Innova 1312 User manual

May 1997
1312 Photoacoustic Multi-gas Monitor
Instruction Manual
INNOVA
BE6002−11
1312 Photoacoustic Multi-gas Monitor

II 1312 Photoacoustic Multi-gas Monitor
INNOVA
Instruction Manual
Safety Considerations
The 1312 Photoacoustic Multi-gas Monitor complies with IEC348; Safety
Requirements for Electronic Measuring Apparatus and IEC1010–1; Safety
Requirements for Electrical Equipment for Measurement, Control, and
Laboratory Use, and is supplied in a safe condition. To ensure safe operation
and retain the 1312 in a safe condition, note the following:
EXPLOSION HAZARD!
TO AVOID THE POSSIBILITY OF AN EXPLOSION, MONITORING
OF FLAMMABLE GASES IN EXPLOSIVE CONCENTRATIONS MUST
NEVER BE ATTEMPTED.
Never operate the 1312 Photoacoustic Multi-gas Monitor in potentially explo-
sive environments.
When monitoring potentially flammable or toxic gases it is essential that:
• The instrument itself is placed in a well-ventilated area outside the poten-
tially hazardous zone.
• A sufficiently long tube is connected to the air-outlet on the back panel so
that the sampled gas is carried away to the open air or to an extraction
and/or filtration unit.
WARNINGS!
• Avoid water condensation in the instrument.
• Switch off all equipment before connecting or disconnecting their digital
interface. Failure to do so could damage the equipment.
• Whenever it is likely that the correct function or operating safety of the
apparatus has been impaired, the apparatus must be made inoperative and
be secured against unintended operation.
• Any adjustment, maintenance and repair of the open apparatus under volt-
age must be avoided as far as possible and, if unavoidable, must be carried
out only by trained service personnel.
• If a fault is reported by the monitor that indicates correct function of the
instrument may be impaired, consult your local Innova AirTech representa-
tive. Under no circumstances should repair be attempted by persons not
qualified in the service of electronic instrumentation.

BE6002−11 1312 Photoacoustic Multi-gas Monitor III
Instruction Manual
Safety Considerations
APPLYING POWER
Before using the 1312, check that it is set to match the available mains
voltage and that the correct fuses are installed.
SAFETY SYMBOLS
The apparatus will be marked with this symbol when it is important
that the user refers to the associated warning statements given in the
User Guide.
Frame or Chassis Protective earth Dangerous voltage
!
Copyright © 1997 Innova AirTech Instruments A/S
All rights reserved. No part of this publication may be reproduced or distrib-
uted in any form or by any means without prior consent in writing from
Innova AirTech Instruments A/S, Nærum, Denmark.
Trademarks
Windows95 and Accessare registered trademarks of Microsoft Corporation
Excelis a trademark of Microsoft Corporation

IV 1312 Photoacoustic Multi-gas Monitor
INNOVA
Instruction Manual

BE6002−11 1312 Photoacoustic Multi-gas Monitor 1−1
Instruction Manual
Chapter 1
Using this Manual

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Instruction Manual
Chapter 1−Using this Manual
Introduction
1.1 Introduction
This manual can be used in several ways. The first time users can work their way
through the examples in order to get to know this monitoring system. The more
experienced users can jump directly to the relevant chapters in order to gain assist-
ance, and experts can use this manual as a reference book by using the index.
When Offline operation is required, the normal instructions should be followed. If
there is a deviation from these instructions, this will be indicated in the relevant
sections.
1.2 Displaying Information
The information displayed on screen is presented in this manual as shown below:
➊Menu-bar option e.g. Edit
➋Pull-down menu option e.g. Open
➌Index-card e.g. ”Gas”
➍Group e.g. Gas Setup
➎Select Field e.g. Select S.I.T:
➏Check box: used to select several options
➐Soft-key e.g. Reload Filter Info.
Radio push-buttons: these are not illustrated above, but are commonly used in the
software. They act as a toggle function when several options are available, but only
one can be selected at a time.
1.3 Tool-bar Icons in 1312PC Software
The instructions in this manual use the pull-down menu paths to describe how
operations are possible. However, in many cases, the icons in the tool-bar can be
used to speed things up. The text below provides the key to the icons.
Create a new measurement task
Open an existing measurement task
Copy active window to clipboard
➏
➊
➋
➌
➍
➎
➐

Chapter 1−Using this Manual
Tool-bar Icons in 1312PC Software
BE6002−11 1312 Photoacoustic Multi-gas Monitor 1−3
Instruction Manual
Print active screen
Change sequence settings
Online only – Start a measurement sequence
Online only – Pause a measurement sequence
Online only – Stop a measurement sequence
Auto-scale axis from 0 to maximum value (only available when the
Autoscale OFF is selected in the windows properties dialogue)
Auto-scale axis from minimum to maximum values (only available
when the Autoscale OFF is selected in the windows properties dialogue)
Zoom in (only available when two cursors are selected)
Zoom out (only available when zoom is enabled)
Display the active window’s properties
Presentation only – Go to the start of the measurement task
Presentation only – Scroll backwards through the measurement task
Presentation only – Scroll forwards through the measurement task
Presentation only – Go to the end of the measurement task
Open the Cursor values dialogue
Online only – Open the Alarm status dialogue

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Chapter 1−Using this Manual
Tool-bar Icons in 1312PC Software

BE6002−11 1312 Photoacoustic Multi-gas Monitor 2−1
Instruction Manual
Chapter 2
Preliminary Tasks

2−21312 Photoacoustic Multi-gas Monitor
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Instruction Manual
Chapter 2−Preliminary Tasks
Installing the 1312PC Software
When taking delivery of the 1312 Photoacoustic Multi-gas Monitor, five very impor-
tant and necessary preliminary tasks must be completed before starting to operate
it:
●Install the 1312PC Software
●Connect the Monitor to a PC.
●Adjustment of the “Mains Voltage” selector.
●Check/Change the fuses in the monitor.
●Set the Communication Parameters.
2.1 Installing the 1312PC Software
Before installing the software, the PC must meet the following requirements:
The 1312PC software comes complete with an installation program. Insert the disk
labelled “1312PC Software Disk 1” and use the standard Windows95 procedure to
run SETUP.EXE.
If you are unsure how to install programs, refer to your Windows95 Help.
After the installation is successfully completed, five icons appear in the 1312PC
program menu. These are labelled:
●ONLINE
●PRESENTATION
●CALIBRATE
●OFFLINE
●DATABASE ADMINISTRATION
These icons can be placed on your desktop for easy access to the programs.
Hardware: A 486 (50MHz) co-processor or better
Min. 16Mbytes of RAM
Min. 40Mbytes of space available on the hard disk
VGA monitor or better
One RS–232 port
Mouse
Software: Windows95

Chapter 2−Preliminary Tasks
Connecting the Monitor to the PC
BE6002−11 1312 Photoacoustic Multi-gas Monitor 2−3
Instruction Manual
2.2 Connecting the Monitor to the PC
The monitor comes complete with a 9-pin to 25-pin null modem RS–232 interface
cable. If your PC has a 25-pin serial port, an adaptor can be fitted to enable the
supplied cable to be used.
2.2.1 Fitting the RS–232 Cable
1. Ensure that both the 1312 and the PC are switched off at the mains. Failure to
do so may result in your equipment being damaged.
2. Locate the serial port at the back of the PC, refer to your PC manual if in
doubt.
3. Push the connector on the RS–232 cable on to the serial port socket, and secure
it firmly using the securing screws.
4. Locate the output labelled “RS–232” at the back of the 1312.
5. Push the connector at the other end of the RS–232 cable on to this socket, and
secure it firmly using the securing screws.
If the mains voltage selector has been set, the instruments can be turned at the
mains now.
2.3 Adjusting the “Mains Voltage” Selector
The 1312 is able to operate in two different AC voltage ranges:
●100V–127V,and
●200–240V.
Before the 1312 is operated, the mains voltage selector (labelled “Mains Voltage”)
on the back panel of the 1312 (see Fig 2.1) must be adjusted to match the voltage of
the AC mains power supply being used.

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Chapter 2−Preliminary Tasks
Checking/changing the Fuses in the 1312
To set the voltage selector:
Insert a small screwdriver into the groove ➊
on the “Mains Voltage” selector and turn it so
that the white arrowhead ➋points towards ei-
ther:
●110 if the voltage of the AC mains voltage
supply to be used lies between 100 and 127 V;
or
●220 if the voltage of the AC mains voltage
supply to be used lies between 200 and 240V.
2.4 Checking/changing the Fuses in the 1312
The voltage-rating of the mains power supply determines the rating of the fuses
that need to be installed in the 1312 before it is used. This is done as follows:
1.Insert a small screwdriver under the top
edge of the plate covering the “AC Mains”
socket and use it to lever the plate down-
wards (see Fig 2.2).
2.Take out the fuse-holders (they each have a
small white arrow on them) and fuses. Check
that the installed fuses have the correct rat-
ing. The fuses used must be:
If the installed fuses do not have the correct rating, remove them from the fuse-
holders and install fuses which have the correct rating.
3. Turn the fuse-holders so that the arrows on them are pointing in the same
direction as the arrows on the inside surface of the plate covering the fuses in
the “AC Mains” socket, and slide the fuse-holders (with fuses) into position in
the 1312 (see Fig 2.3).
Supply
Voltage Fuse Ratings
100-127V Slow-blow (T) fuses with a
rating of 1.25A
200-240V Slow-blow (T) fuses with a
rating of 0.63A
Fig.2.1
The “Mains Voltage”
selector
➋
➊
Fig.2.2
The “AC Mains” socket

Chapter 2−Preliminary Tasks
Setting the Communication Parameters
BE6002−11 1312 Photoacoustic Multi-gas Monitor 2−5
Instruction Manual
4. Flip the top plate back and “click” it into position by pressing it gently against
the back panel of the 1312.
2.5 Setting the Communication Parameters
The 1312PC software and the monitor communicate using the RS–232 interface. In
order for the communication to be successful, it is essential that the communication
parameters in the two instruments are set correctly. This is a two stage process: the
PC communication port is selected via the 1312PC software while the baud rate,
parity, data bits and stop bits are defined via the monitor.
The communication parameters necessary for the monitor to communicate with the
1312PC software are shown below:
These values are set as the default values in the monitor.
To prevent communication errors, the text line terminator, print data log and print
error log must be set as shown below.
Baud rate 9600
Stop bits 1
Data bits 7
Parity Even
Hardwire mode Leased line
Handshake Type Hardwire
Fig.2.3 Taking out and putting back the fuse-holders

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Chapter 2−Preliminary Tasks
Setting the Communication Parameters
2.5.1 Selecting the PC Communication Port
It is just a simple case of selecting the correct port on the PC. The software offers
four to choose from: COM1, COM2, COM3 and COM4. If you are not sure which
port the cable is connected to on your computer, refer to you PC manual.
Start any one of the 1312PC software options: Online, Offline, or Calibrate.
1. Pull down the Task menu. Click on Communication. The Communication dia-
logue is displayed.
2. Click on the radio push-button next to the correct port name.
3. Click on OK to store the selection and exit this dialogue.
2.5.2 Checking/Changing the Communication Parameters
The communication parameters for the serial interface must be set using the push-
buttons on the front of the monitor. With the PC and the monitor already connect-
ed, as described in section 2.2:
1. Press
.
The screen display now shows the follow-
ing text.
2. If the baud rate displayed is incorrect, press and use and to display
the correct value. Press again to store your selection.
If the baud rate displayed is correct, then press to continue on to the next
parameter.
3. Press to select 1 STOP BIT.
4. Press to select 7 DATA BITS.
5. Press to select an EVEN PARITY.
6. Press to select LEASED-LINE.
7. Press to select HARD-WIRED HANDSHAKE.
Text line Terminator CR–LF
Print Data Log NO
Print Error Log NO
SET-UP S3 S1 S3
S1
SELECT BAUD RATE 9600
PRESS ENTER TO CHANGE VALUE
S1
S1
S2
S3
S3

Chapter 2−Preliminary Tasks
Setting the Communication Parameters
BE6002−11 1312 Photoacoustic Multi-gas Monitor 2−7
Instruction Manual
8. Press to exit the set-up mode.
9. Press and in order that the new settings are enabled.
The monitor and 1312PC software are now able to communicate together.
2.5.3 Checking/Changing the Text line Terminator
With the PC and the monitor already connected, as described in section 2.2:
Press
.
2.5.4 Checking/Changing the Data Log and Error Log Options
With the PC and the monitor already connected, as described in section 2.2:
Press .
SET-UP
RESET S1
SET-UP S2 S3
SET-UP S3 S1 S1 S3 S1 S1

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Chapter 2−Preliminary Tasks
Setting the Communication Parameters

BE6002−11 1312 Photoacoustic Multi-gas Monitor 3−1
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Chapter 3
Philosophy of Operation

3−21312 Photoacoustic Multi-gas Monitor
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Chapter 3−Philosophy of Operation
Online
3.1 Online
A monitoring system, where you use the PC environment to set-up the monitor
prior to measuring, display measurement data on the PC screen while monitoring
and store the measurement results directly on the PC’s hard disk. These results can
be used by other programs that use Open Database Connectivity (ODBC). The in-
structions for this mode of operation are covered in this manual under the PC Use
headings.
Using the online mode provides you with a variety of Alarm options. Not only are
the alarm trigger levels definable, but the action resulting from an alarm being
triggered can also be defined here. This enables you to connect external warning
systems to the monitoring system.
The philosophy behind the 1312PC software is common to almost all Windows95
programs. Access to the various levels of the program is gained by use of the
MENU BAR, PULL-DOWN MENUS, NEW WINDOW options and INDEX-CARD
separators. These familiar procedures, together with the simple software structure,
make the instructions in the Online sections of this manual understandable and
easy to implement.
If you are unsure of any of the commands used in the Online instructions, please
refer to section 1.2 of this manual or your Windows95 manual.
3.2 Offline
This method of operation enables you to set-up the monitor using the PC, down
load the setup to the monitor, and then disconnect the PC. The monitor is ready for
use as a stand-alone instrument. While monitoring, the monitor stores all the
measurement results in its internal memory. On completion of the monitoring task,
the PC and the monitor can then be connected again and the results uploaded to
the PC. These results can then be displayed on the PC screen, analysed and, if
necessary, are available to other software programs.
When Offline operation is required, the Online instructions in this manual should
be followed. If there is a deviation from these instructions, this will be indicated in
the relevant sections.

BE6002−11 1312 Photoacoustic Multi-gas Monitor 4−1
Instruction Manual
Chapter 4
Introduction to and Familiarization
with the 1312

4−21312 Photoacoustic Multi-gas Monitor
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Chapter 4−Introduction to and Familiarization with the 1312
Special Terminology
The 1312 is an extremely versatile measuring instrument, which can be used to
perform almost any kind of monitoring task. Its versatility may appear overwhelm-
ing at first, but to avoid such a reaction, we suggest that you read this chapter
thoroughly, and follow the practical exercises which are included. These exercises
give you a “guided tour” through a number of different practical procedures —
setting-up various parameters: environmental and measurement units; setting up a
monitoring task; performance of a monitoring task; scrolling through data collected
during a monitoring task, and finally, scrolling through data after completion of a
monitoring task. By following these different procedures the 1312’s operating phi-
losophy will become apparent and you will be able to quickly familiarize yourself
with its operation and control.
4.1 Special Terminology
Certain terms are used to describe the operation of the 1312 and it is necessary to
fully understand what these terms mean before you start any practical exercise
with the 1312.
4.1.1 Measurement Cycle
A description of a measurement cycle is given on page 2 of Product Data Sheet (see
boxed-in text and schematic diagram of the measurement system of the 1312).
“Measurement cycle” is the term used to describe everything that takes place in the
1312 from the time the pump starts to flush out the “old” gas sample in its analysis
cell, until the signal in the measurement chamber has been measured using the
last relevant optical filter.
The time taken to complete a measurement cycle is dependent upon the following
factors:
●How many gases/vapours are being measured — this affects the number of
optical filters which need to be used.
●The sample integration time selected — longer measurement times provide
greater accuracy.
●The Flushing times selected for the measurement chamber and the tube as
well as the length of the sampling tube attached to the 1312’s air-inlet — the
longer the tube, the more time is needed to flush it out between measurement
cycles.
●The cleanliness of the two air-filters which filter the air drawn into the cell
(this affects the pumping time required to draw a fresh air sample into the
analysis cell).
●The degree of fluctuation in the concentration of the various gases measured
in consecutive measurement cycles (this affects the time required to adjust
the gain of the amplifier attached to the microphones).