PureAire Monitoring Systems Air Check User manual

Air Check Advantage
Carbonyl Sulfide Monitor
Instruction Manual
Part number 99156 (0-100ppm)
PureAire Monitoring Systems, Inc.
1140 Ensell Road
Lake Zurich, IL. 60047
Phone: [phone]
Fax: [phone]
Toll-Free: 888-788-8050
E-mail: [e-mail]
Web: Pureairemonitoring.com

PureAire Monitoring Systems, Inc.
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Welcome to Pure Aire Monitoring Systems
I’d like to thank you for investing in our continuous life safety and process control toxic gas
monitoring systems.
PureAire offers an unbeatable combination of experience and innovation in solving the safety
and environmental needs of our customers. We’re capable of providing small systems of a few
points to a total multi-point turnkey computerized package.
PureAire’s proprietary sensor cell technology and state-of-the-art electronics are designed to
interface with the latest distributive or PLC based control systems. We believe that our
experience, innovative products and commitment to service will satisfy your specific monitoring
needs now and in the future.
Our growth is a result of our total commitment to supporting our customers. We’re available 24
hours a day, 7 days a week to help you when you need us. Our 24 hour Emergency phone number is
847-420-3814. We can provide field service, preventative maintenance programs and training
to your technicians in the operation of our equipment. Our goal is to provide the best after sale
service and support in the industry. That’s just one way PureAire takes that extra step to
ensure your complete satisfaction.
Thank you again for investing in PureAire Monitoring Systems for your monitoring needs and
I’m proud to welcome you to our family of valued and satisfied customers.
Sincerely,
Albert A. Carrino
President

PureAire Monitoring Systems, Inc.
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Read Before Operating
This gas monitoring system has been designed to provide long-term reliable performance. We recommend the
following basic precautions while installing, operating and maintaining this device.
▪Read this “Guide to Operation and Installation” carefully. Installation, maintenance, calibration and testing
should be performed by qualified personnel only.
▪Check if the power supply matches the specifications given in this guide and ensure that the system has been
connected properly. This monitor must be powered by a regulated 24VDC power supply.
Please ensure the proper polarity. Reversing the polarity will damage the fuse on the drive PCB.
▪After power up, please let the system equilibrate for one hour before making any adjustments. Note
the monitor may read elevated concentrations of COS during the sensor warm up. Once the cell
recovers, the monitors zero may need to be adjusted.
▪The COS monitor is designed for safety monitoring where normal use is defined as zero gas concentration
with an occasional excursion. If the monitor is continuously exposed to carbonyl sulfide or if the monitor is
exposed to very high short-term gas concentrations, it will require more frequent gas calibration or complete
sensor cell replacement, and possible a new replacement pyrolizer filament .
▪The pyrolizer filament is fragile and must never be disturbed once inside the pyro tube. Never twist the
filament inside the pyro tube.
▪The COS sensor cell has a cross sensitivity to Isopropyl alcohol, (IPA). During wipe downs it is
recommended to disable the alarm outputs to your central alarm system.
This system has a built-in pyrolizer. The pyrolizer insulation temperature can reach
150 F and can cause burns if touched. Use Caution when working near the pyrolizer.

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Table of Contents
1: Introduction………………………………………………………… 4
1.1 Component Identification……………………………………… 5
2: Specifications.................................................................................... 10
2.1 Performance Specifications........................................................ 10
2.2 Gas Detection System................................................................ 10
2.3 Signal Outputs............................................................................ 11
2.4 Electrical Requirements............................................................. 11
2.5 Physical Characteristics............................................................. 11
2.6 Air Check Carbonyl Sulfide Default Settings............................ 12
3: Installation........................................................................................ 13
3.1 Site Requirements...................................................................... 13
3.2 Mounting.................................................................................... 13
3.3 Sensor Installation...................................................................... 13
3.4 Wiring........................................................................................ 13
3.5 Initial Startup ............................................................................. 14
4: Air Check Carbonyl Sulfide Programming................................... 16
4.1 Control Panel Overview............................................................. 16
4.2 Joystick Operation ..................................................................... 16
4.3 Program Flow Chart................................................................... 17
4.4 Entering the Password................................................................ 18
4.5 Changing the User Password..................................................... 19
4.6 Entering the Menus.................................................................... 22
5: Maintenance & Calibration ............................................................ 33
5.1 Routine Maintenance Schedule.................................................. 33
5.2 Loss of Power Indication........................................................... 33
5.3 Sensor Cell Removal and Installation........................................ 34
5.4 System Calibration..................................................................... 36
6: Appendix........................................................................................... 40
Rev 4.05 8/2019

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1: Introduction
The Air Check Carbonyl Sulfide Monitor is a compact extractive gas sampling system
designed for the continuous detection and measurement of toxic gas leaks. It is capable
of sampling over distances of up to 100 feet (33 meters).
The Air Check is a single point monitoring system built into a general purpose, Nema 2
housing that may be wall mounted. It’s designed to require as little space for installation
as possible.
The system has the following features:
▪24 VDC operation
▪Built-in pyrolizer
▪Integral digitally controlled sampling pump and flow system
▪Local digital display
▪User selectable dual level alarm and system fault relays
▪Visual dual level alarm and fault LED
▪4-20 mA output
▪Disposable electrochemical sensor cell
▪Supervised electronics monitors sensor, pyrolizer and sample pump
NOTE: The Air Check Carbonyl Sulfide enclosure is NOT rated for Class 1, Division 1
Groups B, C & D

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1.1 Component Identification
1.1.1 Overall System Composition
The Air Check Carbonyl Sulfide Monitor may be integrated into the overall hazardous gas
monitoring system. As a result, it may be remotely located for the monitoring of process areas and
other environments where access to the instrument for maintenance or service may be restricted. It
may also be used as a stand-alone detection system.
Front Cover—This permits accessing the inside of the sample and control system.
Mounting Tabs—Adjustable feet designed to connect the Carbonyl Sulfide enclosure to walls or
another solid surface. There is one on each corner of the enclosure.
Cover Fastening Screws—Captive Philips head plastic screws used to fasten the front cover to the
base of the Carbonyl Sulfide monitor. There is one on each corner of the front cover.
NOTE: Please do not over tighten the screws as the Phillips head will strip.
Cable Strain Relief —This is the opening in the transmitter housing for connecting the 4-20 mA
output, 24 VDC power cable, and alarm relay wiring.
Sample Inlet —This serves as the connection for the incoming sample line.
Sample exhaust —This serves as the connection for the sample exhaust line.
Cooling Fan —This fan pushes air into the case for cooling. It exhausts on the top right side of the
case
Cooling Fan
Cable Strain Relief
Front Cover
Cover fastening
screws
(on each corner)
Mounting Tabs
(on each corner)
Sample Exhaust
Sample Inlet

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1.1.2 Front View Control Panel
1. Local Digital Display —During normal operation, displays the name and
concentration of the target gas. Also displays alarm messages and
programming/calibration menus and information.
2. Joystick —Used for selecting and adjusting the built-in menus for alarm
threshold settings, relay state, alarm delay etc.
3. Alarm & Fault LED’s —These LED’s illuminate when a gas
concentration alarm or instrument fault is detected.
NOTE –The flow rate is factory set and is continuously regulated via a
built-in flow sensor. Flow rate is factory set for sampling distances
up to 100 feet. Field adjustment cannot be performed.
Local Digital
Display
Joystick
Alarm & Fault
(LED’s)
AL 2 , AL 1
& Fault

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1.1.3 Internal View
1. Main Power Connector —Connector for 24VDC power input. See section 3: Installation for
more information.
2. Pyrolizer Assembly —Converts Carbonyl Sulfide gas into Carbon monoxide gas prior to
presentation to the gas sensor.
CAUTION - The pyrolizer insulation temperature is above 150 F and can cause burns if touched
3. Pyro Filament Drive PCB —Controls power to the pyrolizer filament and signals the main
control electronics if a fault occurs.
4. Control Electronics and readout —Controls the sample pump, converts the signal from the
sensor cell and sends information to the local digital display and analog /relay terminal block.
NOTE –The flow rate is factory set and is continuously regulated via a built-in flow sensor.
5. Flow Chamber —The converted gas from the pyrolizer is introduced to the gas sensor in this
chamber. Sample flow into the chamber is continually monitored. If the sample pump fails, the
system fault relay is activated.
6. Carbonyl Sulfide Sensor Cell —A disposable electrochemical sensor cell. Typical life is 2 - 3
years under normal operating conditions.
7. Sample Pump —This internal sample pump is used to draw the gas sample from the area into
the pyrolizer and flow chamber.
8. Inlet & Exhaust —These are connections for the incoming gas sample and outgoing exhaust
sample
Main Power Connector
Pyro Filament Drive PCB
Pyrolizer Assembly
Control Electronics / Readout
Flow chamber
(located under the sensor cell)
Carbonyl Sulfide sensor cell
Sample Pump

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1.1.4 Transmitter Interior
1. Power / Analog Terminal Block —This terminal block is where the 24VDC power and
4-20 mA analog output connection is made.
1.1.5 Alarm Relay Board
1. Power / Analog
output Terminal Block
Fuse*
(Field replaceable)
Common
Common
mA output
+ 24 VDC
+ 24 VDC
Flow Sensor
Pump
Connector
Alarm Relay 2 Alarm Relay 1 Fault Relay
NC C NO NC C NO NC C NO
Remote
Reset
Sensor cell
connector
(terminated at the
factory)
*Fuse –A new fuse can be purchased directly from Digikey.com.
Their part number is F5689CT-ND

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Main power connection
(Terminated by PureAire or can
be terminated by the customer
when using their own power
supply)
Status LED’s
Green Power LED.
Confirms Power is being supplied to
the monitor.
Yellow Status LED.
Confirms the filament drive board is
operational.
Blue Fault Status LED.
Flashes to indicate various system
faults.
When not in fault the Blue LED
remains illuminated continuously
Pump and Pyrolizer Drive Assembly
Pyrolizer
Drive Board
Main 24VDC
Power
Connector
Sample
Pump
+ 24VDC Pin 6
Common Pin 5
NOTE: DO NOT Remove the shorting
pin connected to pins 5 and 4.