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HS-129 Smoke sensor specification

1. Characteristics:
  • Long period work stability;
  • Widely detecting scope.

2. Application:
  • Gas leakage detecting equipment;
  • Isobutane, propane, alcohol, hydrogen detecting.
3. Property:

Standard work condition
Symbol Description Technical condition Remarks
VC Circuit voltage 5V±0.1V AC or DC
VH Heating voltage 5V±0.1V AC or DC
RL Load resistance Can adjust RS
RH Heater resistance 33±5% At 25°C
PH Heating consumption Less than 800mw -

Environment condition
Symbol Description Technical condition 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 Technical parameter Remark 1 Remark 2
Rs Sensing body
resistance
1K - 10K
(1000ppm isobutane)
Suitable for 3000ppm
LPG and propane
Detecting
concentration scope:
300ppm-5000ppm
liquified petroleum gas and propane
300ppm-5000ppm isobutane
5000-20000ppm metane

(3000/1000) isobutane
Concentration
slope rate
0.6 (ratio)
Standard
Detecting
Condition
Temp: 20°C±2°C
Vc: 5V±0.1
Humidity: 65% ±5%
Vh: 5V±0.1
Preheat time Over 24 hours

Machinery characteristic
Project Condition Property
Vibration Frequency 100cpm Should be conformed to given sensitivity characteristic
Vertical vibrating amplitude - 0.35 mm
Time 1 hour
Punch Acceleration 100G
Punch times 5


4. Sensitivity characteristic curve of HS-129 sensor.

Drawing 1 is relation
curve of VRL and gas concentration
Drawing 2 is relation curve
between surface resistance
and environment humidity

At the: Temp: 20°C, Humidity: 65%, O2 concentration 21%, RL=5K


5. Component structure and circuit symbols:


Drawing 3.


Series Parts Materials
1 Gas sensing layer SnO2
2 Measurement electrode Au
3 Measurement electrode ignited line Pt
4 Heater Ni-Cr alloy
5 Ceramic tube Al2O3
6 Anti-explosion network 100 dual layer stainless steel (SUS316)
7 Clamp ring Ni plating
8 Basic seat Bakelite
9 Pin Ni plating


6. Electric parameter measurement circuit:

Drawing 4.
The mentioned are block diagram of standard test of HS129.
As environment temperature and humidity have certain effect to sensitivity.
So, must consider environment factor when accurately measuring.

Drawing 5 is reference circuit
(temperature compensation included)

7. Sensitivity adjustment:

Resistance value changing of HS-129 will be cause by different pieces and gas concentration. So, when using the component, sensitivity adjustment is necessary.

We suggest that use 300-3000ppm LPG gas, or 300ppm-1000ppm <i-C4H10> as sensitivity adjustment gas concentration.

Adjustment steps:
  1. Input gas to application circuits.
  2. After storage please pre-heating sensor over 24 hours in order to guarantee sensor can reach stability completely.
  3. In the detecting gas concentration, adjust load resistance RL until suitable output signal coming out.
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