HANWEI
ELECTRONICS CO ., LTD
TECHNICAL
MQ – 7
DATA
http://www.hwsensor.com
MQ-7
GAS SENSOR
FEATURES
* High sensitivity to carbon monoxide * Stable and long life APPLICATION
They are used in gas detecting equipment for carbon monoxide(CO) in family and industry or car. SPECIFICATIONS
A. Standard work condition Symbol Parameter name Vc circuit voltage VH (H) Heating voltage (high) VH (L) Heating voltage (low) RL Load resistance resistan ce
Technical condition conditi on 5V!0.1 5V!0.1 1.4V!0.1 Can adjust
Remark Ac or Dc Ac or Dc Ac or Dc
RH TH (H) TH (L) PH
33"!5% 60!1 seconds 90!1 seconds About 350mW
Room temperature
Heating resistance Heating time (high) Heating time (low) Heating consumpti on
b. Environment conditions Symbol Tao Tas RH O2
c.
Parameters Using temperature Storage temperature temperat ure Relative humidity Oxygen concentration
Technical conditions conditi ons -20#-50# -20#-50# Less than 95%RH 21%(stand condition) the oxygen concentration can affect affect the t he sensitivity characteristic
Remark Advice
using scope
Minimum value is over 2%
Sensitivity characteristic
symbol Rs
$(300/100ppm) Standard working condition Preheat time
Parameters Surface resistance resistan ce Of sensitive body Concentration slope rate
Technical parameters 2-20k Less than 0.5
Remark In 100ppm Carbon Monoxide Rs (300ppm)/Rs(100ppm) (300ppm)/Rs(100ppm)
Temperature -20#!2# relative humidity 65%!5% RL:10K"!5% Vc:5V!0.1V VH:5V!0.1V VH:1.4V!0.1V No less than 48 hours Detecting Detectin g range: 20ppm-2000ppm carbon monoxide
D. Structure and configuration, basic measuring measuring circuit Structure and configuration of MQ-7 gas sensor is shown as Fig. 1 (Configuration A or B), sensor composed by micro AL2O3 ceramic tube, Tin Dioxide (SnO2) sensitive layer, measuring electrode and heater are fixed into a crust made by plastic and stainless steel net. The heater provides necessary work conditions for work of sensitive components. The enveloped MQ-7 have
HANWEI
ELECTRONICS CO ., LTD
MQ – 7
http://www.hwsensor.com
6 pin ,4 of them are used to fetch signals, and other 2 are used for providing heating current. 1 2 3 4 5 6 7 8 9
Parts Gas sensing layer Electrode Electrode line Heater coil Tubular ceramic Anti-explosion network Clamp ring Resin base Tube Pin
Materials SnO2 Au Pt Ni-Cr alloy Al2O3 Stainless steel gauze (SUS316 100-mesh) Copper plating Ni Bakelite Copper plating Ni
Fig.1
A
A A&
Standard circuit: Heating voltage 5v (High) 60s
VRL
H
As shown in Fig 2, standard measuring circuit of MQ-7 sensitive components consists of 2 parts. one is heating circuit having time control function (the
RL Vc
high
voltage
and
the
low
voltage
circularly ). The second is the signal output circuit, it can accurately respond changes of surface resistance of the sensor.
Fig.2
Heating voltage 1.4v (Low) 90s
Electric parameter measurement circuit is shown as
Fig.2
E. Sensitivity characteristic curve MQ - 7
100
Fig.3 is shows the typical sensitivity characteristics of the MQ-7 for several gases.
10
in their: Temp: 20#% Humidity: 65%%
o
R
O2 concentration 21%
1
/
s R
RL=10k" CO
Ro: sensor resistance at 100ppm
H2
L PG CH4 A l coho l
0.1
CO in the clean air. Rs: sensor resistance at various
a ir
pp m
0 . 01 10
100
work
1000
sensitivity characteristics of the MQ-7
10000
concentrations of gases.
HANWEI
ELECTRONICS CO ., LTD
R /
s R
- 10
http://www.hwsensor.com
MQ - 7
1. 5 1. 4 1. 3 1. 2 1. 1 1 0. 9 0. 8 0. 7 0. 6 0. 5
o
MQ – 7
Fig.4 is shows the typical Fig.4
33%RH
dependence of the MQ-7 on temperature and humidity.
85%RH
Ro: sensor resistance at 100ppm CO in air at
33%RH and 20degree.
Rs: sensor resistance at 100ppm CO at Temp 0
10
20
30
40
different temperatures and humidities.
50
OPERATION PRINCIPLE
. The surface resistance of the sensor Rs is obtained through effected voltage signal output of the load resistance RL which series-wound. The relationship between them is described: Rs\RL = (Vc-VRL) / VRL Fig. 5 shows alterable situation of RL signal output measured by using Fig. 2 circuit output In 100ppmCO
In air
In air
VH5v
1.4v
60s
90s
Signal
Fig.5
signal when the sensor is shifted from clean air to carbon monoxide (CO) , output signal measurement is made within
one or two complete heating period (2.5 minute from high voltage
to low voltage ). Sensitive layer of MQ-7 gas sensitive components is made of SnO2 with stability, So, it has excellent long term stability. Its service life can reach 5 years under using condition. SENSITVITY ADJUSTMENT
Resistance value of MQ-7 is difference to various kinds and various concentration gases. So, When using this components, sensitivity adjustment is very necessary. we recommend that you calibrate the detector for 200ppm CO in air and use value of Load resistance that( R L) about 10 K"(5K" to 47 K"). When accurately measuring, the proper alarm point for the gas detector should be determined after considering the temperature and humidity influence. The sensitivity adjusting program: a. Connect the sensor to the application circuit. b. Turn on the power, keep preheating through electricity over 48 hours. c. Adjust the load resistance RL until you get a signal value which is respond to a certain carbon monoxide concentration at the end point of 90 seconds. d. Adjust the another load resistance RL until you get a signal value which is respond to a CO concentration at the end point of 60 seconds . Supplying special IC solutions, More detailed technical information, please contact us.
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Device Type:
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Description:
Humidity & Temperature Sensor SHTxx
Part Order No.
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Date of Delivery: DD.MM.YYYY Order Code:
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