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PDF AS-MLV-P2 Data sheet ( Hoja de datos )

Número de pieza AS-MLV-P2
Descripción Air Quality Sensor
Fabricantes ams 
Logotipo ams Logotipo



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AS-MLV-P2
Air Quality Sensor
General Description
The ams AS-MLV-P2 is a MOS (metal oxide semiconductor)
based gas sensor component. It was specifically designed for a
broad detection of reducing gases such as VOCs (volatile
organic compounds) and CO (carbon monoxide) associated
with bad air quality. The AS-MLV-P2 sensor component is a
MEMS (micro electromechanical system) device using silicon
wafer technology.
Ordering Information and Content Guide appear at end of
datasheet.
Key Benefits & Features
The benefits and features of AS-MLV-P2, Air Quality Sensor are
listed below:
Figure 1:
Added Value of Using AS-MLV-P2 Sensor
Benefits
High sensitivity to volatile organic compounds (VOCs)
Very low power consumption
Maintenance free
Reflow capable
Features
Limit of detection in a low ppm range
34 mW at 300°C
10 year lifetime
Surface Mount Package
Applications
Indoor air monitor
Kitchen hood
Weather stations
Smart home
Internet of Things (IoT)
ams Datasheet
[v1-01] 2015-Oct-12
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AS-MLV-P2 pdf
AS-MLV-P2 − Detailed Description
Detailed Description
Figure 6:
Sensor Sensitivity
10
1
AS-MLV-P2 heater and inter-digital electrode structures use
Platinum and are implemented in an approximately one
micrometer-thin silicon nitride membrane to achieve ultimate
stability and lowest possible power consumption. A highly
sensitive and long-term stable polycrystalline tin
dioxide-based sensitive material is deposited on the
inter-digital electrodes. At an elevated operation temperature
of approx. 300°C, this catalytically active material shows a gas
concentration dependent resistance change.
Sensing Properties
The AS-MLV-P2 sensor component shows a strong sensitivity to
a wide range of reducing gases as can be seen in Figure 6. Please
note that those results may vary due to different environmental
conditions.
CO
butane
methane
ethanol
hydrogen
0,1
0,01
10
100 1000
Gas Concentration (ppm)
10000
Sensor Sensitivity: Sensitivities for various gas concentrations, this graph shall just give an indication and can
vary slightly from sensor to sensor.
ams Datasheet
[v1-01] 2015-Oct-12
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AS-MLV-P2 arduino
AS-MLV-P2 − Application Information
Heater Calibration
As mentioned in the previous chapter the each sensor has its
own set-point at the operation temperature. This set-point can
be determined by a previous calibration step. This means that
the AS-MLV-P2 is started at room temperature (23°C ± 3°C) and
powered with 34mW. With these conditions the heater
resistance is measured and stored into the EEPROM. This heater
resistance is the certain set-point which is kept constant with
the regulating PWM during operation.
Figure 12:
Burn-In of Sensor
General Characteristics
The sensor has some native characteristics which should be
considered in the application development.
Burn-In Behavior
Once in lifetime the sensor performs a special burn in behavior,
this curve is characterized in three phases which are described
with the following figure.
Phase 1
Phase 2
Phase 3
Description
Fast increase of the sensor resistance
Plateau with nearly stable baseline
Long drift like decrease of the sensor resistance
Duration
~ 10 hours
~ 12 hours
> 4 days
ams Datasheet
[v1-01] 2015-Oct-12
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