Lovibond SensoDirect pH110 Bedienungsanleitung

SensoDirect pH110

pH - Instruction Manual

Lovibond®Water Testing

Tintometer®Group

SensoDirect pH110

CONTENTS

1. GENERAL DESCRIPTION

2. SPECIFICATION

3. FUNCTIONAL DESCRIPTION

4. CALIBRATION

4-1 Overview

4-2 Equipment required

4-3 Two Point Calibration

4-4 Single Point Calibration

5. TAKING MEASUREMENTS

6. CHANGING THE BATTERY

7. ACCESSORIES

1. GENERAL DESCRIPTION

* General purpose pH meter with broad application including AQUARIA & FISH

HATCHERIES, FOOD & BEVERAGE PROCESSING, PHOTOGRAPHY, LABORATORY,

QUALITY CONTROL, EDUCATION, SWIMMING POOLS & WATER CONDITIONING

* High quality, compact unit that is designed for easy operation

* Water resistant front panel with easy to read LCD display and rubberised function

keys

Unpacking

Please check that the shipment includes the following items:

• Lovibond®SensoDirect pH110

• Lovibond®SensoDirect pH sensor plastic/gel-type with BNC plug

• 9V Battery

• Protective cover

• 7 Screws

• Screwdriver

• Plastic Cover Calibration Screws

• Instruction Manual

Battery installation

Prior to ﬁrst use take the instrument out of the protective cover open the battery

compartment and insert the 9V battery.

Ensure polarity is correct.

SensoDirect pH110

Protective Cover

The instrument is equipped as standard with the protective cover.

Prior to the ﬁrst measurement please ﬁx the cover by using the enclosed srews. The

protective armouring ensures reliable operation even in harsh environments.

When the instrument is used without the protective cover please use the enclosed

plastic cover to protect the calibration screws against dust and humidity.

2. SPECIFICATION

Display LCD, 21.5 mm (0.7“) digit height

Measurement Range 0 - 14 pH

Resolution 0.01 pH

Accuracy ± 0.07 pH (pH 5 - pH 9)

± 0.1 pH (pH 4 - pH 10)

± 0.2 pH (pH 1 - pH 3.9, pH 10.1 - pH 13)

Main instrument only

23 ± 5°C, after calibration

Input Impedance 1012 Ohms

Temperature

Compensation No adjustment

Sample Time Approx. 0.4 seconds

Operating Temperature 0 - 50°C (32 - 122°F)

Operating Humidity Maximum 80% relative humidity

Calibration External, pH 4.0 (slope adjustment) & pH 7.0 (Cal.

adjustment)

Power Supply 006P DC 9V battery

Power Consumption Approx. 2.0 mA

Dimension 208 x 110 x 34 mm (L x W x H)

Weight Approx. 380 g

pH electrode pH plastic type, gel electrolyte with BNC connector

SensoDirect pH110

3. FUNCTIONAL DESCRIPTION

Figure 1

1 Display

2 Power ON Button

3 Power OFF Button

4 Data Hold Button

5 BNC socket for pH electrode

6 Calibration pH 7 Adjust

7 Slope pH 4 pH10 Adjust

8 Battery compartment/cover

9 Stand

10 Protective cover

4. CALIBRATION

4-1 Overview

The meter is supplied with calibration by mV signal that simulates an ideal pH

electrode mV output (0 mV at pH 7, based on 25°C working temperature). Ho-

wever, because most pH electrodes do not exactly replicate the ideal electrode and

because the working temperature may differ from 25°C, it is necessary to calibrate

the instrument to ensure measurement accuracy of the combined pH electrode.

SensoDirect pH110

4-2 Equipment Required

i) Combination pH electrode

ii) pH 4.0 & pH 7.0 buffer solutions

4-3 Two Point Calibration

i) Connect the pH electrode to the BNC socket (Figure 1, 5) and immerse

in pH 7.0 buffer solution.

ii) Switch the instrument on by pressing the Power ON Button (Figure 1, 2).

iii) Adjust „pH 7 Adjust „ (Figure 1, 6) until the display reads exactly pH 7.0.

iv) Rinse the electrode in distilled water.

v) Place the electrode into buffer pH 4.0 solution.

vi) Adjust „pH 4 Adjust „ (Figure 1, 7) until the display reads exactly pH 4.0.

vii) Rinse the electrode in distilled water.

viii) Repeat steps iii) to vii) at least twice.

4-4 Single Point Calibration

i) Connect the pH electrode to the BNC socket and immerse in a standard

buffer solution (eg pH 7.0 or higher if available).

ii) Switch the instrument on by pressing the Power ON Button (Figure 1, 2).

iii) Adjustthe“pH7Adjust„(Figure1,7)untilthedisplayreadsthesame valueasthe

standard buffer solution used.

5. TAKING MEASUREMENTS

After calibration, the unit is ready for taking measurements.

i) Connect the pH electrode to the BNC socket.

ii) Switch the instrument on by pressing the Power ON Button.

iii) Immersethe electrodein the solution beingmeasured;theinstrumentwilldisplaythe

pH value.

iv) During measurement, pressing the Data Hold Button (Figure 1, 4) will freeze the

display. At the same time the display will show a Data Hold indicator. To release

the display freeze function, press the Data. Hold Button again; the Data Hold

indicator will disappear from the display.

v) After taking a measurement, rinse the electrode in distilled water.

SensoDirect pH110

6. CHANGING THE BATTERY

i) „ “ in the left corner of the display indicates that it is necessary to replace the

battery. However, accurate measurements may still be made for several

hours after the Low Battery” indicator ﬁrst appears.

ii) Remove the protective cover before replacing the battery. To replace the battery,

remove the Battery Compartment Cover (Figure 1, 9) on the rear of the

meter.

iii) Remove the battery, install a replacement one (006P DC 9V) and

replace the battery compartment cover.

7. ACCESSORIES

721330 pH Electrode, plastic type, gel electrolyte with BNC connector

721247 pH Buffer Solution pH 4 (25°C) red, 90 mL, traceable to N.I.S.T.

721248 pH Buffer Solution pH 7 (25°C) red, 90 mL, traceable to N.I.S.T.

721249 pH Buffer Solution pH 10 (25°C) red, 90 mL, traceable to N.I.S.T.

8. IMPORTANT INFORMATION FOR pH ELECTRODES

General information:

Non-reﬁllable gel electrodes are wear parts. The service life and the measurement

accuracy depend signiﬁcantly on application, storage and maintenance. Improper

storage as well as special samples with e.g. aggressive chemicals, high contamina-

tion potential and high temperatures can reduce the service life to few months or

even weeks. Samples with low conductivity (very low salinity) extend the response

time of electrodes. Electrodes are subjected to a natural ageing effect, which in-

duces shift of the offset point and gradient of the electrode. For slowing down the

ageing effect and for maintaining the performance and accuracy, please note the

following considerations:

SensoDirect pH110

NotesStorage:

Never store electrodes in distilled water!

- Short-term storage (few hours): in tap water

- Medium-term storage (some days): in pH 4 buffer solution

- Longer-term storage: in 3 M KCl solution

In case of drying out (KCl solution is crystallized), please store the electrode for

minimum 5 hours in 3 M KCl solution (order code 2418609) or tap water in such

a way that water covers the glass part completely. Afterwards, the electrode has

to be stored in 3 M KCl solution.

Handling of measurement and calibration

1. Prior to each immersion into sample or buffer solution please rinse the electrode

with distilled water/tap water for removal of possible residues of salt and to mini-

mize carryover effects.

2. In case of air bubbles, remove them by shaking.

3. During measurement/calibration, a ﬂow rate is necessary (water ﬂow/slewing

of the electrode).

4. After each use, the electrode shall be rinsed with distilled water/tap water and

covered by a destined cap (ﬁlled with KCl solution).

Cleaning:

For longer service life, electrodes shall be cleaned as following:

- Water soluble contaminations: distilled water (tap water)

- Chalk and hydroxide deposits: Hydrochloric acid (10 %)

- Fats and oils: Warm water and mild detergents (dishwashing detergent)

Attention: Do not use petroleum, ether or similar chemicals for plastic-covered

electrodes.

Technical changes without notice

Printed in Germany 02/16

No.: 00 38 61 41

Lovibond®and Tintometer®

are Trademarks of the

Tintometer Group of Companies

Tintometer India Pvt. Ltd.

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Toll Free: 1 800 102 3891

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