see pages 18-19).

Remember to set the altitude and/or the salinity before taking any DO

measurements. The meter will automatically compensate for these factors.

DO MEASUREMENTS

Make sure that the instrument has been

calibrated and the protective cap has been

removed.

•Immerse the tip of the probe in the sample

to be tested. Allow approximately one

minute for the reading to stabilize.

•The Dissolved Oxygen value (in ppm) is

displayed on the primary LCD and the

temperature on the secondary LCD.

•Press RANGE to change the reading from

ppm to % and vice-versa.

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