Eutech Instruments pH 1000, pH 2500 User Manual

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Instruction Manual

pH 1000/ pH 2500

Bench pH/Ion Meter

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68X090800

Rev. 5 07/03

Instruction Manual pH 1000/ 2500

Preface

Thank you for choosing the pH 1000/ 2500 bench meter series. This manual serves to explain the use of the pH 1000/ 2500 Bench meter. The manual functions in two

ways, firstly as a step-by-step operational guide to help you familiarize with the meter’s features and functions. Secondly, it serves as a handy reference guide.

This instruction manual is written to cover as many anticipated applications and uses of the pH 1000/ 2500 bench meter as possible. If there are doubts in the use of the meter, please do not hesitate to contact the nearest Authorized Distributors.

Eutech Instruments/ Oakton Instruments cannot accept any responsibility for damage or malfunction to the meter caused by improper use of the instrument.

The information presented in this manual is subject to change without notice as improvements are made, and does not represent a commitment on the part of Eutech Instruments Pte Ltd/ Oakton Instruments.

Note: Eutech Instruments Pte Ltd/ Oakton Instruments reserves the right to make improvements in design, construction, and appearance of our products without notice.

Rev. 5 07/03

Instruction Manual pH 1000/ 2500

TABLE OF CONTENTS

1 INTRODUCTION 1 2 METER INFORMATION 1

2.1 Meter Parts 1

2.2 Customized LCD 1

2.3 Slide Out Card 1

2.4 Rear Instrument Panel 1

2.5 AC/DC-Adapter 2

2.6 Electrode 2

3 KEYPAD FUNCTIONS 3

3.1 Primary & Secondary Functions of Keypad 3

4 STARTING UP THE METER 6

4.1 Connecting the Sensor Electrode 6

4.2 Connecting the Temperature Probe 6

4.3 Connecting the AC/DC Adapter 6

4.4 Connecting the Chart Recorder 6

4.5 Connecting RS232C Cable 6

5 TURNING THE METER ON AND OFF 7 6 CALIBRATION 8

6.1 pH Calibration (With ATC) 8

6.1.1 1 Point pH Calibration 8

6.1.2 Option 1 - Standard Buffers 8

6.1.3 Option 2 - Non-Standard Buffers 9

6.2 Multi-Point pH Calibration (Up to 5 Points) 9

6.3 Special Topic: CAL EDIT (for Custom/Non-Standard Buffers) 10

6.4 pH Calibration (without ATC) 10

6.5 Relative mV Calibration 11

6.6 Ion Calibration (for pH 2500 only) 12

6.7 Temperature Calibration 13

7 MEASUREMENT: READY, CONTINUOUS AND HOLD 14

7.1 Measurement in the READY Mode 14

7.2 Measuring in the Continuous Mode 14

7.3 HOLD Function 14

7.3.1 Holding and Releasing a Measured Value 14

7.4 Measuring pH 15

7.5 Measuring mV 15

7.6 Measuring Relative mV 16

7.7 Measuring Ion (for pH 2500 only) 16

8 SETUP FUNCTIONS AND KEYS 17 9 PROGRAM 1: LAST CALIBRATION TIME, DATE AND TEMPERATURE 18 10 PROGRAM 2: MEMORY RESET AND AUTO-OFF FUNCTION 19 11 PROGRAM 3: SET CURRENT TIME AND DATE 19 12 PROGRAM 4: COMMUNICATION SETUP 20

12.1 Switching pH Resolution 22

12.2 Setting the READY Indicator 22

12.3 Setting the Audible Beep 22

12.4 Viewing pH Electrode Offset 22

12.5 Viewing pH Electrode Slope 22

12.6 Viewing Ion Electrode Slope (for pH2500 only) 22

12.7 Setting the High and Low Setpoint Alarm (pH/mV/Relative mV) 23

12.8 Setting & Activating the Timer 23

12.9 Setting the Timer 24

12.10 Activating the Timer 24

12.11 Memory Input Functions and Options 25

12.12 Print Functions and Options 26

12.12.1 Print Function Options 26

13 TROUBLESHOOTING AND ERROR MESSAGES 27

Instruction Manual pH 1000/ 2500

ELECTRODE CARE 28

14.1 Electrode Activation 28

14.2 Electrode Maintenance 28

14.3 Storing pH/ORP electrodes 28

15 METER SPECIFICATIONS 29 16 ACCESSORIES 30 17 WARRANTY 32 18 RETURN OF ITEMS 32

Instruction Manual pH 1000/ 2500

1 INTRODUCTION

Thank you for selecting pH1000/ 2500 bench meter. This step-by-step instruction manual gives you a detailed description on the use and operation of features on the meter. There are 2 models: pH1000 (pH/ mV/ Relative mV/ Temperature/ RS232C) and pH2500 (pH/ Ion/ mV/ Relative mV/ Temperature / RS232C). These meters are designed to be user-friendly while providing unprecedented levels of accuracy, repeatability and reliability.

The pH 1000/ 2500 bench meter is an advanced microprocessor-based (ASIC-Application Specific Integrated Circuit) ideal for routine measurement that best meets discerning user’s individual needs. This feature-rich meter has splash-proof keypad, simultaneous pH/ mV/ Ion and temperature display on a large angled custom LCD. Besides, the meter allows user customization via its SETUP feature, making the unit more powerful and user-friendly to cater to your individual needs. This instruction manual is illustrated with useful hints and diagrams that show which specific key-presses to access for each function.

2 METER INFORMATION

The pH 1000/ 2500 bench meter is packaged in a corrugated box which is made of environmentfriendly materials and can be re-cycled.

2.1 Meter Parts

The instrument is designed to give an aesthetic look as well as ergonomic functionality. A large custom dual LCD is provided at an angle for optimum viewing. A splash proof keypad with audible tactile response gives you a good feel of the instrument. A slide-out instruction card offers a handy reference in case of doubts. Listed below are the major parts of the meter.

2.2 Customized LCD

The pH 1000/ 2500 bench meter is characterized by large dual custom LCD (Liquid Crystal Display). The display has also mode annunciators for pH, temperature, relative mV and mV readings. The secondary (lower) display shows the temperature readings simultaneously with the primary (upper) display of measured mode. Special annunciators such as graphical symbols, error messages, measurement units and modes of operation are arranged around the primary and secondary displays to give a comprehensive display. The integration of graphics and error messages into the LCD provides you a higher level of user-friendliness and easy readability.

2.3 Slide Out Card

A plastic slide out card is provided at the bottom of the bench meter. The function of this card is to provide a quick guide to the functions of the individual keys as well as to provide a useful trouble shooting reference.

2.4 Rear Instrument Panel

The pH 1000/ 2500 bench meter provides a set of connectors for the various accessories commonly used. In addition to all the connectors, pH 1000/ 2500 bench meter has an additional RS232C port to allow for data transmission between the meter and a printer or computer, Furthermore; it can be remotely controlled using a software from Eutech Instruments. Listed as follows are various connections available.

Instruction Manual pH 1000/ 2500

Connector Function

ATC For phono jack connection from the temperature probe for Automatic Temperature

Compensation. The probe should be a thermister type probe.

INPUT For connecting sensors with a BNC connector to the meter. The meter accepts any pH,

ORP or ISE electrode with a BNC connector. Always make sure that the connector is clean and dry.

REF For connection to the pin tip type reference electrode normally used with half cell (mono)

type pH or ISE electrodes.

REC For connection to the strip chart recorder.

GND For connection to the ground earth jack (standard pin tip connectors).

RS232C For connection to the RS232C serial port.

DC For connection to the AC power source to the power jack (DC).

Rear View of the Meter

2.5 AC/DC-Adapter

AC/DC adapters convert the power mains voltage 120/220 VAC to low DC voltage for the pH 1000/ 2500 bench meter operation. Two basic models of adapters are available depending upon power supply specification of each country. See accessories section.

2.6 Electrode

Electrode is one of the most important parts of the meter. The electrode glass membrane is fragile and must be handled with care. A protective rubber cap containing a suitable storage solution to protect the glass membrane and to maintain activation of the glass membrane covers the pH electrode provided with the meter (when ordered). A special protective guide for use during measurements is enclosed to offer added protection against damage to the pH electrode glass bulb during operation. Maintenance of electrode is necessary from time to time. Please refer to Section 14 on Electrode Care.

Instruction Manual pH 1000/ 2500

3 KEYPAD FUNCTIONS

The pH 1000/ 2500 bench meter is equipped with large tactile response keypad for ease of use. All keys have primary function with some keys having secondary functions.

3.1 Primary & Secondary Functions of Keypad

ON/OFF

Primary Function Turns meter on or off. Secondary Function None Numeric Value None

SHIFT

Primary Function Press to access the secondary functions of the meter. Secondary Function None Numeric Value None

YES

Primary Function

Secondary Function None Numeric Value None

Enter numeric values, confirm calibration points, or confirm and scroll program options or values selected.

Primary Function Use to cancel incorrectly selected numeric value or selection made. Secondary Function None Numeric Value None

Instruction Manual pH 1000/ 2500

CAL/MEAS

Primary Function

Secondary Function None Numeric Value None

Press to toggle between measurement and calibration modes of the meter - pH, Temperature, mV, Relative mV and Ion. Also use as exit from SETUP mode, secondary functions and to abort operation while in calibration mode.

1 / MODE

Primary Function Select one of four measurement modes: pH/mV/Relative mV/Ion. Secondary Function None Numeric Value 1

2 / HOLD

Primary Function Freeze the displayed value. Allow you to print the held reading or store it into memory. Secondary Function None Numeric Value 2

3 / SETUP / REL MV BASE

Primary Function

Secondary Function

Numeric Value 3

4 / ∆ / RESLN

Primary Function

Secondary Function Toggle the pH resolution between 0.01 pH and 0.1 pH. Numeric Value 4

Enter SETUP mode of the meter for customization of meter functions as well as view some diagnostic functions.

Display the Relative mV base value while in Relative mV mode and Ion Electrode Slope while in the Ion mode.

Select next higher pH buffer values in the pH calibration mode. Also used to scroll through SETUP mode options.

5 /∇ / SLOPE

Primary Function

Secondary Function

Numeric Value 5

Select the next lower pH buffer value option in pH calibration mode. Also used to scroll through some SETUP mode options.

Display the percentage slope of the pH electrode when in the pH mode. While in Ion mode, it displays slope of ion electrode in mV/decade.

6 / SET TEMP / OFFSET

Primary Function Press to calibrate ATC temperature probe or to set manual temperature. Secondary Function

Numeric Value 6

Displays the offset of pH electrode. This is useful as a diagnostic function to determine the quality of the probe that is connected to the meter.

Instruction Manual pH 1000/ 2500

7 / CAL EDIT / BEEP

Primary Function Press to edit pH buffer value while you are in pH calibration mode. Secondary Function Turns on or off ‘beep’ sound whenever a key-press is depressed.

Numeric Value 7

8 / ALARM / READY

Primary Function Enter the high and/or low alarm values. Secondary Function Turns on or off the READY function. Numeric Value 8

9 / ACTIVATE / SET TIMER

Primary Function Press to start timer countdown. Secondary Function Sets the time interval. Numeric Value 9

. / MI / OPT

Primary Function Stores the displayed value into memory. Secondary Function Activate different Memory Input Options, these include:

Numeric Value . (decimal point)

Data Log on Ready Data Log on Time Interval Set Time Interval for Data Log

0 / MR / OPT

Primary Function Recalls stored values from the memory in the Last-In-First-Out (LIFO) sequence. Secondary Function Activate different Memory Recall options. There are two options:

Numeric Value 0

Print all memory data Clear memory

+/- / PRINT / OPT

Primary Function Output the displayed data through the serial/RS232C port. Can be activated in the

Secondary Function Sets the different print options. There are three options:

Numeric Value +/-

measurement, HOLD functions and memory recall functions.

Print on ready Print on time interval Set print time interval

Instruction Manual pH 1000/ 2500

4 STARTING UP THE METER

4.1 Connecting the Sensor Electrode

Slide the sensor electrode connector of the electrode over the INPUT BNC socket. Then push the connector into the socket and turn the connector clockwise to lock into position. Do not use excessive force. This applies to combination pH/ORP/ISE electrodes. For half-cell sensors where a reference electrode is used, connect the sensor connector to socket marked (REF). Always ensure that the connectors are dry when connection is done.

4.2 Connecting the Temperature Probe

The temperature probe uses a phono jack to connect with the socket marked ATC on the meter. Insert the jack directly into the socket until it is firmly seated.

4.3 Connecting the AC/DC Adapter

Ensure that the power to the AC/DC adapter is switched off. Slide the AC/DC adapter jack into the socket marked DC of the meter until it is firmly seated. For AC/DC adapter always ensure that the power mains voltage matches that of the adapter used. AC/DC adapters used should have the following specifications or settings. Output:- Voltage: 9 V DC Current: 500 mA.

NOTE: Ensure that the input power mains voltage (120/220 V)

matches your adapter requirements.

4.4 Connecting the Chart Recorder

The meter provides a recorder output of +/- 2000 mV for transmission of readings either to a chart recorder or to a data acquisition device (Analog/Digital Cards). When the chart recorder is in operation, continuous absolute mV readings will be charted. Note that readings are independent of the operating mode and is uncompensated and set to a one to one (1:1) ratio. Where the charting is made in reference to ground potential, a cable is connected from the GND port of the meter to the chart recorder. Plug the phono connector to the meter at the designated port (marked REC). The tip (inner) connection should be wired to the high side of the recorder and the sleeve (outer) side should be wired to the low side of the recorder.

4.5 Connecting RS232C Cable

Noting the orientation of RS232C connector, insert the 9-pin male connector from your device (a printer or computer) into the RS232C port (marked RS232) of the meter. Fasten the RS232C connector using the two screws at the side of the male RS232C connector. Do not over-tighten.

Instruction Manual pH 1000/ 2500

5 TURNING THE METER ON AND OFF

Once the AC/DC adapter is connected and powered on, the meter beeps and the full LCD lights up for a few seconds to display all segments as a self-diagnostic test of the LCD. Then the meter will display the current time. To access the meter functions, press ON/OFF key. The meter beeps and performs a diagnostic test before going into the pH measurement [MEAS] mode. To turn the meter off, press ON/OFF key within the operation mode. The meter performs a self-diagnostic LCD test before displaying the current time.

IMPORTANT :

Remember to remove the protective cap from the electrode tip prior to measurement. Replace it in place after use or store electrode in some storage solution to avoid possible dehydration of glass bulb which may result in slow response.

In any case if the electrode is not i n use for long period, condition the electrode by soaking into tap water for 1-2 hours before use.

Make sure to wash electrodes/probes before/after each sample measurements to prevent any carry-over of samples.

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