Mq137 Ammonia Gas Detection Gas Sensor Module Qualitative Detection
Rs. 1,907.00 Rs. 2,174.00
- Brand: https://www.winsen-sensor.com/sensors/toxic-gas-sensor/mq137.htm
- Product Code: SEN-GAS
- SKU -
- Availability: 2-3 Days
- Price in reward points: 34
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- MQ137 for NH3 gas alarm, industrial NH3 gas leakage alarm, portable NH3 gas detector.
- Sensitive material of MQ137 gas sensor is SnO2, which with lower conductivity in clean air. When NH3 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.
- MQ137 gas sensor has high sensitivity to NH3 gas, also can monitor organic amine such as trimethylamine, cholamine well. It can detect kinds of gases including ammonia and is a kind of low-cost sensor for kinds of applications.
-Tips :For more parameter information, please refer to the latest manual provided by salesman.
-Model MQ137
-Sensor Type Semiconductor
-Standard Encapsulation Bakelite, Metal cap
-Target Gas Ammonia Gas(NH3)
-Detection range 5500ppm NH3
-Standard Circuit Conditions Loop Voltage Vc ≤24V DC
-Heater Voltage VH 5.0V±0.1V AC or DC
-Load Resistance RL Adjustable
-Sensor character under standard test conditions Heater Resistance RH 29Ω±3Ω(room tem.)
-Heater consumption PH ≤900mW
-Sensitivity S Rs(in air)/Rs(50ppmNH3)≥2
-Output Voltage △Vs ≥0.5V (in 50ppm NH3)
-Concentration Slope α ≤0.6(R200ppm/R50ppm NH3)
-Standard test conditions Tem. Humidity 20℃±2℃；55%±5%RH
-Standard test circuit Vc:5.0V±0.1V； VH: 5.0V±0.1V
-Preheat time Over 48 hours
| SPECIFICATIONS | |
| the heating voltage | 5 + 0.2V (AC · DC) |
| Working current | 180mA |
| the circuit voltage | DC5V (Max DC 24V) |
| the load resistance | 10K (adjustable) |
| the test concentration range | 5-500ppm |
| clean air voltage | < 1.5V |
| Sensitivity | > 3% |
| response time | < 1S (3-5 minute warm-up, the theory preheating time 48 hours) |
| response time | < 30S |
| the component power consumption | ≤ 0.9W |
| Working temperature | -10 ~ 50 oC (nominal temperature 20 oC) |
| Humidity | 95% RH (nominal humidity 65% RH) |
| life | 5 years |
| OVERVIEW | |
| One, size | 35mm X40mm X28mm L x W x H |
| Two main components | ammonia gas sensor |
| Third, the working voltage | DC 5V |
| IV characteristics | |
PACKAGE INCLUDES:
1 PCS x Mq137 Ammonia Gas Detection Gas Sensor Module Qualitative Detection
https://www.winsen-sensor.com/sensors/toxic-gas-sensor/mq137.html
//SOURCE CODE TAKEN FROM BELOW LINK
//https://circuitdigest.com/microcontroller-projects/arduino-mq137-ammonia-sensor
/*
* Program to measure the value of R0 for a know RL at fresh air condition
* Program by: B.Aswinth Raj
* Website: www.circuitdigest.com
* Dated: 28-12-2017
*/
//This program works best at a fresh air room with temperaure Temp: 20℃, Humidity: 65%, O2 concentration 21% and when the value of Rl is 47K
#define RL 47 //The value of resistor RL is 47K
void setup() //Runs only once
{
Serial.begin(9600); //Initialise serial COM for displaying the value
}
void loop() {
float analog_value;
float VRL;
float Rs;
float Ro;
for(int test_cycle = 1 ; test_cycle <= 500 ; test_cycle++) //Read the analog output of the sensor for 200 times
{
analog_value = analog_value + analogRead(A0); //add the values for 200
}
analog_value = analog_value/500.0; //Take average
VRL = analog_value*(5.0/1023.0); //Convert analog value to voltage
//RS = ((Vc/VRL)-1)*RL is the formulae we obtained from datasheet
Rs = ((5.0/VRL)-1) * RL;
//RS/RO is 3.6 as we obtained from graph of datasheet
Ro = Rs/3.6;
Serial.print("Ro at fresh air = ");
Serial.println(Ro); //Display calculated Ro
delay(1000); //delay of 1sec
}
15 days