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HS-131 Nature gas sensor specification

1. Characteristics:
  • High sensitive and good slectivity to fume and alcohol;
  • Long life and reliable stability.

2. Application:
  • Gas leakage detecting in family and industry;
  • Suitable fo detecting of methane, equipments, isobutane, propane.
3. Structure of components:

Structure of HS-131 shown as Fig 1.


Fig 1


Fig 2

Items Descriptions Materials
1 Gas sensing layer SnO2
2 Measurement electrode Au
3 Measurement electrode ignited line Pt
4 Heater N1-Cr alloy
5 Tubular ceramic basic body Al203
6 Anti-explosion network 100 dual layer stainless steel (SUS316)
7 Clamp ring Ni plated
8 Basic seat Bakelite
9 Tube foot Ni plated

HS-131 have 6 pins, 4 of them are used to detect signals, and other 2 are used for providing heating current.

**Measurement circuit is shown as (Fig. 2).

4. Property

Standard work condition
Symbol Descriptions Rated Remarks
VC Circuit voltage 5V AC or DC
VH Heating voltage 5V AC or DC
RL Load resistance Can be adjustable PS < 25 mW
RH Heater resistance 33±5% At 21°C
PH Heating consumption Less than 800mw -

Environment condition
Symbol Descriptions Rated Remarks
Tao Using Tem -20°C - 50°C -
Tas Storage Tem -20°C - 70°C
RH Related humidity Less than 95% Rh
O2 Oxygen concentration 21% (standard condition) Oxygen concentration can affect sensitivity Minimum value is over 2%

Sensitivity characteristic
Symbol Description Rated Remark 1 Remark 2
RS Sensing body
resistance
2k - 20k
(5000ppm methane)
- Detecting concentration scope:
1000ppm-20000ppm methane

(5000/1000) isobutane
Concentration
slope rate
0.6
Standard
detecting
condition
Temp: 20°C±2°C
Vc: 5V±0.1V
Humidity: 65% ±5%
Vh: 5V±0.1V
Preheat time Over 24 hours

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


5. Sensitivity curve of HS-131:

Test condition:
Temp: 20°C, Humidity: 65%,
O2: concentration 21%,
RL=100k
Test environment: R0 is resistance value at 20°C,
0% Rh and in the 5000 ppm CH4.
RS is resistance value of components
in other Temperature and humidity

Fig 3 is relation curve of VRL
and gas concentration
Fig 4 is relation between surface resistance of HS-131
and environment related humidity


6. Sensitivity adjustment:

HS-131 resistance value will be changing with different spices and gas concentrations. Before operating the components, sensitivity adjustment is necessary. We suggest use 3000-10000 ppm methane (CH4) or 300 ppm - 1000 ppm isobutane <i-C4H10> is standard gas consentration.

Adjustment process:
  1. Put HS-131 components to application circuits.
  2. If use the sensor is Long time storage, suggest the preheating time must over than 24 hours in order to guarantee components property can reach stability completely.
  3. In the standard gas concentration, adjustive load resistance RL until getting output signal.
  4. Due to environment conditions will cause different sensitivity. So, please check Fig 4 drawing to modify the sensitivity character.
7. Application circuit (include temperature compensation function):

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