Hanna Instruments HI 98140 User Manual

Instruction Manual

HI 98140 • HI 98150

Portable Waterproof

pH / ORP Meters

with Smart Electrodes

& Log-On-Demand

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]

These instruments are 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 ................................................................. 1 1

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

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

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

mV CALIBRATION PROCEDURE .............................................................. 15

TEMPERATURE CALIBRATION PROCEDURE .............................................. 16

LOGGING FUNCTION ............................................................................. 17

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

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

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

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

TEMPERATURE-RESISTANCE CORRELATION

FOR HANNA PH SENSITIVE GLASS .......................................................... 25

ELECTRODE CONDITIONING AND MAINTENANCE ...................................... 2 6

ACCESSORIES ...................................................................................... 28

WARRANTY ......................................................................................... 30

CE DECLARATION OF CONFORMITY ........................................................ 31

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:

• HI 1618D amplified pH electrode with built-in temperature
sensor, plastic body and DIN connector

• pH 4.01 & pH 7.01 buffer solution (20 mL sachet each)

• Electrode cleaning solution

• Batteries (4 x 1.5V AA alkaline) and 12 Vdc adapter

• Instruction manual and 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

HI 98140 and HI 98150 are two of the most innovative portable pH
meters ever offered.
These instruments feature IP 67 waterproof protection, GLP (Good
Laboratory Practice) capabilities and use the HANNA instruments®’
intelligent electrodes.
These pH electrodes incorporate a chip which memorizes the calibra­tion data performed with a specific instrument. When the “intelligent”
electrode is attached to the meter again, it is automatically recog­nized. This technology allows the operator to optimize time and
efficiency with unsurpassed safety. It avoids erroneous measurements
taken in the event the pH electrode is substituted after calibration.
This series of electrodes also incorporates a temperature sensor, elimi­nating the need for an additional temperature probe.
HI 98140 and HI 98150 feature all the most advanced features of
laboratory pH meters. Moreover they are provided with a dual level
LCD which facilitates operation in dimly lit locations.
By pressing a button, these meters can store up to 500 measure­ments complete with date and hour. Stored data can be displayed
later or downloaded to a computer through an RS232 serial port and
the HI 92000 Windows® compatibile software.

32

These instruments also feature a controlled access to calibration and
GLP settings through a password protection method.

The Battery Error Preventing System (BEPS) detects when the batter­ies become too weak to ensure reliable measurements.

The backlight feature is automatically disabled when the 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.

For long term field and lab applications, these meters can be connected
to a 12 Vdc adapter.

In addition, the meters allow the user to enter an ID code to uniquely
identify the instruments.

FUNCTIONAL DESCRIPTION

1) Power adapter plug

2) RS232 connector

3) DIN connector for smart electrodes

4) Liquid Crystal Display (LCD)

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

6) ALT key, to activate alternate key function

7) RANGE / GLP key, to select measurement range, to display time
and date, and to view calibration data (with ALT)

8) CAL / CALT key, to enter calibration mode

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

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

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)

54

SPECIFICATIONS

INITIAL PREPARATION

Range -4.00 to 19.99 pH / -20 to 120.0°C

HI 98150 only: ±600.0 mV; ±2000 mV

Resolution 0.01 pH

0.1°C (-10 to 120°C) / 1°C (below -10°C)

HI 98150 only: 0.1 mV (±400 mV) /

0.2 mV (±400 to ±600 mV) / 1 mV (outside)

Accuracy (@20°C/68°F) ±0.01 pH

±0.4 °C from 0 to 70°C / ±1°C outside

HI 98150 only: ±0.2 mV (±400 mV) /

±0.4 mV (±400 to ±600 mV) / ±2 mV (outside)

Typical EMC Deviation ±0.02 pH / ±0.4°C

HI 98150 only: ±1 mV (±600 mV) / ±2 mV (outside)

pH Calibration Automatic, 1 or 2 point with 5 memorized buffers

(pH 4.01, 6.86, 7.01, 9.18 and 10.01)

mV Calibration Automatic, 2 point at 0 and 350 mV or
(HI98150 only) 3 point at 0, 350 and 1900 mV

Temperature Compensation

Automatic, -20 to 120°C (-4 to 248°F)

pH Electrode HI 1618D smart electrode with built-in temperature

sensor, DIN connector and 1 m (3.3') cable (included)

ORP Electrode Smart ORP electrode with DIN connector

(HI98150 only; see accessories)

Input Impedance 10
PC Connection Through RS232 serial port,

using HI 920011 connection cable & HI 92000 software

Power Supply 4 x 1.5V AA batteries / approx. 300 hours of use

(with backlight off) or 12 Vdc input

Casing IP 67
Environment 0 to 50°C (32 to 122°F); RH max 100%
Dimensions 196 x 80 x 60 mm (7.7 x 3.1 x 2.4")
Weight 500 g (1.1 lb.)

12

Ohm

Each meter is supplied complete with batteries. Remove the back
cover, unwrap the batteries and install them while paying attention
to the polarity. Alternatively, connect the supplied 12 Vdc adapter to
the power adapter plug.

To prepare the instrument for use, connect the pH or ORP (HI 98150
only) electrode to the connector located on the top of the instrument.

To switch the meter on, press the ON/OFF key.
The batteries charge status or "LINE" message
(if external power adapter is connected) will be
displayed on the LCD for a few seconds.

ON/OFF

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 20). To reactivate the instrument press
the ON/OFF key.

Before proceeding with pH measurements follow the calibration proce­dure.

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

RCL and CALT) is requested, press and hold the ALT key first
and then the second listed key.

Note: to prevent damage 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.

76

SETUP MODE

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 "00" will blink on the
lower LCD and "Set" will be displayed on
the upper one.

• Select the code of the desired
parameter using the  or 
key.

• Press ALT and CFM to confirm the
code.

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

will default 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 of 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 ALT and
CFM 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 ALT
and CFM 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 the parameter.

PARAMETER SETTINGS

• Once the parameter code (and password
if needed) has been entered, the current
value of the selected parameter on the
upper LCD and the parameter code on
the lower LCD will be displayed. The parameter or a part of it will
blink (e.g. only the hour blinks if time has been selected).

• Enter the new value using the arrow keys.

• If there is another part of the parameter to be set (e.g. minutes
for the time), press RANGE to gain access and then enter the new
value using the arrow keys.

• Press ALT and CFM to confirm the value.

• If the entered value is not acceptable, the "WRONG" indication
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 ALT and FNC are pressed before parameter value confirma-

tion, the meter will not update the parameter and after
escaping will ask for a new setup code.

The following table lists the setup codes along with the description of
the specific setup items, their valid values and the factory settings
(default):

Code Valid values Default

00 Instrument ID code 0000÷9999 0000
01 Current time
02 Current date
03 Current year
10 Calibration alarm time-out 01÷99 days , OFF OFF
20 Auto-Off/Power down time-out ON, OFF ON
21 Firmware version
22 Battery level test
99 Password

1

1

1

2

hh:mm 00:00
dd:mm 01:01
YYYY 1998

0000÷9999 0000

98

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.

Code 00 - 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 code 00.

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

• Press ALT and CFM to confirm the value.

Code 20 - Auto-off

The auto-off timeout is fixed at 5 minutes.

• Select code 20 to enable/disable this feature.

Code 22 - Battery level test

• Select code 22.

• If the meter is connected to an external power adapter, the LCD
will display "LINE" otherwise it will display "bAtt" on the upper
display, 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 any time the meter is

turned on.

TAKING pH MEASUREMENTS

Connect the pH electrode with the built-in tempera­ture sensor to the meter and press ON/OFF to
power on the instrument. The meter automatically
checks that the stored calibration data correspond to the connected
electrode. The pH range will be automatically set.

If the pH electrode is not connected the LCD will display the "no
probe" message and then dashed lines in place of the readings.

For greatest accuracy, it is recommended to set
the Calibration alarm time-out to the value
appropriate to your specific use and calibrate
the meter as soon as the "DATE" warning
symbol blinks on LCD (see GLP section).

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

The temperature is displayed in the lower LCD.
The pH reading is automatically temperature compensated (ATC).
If the meter displays "----" it means that the reading is out of range.

A blinking reading means that the electrode is "dead".
By continuously pressing the RANGE key the

following information will be displayed on
the upper LCD:

• mV reading (HI98150 only)
The mV scale is autoranging, when the

reading is outside ±600mV the decimal
point automatically disappears.

• Time

• Day - Month

• Year

Pressing RANGE again, the meter returns to pH reading.
Note: When date or time is displayed, it is possible to change them

pressing ALT and FNC with no need to enter setup mode.

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.

1110

TAKING ORP MEASUREMENTS

(HI98150 ONLY)

Connect the ORP electrode to the meter and press the ON/OFF key.
The meter automatically sets the mV range.
If the ORP electrode is not connected the LCD will display the "no

probe" message and then dashed lines in place of the readings.
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: The ORP electrodes are not provided with the temperature

sensor.

By continuously pressing the RANGE key the following information will
be displayed on the upper LCD:

• Time

• Day - Month

• Year
Pressing RANGE again, the meter returns to mV reading.

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

pH CALIBRATION PROCEDURE

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

A two-point calibration can use any combination of the three sets:

(4.01) (6.86 / 7.01) (9.18 / 10.01)

Only one value from each set can be selected. For example if pH

7.01 is used as first point, it will not be possible to select pH 6.86

as the second point.
In the case of a two-point calibration (in the acidic range) from 0 to

7 pH, use pH buffer 7.01 (or 6.86) as the first solution and pH buffer

4.01 as the second solution. if testing in the alkaline range from 7 to

14 pH, use pH buffer 10.01 (or 9.18) as the 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.

pH CALIBRATION

1. Rinse the electrode with a portion of the

first calibration buffer or clean water.
Dip the bottom 4 cm (1½") of the
electrode into a beaker containing the
solution.

2. Press CAL when the meter displays pH

measurement.

The temperature sensor is integrated in the pH electrode.
Immerse the pH electrode 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 " - - -".

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

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

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 uncalibrated pH reading.

1312

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  and  if necessary.

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.

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

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

9. If everything is satisfactory the LCD will
display "Stor" and then the second buffer
value expected will be displayed (two­point calibration). If a wrong solution or
electrode has been used or if the buffer is
polluted, "WRONG" will be displayed to
alert the user.

10. If only 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  or  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 ALT
and CFM to confirm the second calibra­tion point.

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" paragraph for more details about "old probe" and

"dead probe" messages.

mV CALIBRATION PROCEDURE

(HI98150 ONLY)

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

2. Press CAL when LCD is displaying mV.

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

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

5. 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.

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

7. Press ALT and CFM to confirm the first
value.

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

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

1514

10. Set the simulator to +350 mV.

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

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

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

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

15. Set the simulator to 1900 mV.

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

17. Calibration is now complete, the instrument returns to normal
operational mode.

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

wrong.

TEMPERATURE CALIBRATION PROCEDURE

(for technical personnel only)

LOGGING FUNCTION

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 (HI98150 only) 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 ALT and RCL.

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. Immerse the pH electrode with the built-in temperature sensor in
the 0°C temperature bath.

2. Press ALT and CALT to enter temperature calibration mode.

3. Enter the password.

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

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

6. Press ALT and CFM to confirm. LCD will then display 50.0°C on
the lower LCD with the "BUF 2" indication.

7. Immerse the pH electrode with the built-in temperature sensor in
the 50°C temperature bath.

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

9. Press ALT and CFM to confirm and return 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 RANGE to view remaining data of the
selected sample. After the date information,
the remaining data will be displayed in the
following order:

1716

- year

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

displayed when selecting a deleted sample.

- time

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

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

was connected.

- mV reading

(HI98150 only)
"----" means reading out of range.

- temperature reading

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

- GLP message

• If RANGE 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 up arrow key will cause the meter to
display the pH reading of the next sample.

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

To delete all data in memory:

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

• Press ALT and CFM to confirm deletion.

Note: Press ALT and DEL 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 operational mode.

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 ALT and DEL. The "CFM" indication
will start blinking asking for confirma­tion.

• Press the ALT and CFM to confirm deletion.

1918

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. HI98140 and HI98150 use electrodes with a built-in
EEPROM in which calibration data are read at start-up and stored
after calibration. The meter can automatically analyze the data and
advise the user if a problem is found with a clear message.

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 parameters, 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 para­graph) 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.

ELECTRODE IDENTIFICATION

At start-up the meter checks if the electrode is inserted. If not the
message "no probe" scrolls across the LCD and a dashed line "----" will
be displayed in place of the reading.

If the meter detects a "dead probe" the readings will blink.
The meter checks the electrode only at start up. If an electrode

replacement is needed, turn the meter off before disconnecting the
electrode. Then replace the electrode and turn the meter on again.

CALIBRATION ALARM TIME-OUT

The calibration alarm time-out is available only for pH calibration.
It is possible to set (through setup code 10) the number of days

before the next required calibration procedure. User can set a value
from 01 to 99 days. The default value is 07. Set the parameter to
"OFF" to disable this feature.

When turned on, the meter checks if the time­out time has expired. If the time has run out,
the message "Cal date" scrolls across the LCD.
The "DATE" symbol will blink as a reminder.

Alarm time-out is also signaled when viewing logged data through
the "Cal date" 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" paragraph).

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 ALT and GLP when the meter displays pH reading.

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

• Press RANGE 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 operational mode. Press ALT

and GLP to escape before viewing all the data.

to view mV calibration data (HI98150 only)

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

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

• Press RANGE to scan remaining data, in the following order:
last calibration time
first calibration point
second calibration point
third calibration point (only if a 3-point calibration has been

performed).

• The meter will then return to normal operational mode. Press ALT

and GLP to escape before viewing all the data.

2120

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.
When the backlight is enabled and an external power supply

is connected to the instrument, the backlight is always on.

DATA TRANSFER TO PC

Press RANGE to set the meter to time or date mode and connect the
meter to a PC through the RS232C output (the connector is located
on the top of the meter). Use HI920011 (5 to 9-pin) connection
cable.

To stop communication, press RANGE to display pH or mV reading.

SPECIFICATIONS:

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

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 commands available 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
mV calibration status (HI98150 only;1=calibrated,0=not calibr.)
mV calibration date (ddmmyy; HI98150 only)
mV calibration time (hhmm; HI98150 only)
mV buffer 1 (HI98150 only)
mV buffer 2 (HI98150 only)
mV buffer 3 (HI98150 only)
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; HI98150 only)
temperature reading (binary)
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.

2322

+

-

BATTERY REPLACEMENT

0

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

C

When the batteries are inserted and no power adapter is connected,
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
or an external power adapter is connected. The "Batt" indication
appears when trying to enable backlight.

3. Weak batteries - "Bat" indication is displayed on lower LCD
alternating the temperature reading. Backlight is disabled and
meter can work for about 10 hours.

4. Dead batteries - LCD shuts off. The instrument stops working to
avoid erroneous readings.

Battery replacement must only take place
in a safe area and using four 1.5 V AA
alkaline 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.

A 12 Vdc power adapter can also be
used to power the unit (see accessories).

Note: The instrument uses the following configuration.

It is recommendable to purchase the Hanna voltage adapters that
use the proper polarity configuration (HI 710005 or HI 710006).

However, HI 98140 and HI 98150 can be used with other adapters.
In this case, remember to check the correct polarity of your adapter
before connecting it to the meter.

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

Ω

9

2x10

-10

9

1x10

-10

8

-10

2x10

8

1x10

-10

7

2x10

-10

-10

7

1x10

-10

-20-2

-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

+

13.00

13.50

14.00

12.50

1.0 Mol L-1 Na

+

13.00

13.50

14.00

°

0.10

0.14

0.20

0.10

0.18

0.29

0.40

2524

ELECTRODE CONDITIONING

AND MAINTENANCE

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

sample before turning the meter off.
With the meter OFF, detach the electrode from the meter and

immerse it in the storage solution.

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 HI 70300
storage solution for at least one hour.

For refillable electrodes

If the filling solution (electrolyte) is less than 1 cm (½") below the fill
hole, add HI 7082 (3.5M KCl electrolyte solution) for double junction
or HI 7071 (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 HI 70300
storage solution or, in its absence, filling solution (HI 7071 for single
junction or HI 7082 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.

For refillable electrodes

Refill it with fresh electrolyte (HI 7071 for single junction or HI 7082
for double junction electrodes). Allow the electrode to stand upright for
1 hour. Follow the Storage Procedure above.

CLEANING PROCEDURE

- General: soak in HANNA HI 7061 general cleaning solu-
tion for approximately 1 hour.

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

- Protein: soak in HANNA HI 7073 protein cleaning solution
for 15 minutes

- Inorganic: soak in Hanna HI 7074 inorganic cleaning solu-
tion for 15 minutes

- Oil/grease: rinse with Hanna HI 7077 Oil & 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 HI 70300 storage solution for at
least 1 hour before taking measurements.

TROUBLESHOOTING

Evaluate performance of your electrode 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 (for refillable

electrodes only): refill with fresh HI 7071 for single junction
electrodes or HI 7082 for double junction electrodes.

2726

• Dry Membrane/Junction: soak in HI 70300 storage solution for
at least 1 hour

• Drifting: soak the electrode tip in warm HI 7082 solution for one
hour, then flush tip with distilled water. Refill with fresh HI 7071
for single junction electrodes and HI 7082 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 HI 7061
solution for 30 minutes, rinse thoroughly in distilled water and
then follow the Cleaning Procedure above.

ACCESSORIES

pH CALIBRATION SOLUTIONS

HI 70004P pH 4.01 buffer solution, 20 mL sachet, 25 pcs
HI 70007P pH 7.01 buffer solution, 20 mL sachet, 25 pcs
HI 70010P pH 10.01 buffer solution, 20 mL sachet, 25 pcs
HI 7004L pH 4.01 buffer solution, 500 mL bottle
HI 7006L pH 6.86 buffer solution, 500 mL bottle
HI 7007L pH 7.01 buffer solution, 500 mL bottle
HI 7009L pH 9.18 buffer solution, 500 mL bottle
HI 7010L pH 10.01 buffer solution, 500 mL bottle

ELECTRODE MAINTENANCE SOLUTION

HI 70300L Storage solution, 500 mL bottle
HI 70000P Electrode rinsing solution, 20 mL sachet, 25 pcs
HI 7061L General cleaning solution, 500 mL bottle
HI 7073L Protein cleaning solution, 500 mL bottle
HI 7074L Inorganic cleaning solution, 500 mL bottle
HI 7077L Oil & Fat cleaning solution, 500 mL bottle
HI 7071 3.5M KCl+AgCl electrolyte solution, 4 x 50 mL bottle
HI 7072 1M KNO3 electrolyte solution, 4 x 50 mL bottle
HI 7082 3.5M KCl electrolyte solution, 4 x 50 mL bottle

SMART ELECTRODES

HI 1615D Smart pH electrode, glass body, single junction, refill-

able, with built-in temperature sensor, DIN connector
and 1 m (3.3') cable

HI 1616D Smart pH electrode, glass body, single junction, gel-

filled, with built-in temperature sensor, DIN connector
and 1 m (3.3') cable

HI 1617D Smart pH electrode, glass body, single junction, triple

ceramic, refillable, with built-in temperature sensor,
DIN connector and 1 m (3.3') cable

HI 1618D Smart pH electrode, plastic body, single junction, gel-

filled, with built-in temperature sensor, DIN connector
and 1 m (3.3') cable

HI 3619D Smart ORP/Pt electrode, glass body, single junction,

with DIN connector and 1 m (3.3') cable

HI 3620D Smart ORP/Pt electrode, glass body, single junction,

gel-filled, with DIN connector and 1 m (3.3') cable

FC 201D Smart pH electrode, single junction, with built-in

temperature sensor, DIN and 1 m (3.3') cable

FC 212D Smart pH electrode, double junction, with built-in

temperature sensor, DIN and 1 m (3.3') cable

FC 231D Smart pH electrode, single junction, with penetration

blade (20 mm / 0.79"), built-in temperature sensor,
DIN connector and 1 m (3.3') cable

FC 241D Smart pH electrode, single junction, with penetration

blade (35 mm / 1.38"), built-in temperature sensor,
DIN connector and 1 m (3.3') cable

OTHER ACCESSORIES

HI 710005 Voltage adapter, 115 Vac / 12 Vdc
HI 710006 Voltage adapter, 230 Vac / 12 Vdc
HI 76405 Electrode holder
HI 8427 pH and mV simulator
HI 931001 pH and mV simulator with LCD display
HI 92000 Windiws® compatible software
HI 920011 Serial cable for PC connection (5 to 9-pin)

ORP PRETREATMENT SOLUTIONS

HI 7091L Reducing pretreatment solution, 500 mL bottle
HI 7092L Oxidizing pretreatment solution, 500 mL bottle

2928

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. The
electrodes 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.

CE DECLARATION OF CONFORMITY

All rights are reserved. Reproduction in whole or in part is
prohibited without the written consent of the copyright owner.

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
24 Vac or 60 Vdc.

To avoid damages or burns, do not perform any measurement in microwave ovens.

SALES AND TECHNICAL SERVICE CONTACTS

Australia:

Tel. [phone] • Fax [phone]

China:

Tel. [phone] • Fax [phone]

Egypt:

Tel. & Fax [phone]

Germany:

Tel. [phone] • Fax [phone]

Greece:

Tel. [phone] • Fax [phone]

Indonesia:

Tel. [phone] • Fax [phone]

Japan:

Tel. [phone] • Fax [phone]

Korea:

Tel. [phone] • Fax [phone]

Malaysia:

Tel. [phone] • Fax [phone]

Singapore:

Tel. [phone] • Fax [phone]

South Africa:

Tel. [phone] • Fax [phone]

Taiwan:

Tel. [phone] • Fax [phone]

Thailand:

Tel. [phone] • Fax [phone]

United Kingdom:

Tel. [phone] • Fax [phone]

USA:

Tel. [phone] • Fax [phone]

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

MAN98150R4 08/05