Elcometer 148 User manual

English

Elcometer 148

pH Tester

Operating Instructions

English

This product meets the Electromagnetic Compatibility Directive.

The product is Class B, Group 1 ISM equipment according to CISPR 11.

Group 1 ISM product: A product in which there is intentionally generated and/or used conductively coupled

radio-frequency energy which is necessary for the internal functioning of the equipment itself.

Class B products are suitable for use in domestic establishments and in establishments directly connected

to a low voltage power supply network which supplies buildings used for domestic purposes.

Note: In the close presence of some radio transmitters, erroneous readings may be given. If this occurs

tests should be repeated at another location.

is a registered trademark of Elcometer Limited.

All other trademarks acknowledged.

retrieval system or otherwise) or translated into any language, in any form or by any means (electronic,

mechanical, magnetic, optical, manual or otherwise) without the prior written permission of

Elcometer Limited.

A copy of this Instruction Manual is available for download on our Website via www.elcometer.com.

Doc.No. TMA-0474 Issue 02

Text with Cover No: 21770

CONTENTS

Section Page

1 About this gauge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2 Getting started. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Taking a pH measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 Display panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

6 Maximum/Minimum recording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

7 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

8 Technical specification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

9 Spares & Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

10 Related equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Thank you for your purchase of this Elcometer 148 pH Tester. Welcome to Elcometer.

Elcometer are world leaders in the design, manufacture and supply of inspection equipment. Our products

cover all aspects from development through application to post application inspection.

With the purchase of this product you now have access to the worldwide service and support network of

Elcometer. For more information visit our website at www.elcometer.com.

1 ABOUT THIS GAUGE

This gauge is a simple but effective instrument which is used to determine the pH value in countless

applications which include leather production, chemical processing, food production, beauty care and metal

finishing.

The pH value of a liquid describes its acidity or alkalinity with a scale of 1-14. Pure water is said to be neutral

with a value of 7pH.

The pH value of a liquid is measured at a specific temperature. For a meaningful comparison of data, each

measurement should be taken at the same temperature.

Although Redox (ORP) could be measured, this feature is not provided in the Elcometer 148.

1.1 FEATURES

• Dual pH and temperature display

• Waterproof to IP57 Standard and floats on water

• Able to display temperature in °C or °F

• Able to record maximum and minimum temperature readings in a series of tests

1.2 WHAT THE BOX CONTAINS

• Elcometer 148 pH Tester

• pH/Temperature Sensor

• 4 x AAA Batteries

• Wrist strap

• pH4 calibration sachet

• pH7 calibration sachet

• Operating instructions

The Elcometer 148 pH Tester is packed in a cardboard and foam package. Please ensure that this

packaging is disposed of in an environmentally sensitive manner. Consult your local Environmental

Authority for further guidance.

To maximise the benefits of this instrument please take some time to read these Operating

Instructions. Do not hesitate to contact Elcometer or your Elcometer supplier if you have any

questions.

1.3 STANDARDS

The Elcometer 148 pH Tester can be used in accordance with ASTM E 70.

2 GETTING STARTED

1. Remove the protective cap. Unscrew the storage

Soaker Cap from the probe. Do not dispose of the

storage solution as it is required to keep the electrodes

wet and ready for continuous measurement.

2. If the electrode sensor is dry, a slow and sluggish

reading will result. Soak the electrodes in water or pH

solution for 15-30 minutes before use.

3. Rinse the sensor in tap water or preferably distilled

water.

4. Press the ON/OFF button once to switch on.

5. Temperature display is factory preset to °C. To switch

the display to °F reading, press and hold-down the

Mode button until reading is displayed in °F

6. Repeat step 5 to return it to °C.

7. Always replace storage soaker cap with some solution

in before storing the instrument.

Attach wrist strap here

Battery Cap

°C-°F Button

Sensor

Probe Electrode

Display

On-Off CAL Button

Unscrew lock ring to

release electrode

Storage Soaker Cap

(unscrew to release from probe)

Protective Cap

3 CALIBRATION

Calibration should be performed as frequently as possible to ensure accurate measurement, depending on

the frequency of tests performed. Additional calibration solution should be purchased for future needs (See

“Spares & Accessories” on page 10).

1. Cut open the shorter end of the pH7 calibration sachet.

2. Dip the sensor fully into the sachet, stir a little to remove the bubbles.

3. Press and hold-down the ON/OFF/CAL button until CAL is displayed, followed by a flashing 7.00.

4. When SA is displayed followed by End, calibration is complete and the unit resumes measurement.

5. Rinse the sensor with distilled water and blot dry before proceeding.

6. To perform a second point calibration, choose either pH4 or pH9 solution for calibration. For example,

if you are measuring between pH7 and pH4, then pH4 should be selected.

7. Cut open the short end of the calibration sachet.

8. Dip the sensor fully into the sachet and again stir gently to remove any bubbles.

9. Press and hold-down the CAL button until CAL is displayed, which should be followed by a flashing

4.00 (or 9.00).

10. When Elcometer 148 pH Tester displays %, followed by SA, then End, calibration is completed and the

unit resumes measurement.

11. Rinse the sensor with distilled water and blot dry before proceeding.

12. To perform a third point calibration, repeat 6 to 11 with the other solution.

13. ERROR CODE: If SA does not appear after calibration, calibration has failed. Check if electrode is

damaged by swopping for a new one.

14. Always perform a single point calibration with pH7 first before performing the second or third

point calibration.

15. After each successive second and third point calibration, the ‘percentage of slope’ % reading will be

displayed. This is an indication of the condition of the electrode. If the % reading shows 100%, it

means the electrode is in good condition. However, if the % reading is below 70% or above 130%, then

the electrode has deteriorated and should be replaced.

4 TAKING A pH MEASUREMENT

1. Switch on the unit

2. Rinse the electrode in water then shake the unit dry with a snap motion as shaking a mercury

thermometer.

3. Dip the sensor into test solution, shake to remove bubbles.

4. Once the reading stabilises, a reading is established.

5. Press the Hold button once to freeze the display, press again to release it for another reading.

6. Always rinse the electrode before and after each test.

5 DISPLAY PANEL

Reading frozen or on Hold

Lowest recorded reading displayed

Highest recorded reading displayed

Calibration mode activated

Measurement Reading

Unit of measurement

Current measurement Function

Temperature Reading

Automatic Temperature

Compensation activated

6 MAXIMUM/MINIMUM RECORDING

1. To register the maximum and minimum reading over a series of tests, press and hold-down the Hold/

Max-Min button until the display shows MAX and MIN blinking.

2. In this mode, proceed to make a series a tests.

3. To display the highest and lowest reading for the series of tests, press the Hold/Max-Min button once,

the highest reading will appear with the Max icon momentarily followed by the lowest reading with the

Min icon, following which the unit resumes measurement.

4. To stop or make a new recording, press and hold-down the Hold/Max-Min button until the MAX and

MIN annunicator disappear. Repeat step 1 to begin new recording.

5. Auto shut-off is disabled when recording is activated.

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