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HS-134 Carbon Monoxide sensor element

1. Characteristics:
  • High sensitive and good selectivity to low carbon monoxide concentration;
  • Long life and reliable stability.
2. Structure, configuration, symbol of components:
  • Structure and configuration of HS-134 is shown as Fig 1, sensitive components composed by micro Al2O3 ceramic tube, Tin Dioxide (SnO2) sensitive layer, active carbon filtering layer include and made by plastic and stainless steel net.



  • Fig 1
  • Active carbon Particle reduces interference from gases of NOx, Alkane, etc.
  • The enveloped HS-134 gas sensitive components have 6 pin, 4 of them are used to take signals (A, B), and other 2 (H) are used for providing heating current (Fig 2).

Fig 2

3. Working principle:
  1. Standart circuit:
    As shown in Fig 3, standard measuring circuit of HS-134 include 2 parts. One is heating circuit. have time control function (the high voltage and the low voltage work circularly). The second is the signal output circuit, it can accurately respond changes of surface resistance of the sensor.



  2. Fig 3

  3. The surface resistance of the sensor RS of obtained through effected voltage signal output of the load resistance RL which series-wound. The relationship between them as below:
    RS/RL=(VC - VRL)/VRL


    Fig 4


    Fig 4 is relative curve between output signal VRL circuit and CO gas concentration.

4. Figure


Fig 5

Base on Fig 3 circuit, Fig 5 is the signal output curve when the sensor is moved form clean air to carbon monoxide (CO) gas environment. Those data was measured after heating period 2.5 minute from high voltage to low voltage.

Environment temperature will efect to sensitivity which relatie curve show as Fig 6.


Fig 6

Sensitive layer of HS-134 was made of SnO2 material. So, it has excellent long term stability.

It service life can reach 5 years under follow standard operating condition.

Detail description

A. Standard work condition
Symbol Description Technical condition Remarks
VC Circuit voltage 5V±0.1V AC or DC
VH (H) Heating voltage (high) 4V±0.1V AC or DC
VH (L) Heating voltage (low) 1.4V±0.1V AC or DC
RL Load resistance Can be adjustable Ps < 25 mw
RH Heater resistance 33±5% At 20°C temperature
TH (H) Heating time (high) 60±1 seconds -
TH (L) Heating time (low) 90±1 seconds -
Ps Heating consumption Less than 25 mw -

B. Environment conditions
Symbol Description Technical conditions Remarks
Tao Operating temperature -20°C ~ +50°C -
Tas Storage temperature -20°C ~ +50°C Advice using scope
RH Relative humidity Less than 95% Rh -
O2 Oxygen concentration 21% (standard condition) Oxygen concentration can affect the sensitivity characteristic Minimum value is over 2%

C. Sensitivity characteristic
Symbol Parameters Technical parameters Remark
Rs Surface resistance
of sensitive body
2k - 20k
(100ppm alcohol)
In 100ppm carbon monooxide

(300/100ppm)
Concentration
slope rate
Less than 0.5 Rs (300ppm)/RS (100ppm)
Standard operating condition Temperature: 20°C±2°C
Relative humidity: 65%±5%
RL: 10k±5%
VC:5V±0.1V, VH: 4V±0.1V, VL: 1.4V±0.1V
Preheat time No less than 48 hours Detecting range: 20ppm - 1000ppm carbon monooxide

D. Mechanical characteristic
Items Conditions Property
Vibration Frequency 100cpm Should be conformed to given sensitivity characteristic
Vertical vibrating amplitude
Time 1 hour
Punch Acceleration 100G
Punch times 5

E. The relative sensitivity of HS-134 in different gases
Name of gas With active carbon filter
RS (100ppm)/RS (100ppm CO)
Without active carbon filter
RS (100ppm)/RS (100ppm CO)
Methane Can not measure Can not measure
Propane Can not measure 6.58
Isobutane Can not measure Can not measure
Hydrogen 6.25 6.0
Alcohol Can not measure 2.56
Isopropanol Can not measure 3.48
Methyl benzene Can not measure 20.98
Ethyl acetate Can not measure 3.28
Benzene Can not measure 31.20
Heptane Can not measure 3.60
Carbon dioxide Can not measure Can not measure
Hydrogen sulphurate Can not measure 0.02


6. Sensitivity adjustment:

In different concentrations of carbon monoxide. The resistance value of HS-134 is different.

So, it is necessary to adjust the sensitivity which adjusting step as below:

  1. Connect the sensor to the application circuit.
  2. Turn on the power, preheating over 48 hours (if long time storage).
  3. Adjust the load resistance RL until you get a signal value which is respond to a certain carbon monoxide concentration.
7. Measurement circuit having temperature and humidity compensation:

Different of temperature and humidity will affect to HS-134 sensitivity.

So, when accurately measuring circuit need compensation function of temperature and humidity. Include the compensation functions, please check follow reference circuit.

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