WalkLAB HP9000 User manual
Operations Manual
WalkLAB
pH–mV/ORP-
temperature meter
HP9000
16,1,16,1,2,15,2,15,14,3,14,3,4,13,4,13,12,5,12,5,6,11,6,11,10,7,10,7,8,9,8,9
TABLE OF CONTENTS PAGE
1. INTRODU TION 1
1.1 Features 1
1.2 Technical Specifications 2
2. FRONT PANEL DES RIPTION 3
2.1 Display Symbols 4
2.2 Touch Keys 4
2.3 Error odes 5
3. GETTING STARTED 6
3.1 Unpacking 6
3.2 Setting Up 6
4. ALIBRATION PRO EDURE 6
4.1 alibration with Temperature Probe 7
4.2 alibration without Temperature Probe 8
5. MEASUREMENT 9
5.1 pH Measurement with Temperature Probe 9
5.2 pH Measurement without Temperature Probe 10
5.3 Temp Measurement 11
5.4 mV Measurement 11
6. BUFFER SOLUTION REFEREN E TABLE 12
7. OPTIONAL A ESSORIES 12
8. WARRANTY 13
1. INTRODUCTION
Your HP9000 pH Meter utilizes an advanced embedded
Microprocessor chip as the heart and brain of the
Instrument. It incorporates Analog/Digital onverter,
omputing, and Display into one micro-chip. This
increases the reliability and greatly reduces the power
consumption.
1.1 Features
Lo Po er Consumption
Unit requires very low power in “OFF” and ‘AUTOLO K”
mode.
Ease of use
Automatically lock reading when a stable reading is
established. Feature can be disabled to allow continuous
reading display.
Automatic shut-off
Meter automatically shuts off after 5 minutes after last key
command. Feature can be disabled while reading in
continuous read mode.
One-touch calibration
The meter’s one-touch auto-calibration procedure uses
only one button to activate the mode. The unit will prompt
and confirm offset and slope point calibration.
1
1.2 Technical Specifications
Range Resolution Accuracy
PH 0.00 to 14.00 0.01pH ±0.01pH
mV -999 to +999 1mV ±1mV
Temp 0° to 99.9 ° 0. 1° 0. 5°
Automatic Temperature : 0° to 99.9 °
ompensation
Buffer Recognition : pH 7, pH 4 or pH 10
Buffer Temperature Range : 0° to 60°
Electrode Slope Recognition : ±20% at pH 4
or pH 10 @25°
Electrode Offset : ±60 mV at pH 7 @25°
Recognition
Power Source : 9 Volt Alkaline Battery
Battery Life : 250 Hrs ontinuous
Reading
Size : 163 x 83 x 32 mm
Weight : Approx. 350g
2
2. FRONT PANEL DESCRIPTION
3
Main Display
Temperature
Display
Temperature
Probe
pH Electrode
2.1 DISPLAY SYMBOL
- Wait indicator
AUTOLOCK - Stabilized reading indicator
MANUAL - Manual temperature compensation mode
indicator
ATC - Automatic temperature compensation
mode indicator
OFFSET - alibration mode offset point indicator
SLOPE - alibration mode slope point indicator
- Low Battery indicator
2.2 TOUCH KEYS
ON / OFF
The ON/OFF key turns the instrument on and off. When switch
ON, display will show the present reading in AUTOLO K mode.
MODE
The MODE key selects reading from pH to mV display. During
calibration, MODE selection will be temporarily disabled.
READ / AUTO
The READ/AUTO key activates input of pH or mV reading and
will auto-lock when reading is stable. To enable continuous
reading, press and hold this key for 3 seconds. To return to
AUTOLO K reading, press the key once. (Note: in continuous
reading mode, automatic shut-off is disabled).
4
CAL
The AL key activates calibration mode. Press once and the
display will prompt for the calibration steps.
TEMP SET / DIGIT ADV
The TEMP SET and DIGIT ADV Key are used to set temperature
compensation manually. Press TEMP SET key once will allow
selection of digit to flash momentarily. Press again, the next
digit will flash. Select the digit you wish to change while it
flashes and press the DIGIT ADV key to advance the digit.
Digit will advance at each press of the key. Digit will not
advance by double pressing or press and hold the key.
2.3 ERROR CODES
ER 1 – pH out of range: pH less than 0 or more than 14.00 pH.
mV out of range: mV less than –999 or above +999 mV.
ER 2 – alibration buffer solution’s temperature below 0° or
above 60° .
ER 3 – Test sample solution’s temperature below 0° or
above 100° .
ER 4 – Unrecognized OFFSET standard solution or unstable
readings:-
Wrong calibration buffer solution 7.00pH
Bad pH electrode results in erratic readings
Large fluctuation of temperature readings
ER 5 – Unrecognized SLOPE standard solution or unstable
readings:-
Wrong calibration buffer solution 4.01pH
Wrong calibration buffer solution 10.01pH
Bad pH electrode results in erratic readings
Large fluctuation of temperature readings
5
3. GETTING STARTED
3.1 Unpacking
Your instrument is shipped with a pH electrode, a temperature
probe, buffer solution pH 7.00 , buffer solution pH 4.01 and this
manual. heck the items carefully and contact the place of
purchase immediately if anything is missing or damaged.
3.2 Setting Up
3.2.1 Pull the latch of battery cover located at bottom rear
of instrument and pull out the battery. Unwrap the
battery, attach the battery clip onto it and put it back
into the battery compactment. Finally close the
battery cover.
3.2.2 Plug the temperature probe and pH electrode into
their respective connectors on the side of the
instrument.
3.2.3 Next, you must calibrate the instrument. Follow the
calibration procedure in step 4. Always switch on the
instrument for about 10 minutes to allow the internal
circuitry to stablize before taking any calibration or
measurement
4. CALIBRATION PROCEDURE
To keep measurement accurate and precise, it is best to
calibrate the instrument each time before a series of
measurements. Use standard buffer solution with temperature
coefficient as in Buffer Solution Reference Table (Page 16).
Prepare one distilled or de-ionized water for rinsing and two
sets of buffer solution, one for rinsing and the other for
calibration. This will prevent carry-over of solution during
calibration.
6
4.1 Calibration ith Temperature Probe
4.1.1 Rinse the pH electrode and temperature probe in
distilled water and switch on the instrument. OFFSET
and SLOPE indicator will alternate if no calibration is
registered in the memory.
4.1.2 Press the AL key. The OFFSET indicator will flash
momentarily.
4.1.3 Rinse the pH electrode and temperature probe in pH
7.00 rinsing solution and dip into pH 7.00 calibration
solution. Once the instrument detected the correct
offset buffer, the OFFSET indicator will stop flashing and
the offset reading will be displayed.
4.1.4 Now the instrument is performing a multiple data
sampling. It will take a little longer time for an accurate
calibration point.
4.1.5 When OFFSET point is established, the instrument will
beep and the SLOPE indicator will flash.
4.1.6 Rinse the pH electrode and temperature probe in
distilled water and then pH 4.01 or 10.01 rinsing solution.
Dip the pH electrode and temperature probe in pH
4.01 or 10.01 calibration solution.
4.1.7 The SLOPE indicator will stop flashing when the
instrument detects the correct slope buffer and will
display the buffer reading.
4.1.8 When the SLOPE point is established, the instrument will
beep and AUTOLO K indicator appears. alibration is
completed.
4.1.9 For every successive calibration, the instrument will
retain the last calibration data until the next calibration.
7
4.2 Calibration ithout Temperature Probe
4.2.1 Remove the temperature probe connected to the
instrument. The temperature display will show a default
reading of 25.0° .
4.2.2 Set the instrument to display the temperature of the
buffer 7.00 by pressing the TEMP SET key once. The
temperature digit will flash momentarily. Press the key
again, the next digit will flash. Select the digit you wish
to change while it flashes and press the DIGIT ADV key
to advance the digit. Digit will advance at each press
of the key. Digit will not advance by double pressing.
4.2.3 After setting the temperature, rinse the pH electrode in
distilled water. Dip the pH electrode into the pH 7.00
rinsing solution and then into the pH 7.00 calibration
solution and press the AL key. The OFFSET indicator will
flash momentarily. Once the instrument detected the
correct offset buffer, the OFFSET indicator will stop
flashing and offset value will be displayed.
4.2.4 Now the instrument is performing a multiple data
sampling. It will take a little longer time for an accurate
calibration point.
4.2.5 When OFFSET point is established, the instrument will
beep and the SLOPE indicator will flash.
4.2.6 Repeat step 4.2.2 to set the temperature of the slope
buffer if required.
4.2.7 Rinse the pH electrode in distilled water and then pH
4.01 or 10.01 rinsing solution. Dip the pH electrode in pH
4.01 or 10.01 calibration solution.
4.2.8 The SLOPE indicator will stop flashing when the
instrument detects the correct slope buffer and will
display the buffer reading.
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