eDAQ e-corder pH/mV Amp Manuel utilisateur
e-corder
®
www.
eDAQ
.com
eDAQ Amp User Manual
pH/mV Amp
pH / mV Amp
Electrode Reference
Temperature
ii
pH/mV Amp
This document was, as far as possible, accurate at
the time of printing. Changes may have been made
to the software and hardware it describes since
then: eDAQ Pty Ltd reserves the right to alter
specifications as required. Late-breaking information
may be supplied separately. Latest information and
software updates can be obtained from our web
site.
Trademarks of eDAQ
e-corder
and PowerChrom are registered trademarks
of eDAQ Pty Ltd. Specific model names of data
recording units, such as
e-corder
201, and
PowerChrom 280, are trademarks of eDAQ Pty Ltd.
Chart and Scope are trademarks of ADInstruments
Pty Ltd and are used under license by eDAQ.
EChem is a trademark of eDAQ Pty Ltd.
Other Trademarks
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of Apple Computer, Inc. Windows 98, Windows
Me, Windows 2000, and Windows XP are
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All other trademarks are the properties of their
respective owners.
Product: pH/mV Amp (EA165)
Document Number: U-EA165-1103
Copyright © November 2003
eDAQ Pty Ltd
6 Doig Avenue
Denistone East, NSW 2112
AUSTRALIA
http://www.eDAQ.com
email: [email protected]
All rights reserved. No part of this document may be
reproduced by any means without the prior written
permission of eDAQ Pty Ltd.
pH/mV Amp
iii
Contents
1
Overview
1
How to Use this Manual 2
Checking the pH/mV Amp 2
.
eDAQ Amps 2
2
The pH/mV Amp
5
The Front Panel 6
The Electrode and Reference Input 6
The Online Indicators 6
The Temperature Input 7
The Back Panel 7
The Signal Outputs 8
I
2C Connector 8
Connecting to the e-corder 8
The pH/mV Amp Self Test 10
Using Chart and Scope 10
Setting up the pH/mV Amp 10
Previewing the Signal 11
Setting up the Temperature Amp 14
The Temperature Probe 17
3
pH Calibration Extension
19
Electrode Calibration 20
Temperature Compensation 25
Manual Temperature Compensation 25
Automatic Temperature Compensation 26
Isopotential Point 28
Viewing Electrode Response 28
Manual Compensation Response 29
Removing the Calibration 30
A
Technical Aspects
31
pH/mV Amp Operation 31
Technical Description 32
B
Troubleshooting
35
C
Specifications
37
D
Electrode Behavior
39
The Nernst Equation 39
Electrode Response 40
The Isopotential Point 40
Non-Linear Calibration 41
Index
43
License & Warranty
45
pH / mV Amp
Electrode Reference
Temperature
iv
pH/mV Amp
pH/mV Amp
1
CHAPTER ONE
1
Overview
The eDAQ pH/mV Amp is designed to work with an e-corder system,
recording signals from:
• pH electrodes
• potentiometric ion selective electrodes (ISEs)
• redox (or ORP, oxidation–reduction) potentiometric electrodes
• other high impedance sources up to ±2 V requiring electrometer
input.
The in built temperature amplifier can be used to provide automatic
temperature compensation (ATC) for pH and ion selective electrodes.
This chapter provides an overview of the pH/mV Amp, and describes
its basic features.
2
pH/mV Amp
How to Use this Manual
This manual describes how to set up and begin using your pH/mV
Amp. The use of the pH/mV Amp with the Chart software pH
Calibration extension is discussed. The appendices provide technical
and troubleshooting information.
Checking the pH/mV Amp
Before you begin working with the pH/mV Amp, please check that:
• all items described in the packing list are included; and that
• there are no signs of damage that may have occurred during
transit.
Contact your eDAQ distributor if you encounter a problem.
You should also become familiar with the basic features of your
e-corder
system, which are discussed in the
e-corder
Manual
on the
Installer CD.
.
eDAQ Amps
The pH/mV Amp is part of a family of preamplifiers known as eDAQ
Amps.
The pH/mV Amp is designed for recording signals from pH and other
potentiometric electrodes. As with other eDAQ Amps, it is designed to
be operated under full software control and is automatically recognized
by Chart or Scope software which controls its gain range, signal
filtering, and other settings.
The range of eDAQ Amps includes the:
•
pH/mV Amp
, suitable for connection of pH, ion selective, and
potentiometric (ORP) electrodes
Chapter 1 —
Overview
3
•
Potentiostat
, a three–electrode potentiostat that can be used for
voltammetric and amperometric experiments. Gain ranges of 20 nA
to 100 mA in 1:2:5 steps.
•
Picostat
, a high sensitivity three–electrode potentiostat suitable for
use with carbon fibre and other microelectrodes. Current gain
ranges of 10 pA to 100 nA in 1:2:5 steps.
•
Bridge Amp
, suitable for sensors requiring a low drift, high gain
differential amplifier. Also provides DC excitation
•
GP Amp
, suitable for high output sensors requiring a high
impedance single ended or differential amplifier. Also provides DC
excitation.
See our web site at www.eDAQ.com for more information.
4
pH/mV Amp
pH/mV Amp
5
CHAPTER TWO
2
The pH/mV Amp
This chapter describes how to connect and use your pH/mV Amp.
IMPORTANT:
Always make sure that the
e-corder
is turned off before
you connect or disconnect the pH/mV Amp. Failure to do this may
result in damage to the
e-corder
and/or the pH/mV Amp.
6
pH/mV Amp
The Front Panel
The
front panel of the pH/mV Amp is shown in Figure 2–1.
The Electrode and Reference Input
The BNC input connector of the pH/mV Amp provides connection for a
pH, ISE or redox electrode. Combination electrodes (that is those with
an internal reference) will only need to be connected to this input.
Electrodes that do not have an internal reference (most ISEs and some
pH electrodes), will need to be used with a separate reference
electrode. This electrode can be connected via the 4 mm Reference
socket. This is in common with the shield (ground) of the BNC electrode
input connector.
The Online Indicators
When lit, these indicate that the software (such as Chart or Scope) has
located and initialized the pH/mV Amp. If the light does not go on
when the software is run, check that the pH/mV Amp is properly
connected. There are two indicators, one to show connection of the
electrode signal, and the second to show connection of the temperature
signal.
pH / mV Amp
Electrode Reference
Temperature
Temperature probe input,
3-pin mini-audio socket
On-line indicator,
temperature signal
Reference electrode,
4 mm socket
Electrode input,
BNC connector
On-line indicator,
electrode signal
Figure 2–1
The pH/mV Amp front
panel
Table des matières
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