Hanna Instruments HI 207 User Manual

Instruction Manual

10 11

HI 208 HI 207

Educational pH / Temperature

Bench Meters

with Built-in Stirrer

w w w.hannainst.com

WARRANTY

All Hanna Instruments meters are warranted for two years against defects in workmanship

and materials when used for their intended purpose and maintained according to instructions. The

probe is warranted for a period of six months.

This warranty is limited to repair or replacement free of charge. Damage due to accidents, misuse, tampering or lack of prescribed maintenance are not covered.

If service is required, contact the dealer from whom you purchased the instrument. If under warranty, report the model number, date of purchase, serial number and the nature of the problem. If the repair is not covered by the warranty, you will be notified of the charges incurred. If the instrument is to be returned to Hanna Instruments, first obtain a Returned Goods Authorization Number from the Customer Service department and then send it with shipment costs prepaid. When shipping any instrument, make sure it is properly packaged for complete protection.

All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of the copyright owner.

Dear Customer, Thank you for choosing a Hanna Instruments

Product. Please read this instruction manual carefully

before using the instrument. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst.com.

These instruments are in compliance with the

directives.

PRELIMINARY EXAMINATION

Remove the instrument from the packing material and examine it carefully to make sure that no damage has occurred during shipment. If noticeable damage is evident, notify your dealer.

Each instrument is supplied with:

• HI 1291D pH/Temperature probe with DIN

connector and 0.5 m (1.6’) cable

• pH 4.01 & 7.01 buffer solutions (20 mL each)

• Plastic beaker

• Electrode holder

• Rubber O-ring

• Magnetic stir bar (HI 208 only)

• 12Vdc power adapter

• Instruction manual

Note: Save all packing material until you

are sure that the instrument functions correctly. All defective items must be returned in the original packing together with the supplied accessories.

GENERAL DESCRIPTION

HI 207 and HI 208 are microprocessor-based

pH and temperature bench meters. Main features include: extended pH and tem-

perature ranges; built-in magnetic stirrer (HI 208 only); large dual-line display; automatic pH calibration at one or two points, with two memorized buffer sets (standard or NIST); selectable temperature unit (°C or °F).

The pH electrode has a built-in temperature sensor for simultaneous pH and temperature readings, and also contains a mini amplifier to render measurements impervious to noise and electrical interferences.

FUNCTIONAL DESCRIPTION

Front Panel

HOLD

ON/OFF

SET

MODE

2 3 5 64

HI 208

pH meter

STIR

ON/OFF

1- Liquid Crystal Display (LCD). 2 - ON/OFF/MODE key, to turn the instrument

ON or OFF, to quit calibration/freezing mode or to set parameters in SETUP.

3- HOLD/SET key, to freeze the display, to select

the temperature unit or the calibration buffer

set, or to reset to the default calibration. 4 - Stirrer status LED indicator (HI 208 only). 5- STIR ON/OFF key (HI 208 only), to start/

stop the stirrer. 6- Electrode holder.

Rear Panel

7- Plastic beaker. 8- Beaker holder. 9 - Magnetic stir bar (HI 208 only). 10 - DIN connector for probe. 11 - Socket for power adapter.

LCD DESCRIPTION

121

3 4 5

1. Automatic Temperature Compensation indicator

2. Stability indicator

3. Battery percentage

4. pH calibration indicator

5. Battery indicator

6. Selectable temperature unit

7. Secondary display

8. Primary display

9. pH measurement unit

SPECIFICATIONS

Range (*) -2.00 to 16.00 pH

-5.0 to 105.0 °C / 23.0 to 221.0 °F

Resolution 0.01 pH

0.1 °C / 0.1 °F

Accuracy ±0.02 pH

(@20°C/68°F) ±0.5 °C up to 60 °C; ±1 °C outside

±1 °F up to 140 °F; ±2 °F outside

Typical EMC ±0.02 pH Deviation ±0.2 °C or ±0.4 °F

Temperature Automatic Compensation

pH Calibration Automatic, 1 or 2 point

with 2 sets of standardized buffers

(pH 4.01/7.01/10.01 or 4.01/6.86/9.18)

Probe (included) HI 1291D

amplified pH/Temperature probe

with DIN connector and 0.5 m (1.6’) cable

Stirrer (HI 208 only) Built-in magnetic stirrer

at 500 rpm

Power supply 12 Vdc adapter

or 9V alkaline battery

Battery life Approx. 200 hours

without stirrer

Environment 0 to 50 °C (32 to 122 °F);

max RH 95%

Dimensions 192 x 104 x 134 mm (7.6 x 4.1 x 5.3”) Weight 420 g (14.8 oz.)

(*) The temperature range is limited to 80 °C (176 °F)

if using the HI 1291D probe.

Hanna Instruments reserves the right to modify the design, construction and appearance of its

products without advance notice.

IST208 05/05

OPERATIONAL GUIDE pH MEASUREMENT & CALIBRATION

To connect the probe

With the instrument OFF, connect the HI 1291D probe to the DIN connector on the rear panel of the instrument by aligning the pins and pushing it in the plug. Tighten the nut to ensure a good connection. Remove the protective cap from the probe before taking any measurements.

To turn the meter ON

Plug the 12 Vdc adapter into the appropriate socket or use a 9V alkaline battery to power on the instrument.

Press the ON/OFF/MODE key until the display lights up. At start up, all the LCD segments are displayed for one second, then the percentage of the remaining battery life is shown for another second (e.g. % 98 BATT). The instrument then enters normal measurement mode.

Note: If the display needs to be checked, keep

the ON key pressed while turning the meter on. The meter will display all segments as long as the key is pressed.

Note: If using a battery and its percentage is

under 15%, the stirrer will not work.

To freeze the display

While in measurement mode, press the HOLD/ SET key. The "HOLD" message will appear on the secondary display and the reading will be frozen on the LCD (e.g. pH 5.73 HOLD). Press any key to return to normal measurement mode.

To turn the meter OFF

While in normal measurement mode, press the ON/OFF/MODE key . The "OFF" message will appear on the secondary display. Release the key.

Note: The instrument is provided with an

acoustic signal feature, which is heard every time a key is pressed.

Note: When the instrument detects the absence

of the probe, the "ATC" t ag turns off and the secondary display shows a default temperature value of 25 °C (77 °F) blinking. When the probe is connected, the instrument automatically returns to the Automatic Temperature Compensation mode, the "ATC" t ag turns on, and the measured temperature is shown on the secondary display.

• Make sure the instrument has been calibrated before use.

• If the probe is dry, soak it in HI 70300 storage solution for one hour to reactivate it.

• Make sure that the stirrer LED is off or press the STIR ON/OFF key to stop the stirrer (HI 208 only).

• Place the beaker with the solution to be tested into the beaker holder and attach the electrode holder.

• Insert the probe in the electrode holder and use the supplied rubber O-ring for probe in order to immerse the probe tip approximately 4 cm (1½") into the sample to be measured.

• Press STIR ON/OFF to start the stir rer (HI 208 only) and wait until the stability indicator turns off. While the stirrer is on, the stirrer LED also is on.

• The LCD shows the pH value automatically compensated for temperature variations and the temperature of the solution.

• If measurements are taken in different samples successively, rinse the probe tip thoroughly to eliminate cross-contamination. After cleaning, rinse the probe tip with some of the sample to be measured.

pH calibration

For better accuracy, frequent calibration of the instrument is recommended. In addition, the instrument must be recalibrated whenever:

a) The pH electrode is replaced. b) After testing aggressive chemicals. c) Where high accuracy is required. d) At least once a week.

• From normal mode press and hold the ON/OFF/ MODE key until "OFF" message on the secondary display is replaced by "CAL". Release the key .

• The LCD enters the calibration mode, displaying "pH 7.01 USE" (or "pH 6.86 USE" if the NIST buffer set was selected) and "CAL" tag blinking. After 1 second the instrument activates the automatic buffer recognition feature. If a valid buffer is detected, then its value is shown on the primary display, and "REC" message appears on the secondary display. If no valid buffer is detected, the instrument keeps the "USE" message active for 12 seconds, and then replaces it with "WRNG", to indicate an invalid buffer.

• For a single-point calibration with pH 4.01, 9.18 or 10.01 buffer, the meter automatically accepts the calibration when the reading is stable; the meter will show the accepted buffer , with the "OK 1" message, and an audible signal is produced. After 1 second the meter automatically returns to normal measurement mode. If a single-point calibration with pH 7.01 or 6.86 buffer is desired, then after the calibration point has been accepted, the ON/OFF/MODE key must be pressed in order to return to normal measurement mode. After the key is pressed, the instrument shows "7.01" (or "6.86") - "OK 1", and an audible signal is produced. After 1 second, the instrument automatically returns to normal measurement mode.

Note: For better accuracy it is always recom-

mended to carry out a two-point calibration.

• For a

two-point calibration, place the probe in pH 7.01 (or pH 6.86) buffer . After the calibration point has been accepted, the pH 4.01 "USE" message appears. The message is held for 12 seconds, unless a valid buffer is recognized. If no valid buffer is recognized, then the "WRNG" message is displayed. If a valid buffer (pH 4.01, pH 10.01 or pH 9.18) is detected, then the instrument completes the calibration procedure. When the buffer is accepted, the LCD shows its value with the "OK 2" message. The instrument then returns to normal measurement mode.

Note: When the calibration procedure is completed,

the "CAL" tag turns on.

To quit calibration and to reset to the default values

• After entering the calibration mode and before the first point is accepted, it is possible to quit the procedure and return to the last calibration data by pressing the ON/OFF/MODE key . The secondary display shows "ESC" message for 1 second and the instrument returns to normal mode.

• To reset to the default values and clear a previous calibration, press the HOLD/SET key after entering calibration mode and before the first point is accepted. The secondary display shows "CLR" message for 1 second, the instrument resets to the default calibration and the "CAL" tag turns off.

INSTRUMENT SETUP

The SETUP mode allows the selection of the temperature unit and the pH buffer set. T o enter SETUP mode, press and hold the ON/ OFF/MODE key until "CAL" message on the secondary display is replaced by "TEMP" and the current temperature unit (e.g. TEMP °C). Then:

for °C/°F selection, use the HOLD/SET key . After

• the temperature unit has been selected, press the ON/OFF/MODE key to enter the buffer set selection mode; press ON/OFF/MODE twice to return to normal measurement mode.

to change the calibration buffer set, after setting

• the temperature unit, the instrument will show the current buffer set: "pH 7.01 BUFF" (for 4.01/7.01/

10.01) or "pH 6.86 BUFF" (for 4.01/6.86/9.18). Change the set with the HOLD/SET key , then press ON/OFF/MODE to return to normal mode.

BATTERY REPLACEMENT

Battery replacement must only take place in a non-hazardous area and using the battery type specified in this instruction manual.

Simply rotate the battery cover from the bottom of the instrument as shown in the figure, and replace the battery while paying attention to the correct polarity. Replace the cover .

ACCESSORIES

HI 1291D pH/Temperature probe with DIN HI 7004 pH 4.01 buffer solution, 500 mL

HI 7006 pH 6.86 buffer solution, 500 mL HI 7007 pH 7.01 buffer solution, 500 mL HI 7009 pH 9.18 buffer solution, 500 mL HI 7010 pH 10.01 buffer solution, 500 mL HI 70300L Storage solution, 500 mL HI 7061L Cleaning solution, 500 mL

connector and 0.5 m (1.6’) cable