Hanna Instruments HI 931402 User Manual

Instruction Manual

HI 931402 HI 931410

Microprocessor

Bench-top

pH Meters

ins

rum

pH calibration procedure

tart calibra

tion

I 9

MEM

°C

COMM

elect buffer1 value

Confirm

hen ready

elect buffer2 value

onfirm

hen ready

OFF

Function

For storing display result

ecall previous stored

data

or R

232 configuration

Select pH

r O

P m

easurem

This Instrument is in Compliance with the CE Directives

www.hannainst.com

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 (EN 50081-1 and EN 50082-1) directives.

TABLE OF CONTENTS

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

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

Functional Description LCD ...................... 3

Functional Description HI 931402 ............. 4

Specifications HI 931402 .......................... 5

Functional Description HI 931410 ............. 6

Specifications HI 931410 .......................... 7

Operational Guide ..................................... 8

pH Calibration ......................................... 15

pH Values at Various Temperature .......... 26

Temperature and mv Calibration............. 27

Interface with PC (HI 931402 only) ......... 28

Additional Calibration Procedures &

Information for HI 931402 only ................ 29

Troubleshooting for HI 931402 ................ 33

Troubleshooting for HI 931410 ................ 34

Electrode Conditioning and Maintenance .. 35 Temperature-Resistance Correlation

for Hanna pH Sensitive Glass ................. 39

Accessories ............................................. 41

Electrode Application Reference Guide .. 50

Warranty.................................................. 51

CE Declaration of Conformity ................. 53

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.

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 HI 931402 and HI 931410 are bench pH meters for pH, ORP (Oxidation Reduction Potential), ISE (Ion Selective Electrode) and temperature measurements.

Their built-in microprocessor ensures accurate and user-friendly operation.

pH measurements are manually or automatically compensated for the temperature effect (MTC/ATC).

They feature: large liquid crystal display (LCD), user-friendly keyboard, error codes to guide the user in calibration and troubleshooting and storage of calibration data even after the unit is shut off.

HI 931402 will not allow calibration until the electrode has stabilized to ensure accurate pH measurements.

These models meet the most stringent demands of the laboratory: they both automatically recognize five standard calibration buffers (pH 4.01, 6.86, 7.01, 9.18, 10.01).

In HI 931410 a recorder output of 0 to 2 volts is available and the wide mV range and high resolution allow for ORP or ion-selective measurement.

In HI 931402, through the RS 232C serial port you can transfer sample measurements to a PC.

HI 931402 comes supplied with HI 1131B glassbody combination pH electrode, HI 7669/2W temperature probe (with 1 meter / 3.3' cable), HI 76405 electrode holder, pH 4.01 and pH 7.01 buffer solutions (30 ml each), HI 7071 reference electrolyte (30 ml), 12VDC adapter (HI 710005 or HI 710006) and a dust cover.

HI 931410 comes supplied with HI 1131B glassbody combination pH electrode, HI 7669/2W temperature probe (with 1 meter / 3.3' cable), 12VDC adapter (HI 710005 or HI 710006) and a dust cover.

FUNCTIONAL DESCRIPTION LCD

Primary Display

HI 931402

MEM

CAL

NOT READY

CON WRONG LOW BAT

BUF

°C1

Secondary Display

HI 931410

°C

Temperature Display pH/mV Display

FUNCTIONAL DESCRIPTION HI 931402

ins rum n

MEM

CAL

NOT READY CFM WRONG

BUF

°C1

CAL Start calibration

/ Select buffer1 value

CFM Confirm when ready

/ Select buffer2 value

CFM Confirm when ready

HI 931402 MICROPROCESSOR pH METER

CAL

COMM

RANGE

CFM

pH calibration procedure

°CMEM

°C

Function

MEM For storing display result

MR Recall previous stored data

COMM For RS232 configuration

RANGE Select pH or ORP measurement

OFF

2345 678

1. Liquid Crystal Display

2. MEM key to store a value in memory

3. MR key to recall the stored value

4. CAL key to enter and exit the calibration mode

5. CFM key to confirm calibration values

6. RANGE key to select the measurement range

7. COMM key to set the baud rate

↑↑

↑°C and

↑↑

↓↓

↓°C keys to manually set tempera-

↓↓

ture and to select pH buffer values

9. ON to turn the meter on

10. OFF key to turn the meter off

DTR

TXD

GND

COMBINATION

REFERENCE

ELECTRODE

TEMPERATURE

PROBE

RESET

23 4 5 6 7

RXD

ooooo oooo

RS-232

ooooo

oooo

DSR

1. BNC Connector

2. Reference Electrode Connector (Ø 0.08")

3. Reference Electrode Connector (Ø 4 mm)

4. Temperature Probe Connector

5. Reset Button

6. RS 232C Connector

7. DC Power Socket (for HI 710005 or HI 710006)

SPECIFICATIONS HI 931402

Range pH 0.00 to 14.00

ISE ±399.9 mV

ORP ±1999 mV

°C 0.0 to 100.0

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 ±0.02 Deviation ISE ±0.5 mV

ORP ±1 mV

°C ±2

pH Calibration Automatic 1 or 2 points with

5 memorized buffers

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

Temperature Automatic or manual Compensation from 0 to 100°C (32 to 212°F)

Electrode HI1131B glass body combination

refillable pH electrode (included)

Temperature HI 7669/2W (included) probe

Input impedance 10

Ω

Computer RS 232C (optoisolated) Interface

Power supply 12 VDC (CSA, UL & CE approved)

Environment 0 to 50°C (32 to 122°F); 95% RH

Dimensions 230x170x70 mm (9.1x6.7x2.7")

Shipping Weight 1.3 kg (2.9 lb.);

kit with holder: 3.2 kg (7 lb.)

FUNCTIONAL DESCRIPTION HI 931410

°C

HI 931410

T Buffer Values (pH)

°C 4.01 7.01 10.01

0 4.01 7.13 10.32 10 4.00 7.07 10.18 20 4.00 7.03 10.06

OFF

30 4.02 7.00 9.96

40 4.04 6.98 9.88

°C

CAL

CON

pH mV

°C

1. ON and OFF keys to turn the instrument on and off. (Warning: Push OFF before unplugging instrument. If unplugged before turned off, the meter's memories will be erased)

2. CAL key to enter the calibration mode

3. CON key to confirm the calibration data

4.°C and °C keys to set temperature during manual compensation adjustment

5. pH/mV key to select the mV (mV, ORP or ISE measurements) or the pH range

6. Liquid Crystal Displays

TEMPERATURE

DC POWER 12V to 20V

COMBINED pH or ORP

ELECTRODES

REFERENCE ELECTRODE

RESET

RECORDER

0-2 VOLT

PROBE

1. BNC Connector

2. Reference Electrode Connector

3. RESET button

4. Recorder Output Connector

5. Temperature Probe Connector

6. DC Power Socket (for HI 710005 or HI 710006)

SPECIFICATIONS HI 931410

Range pH

ISE

ORP

°C

Resolution pH

ISE

ORP

°C

Accuracy pH

(@ 20°C / 68°F) ISE

ORP

°C

Typical EMC pH DeviationISE/ORP

°C

Recorder pH Output m V

Max. Current

Offset

Slope

Calibration

Temperature Compensation

Electrode

Temp. Probe

Input Impedance

Power

Environment

Dimensions

Shipping Weight

0.00 to 14.00

0.0 to ±399.9mV ±1999mV

-10.0° to 125.0

0.01

0.1mV

0.1/1mV

0.1

±0.01

±0.2 mV

±1 mV

±0.5

±0.01

±0.2mV

±0.7

0 to 2 V 0 to 2 V

20mA

±1 pH

from 85% to 105%

Automatic 1 or 2 points with

3 memorized buffers

(pH 4.01, 7.01, 10.01)

Manual from 0 to 100°C (32 to 122°F)

Automatic from -10 to 125°C (14 to 257°F)

HI 1131B glass body combination

refillable pH electrode (included)

HI 7669/2W (included)

Ω

12VDC (CSA, UL & CE approved)

0 to 50°C (32 to 122°F); 95% RH

230x170x70 mm (9.1x6.7x2.7")

1.5 Kg (3.3 lb.)

OPERATIONAL GUIDE

ELECTRODE AND PROBE CONNECTIONS

For combination pH or ORP electrodes (with internal reference) plug the electrode's BNC to the socket provided (see pages 4 and 6, #1).

For electrode with separate reference, connect the measuring electrode's BNC to the BNC socket (see pages 4 and 6, #1) and the reference electrode's plug to the socket provided (see page 4, #2 or #3 for HI 931402, or page 6, #2 for HI 931410).

For temperature measurements and automatic temperature compensation connect the temperature probe to the °C socket (see page 4, #4 for HI 931402, or page 6, #5 for HI 931410).

POWER CONNECTION

Plug the 12VDC adapter (HI 710005 or HI 710006) into the DC socket (see page 4,

#7 for HI 931402, or page 6, #6 for HI 931410). Plug the adapter to the mains.

Note: Make sure the main line is protected

by a fuse.

HI931402 uses an EEPROM and HI 931410 uses a rechargeable battery 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. In HI 931410 the battery lasts approximately one month when fully charged, and it is automatically charged any time the meter is plugged-in (either turned on or off).

pH MEASUREMENTS

To take a pH measurement simply submerge the tip (4 cm/1½") of the electrode

(1½ ")

and the temperature probe into the sample to be tested.

Turn the instrument on by pressing the ON key.

The meter automatically defaults to the pH measurement mode.

Allow 1 or 2 minutes for the electrode to stabilize.

In HI 931402 pH is displayed on the primary display and temperature on the secondary one, whereas in HI 931410 pH is displayed on the left LCD.

°C

4 cm

In order to take accurate pH measurements, make sure that the instrument has been calibrated for pH before use (see page 15).

In HI 931402, if the calibration data is lost or the meter is not calibrated, the "CAL" indicator is displayed to

CAL

prompt the user to perform a calibration. If the user chooses not to do it and presses the CAL key to quit from the calibration mode, the offset and

CAL

slope of the instrument are set to 0 mV and 100% of the theoretical value respectively.

°C

If measurements are taken in different samples successively, it is recommended that the electrode and the temperature probe are rinsed thoroughly for better conditioning, and then blot dry between each measurements. For this rinsing process, it is recommended to use a liberal amount of the sample to be measured.

Using refillable electrodes

Unscrew the small refill cap to open the refill hole during measurements. After measurement replace the refill hole cap.

The pH reading is directly affected by temperature. In order for the meter to measure the pH accurately, temperature must be taken in 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 as close to the electrode as possible and wait for 1-2 minutes.

MANUAL TEMPERATURE COMPENSATION

If you know the temperature of the sample to be tested you can manually compensate for it.

If manual temperature compensation is desired the temperature probe must be disconnected from the instrument.

The display will then show the default temperature (25°C in HI 931402 or 20°C in HI 931410) or the last recorded temperature reading (HI 931402 only). "°C" is blinking.

Note the temperature of the sample using a ChecktempC or a glass thermometer.

°C

ºC

°C

ºC

Use the UP or DOWN arrow keys to manually adjust the display reading to the value of the reference thermometer.

°C

If the temperature probe is connected to the meter, the secondary or the temperature LCD figure display the measured temperature reading and the "°C" indicator does not blink.

Pressing the ↑°C or ↓°C keys will not alter

the temperature reading.

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 measurements.

ORP MEASUREMENTS

HI 931402 and HI 931410 have the capability to take ORP measurements, using an optional ORP electrode. Hanna Instruments offers a variety of ORP electrodes for this purpose (see page 47). Contact your Dealer for more information.

Just as pH measurements allow the acidity or the alkalinity of a substance to be expressed in numbers, oxidation-reduction potential (redox) measurements provide the quantification of the

°C

oxidizing or reducing power of the sample tested.

To correctly perform an ORP 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 glass/ platinum junction.

To get into the "mV" mode (ORP or ISE measurements) turn the instrument ON and

pHpH mVmV

RANGE

press the RANGE (HI 931402) or the pH/mV (HI 931410) key.

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

(1½ ")

minutes for the readings to stabilize.

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

4 cm

ºC

When values are less than ±400 mV, tenths of mV are displayed; for values greater than ±400 mV, the decimal digit disappears. Note that the change in scale (from 01. mV to 1 mV as resolution) is automatic.

"---" for HI 931402 or "Err2" for HI 931410 appear if the value exceeds ±1999 mV (out of range).

Note: ORP measurements are taken without

temperature compensation.

°C

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 HI 7669/2W into the sample and allow the reading on the secondary display to stabilize (1 or 2 minutes).

The temperature value will be displayed on the secondary LCD for HI 931402 and on the left LCD for HI 931410.

°C

HOLD FUNCTION (for HI 931402 only)

To hold and memorize the measured value, press the

MEM

MEM key.

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.

To recall the stored memory value, press the MR key button and the memorized reading will be displayed with the MEM indicator lit.

MEM

°C

RESET BUTTON

The RESET button (see page 4, #5 for HI 931402, or page 6, #3 for HI 931410) 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.

RECORDER OUTPUT (for HI 931410 only)

HI 931410 is provided with a recorder output from 0 to 2 volts. Connect the recorder output (see page 6, #4) and select the pH or mV range by pressing the pH/mV key. The output signal is related to the values as follows:

pH output:

0.01 pH = 1.42857 mV

e.g. 0.00 pH = 0 mV

7.00 pH = 1000 mV

14.00 pH = 2000 mV

mV output:

0.1 mV = 0.05 mV

e.g. -1999 mV = 0 mV

0.0 mV = 1000 mV

+1999 mV = 2000 mV

The output impedance is 100 ohms. The maximum output short-circuit current is 20 mA.

AFTER MEASUREMENTS

Press the OFF key to switch the instrument off.

OFF

pH CALIBRATION

It is recommended to calibrate the instrument frequently, especially if high accuracy is required.

The instrument should be re-calibrated for pH:

• Whenever the pH electrode or temperature probe is replaced.

• At least once a month.

• After testing aggressive chemicals.

• After cleaning procedure and changing the reference electrolyte.

• If greatest accuracy is required.

PREPARATION

Pour small quantities of the buffer solutions into clean beakers. If possible use plastic beakers to minimize any EMC interferences

HI 7004

HI 7007

To get accurate readings, use pH 7.01 and pH 4.01 if you are going to measure acid samples or pH 7.01 and pH 10.01 for alkaline measurements.

For accurate calibration use two beakers for each buffer solution, the first one for rinsing the electrode, the second one for calibration. In this way contamination of the buffers is minimized.

RINSE

HI 7007

CALIBRATION

HI 7007

+ 38 hidden pages