Hanna Instruments PH 300, PH 301, PH 302 User Manual

Instruction Manual

pH300 pH301 pH302

Microprocessor

GLP Bench-top

pH/mV/ISE/°C Meters

ppm

DATE TIME

Rel mV

MEM

ON OFF

CFM

WRONG

CAL

LOG

ppmpHpH

INTV

mV°C

1 2

BUF

http://www.hannainst.com

PAPER PRINT

pH302

pH METER

RANGE CAL

CFM /

PGM

TIME

ENTER /

These Instruments are in

Compliance with the CE Directives

Dear Customer, Thank you for choosing a Hanna Instruments Product. Please read this instruction manual carefully before using the instrument. 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. These instruments are in compliance with CSA,

UL and directives.

(EN 50081-1 and EN 50082-1)

TABLE OF CONTENTS

Preliminary Examination................................... 1

General Description .......................................... 1

Functional Description pH300 .......................... 2

Specifications pH300 ........................................ 4

Functional Description pH301 .......................... 5

Specifications pH301 ........................................ 7

Functional Description pH302 .......................... 8

Specifications pH302 ...................................... 10

The Rear Panel ................................................ 11

LCD Functional Description ............................. 11

Operational Guide ........................................... 12

pH Calibration ................................................. 29

pH Values at Various Temperature ................. 39

ION Calibration (for pH301 only) ..................... 4 0

mv Calibration ................................................. 44

Temperature Calibration ................................. 50

Logging with pH301 ........................................ 55

Programming Functions with pH302 .............. 58

Interface with PC ............................................. 82

Troubleshooting Guide ................................... 83

Electrode Conditioning and Maintenance ...... 84

Temperature-Resistance Correlation

for HANNA pH Sensitive Glass ....................... 8 8

Additional Information about

Interface with PC ............................................. 90

Accessories..................................................... 99

Electrode Application Reference Guide ........ 10 7

Warranty......................................................... 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 applica-

tion 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 pH302 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 pH301 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.

FUNCTIONAL DESCRIPTION pH 300

THE FRONT PANEL

ppm

DATE TIME

Rel mV

MEM

CFM

WRONG

CAL

LOG

OFF

COMM

CFM

WRONG

CAL

LOG

ONONOFF

COMM

ppmpHpH

INTV

mV°C

1 2

BUF

ppm

Rel mV

MEM

BUF

1 2

mV°C

RANGE CAL DATA

CAL MS°C

CFM

DATE TIME

ppmpHpH

RANGE

CAL MS°C

CFM

pH METER

°C

INTV

m s

CAL DATA

pH METER

°C

pH300

Keyboard on the Left

• COMM to display the current baud rate for RS232.

Keyboard on the Right

•

!°C and

"°C to manually set tempera-

ture (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).

• ON to turn the meter on

• OFF to turn the meter off

• Power LED to confirm the meter is on

SPECIFICATIONS pH 300

FUNCTIONAL DESCRIPTION pH 301

THE FRONT PANEL

Range pH 0.00 to 14.00

ISE ±399.9 mV

ORP ±1999 mV

°C -9.9 to 120.0

Resolution pH 0.01

ISE 0.1 mV

ORP 1 mV

°C 0.1

Accuracy pH ±0.01 (@20°C/68°F) ISE ±0.2 mV

ORP ±1mV

°C ±0.5

Typical EMC pH ±0.01 Deviation ISE ±0.6 mV

ORP ±1 mV

°C ±0.5

pH Calibration Automatic 1 or 2 points with

3 memorized buffers

(4.01, 7.01, 10.01)

pH Offset Max ±60mV or ±1pH pH Slope 70-108% Temperature Automatic 1 or 2 points with

Calibration 2 memorized values

(0 and 50°C)

Temperature Automatic or manual Compensation from -9.9 to 120°C (14 to 248°F)

Electrode HI1131B glass body combination

refillable pH electrode (included)

Temperature HI 76 6 9/ 2 W with 1 m probe (3.3') cable (included)

Input impedance 1012 Ω Computer RS 232 (optoisolated)

Interface Power supply 12 VDC (CSA, UL & CE approved) Environment 0 to 50°C (32 to 122°F); 95% RH Dimensions 280x200x75mm (11x7.9x3")

Shipping Weight 1.3 kg (2.9 lb.)

ppm

DATE

Rel mV

MEM

CFM

WRONG

CAL

LOG

ONONOFF

Rel mV

CFM

MEM

WRONG

CAL

LOG

OFF

CAL

DATE COMM

RANGE

CFM

TIME

ppm

INTV

mVmV°C

1 2

BUF

LOG

CAL DATA

ION

0.00/0.000

ppm

DATE

TIME

ppm

INTV

°C

LOG

CAL DATA

ION

0.00/0.000

• ON to turn the meter on

• OFF to turn the meter off

• Power LED to confirm the meter is on

pH301

pH / ION METER

°C

pH301

pH / ION

METER

°C

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 tempera-

ture (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

mV ±1999.9

ppm 0.001 to 19999

°C -9.9 to 120.0

Resolution pH 0.01 or 0.001

mV 0.1

ppm 0.001 (from 0.001 to 9.999)

0.01 (from 10.00 to 99.99)

0.1 (from 100.0 to 999.9) 1 (from 1000 to 19999)

°C 0.1

Accuracy pH ±0.002 (@20°C/68°F)m V ±0.1 (±799.9) / ±0.2 (±1999.9)

ppm ±0.5%

°C ±0.5

Typical EMC pH ±0.01 Deviation mV ±0.3

ppm ±1%

°C ±0.5

pH Calibration Automatic 1, 2 or 3 points with

6 memorized buffers

(1.68, 4.01, 6.86, 7.01, 9.18, 10.01)

pH Offset Max ±60mV or ±1pH pH Slope 70-108% ppm Calibration Automatic 1 or 2 points with

5 memorized buffers (0.1, 1, 10, 100, 1000)

ppm Offset Max ±1999.9mV ppm Slope From ±20mV to ±100 mV

[mV/log(0.001xppm)]

Temperature Automatic 1 or 2 points with Calibration 2 memorized values (0 and 50°C)

Temperature Automatic or manual (for pH only) Compensation from -9.9 to 120°C (14 to 248°F)

Electrode HI1131B glass body combination

refillable pH electrode (included)

Temperature HI 7669/2W with 1 m probe (3.3') cable (included)

Input impedance 1012 Ω Logging Interval 1, 15, 30 seconds or

1, 5, 30, 60, 120, 180 minutes

PC Interface RS 232 (optoisolated) Power supply 12 VDC (CSA, UL & CE approved) Environment 0 to 50°C (32 to 122°F); 95% RH Dimensions 280x200x75mm (11x7.9x3") Shipping Weight 1.3 kg (2.9 lb.)

FUNCTIONAL DESCRIPTION pH 302

THE FRONT PANEL

Keyboard on the Left

• 0 to 9 for numeric and decimal data in- put.

• CLEAR to cancel wrong data entry during programming.

Rel mV

ppm

DATE TIME

Keyboard on the Right

• CAL to perform the pH, mV or tempera-

MEM

CFM

WRONG

CAL

LOG

OFF

ppmpHpH

INTV

mV°C

1 2

BUF

PAPER

pH302

pH METER

RANGE

CFM /

CAL

PGM

TIME

ENTER /

ture 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.

ppm

DATE TIME

Rel mV

MEM

CFM

WRONG

CAL

LOG

ONONOFF

CLEAR

ppmpHpH

INTV

mV°C

1 2

BUF

PAPER

pH302

pH METER

RANGE

CFM /

CAL

PGM

TIME

ENTER /

• 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.

• ON to turn the meter on

• OFF to turn the meter off

• Power LED to confirm the meter is on

1110

SPECIFICATIONS pH 302

Range pH 0.00 to 14.00

ISE ±399.9 mV

ORP ±1999 mV

°C -9.9 to 120.0

Resolution pH 0.01

ISE 0.1 mV

ORP 1 mV

°C 0.1

Accuracy pH ±0.01 (@20°C/68°F) ISE ±0.2 mV

ORP ±1mV

°C ±0.5

Typical EMC p H ±0.01 Deviation ISE ±0.3 mV

ORP ±1 mV

°C ±0.5

pH Calibration Automatic 1, or 2 points with

3 memorized buffers

(4.01,7.01,10.01)

Temperature Automatic 1 or 2 points with Calibration 2 memorized values

(0 and 50°C)

Temperature Automatic or manual Compensation from -9.9 to 120°C (14 to 248°F) (for pH only)

Electrode HI1131B glass body combination

refillable pH electrode (included)

Temperature HI 76 6 9/ 2 W with 1 m probe (3.3') cable (included)

Input impedance 1012 Ω Printer Dot matrix, 44mm wide paper Languages English, German, French,

Spanish, Italian & Swedish

PC Interface RS 232 (optoisolated) Power supply 12 VDC (CSA, UL & CE approved)

Environment 0 to 50°C (32 to 122°F); 95% RH Dimensions 280x200x75mm (11x7.9x3") Shipping Weight 1.3 kg (2.9 lb.)

THE REAR PANEL

MEASUREMENT

REFERENCE ELECTRODE

TEMPERATURE

ELECTRODE

12345 6

RESET 12VDC RS 232

PROBE

ooooo

oooo

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

CFM

CAL

LOG

Rel mV

MEM

WRONG

BUF

ppm

1 2

mV°C

ppmpHpH

DATE TIME

INTV

m s

Secondary Display

1312

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 is not connected, when turned on, the meter will display a default tem-

°C

perature of 25°C or the last recorded temperature (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 page11).

Plug the adapter to the mains.

Note: The instrument uses the following con-

figuration.

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.

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 valid, the meter will op-

erate in the normal measurement mode and default to pH measurement

°C

mode with the temperature on the secondary LCD.

If the calibration data is not valid or the calibra-

tion data is lost, the "CAL" indicator will be displayed to prompt the

CAL

°C

user to perform the pH 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.

1514

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.

Press CAL to enter the setting mode and the month will be flashing.

CAL

DATE

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-calibration 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.

Use UP or DOWN to select the month.

°C

Press RANGE and the day will start to flash.

RANGE

DATE

Use UP or DOWN to select the day.

°C

Press RANGE and the year on the secondary LCD will flash.

RANGE

DATE

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

Use UP or DOWN to select the year.

°C °C

1716

Press CAL to exit the date setting mode.

CAL

Press RANGE and the logging interval on the secondary LCD will come up.

RANGE

TIME

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

INTV

Press CAL to enter the setting mode and the hour will flash.

CAL

TIME

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 logging interval.

°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

Use UP or DOWN to select the minutes.

°C

INTV

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

1918

TIME

INTV

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

Allow 1 or 2 minutes for

the electrode to stabilize.

°C

pH is displayed on the primary display and temperature on the second-

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

°C

TAKING pH MEASUREMENTS

Make sure that the instrument has been calibrated for pH before taking pH measurements (see page 29).

For pH 300 and pH 302 only

RANGE

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.

4 cm

(1½")

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's Automatic Temperature

Compensation feature, submerge the HI7669/2W temperature probe into the sample

2120

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 tempera-

°C

ture 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 °C

probe is connected to the meter, the secondary LCD figure displays the measured temperature reading and the "°C" indicator

CFM/

ENTER/

does not blink. Pressing UP or DOWN will not alter the temperature reading.

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

a. Date of the last pH

°C

DATE

calibration (month, day and year)

b.Offset calibration

CAL

value expressed in mV and displayed on

the primary LCD with the buffer used to calibrate the offset on the secondary LCD.

CAL

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

-60mV the electrode is no longer reliable. See the electrode maintenance section on page 84.

c.Slope calibration

value directly expressed in mV/pH is displayed on the primary LCD with the

CAL

2nd buffer used to calibrate the offset on the secondary LCD.

For pH 301:

Press pH followed by

CAL DATA

CAL DATA and the meter will display the

last pH calibration data.

2322

Press UP or DOWN to get this information in the following sequence:

°C

a. Date of the last pH

°C

DATE

calibration (month, day and year)

CAL

b. Time when the last

TIME

pH calibration was completed (hour and minutes).

CAL

c.Offset calibration

value expressed in mV and displayed on the primary LCD with the buffer used

CAL

to calibrate the offset on the secondary LCD.

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

-60mV the electrode is no longer reliable. See the electrode maintenance section on page 84.

d. Acid slope calibra-

tion value expressed in mV/pH and displayed on the primary LCD with the

CAL

2nd buffer used to calibrate the offset on the secondary LCD.

e. Alkaline slope calibra-

tion value expressed

in mV/pH and displayed on the primary LCD with the 3 buffer used to cali-

CAL

brate the offset on the secondary LCD.

For pH 302:

See program #3 (page 66).

TAKING REDOX MEASUREMENTS

pH300, pH301 and pH302 have the capabil-

ity 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.

For pH 301:

To get into the mV mode, press mV.

To measure the mV of a solution simply submerge the ORP electrode tip (4 cm/1½") into the sample to be tested. Allow a few minutes for the

reading to stabilize. The display will indicate the absolute mV value

(positive or negative).

For pH 300 and pH 302 only

When values are less

Rel mV

than ±400 mV, tenths of mV are displayed; for values greater than

°C

±400mV, the decimal digit disappears.

4 cm

2524

Note that the change in scale (from 0.1 mV to 1 mV as resolution) is automatic.

For all models:

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

pH300, pH301 and pH302 have the capabil-

ity 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.

For pH 300 and pH 302:

The display will indicate the absolute mV value (positive or negative).

When values are less

Rel mV

than ±400 mV, tenths of mV are displayed; for

°C

values greater than ±400mV, the decimal 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

the ppm value expressed in ppm or mV (depend-

°C

ing on the measured sample). Note that the change in scale (from 0.001ppm to 0.01ppm or

0.1 ppm as resolution) is automatic.

For all models:

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.

For pH 301:

To get into the ION mode, press ION.

Simply submerge the ISE electrode tip (4 cm/1½") into the sample to be tested. Allow a few minutes for the reading to stabilize.

ION

VIEWING THE ION CALIBRATION FACTOR ON THE LCD (for pH 301 only)

Press ION followed

ION

CAL DATA

by CAL DATA and the meter will display the last ION cali- bration data.

°C °C

4 cm

Press UP or DOWN to get this information in the following sequence:

2726

a. Date of the last ION

DATE

calibration (month, day and year)

b. Time when the last

CAL

ION calibration was completed (hour and

TIME

minutes)

c.Offset calibration

value expressed in

CAL

INTV

mV and displayed on the primary LCD

with the value used to calibrate the offset on the secondary LCD.

d. Slope calibration

value expressed in

CAL

ppm

mV/[log (0.0001xppm)] and displayed on the primary LCD with

CAL

ppm

the 2nd value used to calibrate the slope on the secondary LCD.

TAKING TEMPERATURE MEASUREMENTS

Taking a temperature measurement is very easy.

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).

°C

PRINTING FUNCTION (for pH 302 only)

Press PRINT to get a printout at

any time. All the printouts will be complete

with date, time, sample No., temperature and measurement value (pH or mV depending on the selected measurement range).

DATE 1/02 TIME 12:21 SAMPLE 1 °C 17.9 pH 7.18

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.

MEM

°C

2928

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

Pour small quantities of

HI 7004

pH7.01 (HI7007/HI8007) and pH4.01 (HI7004/HI8004) and/

HI 7004

HI 7007

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 between the buffers is mini-

HI 7007

mized. To get accurate readings, use pH 7.01 and

3130

pH 4.01 if you are going to measure acid samples, or pH 7.01 and pH 10.01 for alkaline measurements or, for pH301 only, perform a 3-point calibration for the entire range.

PROCEDURE

RANGE

• Press RANGE (for pH300 and pH 302) to select the pH measurement mode.

• Press pH (for pH301) to select the pH measure-

ment mode.

• Remove the protective cap from the pH electrode.

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

HI 7007

be submerged approximately 4 cm (1½") into the solution. The tempera-

ture probe should be located as close as

4 cm

possible to the pH electrode.

• Press CAL. The primary LCD will display the pH value using the current offset and

slope, with the "CAL" and "

CAL

BUF

" indicators lit.

CAL

BUF

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

ENTER/

°C

CAL

BUF

• Only when the reading is stable (less

" in-

CFM

CFM/

CFM

than ±0.03 variation in a 10 seconds time

interval) the "

BUF

dicator 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

WRONG

BUF

and "WRONG " will blink alternately. If the reading is close to the selected buffer (±1pH), the meter stores the reading

WRONG

BUF

3332

CFM/

(and adjusts the offset point). The buffer value is

then displayed on the primary LCD and the secondary LCD will display the ex-

CAL

BUF

pected second buffer value. For pH 302 only: the printer will print

further instructions for the calibration procedure.

Now dip the electrode in 2nd solution, wait 30 sec and then press CFM

• Press CAL and the calibration process is ended with just the offset of the meter calibrated. For best accuracy however, it is recommended that a two-point calibration is performed.

For pH 300 only

The calibration process is complete and the display will ask for the date

CAL

entry.

°C

Use UP or DOWN to select the month, the day and the year.

Use CAL to toggle between month, day and year.

CAL

°C

DATE

After entering the calibration date, press CFM and the meter will return to the normal operating

mode.

Note: during calibration, the

RANGE

secondary LCD displays 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 pH 1.68 for pH 301 only) if you are going to measure acid samples (pH 7 or less), use pH10.01 (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 pH10.01; for pH301

HI 7004

only, the second buffer can also be pH 1.68 or pH 9.18) and shake briefly.

Note: the electrode should

be submerged approximately 4 cm (1½") into the solu-

4 cm

tion. The temperature probe should be located as close as possible to the pH electrode.

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