ACOEM Serinus 44 User manual

Serinus 44
NO/NO2/NOx/NH3
Analyser
Version 1.0

Ecotech Pty Ltd is now part of the Acoem Group and as such,
the branding of our instruments & software has also changed
to ‘Acoem’.
Over time we will be updating the content of all documents to
reflect the Acoem branding convention.
In the interim, please note that while the cover of this document
features Acoem branding, information contained within its
pages still utilises the original ‘Ecotech’ name.

Serinus 44 User manual 1.0 Front Matter
i
Manufacturers statement
Thank you for selecting the Acoem Serinus 44 NO/NO2/NOX/NH3Analyzer.
The Serinus series is the next generation of Acoem designed and manufactured gas
analyzer, the Serinus 44 will perform NO, NO2, NOX, NH3 measurements over a
range of 0-20ppm with a LDL of 0.4 ppb.
This User Manual provides a complete product description including operating
instructions, calibration, and maintenance requirements for the Serinus 44.
Reference should also be made to the relevant local standards, which should be used
in conjunction with this manual. Some relevant standards are listed in the References
section of this manual.
If, after reading this manual you have any questions or you are still unsure or unclear
on any part of the Serinus 44 then please do not hesitate to contact Acoem or your
local Acoem distributor.
Acoem also welcomes any improvements that you feel would make this a more
useable and helpful product then please send your suggestions to us here at Acoem.
Please help the environment and recycle the
pages of this manual when finished using it.
Notice
The information contained in this manual is subject to change without notice. Acoem
reserves the right to make changes to equipment construction, design, specifications
and /or procedures without notice.
Copyright © 2010 All rights reserved. Reproduction of this manual, in any form,
is prohibited without the written consent of Acoem Pty Ltd.

Front Matter Serinus 44 User manual 1.0
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WARNING
Hazardous voltages exist within the analyzer. The analyzer lid should be closed and
quarter turn lid fasteners locked when the analyzer is left unattended or turned on.
Ensure the power cord, plugs and sockets are maintained in a safe working condition.
Safety requirements
To reduce the risk of personal injury caused by electrical shock, follow all
safety notices and warnings in this documentation.
If the equipment is used for purposes not specified by Acoem, the protection
provided by this equipment may be impaired.
Replacement of any part should only be carried out by qualified personnel,
using only parts specified by Acoem as these parts meet stringent Acoem
quality assurance standards. Always disconnect power source before removing
or replacing any components.

Serinus 44 User manual 1.0 Front Matter
iii
Factory service/warranty
This product has been manufactured within an ISO9001/ISO 14001 accredited facility
with care and attention.
The product is subject to a 12-month warranty on parts and labour from date of
shipment (the warranty period). The warranty period commences when the product is
shipped from the factory. Lamps, fuses, batteries and consumable items are not
covered by this warranty.
Each analyzer is subjected to a vigorous testing procedure prior to despatch and will
be accompanied with a parameter list and a multipoint calibration check thereby
enabling the analyzer to be installed and ready for use without any further testing.
To ensure that we process your factory repairs and returned goods efficiently and
expeditiously, we need your help. Before you ship any equipment to our
factory, please call your local Acoem service response centre (or distributor) to
obtain a return authorisation number.
When you contact Acoem please provide the following information:
1. your name, telephone number and facsimile number
2. Your company name
3. The model number or a description of each item
4. The serial number of each item, if applicable
5. A description of the problem or the reason you are returning the equipment
(e.g. sales return, warranty return, calibration, etc)
If you are required to return the equipment, the following documents should also be
sent:
1. Your name, number and facsimile number
2. Your company name with return shipment
3. The model number or a description of each item
4. The serial number of each item, if applicable
A description of the problem/reason you are returning the equipment

Front Matter Serinus 44 User manual 1.0
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Claims for Damaged Shipments and
Shipping Discrepancies
Damaged shipments
1. Inspect all instruments thoroughly on receipt. Check materials in the
container(s) against the enclosed packing list. If the contents are damaged
and/or the instrument fails to operate properly, notify the carrier and Acoem
immediately.
2. The following documents are necessary to support claims:
a. Original freight bill and bill lading
b. Original invoice or photocopy of original invoice
c. Copy of packing list
d. Photographs of damaged equipment and container
e. Contact your freight forwarder for insurance claims
You may want to keep a copy of these documents for your records also.
Refer to the instrument name, model number, serial number, sales order
number, and your purchase order number on all claims. Upon receipt of a
claim, we will advice you of the disposition of your equipment for repair or
replacement.
Shipping Discrepancies
Check all containers against the packing list immediately on receipt. If a shortage
or other discrepancy is found, notify the carrier and Acoem immediately. We will not
be responsible for shortages against the packing list unless they are reported
promptly (within 7 days).

Serinus 44 User manual 1.0 Front Matter
v
Internationally recognised symbols used
on Acoem Equipment
Electrical fuse
IEC 60417, No. 5016
Earth (ground) terminal
IEC 417, No. 5017
Equipotentiality
IEC 417, No. 5021
Alternating current
IEC 417, No. 5032
Caution, hot surface
IEC 417, No. 5041
Caution, refer to
accompanying documents
ISO 3864, No. B.3.1
Caution, risk of electric shock
ISO 3864, No. B.3.6

Front Matter Serinus 44 User manual 1.0
vi
Manual Revision History
MAN 0075
M010034
1.0
August2010
Acoem Manual ID:
Manual PN:
Current Revision:
Date released:
Description: User Manual for the Serinus 44 NO/NO2/NOX/NH3
analyzer
This manual is the full user manual for the Serinus 44 NO/NO2/NOX/NH3Analyzer.
This manual contains all relevant information on theory, specifications, installation,
operation, maintenance and calibration. Any information that cannot be found within
this manual can be found by contacting Acoem at:
Email: Help [email protected]
Service [email protected]
Parts [email protected]
Phone: [phone]
Fax: [phone]
Address: Acoem Australasia
1492 Ferntree Gully Rd
Knoxfield Victoria
Australia 3180
Website www.acoem.com
Edition
Date
Summary
Pages
1.0
August 2010
Initial Release
all

Serinus 44 User manual 1.0 Front Matter
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Table of Contents
1INTRODUCTION ............................................................................................................ 1
1.1 DESCRIPTION ................................................................................................................... 1
1.2 SPECIFICATIONS .............................................................................................................. 1
1.2.1 MEASUREMENT ............................................................................................................. 1
1.2.2 PRECISION/ACCURACY .................................................................................................. 1
1.2.3 CALIBRATION ................................................................................................................ 1
1.2.4 POWER ........................................................................................................................... 2
1.2.5 OPERATING CONDITIONS ............................................................................................... 2
1.2.6 COMMUNICATIONS ........................................................................................................ 2
1.2.7 PHYSICAL DIMENSIONS .................................................................................................. 2
1.3 NOMENCLATURE ............................................................................................................. 3
1.4 BACKGROUND/ THEORY ................................................................................................. 4
1.4.1 MEASUREMENT THEORY ............................................................................................... 4
1.4.2 KALMAN FILTER THEORY .............................................................................................. 5
1.5 INSTRUMENT DESCRIPTION ............................................................................................ 5
1.5.1 PARTICULATE FILTER .................................................................................................... 6
1.5.2 DELAY LOOP .................................................................................................................. 6
1.5.3 MOLYCON CONVERTER ................................................................................................. 6
1.5.4 VALVE MANIFOLD ......................................................................................................... 6
1.5.5 SAMPLE VALVE MANIFOLD ........................................................................................... 6
1.5.6 PRESSURE TRANSDUCERS .............................................................................................. 6
1.5.7 HTO 1000N EXTERNAL THERMAL CONVERTER (OPTIONAL) ........................................ 6
1.5.8 OPTICAL CELL ............................................................................................................... 7
1.5.9 MAIN CONTROLLER PCB .............................................................................................. 7
1.5.10 POWER SUPPLY ............................................................................................................ 7
1.5.11 COMMUNICATIONS ...................................................................................................... 8
2INSTALLATION ............................................................................................................. 9
2.1 INITIAL CHECK ................................................................................................................ 9
2.2 MOUNTING/SITING ........................................................................................................ 10
2.3 INSTRUMENT SETUP ...................................................................................................... 10
2.3.1 PNEUMATIC CONNECTIONS .......................................................................................... 11
2.3.2 POWER CONNECTIONS ................................................................................................. 12
2.3.3 COMMUNICATIONS CONNECTIONS .............................................................................. 12
2.3.4 ANALYZER SET UP ....................................................................................................... 13
2.4 TRANSPORTING/STORAGE ............................................................................................ 14
3OPERATION.................................................................................................................. 15
3.1 WARMUP ........................................................................................................................ 15
3.2 GENERAL OPERATIONAL INFORMATION ..................................................................... 15
3.3 MAIN SCREEN ................................................................................................................ 16
3.4 SAMPLING ...................................................................................................................... 18
3.5 MENUS AND SCREENS .................................................................................................... 18
3.5.1 QUICK MENU ............................................................................................................... 19
3.5.2 ANALYZER STATE ....................................................................................................... 20

Front Matter Serinus 44 User manual 1.0
viii
3.5.3 MEASUREMENT SETTINGS ........................................................................................... 23
3.5.4 CALIBRATION MENU .................................................................................................... 24
3.5.5 SERVICE ....................................................................................................................... 26
3.5.6 COMMUNICATIONS ...................................................................................................... 32
4CALIBRATION ............................................................................................................. 35
4.1 ZERO CALIBRATION...................................................................................................... 35
4.2 SPAN CALIBRATION ...................................................................................................... 36
4.3 MULTIPOINT CALIBRATION ......................................................................................... 37
4.4 NO2 CONVERTER EFFICIENCY ..................................................................................... 39
4.5 NH3 CONVERTER EFFICIENCY ..................................................................................... 39
4.6 PRECISION CHECK ......................................................................................................... 40
4.7 PRESSURE CALIBRATION .............................................................................................. 41
5COMMUNICATION ..................................................................................................... 44
5.1 RS232 COMMUNICATION ............................................................................................. 44
5.2 USB COMMUNICATION ................................................................................................. 44
5.3 TCP/IP NETWORK COMMUNICATION ......................................................................... 44
5.4 DIGITAL/ANALOG COMMUNICATION .......................................................................... 46
5.5 SERINUS DOWNLOADER PROGRAM .............................................................................. 49
5.5.1 SETTINGS ..................................................................................................................... 49
5.5.2 DATA ........................................................................................................................... 51
5.5.3 REMOTE SCREEN .......................................................................................................... 52
5.5.4 REMOTE TERMINAL ..................................................................................................... 53
6SERVICE ........................................................................................................................ 54
6.1 PNEUMATIC DIAGRAM .................................................................................................. 54
6.2 MAINTENANCE TOOLS .................................................................................................. 54
6.3 RECOMMENDED MAINTENANCE SCHEDULE ................................................................ 55
6.4 MAINTENANCE PROCEDURES ....................................................................................... 56
6.4.1 PARTICULATE FILTER REPLACEMENT .......................................................................... 56
6.4.2 CLEAN FAN FILTER ...................................................................................................... 57
6.4.3 DFU REPLACEMENT .................................................................................................... 57
6.4.4 SINTERED FILTER REPLACEMENT ................................................................................ 57
6.4.5 QUICK LEAK TEST ........................................................................................................ 58
6.4.6 ADVANCED LEAK CHECK ............................................................................................. 59
6.4.7 REPLACE PMT DESICCANT PACKS............................................................................... 59
6.4.8 CLEAN REACTION CELL ............................................................................................... 60
6.4.9 PRESSURE SENSOR CHECK ........................................................................................... 61
6.5 PARTS LIST ..................................................................................................................... 61
6.6 UPDATING FIRMWARE .................................................................................................. 62
7TROUBLESHOOTING ................................................................................................ 63
7.1 ZERO FLOW ................................................................................................................... 64
7.2 ELECTRONIC ZERO ADJUST.......................................................................................... 64
7.3 NOISY READINGS ........................................................................................................... 65
7.4 CONVERTER TEMPERATURE FAILURE ......................................................................... 65

Serinus 44 User manual 1.0 Front Matter
ix
7.5 FLOW BLOCK TEMPERATURE FAILURE ....................................................................... 66
7.6 REACTION CELL TEMPERATURE FAILURE .................................................................. 67
8OPTIONAL EXTRAS ................................................................................................... 69
8.1 RACK MOUNT KIT .......................................................................................................... 69
8.2 PRESSURISED ZERO/SPAN VALVE ................................................................................. 71
8.2.1 SINGLE PRESSURIZED CALIBRATION OPTION ............................................................... 71
8.2.2 DUAL PRESSURIZED CALIBRATION OPTION ................................................................. 72
APPENDIX A ADVANCED PROTOCOL PARAMETER LIST ..................................... 75
APPENDIX B –EC9800 PROTOCOL .............................................................................. 81
APPENDIX C –BAVARIAN PROTOCOL ....................................................................... 83
APPENDIX C –PNEUMATIC DIAGRAM .......................................................................... 2

Front Matter Serinus 44 User manual 1.0
x
List of Figures
Figure 1 Simple pneumatic diagram.......................................................................................... 4
Figure 2 Internal components diagram...................................................................................... 5
Figure 3 Opening the lid ............................................................................................................ 9
Figure 4 Instrument Back panel............................................................................................... 10
Figure 5 Switching battery off.................................................................................................. 14
Figure 6 Serinus front panel .................................................................................................... 15
Figure 7 Excel graph of Multipoint Calibration......................................................................... 38
Figure 8 Ozone generator cable.............................................................................................. 41
Figure 9 Blocking exhaust T-piece.......................................................................................... 41
Figure 10 Position of Barometer placement (valve manifold) ................................................. 42
Figure 11 Pressure menu........................................................................................................ 42
Figure 12 Communication ports .............................................................................................. 44
Figure 13 Device Installer pop up window............................................................................... 45
Figure 14 Device Installer XPort-03......................................................................................... 45
Figure 15 Device Installer - Telnet Configuration.................................................................... 45
Figure 16 Serinus 25 pin microprocessor board (with default jumpers highlighted) ............... 47
Figure 17 External 25pin I/O individual pin descriptions ......................................................... 48
Figure 18 Serinus downloader - settings tab........................................................................... 50
Figure 19 Serinus Downloader –Data tab .............................................................................. 51
Figure 20 Serinus Downloader –Remote Screen tab............................................................. 52
Figure 21 Serinus downloader - Remote Terminal tab............................................................ 53
Figure 22 Pneumatic diagram ................................................................................................. 54
Figure 23 Removing plunger ................................................................................................... 56
Figure 24 Removing fan filter .................................................................................................. 57
Figure 25 Measurement cell T-piece....................................................................................... 57
Figure 26 Plugged sample and calibration ports..................................................................... 58
Figure 27 Opening the Reaction cell or PMT access cap....................................................... 59
Figure 28 Optical filter removal and cleaning.......................................................................... 60
Figure 30 Installation of lid to rack mount brackets................................................................. 69
Figure 32 Single high pressure calibration option ................................................................... 72
Figure 33 Dual high pressure calibration option...................................................................... 73
List of Tables
Table 1 Maintenance schedule................................................................................................ 55
Table 2 Parts List..................................................................................................................... 61
Table 3 Troubleshoot list ......................................................................................................... 63
Table 4 Noisy readings troubleshoot....................................................................................... 65
Table 5 Advanced Protocol Parameter list.............................................................................. 75
List of Equations
Equation 1 Chemilluminescence reaction ................................................................................. 4
Equation 2 NO2calculation........................................................................................................ 5
Equation 3 Instrument accuracy.............................................................................................. 37
Equation 4 Calculation for converter efficiency ....................................................................... 39
Equation 5 Calculation for NH3converter efficiency................................................................ 39

Serinus 44 User manual 1.0 Introduction
1
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1.1 Description
The Serinus 44 NO/NO2/NOX/NH3 analyzer uses gas phase chemilluminescence
detection to perform continuous analysis of nitric oxide (NO), total oxides of nitrogen
(NOx), nitrogen dioxide (NO2) and ammonia (NH3). The Serinus 44 analyzer
measures to a sensitivity of 0.4ppb in the range of 0-20ppm. The measurement of
these three gases is performed with the following main sub-components:
NO2 to NO converter
Delay coil (NOX channel)
External Ammonia converter
Ozone source with reaction chamber (NO + O3)
Photomultiplier Tube (PMT)
Calculation of NO2 and NH3 from NO/NOX/NX
The concentrations are automatically corrected for gas temperature and pressure
changes and referenced to 0°C, 20°C or 25°C at 1 atmosphere. This allows the
Serinus 44 to sample in the most useful measurement range for NO, NO2 NOX and
NH3. This Manual will detail the operation, preventive maintenance, cautions and
health warnings.
1.2 Specifications
1.2.1 Measurement
Range:
0-50ppb, 0-20ppm auto ranging
Lower detectable limit:
0.4 ppb
1.2.2 Precision/Accuracy
Precision:
0.4 ppb or 0.5% of reading, whichever is greater.
Linearity:
<1% of full scale
Response time:
15 seconds to 95%
Sample flow rate:
0.3 SLPM (1.0 SLPM total flow for all channels).
1.2.3 Calibration
Zero drift
Temperature dependant: 0.1ppb per °C
24 hours: < 0.5 ppb
7 days: < 0.5 ppb

Introduction Serinus 44 User manual 1.0
2
Span drift
Temperature dependant: 0.1% per °C
7 days: <1% of reading
1.2.4 Power
Operating voltage:
99 to 132 VAC (57-63Hz) or via switch 198 to 264 VAC (47 to 53 Hz)
1.2.5 Operating conditions
Ambient Temperature Range:
5ºC to 40 ºC (41 ºF to 104 ºF)
Sample pressure dependance:
5% change in pressure produces less than a 1% change in reading
1.2.6 Communications
Analog Output
Menu selectable current output of 0-20 mA, 2-20mA or 4-20 mA
or
Voltage output of 0 to 5 V, with menu selectable zero offset of 0%, 5%, or
10%.
Range: 0 to full scale from 0-0.05 ppm to 0-20 ppm with 0%, 5%, and 10%
offset.
Digital Output
RS232 port #1: Normal digital communication or termination panel
connections
RS232 port #2: Multidrop port used for multiple analyzer connections
on a single RS232
USB port connection on rear panel
25 pin connector with discrete status and user control
USB stick memory (front panel) for data logging, event logging and parameter
storage
1.2.7 Physical dimensions
Case dimensions:
Length: 620mm without handle (24.4” inches)
Width: 440mm (17.3” inches)
Height: 178mm/4RU (7” inches)
Weight: 22.6 kg (Analyzer)
10kg (Converter)

Serinus 44 User manual 1.0 Introduction
3
1.3 Nomenclature
Span: A gas sample of known composition and concentration used to
calibrate/check the upper range of the instrument (GPT using NO gas).
Zero: Zero calibration uses zero air (NOX/NH3 scrubbed ambient air)
to calibrate/check the lower range of the instrument.
Background: External signals that can be confused with that of the
signal being measured.
Zero drift: the change in instrument response to zero pollutant
concentration over 12hr and 24hr periods of continuous unadjusted
operation.
Zero air: Purified air in which the combined effect of the
concentration of impurities is less than 1% of the relevant midrange of
the analyzer instrument. Sufficient purified air can be obtained by
passing dry ambient air through an activated charcoal filter and a
particulate filter.
External span source: Span gas that is delivered via an external
accredited cylinder (e.g. NATA/NIST).
Sample Air: Sample air is defined as the sample before it has entered
the reaction cell, as distinguished from the exhaust air.
Exhaust air: Exhaust air is the sample air after it has passed through
the reaction/measurement/detection cell and is moving towards being
expelled from the analyzer.
ID and OD: Measurements of tubing, ID is the internal diameter of
tubing, OD is the outer diameter.

Introduction Serinus 44 User manual 1.0
4
1.4 Background/ Theory
Oxides of Nitrogen (NOx) is the product of endothermic reactions within combustion
engines and causes significant environmental pollution.
The main source of NOx is from the engine of automobiles and these pollutants are
harmful to humans in their respective forms or in the creation of ozone (O3) or acid
rain. NOx is most prevalent in our societies as a contributor to asthmatic conditions as
well as the smog found throughout many industrialized cities.
Ammonia (NH3) is mainly generated from agricultural sources, with hot-spots found
particularly near intensive pig and poultry farms. Ammonia pollution causes both
acidification of soils and a decrease in the richness of plant species.
1.4.1 Measurement Theory
The measurement of the NO/NO2/NOX/NH3 is performed via the gas phase
chemiluminescence method. The Serinus 44 follows these principles and
measurement techniques:
Sample air is drawn into the reaction cell via three separate (alternating)
channels the NO, NOX and NX. The NOX channel travels through a delay coil
enabling the same sample of air to be sampled for NO, NO2 and NOX.
The NOX channel passes through an NO2 to NO converter, NO2 is converted
to NO
The analyzer also draws in air through an external converter (NX channel)
which converts NH3 into NO (and some NO into NO2). This is then passed
through the molyconverter to convert any NO2 into NO.
Figure 1 Simple pneumatic diagram
Sample air (NO, NOX and NX channels) enter the measurement cell where NO
reacts with Ozone in the following reaction
NO + O3  NO2* + O2
Equation 1 Chemilluminescence reaction
This reaction releases energy in the form of chemiluminescence radiation
(1100nm), which is filtered by the optical bandpass filter and detected by the
photomultiplier tube (PMT)

Serinus 44 User manual 1.0 Introduction
5
The level of chemiluminescence detected is directly proportionally to the NO
in sample
NO2 is calculated by subtracting the NO measurement from NOX
measurement
NOX = NO + NO2 or NO2 = NOX – NO
Equation 2 NO2 calculation
1.4.2 Kalman filter theory
The Serinus analyzer series use the advanced digital Kalman filter. This filter
provides the best possible compromise between response time and noise reduction for
the type of signal and noise present in ambient air analyzers.
The Kalman filter enhances measurements by modifying the filter time base variable,
depending on the change rate of the measured value. If the signal rate is changing
rapidly, the instrument is allowed to respond quickly. When the signal is steady, a
long integration time is used to reduce noise. The system continuously analyzes the
signal and uses the appropriate filtering time.
1.5 Instrument description
The NO/NO2/NOX/NH3 analyzer consists of six main assemblies:
The pneumatics to transfer sample and exhaust gas
The sensors for the measurement of NO/NO2/NOX/NH3 (optical cell) and
other relevant parameters
The control system which encompasses all circuit boards controlling sensors
and pneumatics
The power supply which supplies power for all the instrument processes
The Communication module to access data
External thermal converter
Figure 2 Internal components diagram

Introduction Serinus 44 User manual 1.0
6
1.5.1 Particulate filter
The Particulate filter is a Teflon 5 micron (µm) filter with a diameter
of 47mm. This filter eliminates all particles larger than 5µm that could
interfere with sample measurement. There are two particulate filters
fitted within the analyser one on the NO/NOx line and the other on the
Nx line.
1.5.2 Delay Loop
The delay loop is a coil of sample tubing which increases the length of
time sample air takes to travel to the NO2-NO converter and the
measurement chamber. This delay allows the sample from the NO
channel to be measured before the sample from the NOx channel
arrives there.
1.5.3 Molycon Converter
The molycon converter uses high temperatures (325ºC) and
Molybdenum chips to convert any NO2 in the sample to NO. This
conversion is used for NOX measurements as well as the calculation of
NO2.
The molybdenum converter assembly also houses a catalytic ozone
destroyer that removes ozone from the instrument exhaust.
1.5.4 Valve Manifold
The valve manifold switches between sample gas, calibration and
background gas.
1.5.5 Sample Valve Manifold
The sample valve manifold switches sample gas between NO, NOX
and NX channels along with background and bypass flow.
1.5.6 Pressure Transducers
Two pressure transducers are used for the calculation of sample flow
rate, one is located upstream to the critical orifices (ambient) and the
other is located in the reaction cell downstream of the critical orifice
(gas pressure).
1.5.7 HTO 1000N external thermal converter (optional)
The HTO 1000N thermal oxidizer employs both catalytic and thermal
principles in the conversion of NH3 to NO. Converter efficiency is
between 88-94% at a temperature of 680°C.
The HTO 1000N is connected to the Serinus 44 analyzer through the
Auxiliary port (on the rear of the analyzer, see section 2.3.1 for more
details).

Serinus 44 User manual 1.0 Introduction
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1.5.8 Optical Cell
Reaction Cell
The reaction cell is designed to inject ozone into the sample, causing a
chemiluminescence reaction which emits radiation of which some is
filtered to a specific wavelength (1100nm) and measured by the PMT.
The cell is designed to optimize the signal detected by the PMT and
reduce noise.
Optical Bandpass Filter
The optical bandpass filter is a coloured glass that only allows light of
600nm through
Photomultiplier (PMT)
The PMT detects the amount of light reaching its sensors. The filtering
of light reaching the PMT allows direct measurement of NO in the cell.
PMT Cooler
To reduce the noise of the PMT, the PMT is operated within a constant
temperature of 12°C by the PMT cooler
PMT High Voltage Supply and Preamplifier module
This is a single component within the PMT housing. Its function is to
supply high voltage to the PMT and to amplify the photocurrent signal
from the PMT.
1.5.9 Main Controller PCB
The Main Controller PCB controls all the processes within the
instrument, it contains a battery backed clock/calendar and an onboard
microprocessor. The Main Controller PCB is located at the top of the
instrument, above the rest of the components when the lid is removed.
The PCB is hinged and can be lifted up to stand up vertically allowing
easy access to instrument components underneath.
1.5.10 Power supply
The power supply is a self-contained unit housed in a steel case
designed to meet CE requirements.
It has an input voltage of 115/230VAC 50/60 Hz and an output voltage
of 12 VDC power for distribution within the analyzer.
Note: Input voltage can be manually changed
by flicking the red switch left (230) for 220-
240V or right (110) for the 100-120V. Ensure
the switch is set to the correct voltage (from
supply) before switching on.
On/off switch
Located on the back panel (bottom right facing from behind the
instrument)

Introduction Serinus 44 User manual 1.0
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1.5.11 Communications
Communication between the analyzer and either a data logger, laptop
or network can be performed with the following communication
connections located on the back panel (see Figure 4).
RS232 #1
This port is designed to be used for simple RS232 communication or
with a Termination Panel allowing the Serinus instrument to work as a
datalogger. This function is an optional extra that can be
purchased from Acoem.
RS232 #2
This port is designed to be used for simple RS232 communication, or
in a daisy chain (multidrop) configuration (multiple analyzers
connected via the same RS232 cable).
USB
This port can be used for instrument communication and is also good
for quickly downloading data, onsite diagnostics, maintenance and
firmware upgrades.
TCP/IP (optional)
This port is best used for remote access and real-time access to
instruments when a network is available to connect with.
External I/O port
The Analog/Digital port sends and receives analog/digital signals to
other devices. These signals are commonly used to activate gas
calibrators or for warning alarms.
Analog Outputs
The analyzer is equipped with three analog outputs. Menu
selectable as either voltage ouput 0-5VDC, or current output 0-
20, 2-20, 4-20 mA
Analog Inputs
The Analyzer is also equipped with three analog voltage inputs
(0-5VDC) with resolution of 15 bits plus polarity.
Warning: Exceeding these voltages can permanently
damage the instruments and void warranty
Digital Status Inputs
The analyzer is equipped with 8 logic level inputs for the external
control of Zero/Span calibration sequences.
Digital Status Outputs
The analyzer is equipped with 8 open collector outputs which
will convey instrument status conditions and warning alarms
such as no flow, sample mode, etc.