PureAire Air Check Lite User manual

Air CheckLite
Toxic Gas Monitor
Instruction Manual
PureAire Monitoring Systems, Inc.
1140 Ensell Road
Lake Zurich, Illinois 60047
Phone: [phone]
Fax: [phone]
Toll-Free: 888-788-8050
www.pureairemonitoring.com

Welcome to PureAire 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 digital 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 1-847-420-3814. 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

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Table of Contents
1: Introduction......................................................................................................................2
1.1 Key Features ........................................................................2
1.2 Component identification.....................................................3
2: Specifications...................................................................................................................6
2.1 Performance Specifications .................................................7
2.2 Gas Detection System..........................................................7
2.3 Signal Outputs......................................................................7
2.4 Electrical Requirements.......................................................7
2.5 Physical Characteristics.......................................................8
3: Installation .......................................................................................................................9
3.1 Site Requirements................................................................9
3.2 Mounting..............................................................................9
3.3 Sensor Installation..............................................................10
3.4 Wiring................................................................................11
3.5 Initial Startup .....................................................................11
4: Normal Operation..........................................................................................................12
4.1 Signal Outputs....................................................................12
4.2 Instrument Faults ...............................................................12
4.3 Routine Maintenance Schedule..........................................12
4.4 Loss of Power Indicator.....................................................13
5: Maintenance & Calibration............................................................................................14
5.1 Sensor Cell Removal and Installation................................14
5.2 Electrolyte Replacement....................................................15
5.3 Sensor Calibration..............................................................19
6: Drawings........................................................................................................................24
7: Appendix........................................................................................................................29

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1: Introduction
The Air Check Lite Toxic Gas Monitoring System is a self-contained gas detection system
suitable for keeping a wide range hazardous gases under continual surveillance. Each system
consists of an amperometric, electrochemical sensor cell and two-wire transmitter. The Air
Check Lite Monitoring System may be used as a stand-alone gas detector, linked to an
optional controller (RX-1G), or connected to your own centralized control and surveillance
system.
This manual covers the installation, operation, and maintenance of the
Air Check Lite Monitoring System for the following gases:
Ammonia (NH3) 0 to 75 ppm
Arsine (AsH3) 0 to 1 ppm
Boron Trichloride (BCl3) 0 to 9 ppm
Carbon Monoxide (CO) 0 to 100 ppm
Chlorine (Cl2) 0 to 3 ppm
Diborane (B2H6) 0 to 1 ppm
Fluorine (F2) 0 to 1 ppm
Hydrogen (H2) 0 to 4% vol
Hydrogen Bromide (HBr) 0 to 9 ppm
Hydrogen Chloride (HCl) 0 to 15 ppm
Hydrogen Fluoride (HF) 0 to 9 ppm
Hydrogen Sulfide (H2S) 0 to 30 ppm
Nitric Oxide (NO) 0 to 100 ppm
Nitrogen Dioxide (NO2) 0 to 9 ppm
Oxygen Deficiency (O2) 0 to 25%
Phosphine (PH3) 0 to 1 ppm
Silane (SiH4) 0 to 15 ppm
1.1 Key Features
The Air Check Lite Monitoring System incorporates a number of user-friendly features
designed to simplify installation, operation, and maintenance.
1.1.1 Plug-in Sensor
The system’s renewable, electrochemical sensor features a special plug-in design to simplify
sensor installation and removal.
1.1.2 Smart Electronics
The sensor cell also incorporates a special electronic circuit which permits “ex-situ” calibration.
This smart circuitry also alerts the user to low electrolyte, sensor faults, and other problems
which may interrupt surveillance.

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1.2 Component Identification
1.2.1 Front View Exterior
1. 4-20 mA Signal Output Terminal —This connection serves as both
the
4-20 mA output connection and 24 VDC power input connection. See
section 3: Installation for more information.
2. Sensor Cable and Connector —Allows remote mounting of sensor.
Sensor plugs into receptacle on end of sensor cable.
3. Sensor Cover —This cover protects the gas sensor. It threads onto
the upper portion of the sensor.
4. Gas Sensor —An amperometric, electrochemical sensor which
detects and measures the target gas. Different gas sensors are required
to detect different gases. When exposed to the target gas, the sensor
outputs an electrical signal proportional to the gas concentration.
5. Cable Port —This is the opening in the transmitter housing for
connecting the 4-20 mA output and 24 VDC power cable.
6. Transmitter Cover —A removable cover that protects the interior of
the transmitter.
7. Transmitter Cover Fasteners —These captive screws secure the
transmitter cover in place.
1.
2.
6.
3. & 4.
5.
7.

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1.2.2 Transmitter Interior
1. Calibration Port —This port is used for when calibrating Air Check
Lite Monitoring Systems which do not have a digital display. See
Sensor Calibration elsewhere in this manual.
2. Terminal Block —This terminal block is where the VDC
power/analog output connection is made.
3. Sensor Cell Terminal Block —This terminal block is where the
sensor cell cable output connection is made.
1.2.3 Electrochemical Sensor
1. Span Potentiometer —This potentiometer is used to adjust the
sensitivity of the sensor cell. It should only be adjusted when
calibrating the instrument.
2. Zero Potentiometer —This potentiometer is used to adjust the
instrument’s
4 mA analog output signal to ensure that it is transmitting a 4 mA
signal when the instrument is reading a zero concentration.
3. Shorting Plug —The sensor is shipped with a jumper (shorting plug)
in place. This plug should be removed prior to sensor installation and
replaced whenever the sensor is removed for extended periods of time
(storage, etc.).
1. Span Potentiometer
2. Zero Potentiometer
3. Shorting Plug
1. Calibration Port
2. Terminal Block
3. Sensor cell
Terminal Block

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4. Sensor Connector —Female connector; plugs into receptacle on
sensor cable.
5. Threads for Sensor Cover —Secure sensor cover onto sensor body.
4. Sensor Connector
5. Threads for Sensor
Cover

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6. Sensor Cable and Connector —Allows remote mounting of sensor.
Sensor plugs into receptacle on end of sensor cable.
7. Sensor Cover —This cover protects the gas sensor. It threads onto
the upper portion of the sensor body.
6. Sensor Cable and
Connector
7. Sensor Cover

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2: Specifications
NOTE: Due to our commitment to continual product improvement, all
specifications are subject to change without notice.
2.1 Performance Specifications
Sensor Type: Plug-in diffusion type electrochemical cell.
Response Time: Within 30 seconds to T90.
Repeatability: ±10% of full scale.
Fault Indicators: Loss of VDC power (analog signal drops to 0 mA).
Low electrolyte (analog signal drops to 2 mA; 0 mA on request).
Sensor removed (analog signal drops to 2 mA; 0 mA on request).
Operating Temperature:14° to 113°F (-10° to +45°C); consult PureAire for lower operating temperatures.
Humidity: Sensor dependent; typically 20 to 95% RH; consult PureAire for sensors which
can operate in 100% condensing RH environments.
2.2 Gas Detection System
Type: Renewable GS-DQS electrochemical gas sensor.
Sensor Life: 4 to 5 years under normal conditions.
Detectable Gases: See Appendix for gases, measuring ranges, and sensor part numbers.
2.3 Signal Outputs
Analog Output: DC 4-20 mA
2.4 Electrical Requirements
Power: 24 VDC external power.
Consumption: Approximately 100mA

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2.5 Physical Characteristics
Dimensions: 4.9 (W) x 3 (H) x 3 (D) inches;
125 x 75 x 75 mm
Weight: 1.1 pounds (0.5 kg)
Enclosure Type: General purpose; not intended for explosive atmospheres.
Installation Options: Bulkhead fittings for remote sensor installation.