Product Introduction
Combustible Gas (LPG) Sensor SB-15-00 Description:
SB-15 is a tin dioxide semiconductor gas sensor. It has excellent detection performance for propane and butane, high sensitivity, and very low power consumption (120mW). It responds quickly, has strong resistance to poisoning, and is insensitive to interfering gases.
Combustible Gas (LPG) Sensor SB-15-00 Parameters:
Structure
The gas sensing semiconductor element is bead-shaped with embedded heater coil and electrode wires. The sensing element is mounted in a metal housing with a double-layer stainless steel mesh (100 mesh) in the gas flow path. The mesh has explosion-proof properties. (Fig1)
Operating Conditions
Fig2 shows the standard operating circuit for this model. The change in sensor resistance (RS) can be obtained through the change in output voltage across a fixed or variable resistor (RL). To achieve proper performance and specified characteristics, the values of heater voltage (VH), circuit voltage (Vc), and load resistance (RL) must be within the ranges specified in the standard operating conditions, as shown in the specification table on the next page.
Sensitivity Characteristics
Fig 3 shows the sensitivity curve of SB-15 (typical data). The sensitivity characteristics of FIS gas sensors are expressed by the relationship between sensor resistance and gas concentration. The increase in gas concentration is logarithmically related to the decrease in sensor resistance. The sensitivity characteristics of SB-15 are specified by the following parameters:
-- Sensor resistance: in air containing 1000 ppm isobutane
-- Sensor resistance change rate: in air containing 1000 ppm to 3000 ppm isobutane
Specific Parameters
A. Standard Operating Conditions
| Symbol |
Parameter |
Specification |
Condition |
| VH |
Heater Voltage |
0.90V ± 0.05V |
AC or DC or pulse |
| VC |
Circuit Voltage |
<5.0V |
DC: pin 2 (+) pin 1 (-) |
| RL |
Load Resistance |
Variable (>200Ω) |
PS<10mW |
| RH |
Heater Resistance |
2.8Ω ± 0.2Ω |
Room temperature |
| IH |
Heater Current |
132mA |
IH = VH / RH (typical) |
| PH |
Heater Power Consumption |
120mW |
PH = VH2 / RH (typical) |
B. Environmental Conditions
| Symbol |
Parameter |
Specification |
Condition |
| Tao |
Operating Temperature |
-10~50°C |
Recommended range |
| Tas |
Storage Temperature |
-30~100°C |
|
| RH |
Relative Humidity |
<95%RH |
|
| （O2） |
Oxygen Concentration |
21% ± 1% (standard conditions) |
Minimum: >18% |
| Sensitivity parameters are affected by changes in oxygen concentration. |
|||
C. Sensitivity Parameters
| Model |
SB-15-00 |
||
| Symbol |
Parameter |
Specification |
Condition |
| RS |
Sensor Resistance |
0.2kΩ~2kΩ |
In air with 1000 ppm isobutane |
| β |
Sensitivity Slope |
0.55~0.75 |
RS in air with 3000 ppm isobutane / RS in air with 1000 ppm isobutane |
| Standard test conditions: Temperature: 20 °C ± 2 °C, VC: 5.0 V ± 5% |
|||
D. Mechanical Structure Parameters
| Item |
Condition |
Specification |
| Vibration |
Frequency: 5~500Hz |
Should meet satisfactory specifications in sensitivity parameters |
| Shock |
Height: 60cm |
E. Component Materials
| No. |
Part |
Material |
| 1 |
Stainless steel mesh |
SUS316 (100 mesh, double layer) |
| 2 |
Heater coil |
Pt |
| 3 |
Sensing element |
SnO2 |
| 4 |
Lead wires |
Pt |
| 5 |
Metal housing |
Nickel-plated brass |
| 6 |
Plastic substrate |
Polybutylene terephthalate (PBT) |
| 7 |
Electrode pins |
Iron-nickel alloy |
Volume
