27904 Parallax Inc, 27904 Datasheet

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27904

Manufacturer Part Number
27904
Description
ALCOHOL BENZINE GAS SENSOR
Manufacturer
Parallax Inc
Datasheet
1.27931.pdf (6 pages)

Specifications of 27904

Lead Free Status / Rohs Status
Lead free / RoHS Compliant
CH4 (Methane) Gas Sensor Module (#27930)
CO (Carbon Monoxide) Gas Sensor Module (#27931)
LPG (Propane) Gas Sensor Module (#27932)
C2H5OH (Alcohol) Gas Sensor Module (#27904)
These Gas Sensor Modules are designed to allow a microcontroller to determine when a preset gas level
has been reached or exceeded. The type of gas detected depends on which module you are using.
27930 detects Methane (CH4), 27931 detects Carbon Monoxide (CO), 27932 detects Propane (LPG) and
27904 detects Alcohol (C2H5OH). Interfacing with these sensors is done through a 4-pin SIP header and
requires two I/O pins from the host microcontroller. The sensor modules are 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 these modules 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
Copyright © Parallax Inc.
Easy SIP header interface
Compatible with most microcontrollers
Low-power standby mode
Power requirements: 5 VDC @ ~165 mA
(heater on) / ~60 mA (heater off)
Interface: 1 TTL compatible input
(HSW), 1 TTL compatible output (ALR)
Operating temperature:
14 to 122 °F (-10 to 50°C)
Dimensions: 1.50 x 1.0 x 1.0 in
(38.1 x 25.4 x 25.4 mm)
Gas Sensor Modules (#27930, #27931, #27932, #27904)
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
Office: (916) 624-8333
Fax: (916) 624-8003
Sales: (888) 512-1024
Tech Support: (888) 997-8267
v2.2 8/2/2010 Page 1 of 6

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27904 Summary of contents

Page 1

... Methane (CH4), 27931 detects Carbon Monoxide (CO), 27932 detects Propane (LPG) and 27904 detects Alcohol (C2H5OH). Interfacing with these sensors is done through a 4-pin SIP header and requires two I/O pins from the host microcontroller. The sensor modules are intended to provide a means of comparing gas sources and being able to set an alarm limit when the source becomes excessive ...

Page 2

... Switching circuit for the Propeller chip. Note: HIGH signal is required to turn on heater due to inversion of signal by the transistor. Copyright © Parallax Inc. Gas Sensor Modules (#27930, #27931, #27932, #27904) v2.2 8/2/2010 Page chip, a 3.9 kΩ (10 kΩ could be used) resistor would be TM ...

Page 3

... The section below describes how to configure these gas sensor modules to detect gas with minimal calibration. Copyright © Parallax Inc. Gas Sensor Modules (#27930, #27931, #27932, #27904) v2.2 8/2/2010 Page Function Alarm output to host microcontroller Heat switch input from microcontroller, active low ...

Page 4

... Note: Temperature and humidity are factors that could affect the sensor, making calibration difficult. If this should happen try adjusting the voltages used in the calibration up or down as necessary to find a more stable range. Copyright © Parallax Inc. Gas Sensor Modules (#27930, #27931, #27932, #27904) v2.2 8/2/2010 Page Please note that turning the ...

Page 5

... Go to http://www.parallax.com, type the specific product number into our search box and click “GO.” For gas calibration information you can also visit the following PDF on this website: http://www.gotgas.com/pdf/GasSnsrCalibratn.pdf Copyright © Parallax Inc. Gas Sensor Modules (#27930, #27931, #27932, #27904) v2.2 8/2/2010 Page ...

Page 6

... DEBUG " ENDIF LOOP UNTIL index = 0 LOOP Copyright © Parallax Inc. Gas Sensor Modules (#27930, #27931, #27932, #27904) v2.2 8/2/2010 Page The sensor should run for at The DEBUG screen will count down the 60 seconds ' Heater Switch Control ' Alarm Input Sense ' Counter Variable ...

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