Hanna Instruments HI 2221 Manuale utente

Instruction Manual

HI2221 - HI2223

pH/mV/ºC

Bench Meters

with Calibration Check

www.hannainst.com

Dear Customer,

Thank you for choosing a Hanna Instruments product.

Please read this instruction manual carefully before using these

instruments.

This manual will provide you with the necessary information for correct

use of these instruments, as well as a precise idea of their versatility.

If you need additional technical information, do not hesitate to e‑mail

us at [email protected] or view our worldwide contact list at

www.hannainst.com.

All rights are reserved. Reproduction in whole or in part is prohibited

without the written consent of the copyright owner.

PRELIMINARY EXAMINATION ..........................................................4

GENERAL DESCRIPTION..................................................................4

FUNCTIONAL DESCRIPTION.............................................................5

HI2221 SPECIFICATIONS ...............................................................6

HI2223 SPECIFICATIONS ...............................................................7

OPERATIONAL GUIDE.....................................................................8

pH CALIBRATION .........................................................................10

ENHANCED CALIBRATION MESSAGES ............................................14

ELECTRODE CONDITION AND ELECTRODE RESPONSE TIME ..............16

pH BUFFER TEMPERATURE DEPENDENCE ......................................17

GOOD LABORATORY PRACTICE (GLP)..............................................18

LOGGING.....................................................................................21

SETUP........................................................................................24

TEMPERATURE CALIBRATION (for technical personnel only) .............27

mV CALIBRATION (for technical personnel only)..............................29

PC INTERFACE .............................................................................30

ELECTRODE CONDITIONING AND MAINTENANCE.............................34

TROUBLESHOOTING GUIDE ..........................................................37

TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS.................38

ACCESSORIES..............................................................................39

TABLE OF CONTENTS

Remove the instrument from the packing material and examine it carefully

to make sure that no damage has occurred during shipping. If there is any

damage, please contact your local Hanna Instruments Office.

Each instrument is supplied complete with:

• HI1131P Glass‑body Combination pH Electrode with 1 m

(3.3“) cable

• HI7662 Temperature Probe

• HI76404N Electrode Holder

• pH4.01 & 7.01 Buffer Solutions (20 mL each)

• HI7082 Electrolyte Solution

• HI700661 Cleaning Solutions (20 mL each)

• 12 VDC Power Adapter

• Instruction Manual

• Quality Certificate

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.

HI2221 and HI2223 are logging microprocessor‑based pH/ORP/

temperature bench meters with Calibration Check.

Calibration Check performs a set of diagnostic tests during calibration

using the history of electrode slope and offset to detect problems that

can cause loss of accuracy.

Calibration Check Features are:

• Enhanced Calibration Messages

During calibration the user is warned if one or more parameters

are not suitable to perform an accurate calibration.

• Electrode Condition on LCD Display

Determined from the electrode offset and slope.

• Electrode response time on LCD Display

Determined from electrode performance during calibration.

Other features include: up to five pH point calibration with seven mem‑

orized buffers (1.68, 4.01, 6.86, 7.01, 9.18, 10.01 and 12.45 pH),

logging up to 100 samples (for HI2221) and 500 samples (for HI2223),

GLP, calibration due alarm, pH reading with manual or automatic

temperature compensation and PC software interface.

PRELIMINARY EXAMINATION

GENERAL DESCRIPTION

FUNCTIONAL DESCRIPTION

Front Panel

Rear Panel

1) Liquid Crystal Display (LCD).

2) CAL key, to enter and exit calibration mode.

3) CFM/GLP key, to confirm calibration, different values or to display

Good Laboratory Practice information.

4) °C key, to manually increase temperature value or other

parameters.

5) °C key, to manually decrease temperature value or other

parameters.

6) SETUP key, to enter/exit SETUP mode.

7) RANGE key, to select measurement range, switch to focused data

in SETUP or to toggle between buffer value and temperature during

calibration.

8) LOG/CLR key, to store a value into memory, to clear pH calibration,

or to delete log records.

9) RCL key, memory recall.

10)ON/OFF switch.

11)Power supply socket.

12)USB connector.

13)BNC electrode connector.

14)Temperature probe socket.

15)Electrode reference socket.

HI2221 SPECIFICATIONS

Range

–2.00 to 16.00 pH

±699.9 mV

±2000 mV

–20.0 to 120.0 °C (‑4.0 to 248.0 °F)

Resolution

0.01 pH

0.1 mV (±699.9 mV)

1 mV (±2000 mV)

0.1 °C

Accuracy

@ 20 °C/68 °F

±0.01 pH

±0.2 mV (±699.9 mV)

±1 mV (±2000 mV)

±0.2 °C (excluding probe error)

Calibration Check Yes

Computer Interface Opto‑isolated USB

pH Calibration Automatic up to 5 points, 7 buffers available

(1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45)

Logging 100 points

Temperature

Compensation

Manual or Automatic from:

–20.0 to 120.0 °C (–4.0 to 248.0 °F)

pH Electrode HI1131P glass body, double junction refillable

cell, BNC + pin (included)

Temperature Probe HI7662 stainless steel probe (included)

Input Impedance 1012 ohm

Power Supply 12 VDC adapter (included)

Environment 0 – 50 °C (32 ‑– 122 °F)

max RH 95 % non condensing

Dimensions 235 x 222 x 109 mm (9.2 x 8.7 x 4.3”)

Weight 1.3 Kg (2.9 lb);

kit with holder 2.1 Kg (4.6 lb)

Warranty 2 years

HI2223 SPECIFICATIONS

Range

–2.00 to 16.00 pH

–2.000 to 16.000 pH

±999.9 mV

±2000 mV

–20.0 to 120.0 °C (‑4.0 to 248.0 °F)

Resolution

0.01 pH

0.001 pH

0.1 mV (±999.9 mV)

1 mV (±2000 mV)

0.1 °C

Accuracy

@ 20 °C/68 °F

±0.01 pH

±0.002 pH

±0.2 mV (±999.9 mV)

±1 mV (±2000 mV)

±0.2 °C (excluding probe error)

Calibration Check Yes

Computer Interface Opto‑Isolated USB

pH Calibration Automatic up to 5 points, 7 buffers available

(1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45)

Logging 500 points

Temperature

Compensation

Manual or Automatic from:

–20.0 to 120.0 °C (–4.0 to 248.0 °F)

pH Electrode HI1131P glass body, double junction refillable

cell, BNC + pin (included)

Temperature Probe HI7662 stainless steel probe (included)

Input Impedance 1012 ohm

Power Supply 12 VDC adapter (included)

Environment 0 – 50 °C (32 – 122 °F)

max RH 95 % non condensing

Dimensions 235 x 222 x 109 mm (9.2 x 8.7 x 4.3”)

Weight 1.3 Kg (2.9 lb);

kit with holder 2.1 Kg (4.6 lb)

Warranty 2 years

OPERATIONAL GUIDE

POWER CONNECTION

Plug the 12 VDC adapter into the power supply socket.

Notes:• These instruments use non volatile memory to retain

the pH, mV, temperature calibrations and all other settings, even

when unplugged.

• Make sure a fuse protects the mains line.

ELECTRODE AND PROBE CONNECTIONS

For Hanna Instruments P Type pH or ORP electrodes (with internal

reference) connect the electrode’s BNC to the socket on the back of the

instrument and the pin to the reference socket.

Note: Electrode condition and response information is displayed on

the bar graph gauges during the day the calibration is performed,

only if Hanna Instruments P type (PIN) electrodes are used.

If the electrode is not recognized as a Hanna Instruments P type

electrode, the bar graph gauges will blink (25 seconds OFF,

4 seconds ON, full bar graph).

For temperature measurement and automatic temperature compensation

connect the temperature probe to the appropriate socket.

INSTRUMENT START-UP

• Turn the instrument on by pressing the ON/OFF switch located on

the rear panel.

• All LCD tags are displayed and a beep is sounded while the instrument

performs a self test.

• The instrument will display “LoAD” message and “ ” blinking until

initialization is complete.

• The “Unscrew electrode refilling cap” message reminds the user to

loosen or remove the electrode refilling cap to improve the electrode’s

response time.

• The instrument automatically defaults to pH measurement mode

unless a Hanna Instruments P type ORP electrode is detected.

pH MEASUREMENT

Make sure the instrument has been calibrated before

taking pH measurements.

• Submerse the tip of a properly conditioned

electrode (see page 34) and the temperature

RANGE

probe approximately 3 cm (1¼”) into the sample to be tested and stir

gently. Allow time for the electrode to stabilize.

• The pH is displayed on the primary LCD and the temperature on the

secondary LCD.

• The pH reading is out of range, the closest full‑scale value will be

displayed blinking on the primary LCD.

If measurements are taken successively in different samples, it is recom‑

mended to rinse the electrode thoroughly with deionized water or tap wa‑

ter and then with some of the next sample to prevent cross‑contamination.

The pH reading is affected by temperature. In order to measure the pH

accurately, this temperature effect must be compensated for. To use the

Automatic Temperature Compensation feature, connect and submerse

the HI7662 temperature probe into the sample as close

to the electrode as possible and wait for a few minutes.

If the temperature of the sample is known, manual

compensation can be performed by disconnecting the

temperature probe.

The display will show the last recorded temperature

reading with the “°C” symbol blinking.

The temperature can now be adjusted with the ARROW keys (from

‑20.0 ºC to 120.0 ºC).

ORP MEASUREMENTS

An optional ORP electrode must be used to perform ORP measurements

(see Accessories).

Oxidation‑Reduction Potential (REDOX) measurements provide the

quantification of the oxidizing or reducing power of the tested sample.

The surface of the ORP electrode must be clean and smooth in order to

obtain an accurate measurement.

Calibrate the instrument frequently, especially if high accuracy is required.

For best results and constant display of electrode condition and electrode

response on the bar graph gauges, daily calibration is recommended.

The instrument should be recalibrated:

• Whenever the pH electrode is replaced.

• At least once a day.

• After testing aggressive chemicals.

• If high accuracy is required.

• If “CAL DUE” message is displayed during measurement.

Every time you calibrate the instrument use fresh buffers and perform an

electrode cleaning procedure (see page 36).

PREPARATION

Pour small quantities of the buffer solutions into clean beakers. If possible,

use plastic or glass beakers to minimize any EMC interferences.

For accurate calibration and to minimize cross‑contamination, use two

beakers for each buffer solution. One for rinsing the electrode and one

for calibration.

pH CALIBRATION

Pretreatment solutions are available to condition the

electrode and speed up the response time.

• The instrument automatically defaults to the

mV measurement mode if Hanna Instruments

P type ORP electrode is detected.

• Submerse the ORP electrode tip (3 cm (1¼”) into the sample. Allow

a few minutes for the reading to stabilize.

• The instrument displays the mV reading on the primary LCD.

• If the reading is out of range, the closest full‑scale value will be

displayed blinking on the primary LCD.

TAKING TEMPERATURE MEASUREMENTS

Connect the HI7662 temperature probe and turn the

instrument on. Dip the temperature probe into the sample

and allow the reading on the secondary LCD to stabilize.

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