AMALGAMATED INSTRUMENT HH4-PH Guide

HH4-PH
Hand Held
Digital pH/mV/Temperature Meter
Operation and Instruction Manual

Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Read this first . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Push Button Location & Function . . . . . . . . . . . . . . . . . . . . 5
Setting up and programming functions . . . . . . . . . . . . . . . . . 6
Step 1, Entering the setup mode. . . . . . . . . . . . . . . . . . . . . 6
Step 2, Stepping through the settings . . . . . . . . . . . . . . . . . . 6
Step 3, Making changes to the settings . . . . . . . . . . . . . . . . . 6
Programming Functions: . . . . . . . . . . . . . . . . . . . . . . . . . 7
Function Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Errors and Status Messages . . . . . . . . . . . . . . . . . . . . . . 14
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Guarantee and Service . . . . . . . . . . . . . . . . . . . . . . . . . 16
Page 2 of 16 HH4PHMAN-1.0-2

1 Introduction
This manual contains information on the operation of the AIC HH4-PH Intelligent Digital
pH meter. The HH4 is a general purpose portable pH meter which may be cycled between pH,
millivolts (for Redox/ORP sensor inputs) and temperature by pressing the front panel keypad.
When the HH4-PH is turned on, the display will indicate various power up messages and then
settle into the measurement mode. The position of the decimal point allows the user to determine
which range is currently selected. The pH range has a resolution of 0.01pH (XX.XX) i.e. 2
decimal point places, the millivolt range has a resolution of 1mV (XXXX) i.e. no decimal point
places and the temperature range to 0.1o(XXX.X) i.e. one decimal point place.
Unless otherwise specified at the time of order, your HH4 has been factory set to a
standard configuration (see next chapter “Read this first”). Like all other HH4 series instruments
the configuration and calibration is easily changed by the user.
An automatic turn off function powers the instrument down after a preset time period -
this feature is ideal for saving power.
By pressing the “Cal/Hold” button the display may be held on the current reading.
The HH4 series of Hand Held Digital Instruments are designed for high reliability in
industrial or laboratory applications. The high contrast LCD provides good visibility and are ideal
for battery powered applications.
Page 3 of 16 HH4PHMAN-1.0-2

2 Operation
The HH4-PH digital pH meter is operated by pressing the on/off button. The following
display sequence is executed during startup:
8.8.8.8 Display check
AIC Company name
PHX.X Software version number
This sequence will take around eight seconds then the display will indicate the current
pH value. If a millivolt or temperature reading is required, press the “pH/mV/Temp” keypad to
obtain the required reading. The display may be cycled through “mV”, “temp” and “pH” by
successively pressing the keypad. The current display may be held (frozen) at any time simply
by pressing the “Cal/Hold” keypad.
Note: When the “Cal/Hold” keypad is pressed the display will indicate “Hold” and then
hold the current reading, if the “Cal/Hold” keypad is pressed again the display will indicate LIUE
and the display will be released from hold.
The instrument features an automatic turn off function and will automatically power
down after a predetermined number of minutes (note: see chapter on setting up the instrument).
This feature is ideal for saving power, when the instrument is accidentally left turned on. The
automatic turn off function, may be disabled by selecting “0" minutes when setting up the
instrument.
2 .1 Read this first
Your new HH4-PH has been supplied factory configured (unless otherwise specified),
as follows:
Manual Temperature: Set to 25oC
Temperature units: Set to oC
Auto turn off: Set to 10 minutes
Digital filter: Set to 3 (range 0 to 8, 8=max)
Page 4 of 16 HH4PHMAN-1.0-2

3 Push Button Location & Function
The location and function of the pushbuttons is indicated below use details in
conjunction with chapters “setting up the instrument” and “calibration”.
Page 5 of 16 HH4PHMAN-1.0-2
Cal/Hold keypad
use also to enter
setup mode and
to step through
the functions
pH/mV/Temp keypad
use also as down
button when
setting up
On/Off keypad
use also as up
button when
setting up
Electrode
socket
Temperature
socket
1@65
HH4-PH digital pH/mV/temp meter
pH/mV
Te m p
Cal
Hold
On
Off
2mm Socket for
separate reference
electrode (when fitted)

4 Setting up and programming functions
Setting up and calibrating the HH4-PH is extremely easy, since the functions are
changed or viewed by pressing the pushbuttons. Several functions are available to allow the
operator to set the operating modes, as follows:
4 .1 Step 1, Entering the setup mode
To enter the setup mode, a simple pushbutton sequence is necessary. First press the
“Cal/Hold” button, release the button and then (within 2 seconds) press both the ^
“On/OFF” button and the v“pH/mV/Temp” buttons simultaneously. The display will now
read FUNC thereby indicating that you have entered the Setup Function Mode.
Note: the “On/Off” button is used as an up button ^
The “pH/mV/Temp” button is used as a down button v
4 .2 Step 2, Stepping through the settings
The display of FUNC is followed by the first setup message, OFSt. As with all other
messages the first display lets you know which parameter will be affected when changes
are made. Each time the “Cal/Hold” button is pressed another setup parameter is
displayed until you reach the last function when FUNC End is displayed and the
instrument returns to the normal pH display.
4 .3 Step 3, Making changes to the settings
Whilst still in the Function Setup Mode, press the “Cal/Hold” button until you reach the
parameter you wish to change. Initially the display will indicate the particular function (e.g.
FLtr), this will be followed by a display showing the current status of that setting (e.g. 3)-
press the ^“On/OFF” button or the v“pH/mV/Temp” pushbutton until the desired value
is displayed. You may then proceed through the functions (by pressing the “Cal/Hold”
button) until you reach the next function that you wish to change or until you exit the
function mode.
Page 6 of 16 HH4PHMAN-1.0-2

4 .4 Programming Functions:
The functions are described as follows:
OFSt (pH offset calibration)
Used for fast single point
calibration (usually around pH
7.00) to compensate for changes
to the electrode, when exhibited
as an offset error (see
"Calibration" chapter).
gAIN (pH gain calibration)
Used for fast single point
calibration to compensate for
changes to the electrode, when
exhibited as a gain error (see
"Calibration" chapter).
SLPE (pH electrode slope)
This function displays the existing calibrated slope of the pH electrode in relation to the
ideal slope of a pH electrode. The slope is expressed as a percentage and provides an
indication of the electrode condition. When the electrode slope reduces to 80% the
electrode should be discarded
Auto -on/OFF (set auto or manual temperature compensation)
Press the ^“On/OFF” button or the v“pH/mV/Temp” button to change from automatic
temperature compensation on or manual temperature compensation. When set to on the
pH reading will automatically be compensated for temperature changes measured by the
temperature probe. When set to OFF the pH reading will be compensated by the manual
set value.
Note:
When the HH4-PH is set to manual, the manually set temperature will be displayed when
the display is cycled to read temperature - if the temperature probe is not connected.
When the HH4-PH is set to automatic, the manually set temperature will not be displayed.
However, if the temperature input is out of range (e.g. not connected) or is below 20oC then
the instrument will default to the manual set temperature (PRSt) value. Use the ^/v
buttons to select the manual compensation temperature required. This value will also be
used if Auto is selected to on and the temperature input is out of range.
PRSt (preset temperature value).
This function allows the user to set a temperature value to be used as the default value for
temperature compensation when no temperature sensor is used. When no temperature
This value should be set to the temperature of the solution being measured.
FLtr (digital filter)
Press the ^“On/Off” button or the v“pH/mV/Temp” button to select the digital filtering
value. Digital filtering is used for reducing susceptibility to short term interference. The
digital filter range is selectable from 0 to 8, where 0= none and 8= most filtering. A typical
value for the digital filter would be 3.
Page 7 of 16 HH4PHMAN-1.0-2
ELECTRODE
MILLIVOLTS
ELECTRODE
OFFSET
+mV
-mV
0 pH 7 pH 14 pH
0
ELECTRODE
MILLIVOLTS
ELECTRODE
GAIN
+mV
-mV
0 pH 7 pH 14 pH
0

APdt (set Auto Power Down Time)
Press the ^“On/Off” button or the v“pH/mV/Temp” button to select the Automatic Power
Down Time (auto turn off time). The time is programmable over the range of 0 to 250
minutes. Note: if continuous operation is required, select 0to disable the auto turn off
function.
Calibration functions (see also chapter titled “Calibration”).
To enter this mode a special “power up procedure must be followed” this procedure
prevents accidental alteration of calibration and provides a degree of calibration security.
Press the “On/Off” to turn the instrument on.
Press and hold the “Cal/Hold” button whilst the instrument displays 8.8.8.8 during the
wake up cycle. The instrument will momentarily show CAL in the wake up message to let
you know that the calibration level of the function mode is now accessible.
To enter into the calibration mode, you must now enter the function set up mode as
described earlier in this chapter “entering the set up mode” and step through the functions
until the display indicates CAL.
CAL1 &CAL2 (pH calibration using 2 buffer solutions)
Displays and sets the two independent pH calibration points. See "Calibration" chapter for full
details.
UCAL (pH uncalibration).
Used to set the instrument back to the factory calibration values. This function should only
be used when calibration problems exist, and it is necessary to clear the calibration
memory. See "Calibration" chapter for full details.
CAL.E (millivolt calibration).
The millivolt calibration is a single point calibration.
See "Calibration" chapter for full details.
UC.E (millivolt uncalibration).
Used to set the instrument back to the factory calibration values. This function should only
be used when calibration problems exist. See "Calibration" chapter for full details., and it is
necessary to clear the calibration memory.
CAL.t (temperature calibration).
This function is only available if Auto is set to on. The temperature calibration is a single
point calibration. The temperature probe is placed in an accurately known environment
and the correct value is entered into the instrument memory.
UC.t (temperature uncalibration).
This function is only available if Auto is set toon. Used to set the instrument temperature
calibration back to the factory calibration value. This function should only be used when
calibration problems exist, and it is necessary to clear the calibration memory.
Returning to the normal measure Mode
Important; When the calibration is complete, it is advisable to return the instrument to the
normal mode (where calibration functions cannot be tampered with). To return to the
normal mode - turn off the instrument power - wait a few seconds and then restore power.
Page 8 of 16 HH4PHMAN-1.0-2

5 .0.1 Function Table
Page 9 of 16 HH4PHMAN-1.0-2
Initial display Meaning of
display Next display Record Your Settings
OFSt pH calibration
offset
Value stored
in memory
gAIN pH calibration
gain
Value stored
in memory
SLPE pH electrode
slope
Value from
last calibration
Auto Auto or manual com-
pensation on or OFF
Pr.St Manually set
temperature value
Manual temperature
value
FLtr Digital filter
range 0 to 8
0to 8
(8= most filtering)
APdt eSt auto
turn off time
0to250
minutes
Functions below are accessible via the calibration (CAL) mode only
CAL1 Calibration
point 1
Value stored
in memory
CAL2 Calibration
point 2
Value stored
in memory
UCAL pH
uncalibration
See "Calibration"
chapter
CAL.E mV
calibration
See "Calibration"
chapter
UC.E mV
uncalibration
See "Calibration"
chapter
CaL.t Temperature
calibration
See "Calibration"
chapter
UC.t Temperature
uncalibration
See "Calibration"
chapter
5 Function Table

6 Calibration
pH Calibration - 2 methods
The HH4-PH has provision for two methods of pH calibration, a single points may be
used for routine calibration, whilst a two point method should be used for initial calibration, critical
applications, when the electrode is replaced or for periodical maintenance etc.
The condition of the pH electrode may be evaluated by the electrode slope. As the
electrode ages the sensitivity of the probe is reduced. When a slope value reduces to 80% the
electrode should be discarded. The electrode slope may displayed by selecting SLPE in the
function/setup mode.
Routine pH calibration - single point adjustment
The two single point calibration functions are accessible by entering and stepping
through the function mode (see chapter - “Setting up the Instrument”). These functions are used
to compensate for changes to the offset and gain (slope) of the electrode due to normal ageing
and electrode wear. Normally only one of the two points is used to carry out single point
calibration - the choice is determined by evaluating the cause of the calibration shift. Ideally the
difference between two pH values should be known.
If the pH reading has the same error at two points, then the offset calibration OFSt
should be used.
If the pH reading is correct around 7pH (for electrodes with Eo=7pH) and increases
progressively above or below 7pH, then the gain calibration (gAIN) should be used.
As a general rule, use the offset calibration, when the type of calibration shift is
unknown.
Using the offset (OFSt)function
Enter the Setup Mode in the usual way by pressing the “Cal/Hold” button then pressing
both the ^(“On/Off” button) and the v(“pH/mV/Temp” button) simultaneously (within 2
seconds) the display will indicate OFSt (Calibration offset).
To enter the offset function press the ^and vpushbuttons simultaneously - the
display will indicate the current pH value at the probe. Place the probe in a known value pH buffer
solution. When the display has stabilised, press the “Cal/Hold” button - the display will now read
PH followed by the pH value, the value may now be changed using the ^or vpushbuttons to
read the pH value of the buffer solution. To store the new value press the “Cal/Hold” button. The
display will show OFSt End followed by FUNC End and the system offset will be adjusted so
that the display will show the corrected value.
Page 10 of 16 HH4PHMAN-1.0-2
ELECTRODE
MILLIVOLTS
ELECTRODE
OFFSET
+mV
-mV
0 pH 7 pH 14 pH
0
ELECTRODE
MILLIVOLTS
ELECTRODE
GAIN
+mV
-mV
0 pH 7 pH 14 pH
0

Using the gain (GAIN)function
Enter the Setup Mode in the usual way by pressing the “Cal/Hold” button then pressing
both the ^(“On/Off” button) and the v(“pH/mV/Temp” button) simultaneously (within 2
seconds) the display will indicate OFSt. Press the "Cal/Hold" button again, the display will
indicate GAIN (Calibration gain).
To enter the gAIN function press the ^and vpushbuttons simultaneously - the
display will indicate the current pH value at the probe. Either take a sample of the probe test
solution (if its pH value is known) or place the probe in a known buffer solution. When the display
has stabilised, press the “Cal/Hold” button - the display will now read PH followed by the pH
value, the pH may now be changed using the ^or vpushbuttons to read the correct pH value of
the probe test solution or buffer. To enter the correct value press the “Cal/Hold” button. The
display will show gAIN End followed by FUNCEndand the system gain will be adjusted so that
the display will match the corrected value.
Two point calibration - see alsp HH4-PH two point calibration procedure example which
follows.
To enter the calibration mode and gain access to the two point calibration functions a
special “power up procedure” must be followed. This procedure prevents accidental alteration of
calibration and provides a degree of calibration security.
Preparing to initialise
Turn instrument off by pressing the “On/Off” button.
Initialising the calibration mode
Press and hold the “Cal/Hold” button whilst applying power to the instrument (by
pressing the “On/Off” button). The instrument will momentarily show CAL (during the wake up
messages) to let you know that the calibration level of the function mode is now accessible.
pH calibration (2 points)
Enter the Setup Mode in the usual way by pressing then releasing the “Cal/Hold” button
then pressing both the “On/OFF (^)” button and the “pH/mV/Temp (v)” button simultaneously
(within 2 seconds) and then step through the functions until the display indicates CAL1 (first
calibration point).
To enter the first pH calibration point press the ^and vbuttons simultaneously. The
display will now indicate a pH value and CAL1 will flash every 8 seconds. Immerse the
electrode in a pH buffer solution e.ga7pHbuffer. When the reading has stabilised press the
“Cal/Hold” button. The display will now indicate PH1 (scale 1) followed by the scale value in
memory. Now press the ^or vbuttons to obtain the required scale (calibration) value i.e. enter
the value of the first pH buffer. Press the “Cal/Hold” button to accept the new value. If the value
has been accepted the message StNd will be seen.
The display will now indicate CAL2 (second calibration point). To enter the second
calibration function press ^and vsimultaneously. The display will now indicate a pH value and
CAL2 will flash every 8 seconds. Wash the electrode in distilled or pure water and immerse the
electrode in a second buffer solution ( this value is not critical, for best accuracy should not be too
close to the previous value e.g. 4 pH). When the reading has stabilised, press the “Cal/Hold”
button, the display will now read PH 2 (scale 2) followed by the second scale value in memory.
Press the ^or vbutton to obtain the required scale value i.e. enter the value of the second pH
buffer. Press “Cal/Hold” button the display will now read Stnd followed by FUNC End
indicating that the calibration is complete. The display will return to the measure mode. Note: the
buffer values used will remain in the instrument memory, thereby making future calibration
easier, if the same value buffers are used.
Page 11 of 16 HH4PHMAN-1.0-2

Page 12 of 16 HH4PHMAN-1.0-2
ELECTRODE
MILLIVOLTS
FIRST CALIBRATION
POINT ( )CAL 1
+mV
-mV
0 pH 14 pH
0ELECTRODE
MILLIVOLTS
SECOND CALIBRATION
POINT ( )CAL 2
+mV
-mV
0 pH 14 pH
0
On
Off
pH/mV
Temp
Cal
Hold
On
Off
pH/mV
Temp
Cal
Hold
On
Off
pH/mV
Temp
Cal
Hold
1. Wash and dab dry the probe then place
probe in buffer 2 e.g. 4.00 pH. At the
function press the UP and DOWN pushbuttons
simultaneously. A live reading will be seen.
2. Allow the reading to stabilise
then press the Cal Hold pushbutton. The display
will show followed by a value.
3. Use the UP or Down pushbutton to make this
value equal the first buffer value e.g. for a
4.00 pH buffer.
4.
CAL2
PH2
4.00
Press Cal Hold to accept this new scaling value. The
message will be seen if the input has been
accepted followed by the message .
The instrument will then return to normal measurement.
Stnd
FUNC End
1. Wash and dab dry the probe then place
probe in buffer 1 e.g. 7.00 pH. At the
function
CAL1
press the UP and DOWN pushbuttons
simultaneously. A live reading will be seen.
2. Allow the reading to stabilise
then press the Cal Hold pushbutton. The display
will show followed by a value.
3. Use the UP or DOWN pushbutton to make this
value equal the first buffer value e.g. for a
7.00 pH buffer.
4. Press Cal Hold to accept this new scaling value. The
message will be seen if the input has been
accepted.
PH1
7.00
Stnd
2 Point calibration example
First point
Second point
Entering ModeCAL
1. Remove power from
the instrument using the
On Off button. Hold in the
Cal Hold button and switch
on again by pressing the On Off
button. The display will indicate
as part of the
"wake up messages" when
the message is seen
you can release the buttons.
2. When the "wake up"
messages have finished
and the display has settled
down to its normal reading
press, then release the
Cal Hold button.
3. Within 2 seconds of
releasing the Cal Hold button
press, then release
the On Off and pH/mV Temp
buttons together. The display will
now indicate followed
by the first function.
FUNC
CAL
CAL
HH4-PH two point calibration procedure example
1. Enter mode as shown below.
2. Step through the functions by pressing and releasing the button
until the function is reached.
3. Follow the procedure in the 2 Point calibration example shown below. Note the pH/mV Temp button is used as
the DOWN button & the On Off button is used as the UP button when making adjustments to function settings.
CAL
CAL 1
F
Buffer
solution 1
Buffer
solution 2.
&00
HH4-PH digital pH/mV/temp meter
pH/mV
Temp
Cal
Hold
On
Off
$00
HH4-PH digital pH/mV/temp meter
pH/mV
Te m p
Cal
Hold
On
Off

pH uncalibration
This function sets the instrument calibration back to the factory calibrated value and closely
matches that of an ideal electrode. Uncalibrate is useful as a temporary measure when the pH
electrode is replaced and on the spot recalibration is difficult or when a calibrating error exists
due to incorrect calibration. To enter the uncalibrate mode follow the procedure described above
and step through the functions by pressing the “Cal/Hold” button until the display shows UC.PH.
Press the ^and vpushbuttons simultaneously the display will show CAL CLR followed
by FUNC End indicating that the calibration is cleared. The display will return to the
measure mode.
mV calibration (single point)
Step through the calibrate functions until the display indicates CAL.E (calibrate voltage). To
enter the mV calibration mode press the ^and vbuttons simultaneously. The display will
now show the “live” mV reading. Immerse the electrode in a buffer solution (this value is not
critical and may be anywhere within the measuring range of the instrument). When the
reading has stabilised press the “Cal/Hold” button. The display will now indicate SCLE
followed by the scale value in memory.
Now press the ^or vbutton to obtain the required scale (calibration) value. Press the
“Cal/Hold” button the display will now indicate Stnd followed by FUNC End indicating
that calibration is complete.
Note: the buffer values used will remain in the instrument memory, thereby making future
calibration easier, if the same value buffers are used.
Redox uncalibration
This function sets the instrument calibration back to the factory calibrated value and closely
matches that of an ideal electrode. This is useful as a temporary measure when the Redox
electrode is replaced and on the spot recalibration is difficult or when a calibrating error exists
due to incorrect calibration. To enter the uncalibrate mode follow the procedure described above
and step through the functions by pressing the “Cal/Hold” button until the display shows UC.E.
Press the ^and vpushbuttons simultaneously the display will show CAL.E CLR
followed by FUNC End indicating that the calibration is cleared. The display will return to
the measure mode.
Temperature calibration
Step through the calibrate functions until the display indicates CAL.t (temperature
calibration). Press the ^and vbuttons simultaneously to enter the temperature
calibration mode. The display will now indicate CAL1 (calibration point) followed by the
“live” reading. Place the temperature probe into an accurately known temperature
environment (this value is not critical and should ideally be close to the normal measuring
temperature of the instrument). When the reading has stabilised press the “Cal/Hold”
button. The display will indicate `C followed by the scale value in memory. Now press the
^or vbutton to obtain the required scale (calibration) value i.e the known temperature.
Press the ”Cal/Hold" button the display will now read CAL.t ENd followed by FUNC End
indicating that the calibration is complete. The display will return to the measure mode.
Temperature uncalibration
This function returns the calibration to that of an ideal temperature probe and is useful
when a temperature calibration error has occurred due to miscalibration and the
conditions do not allow on the spot recalibration. To enter the uncalibrate mode follow the
procedure described above and step through the functions by pressing the “Cal/Hold”
button until the display shows UC.t. Press the ^and vpushbuttons simultaneously the
display will show CAL.t CLR followed by FUNC End indicating that the calibration is
cleared. The display will return to the measure mode.
Returning to the normal measure mode
When the calibration procedure has been completed, it is advisable to return the
instrument to the normal mode (where calibration functions cannot be tampered with). To return
to the normal mode turn the instrument off by pressing the On/Off button (to exit the calibration
mode), wait a few seconds and then turn on again.
Page 13 of 16 HH4PHMAN-1.0-2

7 Errors and Status Messages
The status message which represent conditions and errors, are as follows:
batt (low battery voltage)
Indicates that the battery voltage has reached approximately 6.4V. The unit will continue to
operate - a new battery should be fitted as soon as possible.
CAL Err (calibration error)
If the display is in overrange during calibration and an attempt is made to calibrate, then
this message will be displayed. The calibration will remain unchanged.
-or- (display overrange)
The value attempting to be displayed is above 9999 or below -1999. This indicates that
calibration is in error. Uncalibrate the appropriate input and try recalibrating again.
---- (ADC overrange)
This indicates an ADC overrange. The input to the unit is out of the reading range of the
ADC. Check the input level from the sensor and compare with the instrument input
specifications.
Page 14 of 16 HH4PHMAN-1.0-2

8 Specifications
Technical Specifications
pH Input : Any pH electrode where Eo=7 (-2V tp 2V nom):
mV Input: -2000mV to 2000mV
Temperature Input: LM335 temperature sensor
Temperature Range: -50 to 150oC
Input Resistance: Greater than 1010 Ohms (pH & mV)
ADC Resolution: 1 in 20,000
Accuracy pH & mV: Better than 0.2% of full scale
Accuracy Temperature: Better than 0.5% of full scale
Conversion Method: Dual Slope ADC, 4 samples per second
Microprocessor: MC1468HC05C85 CMOS
Ambient Temperature: 0 to 50°C
Humidity: 5 to 95% non condensing
Display: LCD 4 digit 12.7mm
Power Supply: 9V 216 style battery, (Alkaline recommended)
Quiescent current: 10uA Maximum
Operating current: 10mA Maximum
Physical Characteristics
Case Size: 80mm (W) x 145mm (L) x 32 to 39mm (D)
Connections: BNC connector for pH or Redox (mV) probe
Mini Jack socket for temperature probe
Banana socked for reference electrode (if fitted)
Weight: 250 gms including battery
Page 15 of 16 HH4PHMAN-1.0-2

9 Guarantee and Service
The product supplied with this manual is guaranteed against faulty workmanship for a
period of 2 years from the date of dispatch.
Our obligation assumed under this guarantee is limited to the replacement of parts
which, by our examination, are proved to be defective and have not been misused, carelessly
handled, defaced or damaged due to incorrect installation. This guarantee is VOID where the
unit has been opened, tampered with or if repairs have been made or attempted by anyone
except an authorised representative of the manufacturing company.
Products for attention under guarantee (unless otherwise agreed) mustbereturnedto
themanufacturer freight paid and, if accepted for free repair, will be returned to the customers
address in Australia free of charge.
When returning the product for service or repair a full description of the fault and the
mode of operation used when the product failed must be given.
In any event the manufacturer has no other obligation or liability beyond replacement or
repair of this product.
Modifications may be made to any existing or future models of the unit as it may deem
necessary without incurring any obligation to incorporate such modifications in units previously
sold or to which this guarantee may relate.
Page 16 of 16 HH4PHMAN-1.0-2
This document is the property of
the instrument manufacturer
and may not be reproduced in whole or part without the
written consent of the manufacturer.
This product is designed and manufactured in Australia.