Instruction Manual
pH 300
pH 301
pH 302
Microprocessor
GLP Bench-top
pH/mV/ISE/°C Meters
Rel mV ppm pH DATE TIME
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pH302 |
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pH METER |
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These Instruments are in |
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h t t p : / / w w w . h a n n a i n s t . c o m |
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Compliance with the CE Directives |
1
Dear Customer, |
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Thank you for choosing a Hanna Instruments |
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Product. |
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Please read this instruction manual carefully be- |
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fore using the instrument. |
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This manual will provide you with all the neces- |
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sary information for the correct use of the instru- |
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ment, as well as a precise idea of its versatility |
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in a wide range of applications. |
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These instruments are in compliance with CSA, |
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UL and |
(EN 50081-1 and EN 50082-1) |
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directives. |
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TABLE OF CONTENTS |
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Preliminary |
Examination ................................... |
1 |
General Description .......................................... |
1 |
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Functional Description pH300 .......................... |
2 |
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Specifications pH300 ........................................ |
4 |
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Functional Description pH301 .......................... |
5 |
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Specifications pH301 ........................................ |
7 |
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Functional Description pH302 .......................... |
8 |
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Specifications pH302 ...................................... |
10 |
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The Rear Panel ................................................ |
11 |
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LCD Functional Description ............................. |
11 |
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Operational Guide ........................................... |
12 |
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pH Calibration ................................................. |
29 |
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pH Values at Various Temperature ................. |
39 |
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ION Calibration (for pH301 only) ..................... |
40 |
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mv Calibration ................................................. |
44 |
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Temperature Calibration ................................. |
50 |
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Logging with pH301 ........................................ |
55 |
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Programming Functions with pH302 .............. |
58 |
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Interface with PC ............................................. |
82 |
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Troubleshooting Guide ................................... |
83 |
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Electrode Conditioning and Maintenance ...... |
84 |
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Temperature-Resistance Correlation |
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for HANNA pH Sensitive Glass ....................... |
88 |
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Additional Information about |
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Interface with PC ............................................. |
90 |
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Accessories |
..................................................... |
99 |
Electrode Application Reference Guide ........ |
107 |
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Warranty ......................................................... |
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108 |
CE Declaration of Conformity ...................... |
109 |
ISO 9000 Certified
Company since 1992
PRELIMINARY EXAMINATION
Remove the instrument from the packing material and examine it to make sure that no damage has occurred during shipping. If there is any damage, notify your Dealer.
Each pH meter comes supplied complete with:
•HI 1131B glass-body combination pH electrode
•HI 7669/2W temperature probe
•HI 3131B glass-body platinum ORP electrode
•pH 4.01 & 7.01 buffer solutions (20 mL each)
•12VDC adapter (HI710005 or HI710006)
•5 paper rolls (pH 302 only)
The KIT version includes also:
•HI76405 electrode holder
•HI 92000 Windows® compatible application software
•HI 920010 PC connection cable
•Storage, cleaning and electolyte solutions
Note: Save all packing material until you are sure that the instrument functions correctly. All defective items must be returned in the original packing with the supplied accessories.
GENERAL DESCRIPTION
Hanna Instruments pH300, pH301 and pH 302 are professional bench-top pH meters for pH, ORP (Oxidation Reduction Potential), ISE and temperature measurements. Their built-in microprocessor ensures accurate and userfriendly operation.
pH measurements are automatically compensated for the temperature effect (ATC). These meters come equipped with a large, easy-to-read LCD which shows the pH or mV or ION (for pH 301 only) with temperature simultaneously. The display has graphic symbols to make the calibration procedure easy to follow. Calibration is not allowed until the electrode has stabilized to ensure accurate measurements.
Through the RS 232 serial port you can transfer sample measurements to a PC.
2 |
3 |
FUNCTIONAL DESCRIPTION pH 300
THE FRONT PANEL
Rel mV ppm pH DATE TIME
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°C mV ppm pH INTV |
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CAL |
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COMM |
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RANGE |
CAL DATA |
pH300 |
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pH METER |
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CAL |
°C |
MS |
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CFM |
°C |
MR |
Rel mV ppm pH DATE TIME
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°C mV ppm pH INTV |
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COMM |
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RANGE |
CAL DATA |
pH300 |
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pH METER |
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CAL |
°C |
MS |
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CFM |
°C |
MR |
•ON to turn the meter on
•OFF to turn the meter off
•Power LED to confirm the meter is on
Keyboard on the Left
•COMM to display the current baud rate for RS232.
Keyboard on the Right
•!°C and "°C to manually set temperature (when the temperature probe is not connected) and to select the calibration buffer, the baud rate, the command prefix.
•CAL to enter and exit the calibration mode. After the pH calibration, to enter the calibration date, use this key to toggle between month, day and year.
•CAL DATA to display the date of last pH calibration. This also displays the offset and the slope values expressed in mV.
•CFM to confirm calibration values and to confirm baud rate and command prefix during communication setting mode.
•MR to recall the stored value.
•MS to hold and memorize the measured value. The last reading will be frozen on the display until the key is released. At the same time this reading is stored in the memory.
•RANGE to select the measurement range (pH or mV).
4 |
5 |
SPECIFICATIONS pH 300
Range |
pH |
0.00 to 14.00 |
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ISE |
±399.9 mV |
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ORP |
±1999 mV |
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°C |
-9.9 to 120.0 |
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Resolution |
pH |
0.01 |
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ISE |
0.1 mV |
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ORP |
1 mV |
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°C |
0.1 |
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Accuracy |
pH |
±0.01 |
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(@20°C/68°F) |
ISE |
±0.2 mV |
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ORP |
±1mV |
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°C |
±0.5 |
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Typical EMC |
pH |
±0.01 |
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Deviation |
ISE |
±0.6 mV |
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ORP |
±1 mV |
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°C |
±0.5 |
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pH Calibration |
Automatic 1 or 2 points with |
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3 memorized buffers |
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(4.01, 7.01, 10.01) |
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pH Offset |
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Max ±60mV or ±1pH |
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pH Slope |
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70-108% |
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Temperature |
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Automatic 1 or 2 points with |
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Calibration |
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2 memorized values |
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(0and50°C) |
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Temperature |
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Automatic or manual |
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Compensation |
from -9.9 to 120°C (14 to 248°F) |
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Electrode |
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HI 1131B glass body combination |
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refillable pH electrode (included) |
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Temperature |
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HI 7669/2W with 1 m |
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(3.3') cableincluded( |
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Input impedance |
1012 Ω |
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Computer |
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RS 232 (optoisolated) |
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Interface |
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Power supply |
12 VDC (CSA, UL & CE approved) |
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Environment |
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0 to 50°C (32 to 122°F); 95% RH |
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Dimensions |
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280x200x75mm (11x7.9x3") |
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Shipping Weight |
1.3 kg (2.9 lb.) |
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FUNCTIONAL DESCRIPTION pH 301
THE FRONT PANEL
Rel mV ppm pH DATE TIME
CFM MEM
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°C mV ppm |
pH INTV |
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CAL |
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LOG |
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CAL DATA |
pH301 |
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pH / ION |
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METER |
pH |
ION |
°C |
0.00/0.000 |
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°C |
Rel mV ppm pH DATE TIME
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°C mV ppm |
pH INTV |
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CAL |
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LOG |
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LOG |
CAL DATA |
pH301 |
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pH / ION |
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METER |
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pH |
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°C |
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CAL |
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0.00/0.000 |
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CFM |
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•ON to turn the meter on
•OFF to turn the meter off
•Power LED to confirm the meter is on
6 |
7 |
Keyboard on the Left
•CAL to start the calibration mode for pH, mV and ION. To set or quit the date or time setting mode. Used also during logging (to start logging press pH, mV or ION plus LOG plus CAL key; to stop logging press LOG plus CAL key).
•CFM to confirm calibration values.
•COMM to display the current baud rate and command prefix for RS232.
•DATE to display the date.
•RANGE to display the calibration buffer or the temperature on the secondary LCD during calibration. During setting of the date, to toggle between month, day and year. During setting of the time, to toggle between minutes, seconds and logging interval.
•TIME to display the time.
Keyboard on the Right
•!°C and "°C to manually set temperature (when the temperature probe is not connected) and to select the calibration buffer, the date and time, the baud rate, the command prefix.
•CAL DATA to display the date of last pH calibration. This also displays the offset and the slope 1 or slope 2 values expressed in mV.
•ION to select the ION measurement range.
•mV to select the mV measurement range.
•pH to select the pH measurement range.
•.00/.000 to select two or three decimal points for pH measurements.
SPECIFICATIONS pH 301
Range |
pH |
-1.999 to 19.999 |
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m V |
±1999.9 |
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p p m |
0.001 to 19999 |
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°C |
-9.9 to 120.0 |
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Resolution |
pH |
0.01 or 0.001 |
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m V |
0.1 |
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p p m |
0.001 (from 0.001 to 9.999) |
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0.01 (from 10.00 to 99.99) |
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0.1 (from 100.0 to 999.9) |
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1 (from 1000 to 19999) |
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°C |
0.1 |
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Accuracy |
pH |
±0.002 |
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(@20°C/68°F)m V |
±0.1 (±799.9) / ±0.2 (±1999.9) |
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p p m |
±0.5% |
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°C |
±0.5 |
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Typical EMC pH |
±0.01 |
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Deviation |
mV |
±0.3 |
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p p m |
±1% |
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°C |
±0.5 |
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pH Calibration |
Automatic 1, 2 or 3 points with |
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6 memorized buffers |
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(1.68, 4.01, 6.86, 7.01, 9.18, 10.01) |
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pH Offset |
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Max ±60mV or ±1pH |
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pH Slope |
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70-108% |
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ppm Calibration |
Automatic 1 or 2 points with |
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5 memorized buffers |
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(0.1, 1, 10, 100, 1000) |
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ppm Offset |
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Max ±1999.9mV |
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ppm Slope |
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From ±20mV to ±100 mV |
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[mV/log(0.001xppm)] |
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Temperature |
Automatic 1 or 2 points with |
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Calibration |
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2 memorized values (0 and 50°C) |
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Temperature |
Automatic or manual (for pH only) |
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Compensation |
from -9.9 to 120°C (14 to 248°F) |
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Electrode |
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HI 1131B glass body combination |
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refillable pH electrode (included) |
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Temperature |
HI 7669/2W with 1 m |
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probe |
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(3.3') cable included( |
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Input impedance |
1012 Ω |
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Logging Interval |
1, 15, 30 seconds or |
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1, 5, 30, 60, 120, 180 minutes |
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PC Interface |
RS 232 (optoisolated) |
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Power supply |
12 VDC (CSA, UL & CE approved) |
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Environment |
0 to 50°C (32 to 122°F); 95% RH |
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Dimensions |
280x200x75mm (11x7.9x3") |
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Shipping Weight |
1.3 kg (2.9 lb.) |
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8 |
9 |
FUNCTIONAL DESCRIPTION pH 302
THE FRONT PANEL
Rel mV ppm pH DATE TIME
CFM MEM
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°C |
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CAL |
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LOG |
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PAPER |
pH302 |
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pH METER |
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RANGE |
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Rel mV ppm pH DATE TIME
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CFM MEM |
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°C mV ppm pH INTV |
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PAPER |
pH302 |
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pH METER |
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RANGE |
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PGM |
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CLEAR |
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•ON to turn the meter on
•OFF to turn the meter off
•Power LED to confirm the meter is on
Keyboard on the Left
•0 to 9 for numeric and decimal data input.
•CLEAR to cancel wrong data entry during programming.
Keyboard on the Right
•CAL to perform the pH, mV or temperature calibration.
•CFM/! to confirm pH/mV/temperature calibration values or to manually set temperature (when the temperature probe is not connected).
•ENTER/"°C to terminate the numeric data entry or to manually set temperature (when the temperature probe is not connected) or to select the buffer value during pH calibration.
•PAPER to pull the paper.
•PGM to select a program.
•PRINT to obtain a printout (prints time, date, sample number and pH or mV values).
•RANGE to select the measurement range (pH or mV) or to display the calibration buffer or the temperature on the secondary LCD during calibration.
•TIME to display the time and the date.
10 |
11 |
SPECIFICATIONS pH 302
Range |
pH |
0.00 to 14.00 |
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ISE |
±399.9 mV |
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ORP |
±1999 mV |
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°C |
-9.9 to 120.0 |
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Resolution |
pH |
0.01 |
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ISE |
0.1 mV |
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ORP |
1 mV |
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°C |
0.1 |
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Accuracy |
pH |
±0.01 |
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(@20°C/68°F) |
ISE |
±0.2 mV |
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ORP |
±1mV |
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°C |
±0.5 |
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Typical EMC |
pH |
±0.01 |
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Deviation |
ISE |
±0.3 mV |
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ORP |
±1 mV |
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°C |
±0.5 |
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pH Calibration |
Automatic 1, or 2 points with |
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3 memorized buffers |
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(4.01,7.01,10.01) |
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Temperature |
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Automatic 1 or 2 points with |
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Calibration |
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2 memorized values |
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(0and50°C) |
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Temperature |
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Automatic or manual |
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Compensation |
from -9.9 to 120°C (14 to 248°F) |
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(for pH only) |
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Electrode |
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HI 1131B glass body combination |
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refillable pH electrode (included) |
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Temperature |
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HI 7669/2W with 1 m |
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probe |
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(3.3') cableincluded( |
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Input impedance |
1012 Ω |
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Printer |
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Dot matrix, 44mm wide paper |
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Languages |
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English, German, French, |
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Spanish, Italian & Swedish |
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PC Interface |
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RS 232 (optoisolated) |
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Power supply |
12 VDC (CSA, UL & CE approved) |
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Environment |
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0 to 50°C (32 to 122°F); 95% RH |
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Dimensions |
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280x200x75mm (11x7.9x3") |
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Shipping Weight |
1.3 kg (2.9 lb.) |
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THE REAR PANEL
REFERENCE |
MEASUREMENT TEMPERATURE RESET 12VDC |
RS 232 |
ELECTRODE |
ELECTRODE PROBE |
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ooooo |
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oooo |
1 2 3 4 5 6
1.Reference Electrode Connector (Ø 4 mm)
2.BNC socket for measurement electrode
3.Socket for Temperature Probe
4.Reset Button
5.DC Power Socket (for HI710005 or
HI710006)
6.RS 232 Connector
LCD FUNCTIONAL DESCRIPTION
Primary Display
Rel mV ppm pH DATE TIME
CFM MEM
WRONG |
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°C mV ppm pH INTV |
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CAL |
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1 |
m |
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BUF |
2 |
s |
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LOG |
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3 |
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Secondary Display
12 |
13 |
OPERATIONAL GUIDE
ELECTRODE AND PROBE CONNECTIONS
For combination pH or ISE or ORP electrodes (with internal reference) plug the electrode's BNC to the socket provided (see page 11).
For electrode with separate reference, connect the measuring electrode's BNC to the BNC socket and the reference electrode's plug to the socket provided (see page 11).
For temperature measurements and automatic temperature compensation connect the temperature probe to the °C socket (see page 11).
If the temperature probe |
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is not connected, when |
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turned on, the meter will |
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display a default tem- |
°C |
perature of 25°C or the |
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last recorded tempera- |
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ture (if the temperature probe is disconnected when the meter is on) on the secondary LCD. The "°C" indicator will be flashing.
POWER CONNECTION
Plug the 12VDC adapter (HI710005 or HI710006) into the DC socket (see page 11). Plug the adapter to the mains.
Note: The instrument uses the following configuration.
+ -
It is recommendable to use the Hanna HI710005 or HI710006 voltage adapters (sup-
plied with the meters) that use the proper polarity configuration.
The meters can also be used with other adapters. In this case, remember to check the correct polarity of your adapter before connecting it to the meter.
Note: Make sure the main line is protected by a fuse.
Press ON to turn the meter on. The power LED will remain lit until OFF is pressed to turn the meter off.
ON |
OFF |
When the meters are turned on, the microprocessor checks if any calibration data is in memory (i.e. if the offset is within ±60mV and the slope between 70-108%).
If the calibration data is |
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valid, the meter will op- |
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pH |
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erate in the normal mea- |
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surement mode and de- |
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°C |
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fault to pH measurement |
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mode with the tempera- |
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ture on the secondary LCD. |
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If the calibration data is |
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not valid or the calibra- |
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pH |
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tion data is lost, the |
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"CAL" indicator will be |
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°C |
displayed to prompt the |
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CAL |
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user to perform the pH |
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calibration. If the user chooses not to perform the calibration and presses CAL to quit from the calibration mode, the offset and the slope of the instrument would be set to 0 mV and 100% respectively.
14 |
15 |
pH300, pH301 and pH302 use an EEPROM to retain the pH calibration, mV calibration, temperature calibration as well as the serial communication setting. The instrument will store the respective data after a calibration or serial communication setting, even when it is not plugged-in.
For pH 302 only
pH302 uses a rechargeable battery to retain the pH calibration data. It lasts approximately one month when fully charged. The battery is automatically charged any time the meter is plugged-in (either turned on or off).
If you need to unplug the instrument, press OFF before OFF disconnecting the meter from
the mains. Only in this case will the instrument retain the memorized data. Otherwise, the instrument needs to be
re-calibrated. In the case of a power failure while the instrument is operational, re-cali- bration is required.
When the instrument is initially switched on, the microprocessor checks if any calibration data is in memory (i.e. if the offset is within ±1 pH and the slope between 70 - 108%).
If the calibration data are not memorized, the offset and slope of the instrument will be set to 0 mV and 100% respectively.
SETTING THE DATE AND THE TIME AND THE LOGGING INTERVAL (for pH 301 only)
Press DATE to display the date. The month and the day will be displayed on the primary LCD, the year on the secondary one.
DATE |
DATE |
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Press CAL to enter the setting mode and the month will be flashing.
CAL |
DATE |
Use UP or DOWN to select the month.
°C |
°C |
Press RANGE and the day will start to flash.
RANGE |
DATE |
Use UP or DOWN to select the day.
°C |
°C |
Press RANGE and the year on the secondary LCD will flash.
DATE
RANGE
Use UP or DOWN to select the year.
°C |
°C |
16 |
17 |
CAL
Press CAL to exit the date setting mode.
Press TIME to display the time. The hour and the minutes will be displayed on the primary LCD, the logging interval on the secondary one.
TIME |
TIME |
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INTV |
Press CAL to enter the setting mode and the hour will flash.
CAL |
TIME |
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INTV |
Use UP or DOWN to select the hour.
°C |
°C |
Press RANGE and the minutes will flash.
RANGE
TIME
INTV
Use UP or DOWN to select the minutes.
°C |
°C |
Press RANGE and the logging interval on the secondary LCD will come up.
RANGE |
TIME |
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INTV |
Use UP or DOWN to select the logging interval. °C °C
CAL
Press CAL to exit the time setting mode.
VIEWING THE DATE AND THE TIME (for pH 301 only)
Press DATE to display the date. The month and the day will be displayed on the primary LCD, the year on the secondary one.
DATE |
DATE |
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Press TIME to display the time. The hour and the minutes will be displayed on the primary LCD, the logging interval on the secondary one.
TIME |
TIME |
INTV
s
18 |
19 |
SETTING THE DATE AND THE TIME AND THE LOGGING INTERVAL (for pH 302 only)
See program No. 1 (page 60).
VIEWING THE DATE AND THE TIME (for pH 302 only)
Press TIME to display the time (HH/MM).
TIME
Press TIME again to display the date (MM/
DD).
TIME
DATE
TAKING pH MEASUREMENTS
Make sure that the instrument has been calibrated for pH before taking pH measure-
ments (see page 29). |
RANGE |
For pH 300 and pH 302 only:
Select the pH measurement mode by pressing RANGE.
For pH 301 only:
Select the pH measurement mode by pressing pH.
To take a pH measurement simply submerge the tip (4cm/ 1½ ") of the pH electrode and the temperature probe into the sample to be tested.
pH
4 cm (1½ ")
Allow 1 or 2 minutes for |
pH |
the electrode to stabi- |
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lize. |
°C |
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pH is displayed on the primary display and tem-
perature on the second-
pH
ary one.
If readings are out of range "---" will appear on the LCD display.
For pH 301 only:
Press the .00/.000 key to change the resolution from two to three decimal points.
0.00/0.000
pH
°C
It is recommended that the electrode is rinsed thoroughly for better conditioning. For this rinsing process, it is recommended to use a liberal amount of the sample to be measured.
If measurements are taken in different samples successively, it is recommended that the electrode and the temperature probe are rinsed thoroughly with deionized water or distilled water (if not available, tap water may also be used) and then blot dry between each measurement.
The pH reading is directly effected by temperature. In order for the meter to measure the pH accurately, temperature must be taken into consideration.
A perfect equilibrium between the pH electrode and the sample is reached in approximately 15 minutes.
To use the meter'sAutomatic Temperature Compensation feature, submerge the HI7669/2W temperature probe into the sample
20 |
21 |
as close to the electrode as possible and wait for 1-2 minutes.
If you know the temperature of the sample to be tested you can compensate for it manually.
If manual temperature compensation is desired the temperature probe must be disconnected from the instrument.
The display will then show the default temperature of 25°C or the last recorded temperature reading. "°C" is blinking.
Note the temperature of the sample using a ChecktempC or a glass thermometer.
The temperature can now be adjusted with UP and DOWN.
If the temperature
°C
probe is connected to |
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the meter, the second- |
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ary LCD figure dis- |
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plays the measured |
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temperature reading |
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and the "°C" indicator |
CFM/ |
does not blink. Press- |
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ing UP or DOWN will |
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not alter the tempera- |
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ture reading. |
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°C
°C
°C
ENTER/
VIEWING THE pH CALIBRATION DATA
For pH 300:
Press CAL DATA and the meter will display the last pH calibration data.
CAL DATA
Press UP or DOWN to get this information in the following sequence:
°C |
°C |
a.Date of the last pH calibration (month, day and year)
b.Offset calibration value expressed in mV and displayed on the primary LCD with the buffer used to calibrate the offset on the secondary LCD.
DATE
CAL
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mV |
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pH |
CAL |
1 |
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The offset pH value should be between ±30 mV. For values between ±30 and ±60 mV change the reference electrolyte and repeat the calibration procedure. For values higher than +60 mV or lower than -60 mV the electrode is no longer reliable. See the electrode maintenance section on page 84.
c. Slope |
calibration |
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mV |
value |
directly ex- |
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pressed in mV/pH is |
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displayed on the pri- |
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pH |
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mary LCD with the |
CAL |
2 |
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2nd buffer used to |
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calibrate the offset on the secondary LCD. |
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For pH 301: |
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Press pH followed by |
pH |
CAL DATA |
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CAL DATA and the |
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meter will display the |
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last pH |
calibration |
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data. |
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22 |
23 |
Press UP or DOWN to get this information in the following sequence:
°C |
°C |
a.Date of the last pH calibration (month, day and year)
b.Time when the last pH calibration was completed (hour and minutes).
DATE
CAL
TIME
CAL
c. Offset |
calibration |
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mV |
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value |
expressed in |
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mV and displayed on |
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the primary LCD |
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pH |
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with the buffer used |
CAL |
1 |
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to calibrate the off- |
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set on the secondary LCD. |
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The offset pH value should be between ±30 mV. For values between ±30 and ±60 mV change the reference electrolyte and repeat the calibration procedure. For values higher than +60 mV or lower than -60 mV the electrode is no longer reliable. See the electrode maintenance section on page 84.
d. Acid slope calibra- |
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mV |
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tion value expressed |
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in mV/pH and dis- |
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played on |
the pri- |
pH |
mary LCD |
with the |
2 |
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CAL |
2nd buffer used to |
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calibrate the offset on the secondary LCD. |
e. Alkaline slope calibra-
tion value expressed |
mV |
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in mV/pH and dis- |
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played on the primary |
pH |
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LCD |
with |
the |
3rd |
CAL |
buffer |
used |
to |
cali- |
3 |
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brate the offset on the secondary LCD.
For pH 302:
See program #3 (page 66).
TAKING REDOX MEASUREMENTS
pH300, pH301 and pH302 have the capability to take ORP measurements. An optional ORP electrode must be used to perform these measurements (see page 105).
RANGE
For pH 300 or pH 302:
To get into the mV mode (ORP), press RANGE.
mV
For pH 301:
To get into the mV mode, press mV.
To measure the mV of a so- |
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lution simply submerge the |
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ORP electrode tip (4 cm/1½ ") |
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into the sample to be tested. |
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Allow a few minutes for the |
(1½") |
4cm |
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reading to stabilize. |
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The display will indicate the absolute mV value (positive or negative).
For pH 300 and pH 302 only:
When values are less than ±400 mV, tenths of mV are displayed; for values greater than ±400 mV, the decimal digit disappears.
Rel mV
°C
24 |
25 |
Note that the change in scale (from 0.1 mV to 1 mV as resolution) is automatic.
For all models: |
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Rel mV |
"---" appears if the value exceeds ±1999 mV (out of range).
Oxidation-reduction potential (REDOX) measurements provide the quantification of the oxidizing or reducing power of the sample tested.
To correctly perform a redox measurement, the surface of the ORP electrode must be clean and smooth.
When not in use, the tip of the electrode should be kept moist and safe from any mechanical stress which might cause damage to the gold/platinum junction.
TAKING ION MEASUREMENTS
pH 300, pH 301 and pH302 have the capability to take ION measurements. An optional ISE electrode must be used to perform these measurements. RANGE
For pH 300 or pH 302:
To get into the mV mode (ORP or ISE), press RANGE.
ION
For pH 301:
To get into the ION mode, press
ION.
Simply submerge |
the ISE |
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electrode tip (4 cm/1½ ") into |
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the sample to be tested. Al- |
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low a few minutes for the read- |
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ing to stabilize. |
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(1½") 4cm |
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For pH 300 and pH 302:
The display will indicate the absolute mV value (positive or negative).
When values are less |
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Rel mV |
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than ±400 mV, tenths of |
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mV are |
displayed; for |
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°C |
values |
greater than |
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±400 mV, the decimal |
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digit disappears. Note that the change in scale (from 0.1 mV to 1 mV as resolution) is automatic.
For pH 301:
The display will indicate |
ppm |
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the ppm value expressed |
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in ppm or mV (depend- |
°C |
ing on the measured |
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sample). Note that the |
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change in scale (from 0.001ppm to 0.01ppm or 0.1 ppm as resolution) is automatic.
For all models: |
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Rel mV |
"---" appears if the value exceeds ±1999 mV (out of range).
When not in use, the tip
of the electrode should be kept moist and safe from any mechanical stress which might cause damage to the junction.
VIEWING THE ION CALIBRATION FACTOR ON THE LCD (for pH 301 only)
Press ION followed |
ION |
CAL DATA |
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by CAL DATA and |
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the meter will display |
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the last ION cali- |
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bration data. |
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°C |
°C |
Press UP or DOWN to get this information in the following sequence:
26 |
27 |
a.Date of the last ION calibration (month, day and year)
b.Time when the last ION calibration was completed (hour and minutes)
c.Offset calibration value expressed in mV and displayed on the primary LCD with the value used to calibrate the offset on the secondary LCD.
DATE
CAL
TIME
INTV
CAL
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mV |
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ppm |
CAL |
1 |
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d. Slope calibration |
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value expressed in |
mV |
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mV/[log (0.0001xppm)] |
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and displayed on the |
ppm |
primary LCD with |
2 |
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CAL |
the 2nd value used to |
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calibrate the slope on the secondary LCD. |
TAKING TEMPERATURE MEASUREMENTS
Taking a temperature measurement is very easy. ON
Connect the temperature probe to the instrument and turn the instrument ON.
Dip the liquid/general purpose temperature probe HI7669/2W into the sample
Allow the reading on the secondary display to stabilize (1 or 2 minutes).
pH
°C
PRINTING FUNCTION (for pH 302 only)
Press PRINT to get a printout at |
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any time. |
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All the printouts will be complete |
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with date, time, sample No., tem- |
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perature and measurement value |
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(pH or mV depending on the se- |
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lected measurement range). |
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DATE |
1/02 |
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TIME |
12:21 |
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SAMPLE |
1 |
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°C |
17.9 |
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pH |
7.18 |
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DATE |
1/02 |
TIME |
12:40 |
SAMPLE |
5 |
°C |
20.5 |
mV |
-350.0 |
HOLD FUNCTION (for pH 300 only)
To hold and memorize the measured value, press MS. The last reading will be frozen on the display until the key is released. At the same time, this reading is stored in the memory. During this operation, the "MEM" indicator is lit.
MS |
pH |
MEM
°C
28 |
29 |
MR
To recall the stored memory value, press MR and the memorized reading will be displayed with the MEM indicator lit.
RESET BUTTON
The RESET button (see page 11) is used when the instrument displays erroneous messages due to strong electrical interference or when the instrument's power supply was disconnected before the meter was switched off.
It is necessary to press the reset button and restart the entire operation.
Calibration points should remain memorized. It is recommended to verify calibration before proceeding.
pH CALIBRATION
For greatest accuracy, it is recommended that the instrument is calibrated frequently.
For a faster operation, it is possible to standardize the electrode at a value close to the expected sample value or at pH 7.01 only (one point calibration), but it is always good practice to calibrate at least 2 points.
For pH 301 only:
Due to electrode conditioning time the electrode must be kept immersed for a few seconds to stabilize. The meters are equipped with a stability indicator and the user will be guided step by step with easy indications on the display during the pH calibration. This will make the calibration a simple and error-free procedure.
The standard calibration program of the meter is prepared for 3 (maximum) buffers. The selectable pH values are: 1.68, 4.01, 6.86, 7.01, 9.18, 10.01.
INITIAL PREPARATION |
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Pour small quantities of |
7004 |
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HI |
pH7.01 (HI7007/HI8007) and
pH4.01 (HI7004/HI8004) and/ or pH10.01 (HI7010/HI8010)
solution into individual beakers. If possible, use plastic beakers to minimize any EMC interferences.
For accurate calibration use two beakers for each buffer solution, the first one for rinsing the electrode, the second one for calibration.
By doing |
this, |
RINSE |
CALIBRATION |
contamination |
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between |
the |
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buffers is mini- |
HI 7007 |
HI 7007 |
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mized. |
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To get accurate readings, use pH 7.01 and
30 |
31 |
pH 4.01 if you are going to measure acid samples, or pH 7.01 and pH 10.01 for alkaline measurements or, for pH 301 only, perform a 3-point calibration for the entire range.
PROCEDURE |
RANGE |
•Press RANGE (for pH 300 and pH 302) to select the pH measurement mode.
•Press pH (for pH 301) to
select the pH measure- |
pH |
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ment mode. |
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• Remove the protective cap |
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from the pH electrode. |
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ONE POINT CALIBRATION (OFFSET)
•Immerse the pH electrode into the selected buffer (e.g. pH 7.01) buffer solution and shake briefly.
Note: the electrode should be submerged approximately 4 cm (1½ ") into the solution. The temperature probe should be located as close as possible to the pH electrode.
HI 7007 |
4(1 cm") ½
•Press CAL. The primary LCD will display the pH value using the current offset and
slope, with the "CAL" and " BUF 1" indicators lit.
CAL |
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pH |
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pH |
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CAL |
1 |
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BUF |
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For pH 302 only: the printer will also print step by step instructions for the calibration procedure.
Dip the electrode in the pH 7 solution; wait 30 sec and then press CFM
•Select the buffer value by pressing UP or DOWN or just DOWN (for pH 302) until the secondary LCD displays the value of
the first solution (e.g. “7.01”).
°C |
°C |
pH
ENTER/ |
CAL |
1 |
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BUF |
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•Only when the reading is stable (less than ±0.03 variation in a 10 seconds time
1
interval) the " BUF " indicator will stop flashing (after about 30 seconds) and the "CFM" indicator will start blinking.
•Press CFM to confirm the calibration.
If the reading is not close to the selected buffer, "WRONG BUF 1" and "WRONG " will blink alternately. If the reading is close to the selected buffer (±1 pH), the meter stores the reading
CFM
CFM/
CFM
WRONG
WRONG
BUF
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(and adjusts the offset point).
The |
buffer value |
is |
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pH |
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then |
displayed |
on |
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the primary LCD and |
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pH |
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the secondary LCD |
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CAL |
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will display the ex- |
BUF 2 |
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pected second buffer value. |
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For pH 302 only: the printer will print further instructions for the calibration procedure.
Now dip the e- lectrode in 2nd solution, wait 30 sec and then
press CFM |
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• Press CAL and the calibra- |
CAL |
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tion process is ended with |
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just the offset of the meter |
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calibrated. For best accuracy |
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however, it is recommended |
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that a two-point calibration is |
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performed. |
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For pH 300 only: |
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DATE |
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The calibration process |
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is complete and the dis- |
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play will ask for the date |
CAL |
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entry. |
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°C |
°C |
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Use UP or DOWN to select the month, the day and the year.
CAL
Use CAL to toggle between month, day and year.
CFM/
After entering the calibration date, press CFM and the meter will return to the normal operating mode.
Note: during calibration, the RANGE
RANGE
secondaryLCDdisplays the selected buffer value. By pressing RANGE the temperature value can be also
displayed. This will allow you to check the buffer temperature during calibration.
TWO-POINT CALIBRATION
A two-point calibration is recommended for best accuracy. As a first point use pH 7.01 (or pH 6.86 can also be used for pH 301). As a second point use pH 4.01 (or pH1.68 for pH 301 only) if you are going to measure acid samples (pH 7 or less), use pH 10.01 (or pH 9.18 for pH301 only) if you are going to measure alkaline samples. CAL
•Proceed as described above for one point calibration but do not quit calibration by pressing CAL at the end.
•After the first calibration
point is confirmed, immerse the pH electrode into the
second buffer solution (pH 4.01 or pH 10.01; for pH301 only, the second buffer can
also be pH 1.68 or pH 9.18) and shake briefly.
Note: the electrode should |
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be submerged |
ap- |
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proximately |
4 |
cm |
(1½ 4cm ") |
(1½ ") into the |
solu- |
tion. The temperature
probe should be located as close as possible to the pH electrode.
34 |
35 |