MQ-138 Formaldehyde aldehydes gas sensor module for Arduino, Raspberry Pi and MCU

Be the first to review this product

The MQ-138 Formaldehyde aldehydes gas sensor module has high sensitivity to Toluene, Methanol, Alcohol, Acetone and Formaldehyde and it was created specifically for Arduino, Raspberry Pi and easy to implement in various MCU.

Continue >>

Availability: In stock

Excl. Tax: €45.72 Incl. Tax: €55.78

Product Description

Details

Sensitive material of MQ-138 gas sensor is SnO2, which with lower conductivity in clean air. When the Formaldehyde Aldehydes gas exists, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit. It responses directly to organic interference gases.
 
Technical specification:
Detection range:
• Toluene 10-100ppm
• Methanol 5-100ppm
• Alcohol 30-300ppm
• Acetone 10-300ppm
• Formaldehyde 1-10ppm

Working voltage: 5.0V±0.2V AC or DC
• with the signal light indicates the output
• the dual signal output (analog output, and TTL-level output)
• TTL output valid signal is low
• the analog output increases with the concentration, the higher the voltage the higher the concentration
• the Formaldehyde Aldehydes gas with high sensitivity
• with a long life and reliable stability
• fast response characteristics
• with mounting holes to facilitate fixed installation

Model No.
MQ-138
Sensor Type
Semiconductor
Standard Encapsulation
Stainless steel
Detection Gas
Formaldehyde Aldehydes
Concentration
• Toluene 10-100ppm
• Methanol 5-100ppm
• Alcohol 30-300ppm
• Acetone 10-300ppm
• Formaldehyde 1-10ppm
Circuit
Loop Voltage
Vc
≤24V DC

Heater Voltage
VH
5.0V±0.2V AC or DC

Load Resistance
RL
Adjustable
Character
Heater Resistance
RH
31Ω±3Ω(Room Temp.)

Heater consumption
PH
≤900mW

Sensing Resistance
Rs
2KΩ-15KΩ (in 50ppm NH3)

Sensitivity
S
Rs (in air)/Rs (in 5000ppm CH4)≥5

Slope
α
≤0.6 (R100ppm/R50ppm NH3)
Condition
Temperature/Humidity
20℃±2℃; 65%±5%RH

Standard test circuit
Vc:5.0V±0.1V
 VH: 5.0V±0.1V

Preheat time
Over 48 hours


Dimension: 32 x 22 x 30mm


Connection mode:
1. GND
2. AO
3. DO
4. VCC

Modello No.
MQ-138
Tipo di sensore
Semiconduttore
Materiale capsula
Acciaio inossidabile
Gas Rilevato
Formaldeide Aldeidi
Concentrazione
• Toluene 10-100ppm
• Metanolo 5-100ppm
• Alcol 30-300ppm
• Acetone 10-300ppm
• Formaldeide 1-10ppm
Circuito
Tensione del circuito
Vc
≤24V DC

Tensione del riscaldatore
VH
5.0V±0.2V AC or DC

Resistenza di carico
RL
Regolabile
Character
Resistenza del riscaldatore
RH
31Ω±3Ω(Room Temp.)

Assorbimento del riscaldatore
PH
≤900mW

Resistenza di rilevamento
Rs
2KΩ-15KΩ (in 50ppm NH3)

Sensibilità
S
Rs (in air)/Rs (in 5000ppm CH4)≥5

Pendenza
α
≤0.6 (R100ppm/R50ppm NH3)
Condizioni
Temperatura/Umidità
20℃±2℃; 65%±5%RH

Standard test circuit
Vc:5.0V±0.1V
 VH: 5.0V±0.1V

Tempo di pre-riscaldamento
Over 48 hours


Dimensione: 32 x 22 x 30 mm


Modalità di connessione:
1. GND
2. AO
3. DO
4. VCC

Additional Information

Additional Information

SKU P16092242
Output Type Analogic, Digital
Input Voltage 5 V
Terminals Headers
Target Module

Reviews

Write Your Own Review

You're reviewing: MQ-138 Formaldehyde aldehydes gas sensor module for Arduino, Raspberry Pi and MCU

Product Tags

Product Tags

Use spaces to separate tags. Use single quotes (') for phrases.

Unauthorized reproduction is prohibited for all content (images, texts, documentation, etc ...) of this site as property of :
Global Engineering Network srl
Sede legale : Piazzetta alla Posta 13 - 31022 Preganziol (TV) - Italy | Sede Operativa : Via A. Volta 23 - 31030 Dosson di Casier (TV) - Italy
C.F. e P.IVA: 04147150264 | CCIAA: 5646893 | REA: 326590