eDAQ EA168 Manuale utente
e-corder
®
www.
eDAQ
.com
eDAQ Amp User Manual
Quad pH/mV Amp
EEEE
E/2 E/2 E/2 E/2
Ref Ref Ref Ref
Channel 1 Channel 2 Channel 3 Channel 4
168
On-line On-line On-line On-line
isolated
ii
Quad
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
Mac OS, and Macintosh, are registered trademarks
of Apple Computer, Inc. Windows 98, Windows
Me, Windows 2000, and Windows XP are
trademarks of Microsoft Corporation.
PostScript, and Acrobat are registered trademarks of
Adobe Systems, Incorporated.
All other trademarks are the properties of their
respective owners.
Product: Quad pH/mV Amp (EA168)
Document Number: U-EA168-1005
Copyright © October 2005
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.
Quad pH/mV Amp
iii
Contents
1
Overview
1
How to Use this Manual 2
Checking the Quad pH/mV Amp 2
.eDAQ Amps 2
2
The pH/mV Amp
5
The Front Panel 6
The Electrode and Reference Inputs 6
The On-line Indicators 6
The Back Panel 7
The Signal Outputs 7
I
2
C Connector 8
Connecting to the e-corder 8
The pH/mV Amp Self Test 9
Using Chart and Scope 10
Setting up the Quad pH/mV Amp 10
Previewing the Signal 10
3
Electrode Calibration
15
Signal Calibration 16
Temperature Compensation 21
Manual Temperature Compensation 21
Automatic Temperature Compensation 22
Isopotential Point 24
Viewing Electrode Response 24
Manual Compensation Response 25
Removing the Calibration 26
A
Technical Aspects
27
Quad pH/mV Amp Operation 27
Technical Description 27
B Troubleshooting
29
C Specifications
31
D
Electrode Behavior
33
The Nernst Equation 33
Electrode Response 34
The Isopotential Point 34
Non-Linear Calibration 35
Index
37
License & Warranty
39
E
E/2
Ref
Channel 1
168
On-line
isolated
iv
Quad
pH/mV Amp
Quad pH/mV Amp
1
CHAPTER ONE
1
Overview
The eDAQ Quad pH/mV Amp is designed to work with an e-corder
system, recording signals from:
• pH electrodes (either combination, or half cell electrodes)
• potentiometric ion selective electrodes (ISEs)
• redox (or ORP, oxidation–reduction potentiometric) electrodes
• other high impedance sources up to ±2 V requiring electrometer
input.
Signals from up to four electrodes can be recorded simultaneously.
2
Quad
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 Quad pH/mV Amp
Before you begin working with the Quad 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 Quad pH/mV Amp is part of a family of preamplifiers known as
eDAQ Amps.
The Quad pH/mV Amp is designed for recording signals from up to
four 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.
Chapter 1 —
Overview
3
The range of eDAQ Amps includes the:
•
Quad pH/mV Amp
, suitable for connection of pH, ion selective,
and potentiometric (ORP) electrodes
•
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.
•
QuadStat
, a four channel, three electrode potentiostat suitable for
use with amperometric biosensors. Current gain ranges of 2 nA
to1 mA/channel 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
Quad
pH/mV Amp
Quad pH/mV Amp
5
CHAPTER TWO
2
The pH/mV Amp
This chapter describes how to connect and use your eDAQ Quad
pH/mV Amp.
IMPORTANT:
Always make sure that the
e-corder
is turned off before
you connect or disconnect the Quad pH/mV Amp. Failure to do this
may result in damage to the
e-corder
and/or the pH/mV Amp.
6
Quad
pH/mV Amp
The Front Panel
The
front panel of the Quad pH/mV Amp is shown in Figure 2–1.
The Electrode and Reference Inputs
The BNC input connectors marked ‘E’ of the pH/mV Amp provide
connection for combination pH, ISE or ORP electrodes. Combination
electrodes have an internal reference and no separate reference
electrode is required.
Some electrodes do not have an internal reference (most ISEs and ORP
electrodes and occasionally some pH electrodes). These electrodes,
which are referred to as half cell electrodes, will need to be used with a
separate reference electrode. Half cell electrodes should be connected
to the BNC input connector marked ‘E/2’. The separate reference
electrode is connected to the 4 mm socket marked ‘Ref’.
The On-line 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.
EEEE
E/2 E/2 E/2 E/2
Ref Ref Ref Ref
Channel 1 Channel 2 Channel 3 Channel 4
168
On-line On-line On-line On-line
isolated
Reference electrode input,
4 mm socket
Electrode inputs, BNC connectors. For combination electrodes
On-line indicator
Half cell electrode input,
BNC connector
Figure 2–1
The Quad pH/mV Amp
front panel
Indice
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