Hanna instruments HI 98160 User Manual

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LIGHT

HI 98160

Microprocessor Logging pH/ORP Meter

LOG

RANGE CAL

SALES AND TECHNICAL SERVICE CONTACTS

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Germany:

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Instruction Manual

HI 98160

Portable Waterproof

Microprocessor

Logging GLP

Greece:

Tel. [phone] • Fax [phone]

Indonesia:

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Japan:

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Korea:

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Malaysia:

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Singapore:

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South Africa:

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Taiwan:

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USA:

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pH / ORP Meter

MAN98160R1 09/04

For e-mail contacts and a complete list of Sales and
Technical offices, please see www.hannainst.com.

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 [e-mail]

This instrument is in compliance with the directives.

TABLE OF CONTENTS

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

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 Cus­tomer 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, con­struction and appearance of its products without advance notice.

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 interferences to radio and TV equipments, requiring the operator to take all
necessary steps to correct interferences.
The glass bulb at the end of the electrode is sensitive to electrostatic discharges. Avoid
touching this glass bulb at all time. During calibration of instruments, ESD wrist straps
should be worn to avoid possible damage to the electrode by electrostatic discharge.
Any variation introduced by the user to the supplied equipment may degrade the
instrument's EMC performance.
To avoid electrical shock, do not use these instruments when voltages at the
measurement surface exceed 24VAC or 60 VDC.
To avoid damages or burns, do not perform any measurement in microwave ovens.

2

31

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

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

Kynar® is registered Trademark of "Pennwalt Corp."

PRELIMINARY EXAMINATION

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 sup­plied accessories.

GENERAL DESCRIPTION

HI98160 is a portable logging microprocessor-based pH/ORP/tempera­ture 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.

30

3

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 dis­played.

The meter can store measurements in 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 KNO3 Electrolyte, 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."

4

29

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 Solu­tion HI7061 for 30 minutes, rinse thoroughly in distilled water
and then follow the Cleaning Procedure above.

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)

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5

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 10
Power supply 4x1.5V AA size alkaline batteries;

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.)

12

Ohm

approx. 400 hours (without backlight)

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 junc­tion 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.

6

27

ON / OFF

ELECTRODE CONDITIONING

AND MAINTENANCE

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.

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 protec­tion against vapors and humidity, the
BNC connector of the supplied pH electrode
HI1230B/C is shielded behind a water­proof sheath.
Slide the protective sheath down; connect
the HI1230B/C pH electrode to the instru­ment and then slide the protective sheath
back. Since the protective sheath is rub­berized and to ensure maximum waterproof
protection, make sure the connector is com­pletely 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.

26

7

SETUP MODE

FNC

ALT

ALT

GLP

FNC

CFM

RANGE

FNC

CFM

-10

-10

-10

Ω

-10

-10

-10

-10

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 measure­ment 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.

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.

Ω

9

2x10

9

1x10

8

2x10

8

1x10

7

2x10

7

1x10

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

Alkaline Error

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

0.1 Mol L-1 Na

1.0 Mol L-1 Na

+

+

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

8

25

FNC

CFM

GLPRANGE

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.

BATTERY REPLACEMENT

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 re­place the four 1.5V AA batteries with
new ones, paying attention to the cor­rect polarity.

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.

• 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 time
dAt Current date
YEA Current year
Id Instrument ID code 0000 to 9999 0000
uEr Firmware version
CHr Battery level test
PAS Password

1

1

1

2

hh:mm 00:00
dd.mm 01.01
YYYY 1998

0000 to 9999 0000

24

9

1

The 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.

2

To 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:

<command> <CR>

The computer sends the command expressed as a 3-character se­quence 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)

10

23

ON / OFF

LIGHT DEL

ON / OFF

ALT

LIGHT

HI 98160

Microprocessor Logging pH/ORP Meter

LOG

RANGE CAL

• Press the RANGE key to scan remaining data, in the following order:
last calibration time
first calibration point
second calibration point
third calibration point

• The meter will then return to normal operating mode. Press the

ALT and GLP keys to escape before viewing all the data.

LCD BACKLIGHT

The LCD can be illuminated to allow the user to see the readings even
in dark environments.

It can be enabled/disabled through the LIGHT
key and it is automatically disabled when batter­ies are in low battery condition.

Two levels (low and high) of backlighting can be selected. Repeatedly
pressing the LIGHT key causes the lighting to cycle from off to low then
to high intensity.

Note: It is not possible to enable backlight in low battery condition;

the "Batt" indication will be displayed when trying to do so.

DATA TRANSFER TO PC

Before starting the serial communication, please put the meter in
measurement mode (pH or mV mode). Connect the meter to a PC
through the RS232 output (the connector is located on the top of the
meter). Use HI920011 (5 to 9-pin) connection cable.

SPECIFICATIONS:

Isolated 8-bit data transmission
Baud Rate: 2400
Start bit: 1
Stop bit: 1
Parity bit: none

• Enter a 4-digit value using the arrow keys.

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

Item CHr - Battery level test

• Select item CHr.

• The LCD will display "bAtt" and the remain­ing percentage of battery charge (100%
means fully charged battery and 0% corre­sponds to the minimum battery voltage
that allows the meter to operate).

Note: The battery level test is also performed each time the meter is

turned on.

TAKING pH MEASUREMENTS

Connect pH electrode and temperature probe
to the meter and press the ON/OFF key to
power on the instrument.

If necessary, press the RANGE key until the
display enters the pH mode.

For greatest accuracy, it is recommended to set
the calibration alarm time-out to the appro­priate value for the specific use and calibrate
the meter as soon as the "CAL" and "DATE"
symbols blink on LCD (see GLP section).

To take pH measurements, remove the elec­trode protective cap and simply submerge
the bottom 4 cm (1½") of the electrode and
the temperature probe in the solution to be
tested. Allow for the reading to stabilize.

Note: To better use the meter ATC capability, it is recommended to

position the temperature probe as close as possible to the pH
electrode.

The temperature is displayed on the lower LCD.
The pH reading is temperature compensated.
If the meter displays "----" the reading is out of range, while a

blinking reading means that the electrode is "dead".
By pressing the RANGE key the meter will switch between pH and mV

reading. The mV scale is autoranging: when the reading is outside
±600mV the decimal point automatically disappears.

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11

Note: If measurements are taken successively in different samples, it

ALT

GLPRANGE

is recommended to rinse the electrode thoroughly with deion­ized water or, if not available, tap water first and then with
some of the next sample to condition the electrode before
immersing it in the sample.

TAKING ORP MEASUREMENTS

Connect the ORP electrode to the meter and press the ON/OFF key.
To enter the mV mode, press RANGE until the display changes to mV.
To take ORP measurements, simply submerge the bottom 4 cm (1½")

of the ORP electrode in the solution to be tested, stir gently and allow
for the reading to stabilize.

Note: If measurements are taken successively in different samples, it

is recommended to rinse the electrode thoroughly with deion­ized water or if not available tap water first and then with
some of the next sample to condition the electrode before
immersing it in the sample to be tested.

TAKING TEMPERATURE MEASUREMENTS

Immerse the temperature probe in the solution (allow a few minutes
for the temperature to stabilize) and press the ON/OFF key. The
temperature is displayed in the lower LCD.

Note: If temperature measurement is out of range the LCD will

display " - - -".

Note: If manual temperature compensation is selected (see Setup

"tC"), the lower display will show the manual temperature
used to pH compensation.

Note: If no temperature probe is connected, the instrument auto-

matically switches to "Manual temperature compensation" working
mode.

from 01 to 15 days or disable this function by selecting OFF. The
default setting is OFF.

When turned on, the meter checks if the
time-out time has expired. If the time has
run out, the message "CAL duE" scrolls across
the LCD. The "CAL" and "DATE" symbols will
blink as a reminder.

Alarm time-out is also signaled when viewing logged data through
the "Cal" and "Due" message.

GLP AND RS232

All the GLP data can be retrieved (if the electrode is connected) from
a PC through the RS232 communication feature. The calibration data
are transferred to the PC along with measurement data (see "Data
transfer to PC" section).

LAST CALIBRATION DATA

Last calibration data are stored automatically after a successful
calibration and they can be displayed by pressing the GLP key.

To view pH calibration data

• Press the ALT and GLP keys when the
meter displays pH reading.

• The LCD will then display the electrode
condition if available. If electrode condi­tion is not available or by pressing the
RANGE key, the meter will display the last pH calibration date.

• Press RANGE key to scan remaining data, in the following order:

- last calibration time

- electrode offset value in mV ("OFF" appears in the lower LCD)

- electrode slope in mV/pH ("SLP" appears in the lower LCD)

- first point calibration buffer

- second point calibration buffer (only if a 2-point calibration has
been performed).

If calibration was performed with an old or dead probe, the
message "Old probe" or "Dead probe" will scroll on LCD.

• The meter will then return to normal operating mode. Press the
ALT and GLP keys to escape before viewing all the data.

To view mV calibration data

• Press the ALT and GLP keys when the meter displays mV reading.

• The LCD will then display the last mV calibration date.

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21

Note: Press the ALT and DEL keys to escape without data deletion.
When viewing through the logged data, the "NUL" message will be

displayed when selecting a deleted sample.

To delete all data in memory:

• Press the ALT and DEL keys while in
normal operating mode. The "del All"
message will appear on the LCD and the
"CFM" indication will start blinking ask­ing for confirmation.

• Press the ALT and CFM keys to confirm deletion.

Note: Press the ALT and DEL keys to escape without data deletion.
Note: If no samples are stored in memory and a deletion is

attempted, the meter will show the message "Zero" and then
returns to normal operating mode.

GOOD LABORATORY PRACTICE (GLP)

GLP is a set of functions that allows the storage or retrieval (when
necessary) of data regarding the maintenance and status of the
electrode.

PROBE LIFE VERIFICATION

At the end of calibration, the meter checks if offset is between -30 and
+30 mV and the slope between 53.5 and 62 mV/pH. If the values
are not within these boundaries, the message "old probe" scrolls across
the LCD. The electrode is still working, but it will be necessary to perform
a cleaning procedure (see electrode cleaning and maintenance sec­tion) or replace it.

If the offset is outside the -60 and +60 mV range or the slope is
outside the 40 to 70 mV/pH interval, the "dead probe" message will
scroll across the LCD; the readings will blink on the upper LCD to warn
the user that they are not reliable.

CALIBRATION ALARM TIME-OUT

The calibration alarm time-out is available only for pH calibration.
It is possible to set (through setup code "dUE") the number of days

before the next required calibration procedure. User can set a value

AUTO ENDPOINT MODE

The Auto Endpoint feature allows the user to freeze the display when
a stable reading is reached.

To enter the Auto Endpoint mode, press the ALT and AutoEnd keys.
The MEM symbol will blink on the LCD until measurements become
stable, then readings (pH/mV and temperature) are frozen on the
display.

By pressing the RANGE key it is possible to switch between pH and
mV measurements.

While in Auto Endpoint mode, frozen readings can be logged by
pressing the LOG key (See "Logging function" section).

To exit from Auto Endpoint mode, press again the CAL and AutoEnd
keys. The meter will return to continuous measurement mode.

Note: By entering the setup mode, by log consulting or by pressing

the ALT and GLP keys, the meter will automatically exit from
the Auto Endpoint mode.

pH CALIBRATION PROCEDURE

For greatest accuracy, it is recommended to calibrate the instrument
frequently. For a faster procedure, it is possible to calibrate in 1 point,
but it is always a good practice to calibrate in 2 points.

A two-point calibration can use any combination from the following
sets of pH buffers:

1.68 4.01 (6.86 or 7.01) (9.18 or 10.01) 12.45

or

3.00 (6.86 or 7.01) (9.18 or 10.01) 12.45

E.g. in the case of a two-point calibration in the acidic range (from 0
to 7 pH), use the pH 7.01 (or 6.86) buffer as first solution and pH

4.01 as second one; if testing in the alkaline range (from 7 to 14
pH), use the pH 10.01 (or 9.18) buffer as second solution.

Due to electrode conditioning time, the electrode must be kept
immersed a few seconds to stabilize. The meter is equipped with a
stability indicator and the user will be guided step by step with easy
indications on the LCD during the calibration. This will make the
calibration a simple and error-free procedure.

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13

ALT

GLP

FNC

CFM

RANGE

AutoEndCAL

ALT

GLP

FNC

CFM

RANGE

pH CALIBRATION

ON / OFF

ALT

LIGHT

FNC

DEL

1. Rinse pH electrode and temperature probe with a portion of the
first calibration buffer or clean water. Dip the bottom 4 cm (1½")
of both probes into a beaker containing the solution, while pay
attention that the temperature probe is as close as possible to the
pH electrode.

2. Press CAL when the meter displays pH
measurement.

3. Enter the password (if different from "0000") with the arrow keys.

4. Press the ALT and CFM keys to confirm the password or the CAL
key to exit.

- year

- time

- pH reading
"----" means reading out of range or

no probe was connected.
"OrP" means that an ORP electrode

was connected.

- mV reading

"----" means reading out of range.

- temperature reading

"----" means reading out of range.

5. If password is correct, the meter displays "7.01pH" on the lower
LCD with the "BUF 1" and "CAL" indication. The upper LCD shows

the pH reading.

Note: The buffer pH value, and thus the value displayed on the lower

LCD, varies with temperature. For example, at 20oC it shows

4.00 ; 7.03 ; 10.06, at 25oC it shows 4.01; 7.01; 10.01.

6. Select the first buffer solution value with the and keys
if necessary.

7. When the "CFM" symbol blinks, the read­ing is stable and calibration can be
confirmed.

8. Press the ALT and CFM keys to confirm the first buffer.

9. If everything is satisfactory the LCD will
display "Stor" and then the second buffer
value expected (two-point calibration).

- GLP message

• If the RANGE key is pressed when the GLP message is displayed,
the LCD will revert to the date of the viewed sample.

• It is always possible to skip to another sample using the up and
down arrow keys. For example, if the pH reading of a sample is
displayed, pressing the key will cause the meter to display
the pH reading of the next sample.

• At any time it is possible to return to normal operating mode by
pressing the ALT and RCL keys.

TO DELETE LOGGED DATA

It is possible to delete a single sample or all the memory at one time.
To delete a single sample:

• Enter the viewing logged data mode and select the desired
sample number.

• Press the ALT and DEL keys. The "dEL"
and "CFM" indications will start blinking
asking for confirmation.

• Press the ALT and CFM keys to confirm.

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19

CAL AutoEnd

LOGGING FUNCTION

RCL

LOG

ALT

RCL

FNC LOG

GLPRANGE

FNC

CFM

To store the current reading in memory press the LOG key while in
measurement mode. The LCD will display "Stor" along with the "LOG"
indication and the sample number for a few seconds.

By pressing the LOG key a complete set of information is memorized:
date, time, pH and mV readings, temperature reading and also a
message on the meter status.

Up to 500 samples can be stored into memory.
When the memory is full and the LOG key is

pressed, the sample will not be stored and
the LCD will display "FULL". In this case it is
necessary to delete all the memory to pro­ceed.

TO VIEW LOGGED DATA

To retrieve the memorized information press the ALT and RCL keys.

If a wrong solution or electrode has been
used or if the buffer is polluted, "WRONG"
symbol will blink to alert the user.

10. If a single point calibration is required,
press CAL to exit the calibration mode and
maintain the previous slope calibration.
The instrument then checks the electrode
parameters and advises user of abnor­malities by "old probe" and "dead probe"
indications.

11. Press the or keys to select the second buffer value. The
meter will display the "BUF 2" indication.

12. Rinse the electrode with some of the second buffer solution or clean
water.

13. Dip the bottom 4 cm (1½") of the pH electrode in a beaker
containing the second buffer.

14. When the "CFM" symbol blinks, press the
ALT and CFM keys to confirm the second
calibration point.

15. The LCD will display "Stor". The instrument checks the electrode
parameters and advises the user of abnormalities by "old probe"
and "dead probe" indications (in these cases, repeat the calibra­tion with fresh buffers). If everything is satisfactory the meter is
calibrated and it returns to normal operational mode.

The meter displays the date (upper LCD) and
the number (lower LCD) of the last logged
sample. The "ZERO" indication will be dis­played if no samples are stored in memory.

• Select the desired sample number with the arrow keys. Pressing
the key while the last sample is displayed causes the meter
to go to the first sample.

• Press the RANGE key to view the remain­ing data of the selected sample. After
the date information, the remaining data
will be displayed in the following order:

18

CALIBRATION ERROR MESSAGES

If the "old probe", "dead probe" or "WRONG" messages are displayed
during calibration, check your electrode by following the conditioning
and maintenance procedures and repeat calibration. The pH elec­trode might have to be replaced if calibration cannot be successfully
performed.

Note: See "GLP" section for more details about "old probe" and "dead

probe" messages.

15

ELECTRODE CONDITION

The evaluation of the electrode performance is made by using a
reference scale from 10 to 100%. If the electrode condition is below
10%, the warning "bAd" electrode will be displayed.

The electrode performance is evaluated at calibration time. The new
evaluation for the electrode is made only if a new calibration is
performed. For an accurate electrode evaluation, a daily calibration is
necessary.

If only one point calibration was made, the meter will not display the
electrode condition.

Also if the electrode condition option (ELC) is disabled (OFF) from the
setup menu, the electrode performance will not be evaluated.

mV CALIBRATION PROCEDURE

A two or three-point calibration can be performed. The first two
calibration points are always 0 and +350 mV; the third point is
optional at +1900 mV.

1. Turn off the meter.

2. Connect a mV simulator (HI8427 or HI931001 with the proper
connecting cable) to the meter and set it to 0 mV.

3. Turn on the meter with the LOG and keys pressed.

4. Enter the password (if different from "0000") with the arrow keys.

5. Press the ALT and CFM keys to confirm the password or the CAL
key to exit.

6. If password is correct, the meter will
display "0 mV" on the lower LCD with the
"BUF 1" and "CAL" indication. The upper
LCD displays the mV reading.

7. When the "CFM" symbol blinks, the read­ing is stable and calibration can be
confirmed.

8. Press the ALT and CFM keys to confirm
the first value.

9. The LCD will display "Stor" for a few
seconds.

10. The meter will then display "350 mV" on
the lower LCD with the "BUF 2" indica­tion.

11. Set the simulator to +350 mV.

12. When the "CFM" symbol blinks, the read­ing is stable. Press the ALT and CFM keys
to confirm the second value.

13. The LCD will display "Stor" for a few seconds.

14. If only a two-point calibration is required, press the CAL key to leave
the calibration mode. Proceed with the next step for three-point
calibration.

15. The meter will display "1900 mV" on the
lower LCD with the "BUF 3" indication.

16. Set the simulator to 1900 mV.

17. When the "CFM" symbol blinks, the read­ing is stable. Press the ALT and CFM keys
to confirm the third value.

18. Calibration is now complete, the instrument returns to normal
operating mode.

Note: "WRONG" message notifies the user if the selected value is

wrong.

TEMPERATURE CALIBRATION PROCEDURE

(for technical personnel only)

A two point calibration at 0.0, 50.0°C has to be performed in order
to store the new calibration data in memory.

1. Turn off the meter.

2. Turn on the meter with the LOG and CAL keys pressed to enter
temperature calibration mode.

3. Immerse the temperature probe in the 0°C temperature bath.

4. Enter the password.

5. The meter will display "0.0 °C" on the lower LCD with the "BUF 1"
and "CAL" indication.

6. When the reading is stable the "CFM" symbol starts to blink.

7. Press the ALT and CFM keys to confirm. LCD will then display

50.0°C on the lower LCD with the "BUF 2" indication.

8. Immerse the temperature probe in the 50°C temperature bath.

9. When the reading is stable the "CFM" symbol starts to blink.

10. Press the ALT and CFM keys to confirm and return to normal
operating mode.

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