27929 Parallax Inc, 27929 Datasheet

27929

Manufacturer Part Number

27929

Description

Flow Sensors CO2 Gas Sensor Module

Manufacturer

Parallax Inc

Datasheet

1.27929.pdf (4 pages)

Specifications of 27929

Supply Voltage

6.5 V to 12 V

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current page: 1 of 4
Download datasheet (250Kb)

CO2 Gas Sensor Module (#27929)

The CO2 Gas Sensor Module is designed to allow a microcontroller to determine when a preset Carbon

Dioxide gas level has been reached or exceeded. Interfacing with this sensor is done through a 4-pin SIP

header and requires two I/O pins from the host microcontroller. The sensor module is intended to

provide a means of comparing gas sources and being able to set an alarm limit when the source becomes

excessive. Parallax does not provide gas calibration data on this module and such data as

well as the alarm settings are the responsibility of the user to define. For information on

calibration please see page 3.

Features

Key Specifications

Precautions

Be aware that the gas detected by this gas sensor can be deadly in high concentrations. 1%

(10,000 ppm) will make some people feel drowsy. Concentrations of 7% to 10% can cause

dizziness, headache, visual and hearing dysfunction and unconsciousness within a few

minutes to an hour. Always be careful to perform gas tests in well-ventilated areas.

THIS GAS SENSOR MODULE IS NOT DESIGNED FOR OR APPROVED FOR ANY APPLICATION INVOLVING

HEALTH OR HUMAN SAFETY. THIS GAS SENSOR MODULE IS FOR EXPERIMENTAL PURPOSES ONLY.

PARALLAX, INC. ABSOLVES ITSELF OF ALL LIABILITY AND RESPONSIBILITY ASSOCIATED WITH THE

CUSTOMER'S USE OF THIS GAS SENSOR MODULE AND IS NOT RESPONSIBLE FOR ANY BODILY INJURY,

DEATH OR PROPERTY DAMAGE AS A RESULT OF USING THIS GAS SENSOR MODULE.

IMPORTANT: CO2 SENSORS ARE POLARIZED. SENSORS FROM THE FACTORY HAVE A RED DOT ON

ONE SIDE. WHEN INSERTING THE SENSOR INTO THE SOCKET ON THE MODULE THE RED DOT MUST

BE TO THE LEFT IF YOU’RE LOOKING AT THE FRONT OF THE MODULE WITH THE PINS DOWN.

FAILURE TO FOLLOW THIS WILL CAUSE THE SENSOR TO MALFUNCTION AND PREVENT CALIBRATION.



Easy SIP header interface

Compatible with most microcontrollers

Low-power standby mode

Power requirements: 6.5 – 12 VDC @

~165 mA (heater on) / ~1.2 mA (heater

off)

Interface: 1 TTL compatible input

(CNTL), 1 TTL compatible output (ALR)

Operating temperature: 32°F to 158°F

(0°C to 70°C)

Dimensions: 1.50” x 1.00” x 1.00” (38.1

mm x 25.4 mm x 25.4 mm)

CO2 Gas Sensor Module (#27929)

Web Site: www.parallax.com

Forums: forums.parallax.com

Sales: sales@parallax.com

Technical: support@parallax.com

Application Ideas

Packing List



Gas level over-limit alarm

Stand-alone/background sensing device

Environmental monitoring equipment

Gas Sensor

Gas Sensor PCB Assembly

Potentiometer adjustment tool

v1.0 2/25/2010 Page 1 of 4

Office: (916) 624-8333

Fax: (916) 624-8003

Sales: (888) 512-1024

Tech Support: (888) 997-8267

Related parts for 27929

27929 Summary of contents

Page 1

... Stand-alone/background sensing device  Environmental monitoring equipment Packing List  Gas Sensor  Gas Sensor PCB Assembly  Potentiometer adjustment tool CO2 Gas Sensor Module (#27929) Office: (916) 624-8333 Fax: (916) 624-8003 Sales: (888) 512-1024 Tech Support: (888) 997-8267 v1.0 2/25/2010 Page ...

Page 2

... Alarm output to host microcontroller, active HIGH Input voltage Ground, connects to common ground Buffered output of sensor (buffer/amplifier) Ground, connects to common ground Trip Level voltage set by potentiometer (R3) Ground, connects to common ground CO2 Gas Sensor Module (#27929) Level 0V – 12VDC 0V / 3.3V +6.5 – 12VDC 0V 0V – 3.35V 0V 0V – ...

Page 3

... You may download the manufacturer datasheet, etc. from the gas sensor product page on our website by browsing to http://www.parallax.com Copyright © Parallax Inc. Your breath also contains moisture and potentially other and typing 27929 into our search box and clicking, “GO”. CO2 Gas Sensor Module (#27929) Please note that turning the v1.0 2/25/2010 Page ...

Page 4

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