605-00007 Parallax Inc, 605-00007 Datasheet - Page 2

• Manufacturer Part Number: 605-00007
• Description: Flow Sensors CO Gas Sensor
• Manufacturer: Parallax Inc

Specifications of 605-00007

• Supply Voltage: 5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Heating voltage 1.4v (Low) 90s
HANWEI ELECTRONICS CO ., LTD
6 pin ,4 of them are used to fetch signals, and other 2 are used for providing heating current.
Electric parameter measurement circuit is shown as Fig.2
0.01
E. Sensitivity characteristic curve
100
0.1
10
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1
Fig.3
10
sensitivity characteristics of the MQ-7
CO
H2
LPG
CH4
Alcohol
air
100
Heating voltage 5v (High) 60s
Vc
MQ-7
A
A
A向
V
RL
Fig.2
1000
RL
FAX:[phone]
1
2
3
4
5
6
7
8
9
Fig.1
MQ –7
Gas sensing
Electrode
Electrode line
Heater coil
Tubular ceramic
Anti-explosion
network
Clamp ring
Resin base
Tube Pin
10000
layer
ppm
Standard circuit:
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
high
circularly ). The second is the signal output circuit,
it can accurately respond changes of surface
resistance of the sensor.
Parts
voltage
Materials
SnO
Au
Pt
Ni-Cr alloy
Al
Stainless steel gauze
(SUS316 100-mesh)
Copper plating Ni
Bakelite
Copper plating Ni
2
O
2
Fig.3 is shows the typical
sensitivity characteristics of
the MQ-7 for several gases.
Ro: sensor resistance at 100ppm
Rs: sensor resistance at various
3
and
in their: Temp: 20℃、
Humidity: 65%、
O
RL=10kΩ
concentrations of gases.
2
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CO in the clean air.
concentration 21%
http://www.hwsensor.com
the
low
voltage
work