Hanna Instruments HI 98160 Manual de usuario

Instruction Manual

HI 98160

Portable Waterproof

Microprocessor

Logging GLP

pH / ORP Meter

www.hannainst.com

ON / OFF

ALT

LIGHT

HI 98160

Microprocessor Logging pH/ORP Meter

LOG

RANGE CAL

MAN98160R1 09/04

SALES AND TECHNICAL SERVICE CONTACTS

Australia:

Tel. (03) 9769.0666 • Fax (03) 9769.0699

China:

Tel. (10) 88570068 • Fax (10) 88570060

Egypt:

Tel. & Fax (02) 2758.683

Germany:

Tel. (07851) 9129-0 • Fax (07851) 9129-99

Greece:

Tel. (210) 823.5192 • Fax (210) 884.0210

Indonesia:

Tel. (21) 4584.2941 • Fax (21) 4584.2942

Japan:

Tel. (03) 3258.9565 • Fax (03) 3258.9567

Korea:

Tel. (02) 2278.5147 • Fax (02) 2264.1729

Malaysia:

Tel. (603) 5638.9940 • Fax (603) 5638.9829

Singapore:

Tel. 6296.7118 • Fax 6291.6906

South Africa:

Tel. (011) 615.6076 • Fax (011) 615.8582

Taiwan:

Tel. 886.2.2739.3014 • Fax 886.2.2739.2983

Thailand:

Tel. (662) 619.0708.11 • Fax (662) 619.0061

United Kingdom:

Tel. (01525) 850.855 • Fax (01525) 853.668

USA:

Tel. (401) 765.7500 • Fax (401) 765.7575

For e-mail contacts and a complete list of Sales and

Technical offices, please see www.hannainst.com.

Dear Customer,

Thank you for choosing a Hanna Instruments Product.

Please read this instruction manual carefully before using the instru-

ment.

This manual will provide you with all the necessary information for the

correct use of the instrument, as well as a 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 [email protected]

This instrument is in compliance with the directives.

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

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

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

SPECIFICATIONS .................................................................................. 6

INITIAL PREPARATION .............................................................................. 7

SETUP MODE .................................................................................. 8

TAKING pH MEASUREMENTS ................................................................. 11

TAKING ORP MEASUREMENTS ............................................................... 12

TAKING TEMPERATURE MEASUREMENTS ................................................ 12

AUTO ENDPOINT MODE ........................................................................ 13

pH CALIBRATION PROCEDURE ............................................................... 13

ELECTRODE CONDITION ........................................................................ 16

mV CALIBRATION PROCEDURE .............................................................. 16

TEMPERATURE CALIBRATION PROCEDURE .............................................. 17

LOGGING FUNCTION ............................................................................. 18

GOOD LABORATORY PRACTICE (GLP) ..................................................... 20

LCD BACKLIGHT ............................................................................... 22

DATA TRANSFER TO PC ......................................................................... 22

BATTERY REPLACEMENT ....................................................................... 24

TEMPERATURE CORRELATION FOR HANNA pH SENSITIVE GLASS ................ 25

ELECTRODE CONDITIONING AND MAINTENANCE ...................................... 26

ACCESSORIES ...................................................................................... 29

WARRANTY ......................................................................................... 31

TABLE OF CONTENTS

Recommendations for Users

Beforeusingthisproduct,makesurethatitisentirelysuitablefortheenvironmentin

whichitisused.Operationofthisinstrumentinresidentialareacouldcauseunaccept-

able interferences to radio and TV equipments, requiring the operator to take all

necessarystepstocorrectinterferences.

Theglassbulbattheendoftheelectrodeissensitivetoelectrostaticdischarges.Avoid

touchingthisglassbulbatalltime.Duringcalibrationofinstruments,ESDwriststraps

shouldbeworntoavoidpossibledamagetotheelectrodebyelectrostaticdischarge.

Any variation introduced by the user to the supplied equipment may degrade the

instrument'sEMCperformance.

To avoid electrical shock, do not use these instruments when voltages at the

measurement surface exceed 24VAC or 60 VDC.

Toavoiddamages orburns,do notperformany measurementinmicrowave ovens.

WARRANTY

All Hanna Instruments meters are warranted for two years

against defects in workmanship and materials when used for their

intended purpose and maintained according to instructions.

Electrodes and probes are warranted for a period of six

months.

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 Cus-

tomer Service department and then send it with shipping costs

prepaid. When shipping any instrument, make sure it is properly

packaged for complete protection.

Hanna Instruments reserves the right to modify the design, con-

struction and appearance of its products without advance notice.

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.

Each meter is supplied complete with:

•HI1230B/C pH electrode, double junction, plastic body, BNC

connector with protective sleeve, 1 m (3.3') cable

•HI7662 temperature probe with 1 m (3.3') cable

•HI70004 pH 4.01 buffer solution, 20 ml sachet (1 pc)

•HI70007 pH 7.01 buffer solution, 20 ml sachet (1 pc)

•Instruction manual

•1.5V AA size alkaline batteries (4 pcs)

•Rugged carrying case.

Note: Save all packing material until you are sure that the

instrument functions correctly. All defective items must be

returned in their original packaging together with the sup-

plied accessories.

HI98160is a portable logging microprocessor-based pH/ORP/tempera-

ture meter.

All pH measurements are automatically compensated for temperature

(ATC or MTC). The instrument housing is made of rugged, lightweight

material, making it truly portable.

Eight memorized buffers (1.68, 3.00, 4.01, 6.86, 7.01, 9.18, 10.01

and 12.45 pH) and wrong buffer recognition technology make pH

calibration simple and error free. One or two-point procedure can be

performed.

The meter is also equipped with a stability indicator and backlight

feature for comfortable reading even in excessively dark environments.

An user friendly interface provides clear messages regarding errors,

functions and more.

The GLP features provide a guarantee of data consistency.

Measurements can be performed with lab-grade precision in the field as

well as in the laboratory.

An alarm time-out is available to alert the user if too much time has

elapsed since the last pH calibration and that re-calibration may be

required.

PRELIMINARY EXAMINATION

GENERAL DESCRIPTION

HI 2031B Glass-body, semimicro, conic tip, refillable

FC 100B Plastic-body (Kynar®), double junction, refillable, for

food industry.

FC 200B Plastic-body (Kynar®), single junction, conic, Viscolene,

non-refillable, for meat & cheese.

FC 210B Glass-body, double junction, conic, Viscolene, non-

refillable, for milk & yogurt.

FC 220B Glass-body, triple ceramic, single junction, refillable, for

food processing.

FC 911B Plastic-body (Kynar®), double junction, refillable with

built-in amplifier

HI 1413B Glass-body, single junction, flat tip, Viscolene for sur-

face measurement.

ORP ELECTRODES (with BNC connector & 1 m cable)

HI 3131B Glass-body, refillable, Pt sensor

HI 3230B Plastic-body (Ultem®), gel-filled, Pt sensor

HI 4430B Plastic-body (Ultem®), gel-filled, Gold sensor

OTHER ACCESSORIES

HI 710031 Rugged carrying case

HI 740027 1.5V AA size alkaline batteries (4 pcs)

HI 76405 Electrode holder

HI 7662 Temperature probe with 1 m (3.3') cable

HI 8427 pH and mV simulator

HI 931001 pH and mV simulator with display

HI 920011 5 to 9-pin cable for connection to PC

Kynar®is registered Trademark of "Pennwalt Corp."

Ultem®is registered Trademark of "General Electrics Co."

The meter provides a controlled access to calibration and GLP settings

through a password protection method.

The Battery Error Preventing System (BEPS) recognizes batteries level

and automatically switches the meter off when batteries are too weak

to support proper function.

To prolong battery life, the backlight feature is automatically disabled

when the batteries are getting low; a clear indication is displayed on

LCD to warn the user of this condition. However, the meter continues

to measure correctly even when the low battery indication is dis-

played.

The meter can store measurementsin memory upon user request for

retrieval at a later time.

HI98160 also allows transfer of data to computer through the RS232

interface.

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

identify the instrument.

Made of tough, lightweight ABS material, the water-resistant rugged

casing is built to last.

The meter is in compliance with IP67 standards: dust-tight, pro-

tected against the effects of temporary immersion in water and

designed to provide laboratory results and accuracy under harsh

industrial conditions.

ACCESSORIES

pH CALIBRATION SOLUTIONS

HI 70004P pH 4.01 Buffer Sachets, 20 ml sachet, 25 pcs

HI 70007P pH 7.01 Buffer Sachets, 20 ml sachet, 25 pcs

HI 70010P pH 10.01 Buffer Sachets, 20 ml sachet, 25 pcs

HI 7001M pH 1.68 Buffer Solution, 230 ml

HI 7004L pH 4.01 Buffer Solution, 500 ml

HI 7006L pH 6.86 Buffer Solution, 500 ml

HI 7007L pH 7.01 Buffer Solution, 500 ml

HI 7009L pH 9.18 Buffer Solution, 500 ml

HI 7010L pH 10.01 Buffer Solution, 500 ml

ELECTRODE STORAGE & CLEANING SOLUTIONS

HI 70000P Electrode Cleaning Sachets, 20 ml sachet, 25 pcs

HI 70300L Storage Solution, 460 ml

HI 7061L General Cleaning Solution, 460 ml

HI 7073L Protein Cleaning Solution, 460 ml

HI 7074L Inorganic Cleaning Solution, 460 ml

HI 7077L Oil & Fat Cleaning Solution, 460 ml

REFILL ELECTROLYTE SOLUTIONS

HI 7071 3.5M KCl + AgCl Electrolyte, 4x50 ml

HI 7072 1M KNO3Electrolyte, 4x50 ml

HI 7082 3.5M KCl Electrolyte, 4x50 ml, for double junction electrodes

ORP PRETREATMENT SOLUTIONS

HI 7091L Reducing Pretreatment Solution, 460 ml

HI 7092L Oxidizing Pretreatment Solution, 460 ml

pH ELECTRODES (with BNC connector & 1 m cable)

HI 1230B/C Plastic-body (Ultem®), double junction, gel-filled, BNC

protective sleeve

HI 1230B Plastic-body (Ultem®), double junction, gel-filled

HI 1043B Glass-body, double junction, refillable, combination

HI 1053B Glass-body, triple ceramic, conic shape, refillable,

HI 1083B Glass-body, micro, Viscolene

HI 1131B Glass-body, single junction, refillable

HI 1330B Glass-body, semimicro, single junction, refillable

HI 1331B Glass-body, semimicro, single junction, refillable

HI 1332B Plastic-body (Ultem®), double junction, refillable

Ultem®is registered Trademark of "General Electrics Co."

FUNCTIONAL DESCRIPTION

1) Socket for temperature probe

2) RS232 connector

3) BNC connector for pH electrode

4) Liquid Crystal Display (LCD)

5) ON/OFF key, to turn the meter on and off

6) ALT key, to alternate key function

7) RANGE / GLP key, to select measurement ranges, to display time

and date, and to view calibration data (with ALT)

8)CAL / AutoEnd key, to enter pH calibration mode or (with ALT)

to enter Auto Endpoint mode

9) / CFM key, to move down or confirm values (with ALT)

10) LOG / RCL key, to store or recall measurements (with ALT)

11) /FNC key, to move up or enter setup mode (with ALT)

12)LIGHT / DEL key, to turn the LCD backlight on and off and to

delete stored data (with ALT)

ON / OFF

ALT

LIGHT

HI 98160

Microprocessor Logging pH/ORP Meter

LOG

RANGE CAL

For refillable electrodes:

Refill it with fresh electrolyte (HI7071 for single junction or HI7082 for

double junction). Allow the electrode to stand upright for 1 hour.

Follow the Storage Procedure above.

CLEANING PROCEDURE

General Soak in Hanna HI7061 General Cleaning Solution for

approximately 1 hour.

Removal of films, dirt or deposits on the membrane/junction:

- Protein Soak in Hanna HI7073 Protein Cleaning

Solution for 15 minutes.

- Inorganic Soak in Hanna HI7074 Inorganic Cleaning

Solution for 15 minutes.

- Oil/grease Rinse with Hanna HI7077 Oil and Fat Cleaning

Solution.

IMPORTANT: After performing any of the cleaning procedures rinse

the electrode thoroughly with distilled water, drain and refill the

reference chamber with fresh electrolyte, (not necessary for GEL filled

electrodes) and soak the electrode in HI70300 Storage Solution for

at least 1 hour before taking measurements.

TROUBLESHOOTING

Evaluate your electrode performance based on the following possibilities.

•Noise (Readings fluctuate up and down) could be due to:

-Clogged/Dirty Junction: Refer to the Cleaning Procedure above.

-Loss of shielding due to low electrolyte level (in refillable

electrodes only): refill with fresh HI7071 for single junction or

HI7082 for double junction electrodes.

•Dry Membrane/Junction: Soak in Storage Solution HI70300

for at least 1 hour.

•Drifting: Soak the electrode tip in warm Hanna Solution

HI7082 for one hour then flush tip with distilled water. Refill with

fresh HI7071 for single junction electrodes and HI7082 for double

junction electrodes.

•Low Slope: Refer to the cleaning procedure above.

•No Slope: Check the electrode for cracks in glass stem or bulb

and replace the electrode.

•Slow Response/Excessive Drift: Soak the tip in Hanna Solu-

tion HI7061 for 30 minutes, rinse thoroughly in distilled water

and then follow the Cleaning Procedure above.

SPECIFICATIONS

Range pH –4.00 to 19.99 pH

mV ±600.0 mV

±2000 mV autoranging

Temp. –20 to 120 °C

Resolution pH 0.01 pH

mV 0.1 mV within ±400mV

0.2 mV from +400 to +600mV

0.2 mV from -400 to -600mV

1 mV outside

Temp. 0.1°C from -10 to 120 °C / 1°C below -10°C

Accuracy pH ±0.01 pH

(@20°C/68°F) mV ±0.2mV within ±400mV

±0.4mV from +400 to +600mV

±0.4mV from -400 to -600mV

±2mV outside

Temp. ±0.2°C from 0 to 70°C / ±1°C outside

Typical EMC pH ±0.02 pH

Deviation mV ±1mV within±600mV

±2 mV outside

Temp. ±0.4°C

pH Calibration Automatic, at 1 or 2 points with 8 memorized

buffers (1.68, 3.00, 4.01, 6.86, 7.01, 9.18,

10.01, 12.45 pH)

mV Calibration Automatic, 2 points at 0 and 350 mV, or

3 points at 0, 350 and 1900 mV

Temperature Automatic or Manual

Compensation between -20 and 120°C or

pH Electrode HI 1230B/C, double junction, BNC connector

with protective sleeve (included)

Temperature probe HI 7662 (included)

Input Impedance 1012 Ohm

Power supply 4x1.5V AA size alkaline batteries;

approx. 400 hours (without backlight)

Casing IP 67

Environment 0 to 50°C / 100% RH

Dimensions 196 x 80 x 60 mm (7.7 x 3.1 x 2.4")

Weight 500 g (18 oz.)

PREPARATION

Remove the protective cap.

DO NOT BE ALARMED IF SALT DEPOSITS ARE PRESENT. This is normal

with electrodes and they will disappear when rinsed with water.

During transport tiny bubbles of air may form inside the glass bulb.

The electrode cannot function properly under these conditions. These

bubbles can be removed by "shaking down" the electrode as you

would do with a glass thermometer.

If the bulb and/or junction are dry, soak the electrode in HI70300

Storage Solution for at least one hour.

For refillable electrodes:

If the fill solution (electrolyte) is less than 1 cm (½") below the fill

hole, add HI7082 3,5M KCl Electrolyte Solution for double junc-

tion or HI7071 3,5M KCl+AgCl Electrolyte Solution for single

junction electrodes.

For a faster response unscrew the fill hole screw during measurements.

For AmpHel electrodes:

If the electrode does not respond to pH changes, the battery is run

down and the electrode should be replaced.

MEASUREMENT

Rinse the electrode tip with distilled water.

Immerse the tip (4 cm /1½") in the sample and stir gently for

approx. 30 seconds. For a faster response and to avoid cross

contamination of the samples, rinse the electrode tip with a few drops

of the solution to be tested, before taking measurements.

STORAGE

To minimize clogging and ensure a quick response time, the glass bulb

and the junction should be kept moist and not allowed to dry out.

Replace solution in the protective cap with a few drops of HI70300 or

HI80300 Storage Solution or, in its absence, Filling Solution

(HI7071 for single junction or HI7082 for double junction electrodes).

Follow the Preparation Procedure above before taking measurements.

Note: NEVER STORE THE ELECTRODE IN DISTILLED WATER OR DRY.

PERIODIC MAINTENANCE

Inspect the electrode and the cable. The cable used for connection to

the meter must be intact and there must be no points of broken

insulation on the cable or cracks on the electrode stem or bulb.

Connectors must be perfectly clean and dry.

If any scratches or cracks are present, replace the electrode.

Rinse off any salt deposits with water.

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.

To prepare the instrument for use, connect the pH (or ORP) electrode

and the temperature probe to the connectors located on the top of

the instrument.

In order to achieve the maximum protec-

tion against vapors and humidity, the

BNC connector of the supplied pH electrode

HI1230B/C is shielded behind a water-

proof sheath.

Slide the protective sheath down; connect

the HI1230B/C pH electrode to the instru-

ment and then slide the protective sheath

back. Since the protective sheath is rub-

berized and to ensure maximum waterproof

protection, make sure the connector is com-

pletely covered.

To switch the meter on, press the ON/OFF

key. The batteries charge status will be

displayed on the LCD for a few seconds.

The meter is now ready to operate.

To maximize battery life, the meter is automatically switched off after 5

minutes of non-use (this feature is enabled by default and can be

disabled through setup code "AOF"). To reactivate the instrument

press the ON/OFF key.

Before proceeding with pH measurements follow the pH calibration

procedure.

Note: When the use of an alternate function (DEL, FNC, CFM, GLP,

RCL and AutoEnd) is requested, press and hold the ALT key

first and then the second listed key.

Note: To prevent damages to the electrode, remove it from the

sample before turning the meter off.

If the meter is off, detach the electrode from the meter before

immersing it in the storage solution.

ON / OFF

Note: To prevent damage to the electrode, remove the pH electrode

from the sample before turning the meter off.

If the meter is off, detach the electrode from the meter before

immersing the electrode in the storage solution.

ELECTRODE CONDITIONING

AND MAINTENANCE

Setup can be used to view data regarding instrument status (e.g.

battery charge) or to change the meter parameters (e.g. time).

•To enter this mode press the ALT and

FNC keys when the meter is in measure-

ment mode.

•The setup code "tC" will blink on the

lower LCD and "SEt" will be displayed on

the upper one.

•Select the code of the desired

parameter using the arrow keys.

•Press the ALT and CFM keys to confirm

the code.

Note: If the ALT and FNC keys are pressed before code confirmation,

the meter will return to measurement mode.

•If the selected parameter is password protected, the lower LCD will

display "PAS" and the password must be entered to proceed.

Otherwise, the current parameter value will be displayed.

PASSWORD PROTECTION

Setting time, date and calibration alarm time-out are password

protected and the user will be asked to enter the password to change

these parameters. After code confirmation the upper LCD will display

"0000".

•If password is set to 0000 (factory setting), just press the ALT and

CFM keys to confirm.

•If password is set to a value different from 0000, enter the

password with the up and down arrow keys and then press the

ALT and CFM keys to confirm.

•If password is incorrect the meter displays the "WRONG" indication

and asks for the password again.

•If password is correct, the meter provides access to all parameters.

SETUP MODE

FNC

ALT

GLP

FNC

CFM

RANGE

FNC CFM

Alkaline Error

1.0 Mol L-1 Na+

0.1 Mol L-1 Na+

Sodium Ion Correction for the Glass at 20-25°C

Concentration pH Error

13.00

13.50

14.00

12.50

13.00

13.50

14.00

0.10

0.14

0.20

0.10

0.18

0.29

0.40

TEMPERATURE-RESISTANCE CORRELATION FOR

HANNA pH SENSITIVE GLASS

The resistance of glass electrodes partially depends on the temperature.

The lower the temperature, the higher the resistance. It takes longer time

for the reading to stabilize if the resistance is higher. In addition, the

response time will suffer to a greater degree at temperatures below 10°C.

Since the resistance of the pH electrode is in the range of 200 Mohm,

the current across the membrane is in the pico-Ampere range. Large

currents can disturb the calibration of the electrode for many hours.

For these reasons high humidity environments, short circuits and

static discharges are detrimental to a stable pH reading.

The pH electrode's life also depends on the temperature. If constantly

used at high temperatures, the electrode life is drastically reduced.

Typical Electrode Life

Ambient Temperature 1- 3 years

90 °C Less than 4 months

120°C Less than 1 month

High concentrations of sodium ions interfere with readings in alkaline

solutions; the pH at which the interference starts to be significant

depends upon the composition of the glass. This interference is the

alkaline error and causes the pH to be underestimated. Hanna's

glass formulations have the indicated characteristics.

-20 -20

-10

0 +10+20 +30 +40 +50 +60 +70 +80 +90 ° C

-10

Ω

-10

Ω

2x109

1x109

2x108

1x108

2x107

1x107

-20 -10 0 +10 +20+30+40 +50 +60 +70+80 +90 °C

PARAMETER SETTINGS

•Once the parameter code (and password

if needed) has been entered, the current

value of the selected parameter will be

displayed on the LCD together with the

parameter code. The parameter or a part of it will blink (e.g.

only the hour blinks if time has been selected).

•Enter the desired value using the arrow keys.

FNC CFM

•If there is another part of the parameter to be set (e.g. minutes

for the time), press RANGE and then enter the new value using

the arrow keys.

•Press the ALT and CFM keys to confirm the value.

•If the entered value is not accepted, "WRONG" will be displayed for

a few seconds and then the meter will ask for a correct value.

•If the confirmed value is accepted, the meter will pass to the next

parameter (asking for the password if it is protected).

Note: If the ALT and FNC keys are pressed before parameter value

confirmation, the meter will not update the parameter and

after escaping will ask for a new setup code.

The following setup items table lists the items code, their valid values

and the factory settings (defaults):

Item Description Valid values Default

tC Temperature compensation Atc, ntc Atc

ELC Electrode condition On, OFF On

dUE Calibration alarm time-out OFF, 1 to 15 days OFF

AOF Auto-Off On, OFF On

HOU Current time1hh:mm 00:00

dAt Current date1dd.mm 01.01

YEA Current year1YYYY 1998

Id Instrument ID code 0000 to 9999 0000

uEr Firmware version

CHr Battery level test

PAS Password20000 to 9999 0000

GLPRANGE

The meter can recognize different batteries charge levels.

1. Fully charged batteries - The backlight can be enabled.

2. Weakening batteries - The backlight is automatically disabled

and it is not possible to enable it until new batteries are inserted.

The "Batt" indication appears when trying to enable backlight.

The meter can work for about 10 hours.

3. Dead batteries - LCD shuts off. The instrument stops working to

avoid erroneous readings.

Battery replacement must only take

place in a non hazardous area using

1.5V alkaline AA type batteries.

In order to replace run down batteries,

simply remove the two screws on the

rear cover of the instrument and re-

place the four 1.5V AA batteries with

new ones, paying attention to the cor-

rect polarity.

BATTERY REPLACEMENT

At the end of the logged data the checksum (2 complement)

is sent.

Note: The meter will send <CAN> if a corrupted or unknown

command is received.

These commands may be sent with either capital or small letters.

Invalid commands will be ignored. The characters sent by the pH

meter are always capital letters.

1The meter automatically checks for entered time / date accuracy as follows:

0≤hh≤23; 0≤mm≤59; 01≤dd≤28/29/30/31; 1≤MM≤12; 1998≤YYYY≤2097.

2To change the password, the correct code must be entered first. If the password

has been forgotten, the password protected features are no longer accessible;

in this case contact your nearest Hanna Service Center.

Some of the setup parameters are explained below.

Item tC - Temperature Compensation

The temperature used for pH compensation can be:

- automatic reading from the probe (ATC).

- user defined (MTC)

Follow, the next steps to select the temperature source:

•Select item "tC".

•Select option: "Atc" or "ntc".

•Press ALT and CFM to confirm.

Note: If the "ntc" option has been selected, in pH measurement

mode the "°C" tag blinks and the temperature value can be

modified with the arrow keys.

Item ELC - Electrode Condition

Electrode condition provides information about the electrode's performance.

100 means a good electrode, a low value means a bad electrode. When

this value is below 10, the "bAd" message is displayed.

•Select item ELC.

•Select option: "On" or "OFF".

•Press ALT and CFM to confirm.

The electrode condition will be displayed while in pH or mV measurement

mode, alternatively with the temperature.

Note: The electrode condition value is displayed only if a two-point

procedure has been performed for pH calibration and the ELC

option is "On".

Item AOF - Auto-off

The auto-off time-out is fixed at 5 minutes.

•Select item AOF to enable / disable this feature.

Item Id - Setting the identification (ID) code

When using several identical meters it may be useful to uniquely

identify them by assigning an ID code to each meter.

•Select item Id.

SENDING COMMANDS FROM PC

With any terminal programs it is possible to remotely control your pH

meter. Connect the meter to the PC through the HI920011 cable,

start the terminal program and set the communication options as

follows: 8, N, 1, no flow control.

To send a command to the pH meter the scheme is:

The computer sends the command expressed as a 3-character se-

quence and a CR character.

Note:All the terminal programs that support the ANSI escape

sequence, represent the CR character with the string '^M'.

The available commands are as follows:

MOD - to request the firmware code of the meter.

GLP - to request the last calibration data.

The meter answers with the following order:

pH calibration status (0=not calibrated , 1=calibrated)

pH calibration date (ddmmyy)

pH calibration time (hhmm)

pH electrode offset

pH electrode slope

pH buffer 1

pH buffer 2

electrode condition

mV calibration status (0=not calibrated)

mV calibration date (ddmmyy)

mV calibration time (hhmm)

mV buffer 1

mV buffer 2

mV buffer 3

If an item is not available (e.g. buf 3 in case of a two points

mV calibration) the character "N" will be received.

PAR - to request the setup parameters setting.

The meter answers with a 6-character string for each parameter.

LTB - to request the number of logged samples.

LOD - to request the logged data.

The meter answers with the following order:

status byte

date (ddmmyy)

time (hhmm)

pH reading (binary)

mV reading (binary)

temperature reading (binary)

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