IQ IQ150 Bedienungsanleitung

MODEL IQ150 pH Meter

Getting Started

TWO-POINT CALIBRATION--QUICK REFERENCE GUIDE

2. 3. 4.

Connect probe to

meter. Put probe in first

calibrating buffer. Press ON/OFF to

turn on meter. If necessary, press

pH until pHicon is

seen on the display.

5. 6. 7. 8.

Press CAL. If necessary, press

SELECT BUFFER

until display matches

first buffer value.

Press ENTER and

wait until the large

number display

stops flashing.

When complete,

meter will display

the next stored

buffer value. 2PT

will be displayed.

9. 10. 11. 12.

Rinse probe in

deionized water

and place in

second calibrating

buffer.

If necessary, press

SELECT BUFFER

until display matches

second buffer value.

Press ENTER and

wait until the large

number display

stops flashing.

Rinse probe in

deionized water and

place in sample.

INTRODUCTION

IMPORTANT NOTICE

IF THE METER IS USED IN A MANNER OTHER THAN AS

DESCRIBED, THE SAFETY AND PERFORMANCE OF THE METER

CAN BE IMPAIRED.

IF THE SEAL ON THE BACK OF THE METER IS TAMPERED

WITH, THE WARRANTY IS IMMEDIATELY VOIDED.

The IQ150 pH “Dual Technology” meter accepts both traditional style glass

sensor electrodes with BNC connectors as well as non-glass pH probes with

ISFET (Ion Sensitive Field Effect Transistor) silicon chip sensors.

Throughout this manual, non-glass pH probes with silicon chip sensors will be

referred to as “ISFET” probes. The meter has a standard BNC connector for

attachment of glass sensor pH electrodes. Glass sensor pH electrodes will be

referred to as “BNC” probes.

The meter is designed to use only one electrode at a time. The meter

automatically identifies which type of electrode is attached when the meter is

turned on. If both ISFET and BNC probes are attached at the same time,

errors may occur. Always turn off the meter when changing electrodes

ESTIMATED LIFE OF AN ISFET SENSOR pH PROBE

Depending upon the application, the expected life of an ISFET probe is

approximately 18 months. The reference electrode contains a KCl gel, which

becomes increasingly diluted with usage and time. The reference is sealed

and is not refillable. When it becomes difficult to calibrate (pH buffer value

does not stop flashing during calibration or takes an excessively long time to

stop flashing), the probe should be replaced. A probe that is dirty,

miscalibrated, or has reached the end of its useful life will give an error

message E06 or E07 on the meter display. Your ISFET probe is warranted to

be free from manufacturing defects for six (6) months from the date of

purchase.

Table of Contents

Two-Point Calibration Quick Reference Guide . . . . . . . . . . . . . . . . . . . . . . . .1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Techniques and Tips for Best Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Display Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Keypad Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Connecting Electrodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

pH Calibration and Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Important Notes for Best Calibration Results. . . . . . . . . . . . . . . . . . . . . . . . . . 9

Calibration with Two Buffers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Calibration with One Buffer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

How to Abort Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Automatic Temperature Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Manual Temperature Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

mV Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Temperature Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Cleaning and Reconditioning ISFET Probes . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Cleaning with Detergent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Reconditioning with Warm Buffer . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Cleaning with Alcohol or Methanol . . . . . . . . . . . . . . . . . . . . . . . . . 16

Cleaning with Sodium Hypochlorite. . . . . . . . . . . . . . . . . . . . . . . . . 16

Cleaning and Reconditioning BNC Electrodes . . . . . . . . . . . . . . . . . . . . . . . . 17

Cleaning with Detergent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Reconditioning with Warm Buffer . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Cleaning with Acid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Cleaning with Methanol or Acetone . . . . . . . . . . . . . . . . . . . . . . . . .

117

Cleaning with Pepsin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Etching with Ammonium Biflouride. . . . . . . . . . . . . . . . . . . . . . . . . 18

Titrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Battery Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Automatic Shutoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

AC Adapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Techniques and Tips for Best Performance

DO: (ISFET non-glass probe ONLY) Soak the probe in pH 7.00 buffer for

at least five minutes if the probe is new or has been stored dry for an extended

period. This will hydrate the sensor and dissolve any reference material,

which may have crystallized on the sensor surface.

DO: (ISFET non-glass probe ONLY) Clean the probe regularly with a

toothbrush and mild detergent.

DO: (ISFET non-glass probe ONLY) STORE THE PROBE DRY with the

black protective cap covering the probe tip. No electrode storage solution is

required.

DO: (BNC probe ONLY) Store the probe in electrode storage solution.

DO: Always begin each measuring session with a two-point calibration.

Update often with one-point or two-point calibrations.

DO: Use fresh buffers and deionized rinse solution.

DO: Use buffer solutions with pHvalues no greater than three pH units apart.

Buffers should bracket the anticipated values of the samples to be measured.

DO: Choose buffer solutions that most closely mimic the chemical nature and

conductivity level of the sample solutions to be measured.

DO: Use deionized water to rinse residual buffer and sample solutions from

the probe after calibration and measurement.

DO: Calibrate at the same temperature as the sample solution. Although the

meter has automatic temperature compensation, best results will be achieved if

the calibration buffers and sample are the same temperature.

DO: Keep the connectors clean and dry. Dirty or damp connectors can cause

unstable readings.

DO: Be sure the surface of the sensor in the probe is free from any deposits or

films. See the cleaning instructions in this manual.

DO: Contact IQ Scientific Instruments if your pH testing involves monitoring

small pH changes over time (i.e. titrations).

DO NOT

DO NOT: change probe types (switch between BNC and ISFET probes)

while the meter is turned on. Always turn off the meter before changing

probes.

DO NOT: simultaneously use ISFET and BNC probes. Only have one type

of probe attached to the pH meter at a time.

DO NOT: store an ISFET probe in solution or use for long-term pH

measuring applications. Unlike BNC electrodes, stainless steel ISFET

electrodes should be stored dry. Extended immersion will shorten the life of

the probe.

DO NOT: leave an ISFET probe uncapped for long periods of time. Always

place the protective cap over the probe tip when finished measuring.

DO NOT: allow oil, fat, food particles, starch, protein, or other materials to

remain on the probe tip after use.

DO NOT: use a sharp metal object (needle, pin, etc.) to clean the sensor

surface.

DO NOT: take readings in direct sunlight. Direct sunlight may cause unstable

readings or difficulty in calibration. Call IQ Scientific Instruments or your

Authorized Dealer for optional light shields.

DO NOT: use the probe in an environmentthat will damage the pH sensor,

such as hydrofluoric acid or abrasive samples.

DO NOT: use the probe in environments that will damage the epoxy

materials used in probe construction, such as, acetone, toluene, methylene

chloride, xylene, and other strong organic solvents.

DO NOT: use in environments with static electricity. Electrostatic discharge

may permanently damage the probe.

DO NOT: expose the ISFET probe to repeated temperature extremes (60 oC or

higher). Do not use the probe for applications that require the probe to cycle

between hot and room temperature samples.

DO NOT: put any other active measurement devices in buffers or samples

while measuring pH. Even if another device is not actually turned on, AC

power interference can still occur, especially if the pH meter AC battery adapter

is in use.

Display Features

1. Main Display. Displays pH, mV or Temperature.

2. pH Mode and pH Stabilization Indicator. pH is displayed when the meter is

measuring pH. This symbol will flash until a stable reading (endpoint) is

reached.

3. mV Mode Indicator.

4. Temperature Mode Indicator.

5. Calibration Mode Indicator.The CAL symbol is displayed when the meter

is in pH or temperature calibration mode.

6. ISFET Probe Indicator.PROBE is displayed when pH meter has detected the

presence of an ISFET probe. The PROBE icon is not displayed when the pH

meter is using a BNC electrode. FlashingPROBE icon indicates pending ISFET

probe failure.

7. One-Point Calibration Mode Indicator. 1PT is displayed when the meter is set for

making a one-point calibration.

8. Two-Point Calibration Mode Indicator.2PT is displayed when the meter is

set for making a two-point calibration.

9. Low Battery Indicator. BATT is displayed when approximately 10 hours of

battery life remain. Replace battery as soon as possible.

Keypad Functions

ON Turns the meter ON and OFF. When turned off, the

OFF meter retains the calibration in memory.

pH Selects 0.01 pH resolution, 0.1 pH resolution and mV

mV mode.

TEMP Selects Temperature mode. Repeatedly pressing TEMP

toggles between oC and oF.

CAL Selects the Calibration mode.

SELECT Scrolls through calibration buffer values.

BUFFER

↑↑ ↓↓ (CAL and SELECT BUFFER keys) Used to manually

set temperature compensation.

ENTER Used to confirm a displayed buffer value and begin

calibration. Used to set manual temperature compensation

value.

Connecting Electrodes

The meter is designed to use only one electrode at a time. The meter

automatically identifies whether a BNC or ISFET probe is attached when the

meter is first turned on. Always turn off the meter when changing electrodes.

CAUTION: Do not operate meter with both an

ISFET and a BNC probe attached.

1. ISFET pH Probe Connector.

The IQ150 Dual Technology pH meter accepts ISFET non-glass pH

electrodes. The temperature sensor is built-in to the ISFET probe so a

separate temperature probe is not required

2. Temperature Probe Connector for use with BNC Electrodes.

The temperature probe uses a 3.5 mm phono jack. When a temperature

probe is connected, the meter will Automatically Temperature

Compensate (ATC) pH values. Use only 30KÙ thermistors. Contact IQ

Scientific Instruments for temperature probes or pH electrodes with built-

in temperature sensors.

3. BNC Connector for Electrodes.

The IQ150 Dual Technology pH meter accepts any pH, ORP, or Ion

Selective Electrode with BNC connector. Be sure that both the

receptacle on the meter and the connector on the probe are clean and dry;

wet or dirty connections may cause unstable readings.

pH Calibration and Measurement

Range

The IQ150 can measure from pH 0 to 14. Temperature compensation is

automatic from 0 oC to + 100 oC. The meter can perform a one or two point

calibration using any buffer listed below.

Calibration Buffer Options

1.68, 4.01, 6.86, 7.00, 9.18, 10.01, and 12.45.

Caution: It is recommended that you avoid

temperatures above 60 oC (140 oF) when

possible. Elevated temperatures shorten the

life of pH probes.

Hints For Best Calibration Results

•Always begin each measuring session with a two-point calibration.

•Calibrate no greater than 3 pH units apart.

•If the ISFET probe is new or has not been in regular use, soaking the

probe in pH 7.00 buffer for at least 5 minutes is recommended.

•For best accuracy, when working at non-ambient temperatures, allow

the probe to equilibrate to the temperature of the buffer or sample

solution before starting calibration or pH measurement.

•Erroneous readings will occur if the meter is incorrectly calibrated; e.g.

setting the Buffer Value to pH 7.00 when the probe is in pH 4.00 buffer.

If unusual behavior occurs, turn the meter off, turn the meter back on,

recheck the buffer values, and recalibrate the meter.

•If calibration times are excessive (over 2 minutes) follow the cleaning

and reconditioning instructions in this manual.

•If you are calibrating with tris buffer, please contact IQ Scientific

Instruments for the best probe recommendation.

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