Hanna Instruments HI 9141 User Manual

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Instruction Manual

HI 9141 - HI 91410

Portable

Printing and Logging

Dissolved Oxygen Meters

HI 91410

MICROPROCESSORLOGGING DISSOLVEDOXYGEN METER

RANGE

0. . . 19.99ppm

ON/OFF

FUNC

CAL

These Instruments are in Compliance with the CE Directives

PAPER

TIO

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 precise idea of its versatility in a wide range of applications.

These instruments are in compliance with directives EN 50081-1 and 50082-1.

TABLE OF CONTENTSTABLE OF CONTENTS

TABLE OF CONTENTS

TABLE OF CONTENTSTABLE OF CONTENTS

Preliminary Examination............................. 1

General Description .................................... 1

Functional Description Probe...................... 3

Functional Description HI9141 ................... 4

Functional Description HI91410.................. 5

Specifications ............................................. 6

Initial Preparation........................................ 7

Calibration ................................................... 9

Taking Measurements .............................. 11

Setting Date, Time, Printing Interval ......... 13

Printing / Recording with HI9141.............. 17

Printing / Logging with HI91410 ............... 19

Altitude Compensation.............................. 23

Salinity Compensation.............................. 24

Temperature Compensation ...................... 24

Probe & Membrane Maintenance ............. 25

Data Transfer to PC.................................. 2 7

Fault Functions ........................................ 29

Memory Organization (HI91410 only) ....... 30

Printer Maintenance.................................. 31

Battery Replacement ................................ 33

Accessories .............................................. 35

Warranty ................................................... 36

CE Declaration of Conformity ................... 37

http://www.hannainst.com

ISO 9000 Certified Company since 1992

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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 Printing D.O. meter is supplied complete with:

• 1.5V AA size batteries (4 pieces)

• DO Probe with 4 m/13' cable (HI 76407/4)

• Membrane cap, 2 pieces (HI 76407A)

• Electrolyte solution, 30 ml (HI 7041S)

• Paper rolls, 5 pieces

• 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.

GENERAL DESCRIPTION

The HI 9141 and HI 91410 are portable, microprocessor-based, printing (and logging HI 91410 only) meters for Dissolved Oxygen measurements.

Housed in a rugged and lightweight case, with an easy-to-read LCD, they are the first portable D.O. meters in their category to incorporate a printer. The printer uses plain, non-fading paper.

They are capable of storing up to 8,000 readings. These readings can be printed and/or transferred to a computer system for elaboration or permanent storage (HI 91410 only). An optional HI 9200 infrared transmitter can be used to interface the HI 91410 to a com- puter for data transfer.

Dissolved oxygen and temperature measurements can be performed with lab-grade preci-

sion in the field (wastewater treatment, fishfarming, water analysis, etc.) as well as in the laboratory without compromising accuracy.

Dissolved oxygen is indicated in ppm (parts per million).

Temperature is compensated for by the meter's ATC circuitry. Salinity compensation in water allows direct determination of dissolved oxygen in saline waters and the altitude compensation readjusts for the altitude variance.

The dissolved oxygen probe has a membrane covering the polarographic sensors and a builtin thermistor for temperature measurements and compensation. This permeable PTFE 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 a current flow.

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ON/OFF

PAPER

FUNCTION UP

DOWN

CAL

RECORD

7 8

4 5

MICROPROCESSORPRINTING DISSOLVEDOXYGEN METER

HI 9141

RANGE

O20. . . 19.99ppm

°C 0. . . +50.0°C

FUNCTIONAL DESCRIPTION PROBE

7 8

FUNCTIONAL DESCRIPTION HI9141

1. Probe connector and socket for adapter

2. UP key, to set date, time, printing interval, values for altitude and salinity compensation

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

3. DOWN key, to set date, time, printing interval, values for altitude and salinity compensation

4. PRINT key, to obtain a printout

5. RECORD key, to enter the recording mode

6. Liquid Crystal Display

7. PAPER key, to move the paper up

8. ON/OFF key, to turn the meter on or off

9. FUNCTION key, to select the D.O. or temperature mode and for compensation selection

10. CAL key, to enter or exit calibration mode.

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FUNCTIONAL DESCRIPTION HI91410

HI 91410

MICROPROCESSOR LOGGING DISSOLVEDOXYGEN METER

1. Probe connector and socket for adapter

2. UP key, to set date, time, printing interval, values for altitude and salinity compensation

3. DOWN key, to set date, time, printing interval, values for altitude and salinity compensation

4. PRINT key, to obtain a printout

5. LOG key, to enter or exit the logging mode

6. Liquid Crystal Display

7. PAPER key, to move the paper up

8. ON/OFF key, to turn the meter on or off

9. FUNCTION key, to select the D.O. or temperature mode and for compensation selection

10. CAL key, to enter or exit calibration mode.

ON/OFF

FUNCTION UP

CAL

PAPER

RANGE

O20. . . 19.99ppm °C 0. . . +50.0°C

DOWN

LOG

SPECIFICATIONS HI9141 & HI91410

Range DO 0.00 to 19.99 ppm

Resolution DO 0.01 ppm

Accuracy DO 1.5% of full scale

Typical EMC DO ±0.6 ppm Deviation Temp. ±3°C

Calibration Automatic in saturated air

Temperature Automatic from 0 to 30°C Compensation (32 to 86°F)

2 3 4 5

Altitude Compensation 0 to 1,900 m (6,230')

Salinity Compensation 0 to 40 g/l

Power Supply 4 x 1.5V AA batteries,

Printer Low-power impact type belt,

Printing /Logging 1, 2, 5, 10, 15, 30, Interval 60, 120, 180 minutes

Environment 0 to 50°C; 95% RH Dimensions 220 x 82 x 66 mm

Shipping Weight 1.7 kg (3.8 lb.) Response Time The response time is about 20

Temp. 0.0 to 50.0°C

Temp. 0.1°C

Temp. ±0.5 °C

at 100%

Resolution 100 m (328')

Resolution 1 g/l

approx. 70 hours of life;

Auto shut-off after 4 hours.

Power socket for

12VDC adapter

14 characters per line using 38mm plain paper

(8.7 x 3.2 x 2.6")

seconds for a 95% reading at a constant temperature of 25°C. The response time for low oxygen readings or at low temperature is approximately 40 seconds. Allow more time to obtain more accurate readings.

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INITIAL PREPARATION

Each meter is supplied complete with batteries. Remove the back cover, unwrap the batteries and install them while paying attention to the polarity (see also page 33).

To prepare the instrument for use, connect the D.O. probe to the meter securely by aligning the pins with the socket located on the top of the meter, pushing the plug in and tightening the threaded ring. Follow the "Initial Probe Preparation" procedure explained on page 8.

To switch the meter on, press the ON/OFF key and "Cond" appears on the display to inform that the probe is in the auto-conditioning (polarization) mode. Once the "Cond" disappears, the instrument can be calibrated (see page 9).

ON/OFF

If the probe is disconnected, the meter will display "°C ---.-" and print "---- ppm" and "----°C" to alert the user.

°C

This also indicates the possibility of a broken probe cable.

To maximize battery life, the display is automatically switched off after 4 hours of nonuse. However, the meter will continue to monitor dissolved oxygen and temperature (if in the recording/logging mode) .

0009 *00.50

14-01-96

---- ppm

---- ° C

INITIAL 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 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. Gently tap the sides of the membrane cap 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 properly inside the membrane cap.

6. With the sensor facing down, slowly screw the cap clockwise. Some electrolyte will overflow.

When not in use, place the protective cap supplied in the kit with the meter.

FILL FIRST

THEN TAP

hipping

cap

black

red

THEN SCREW

BACK ON

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CALIBRATION

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.

The calibration of this instrument is very simple and is recommended every time the meter is turned on.

• Make sure the probe is ready for measurements (see page 8), i.e. the membrane cap is filled with electrolyte and the probe is connected to the meter and properly polarized.

• Switch the meter on by pressing the ON/ OFF key and "Cond" appears on the display to inform that the probe is in autoconditioning (polarization) mode.

ON/OFF

• Once the "Cond" disappears, the instrument can be calibrated.

• For an accurate calibration, it is recommended to wait for 5 or 10 minutes to ensure precise conditioning of the probe.

• Remove the protective cap.

• Press the CAL key. "CAL" appears on the

primary display to indicate that the instrument is in calibration mode.

CAL

• The instrument will automatically standardize itself to the actual saturation value and after approximately 1 minute will show the value in ppm corresponding to the maximum oxygen level soluble in water at that particular temperature and at the conditions of altitude and salinity previously set. Once the value in ppm is displayed, the calibration is completed.

• Press the FUNCTION key and make sure F1 and F2 are set to the appropriate altitude and salinity values (see pages 23-24).

Notes: • The instrument must also be cali-

brated whenever the probe, the membrane or the electrolyte solution are changed.

• If you want to exit the calibration mode during the calibration, press the CAL key again.

FUNCTION

CAL

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