The SP gas sensor series was developed using an advanced thick film printing technology. By applying this technology on a small thin ceramic substrate, 300 to 400mW power consumption is achieved. Combinations of new design, variations of sensing materials and levels of control have led to improvements in sensor performance and a wide variation in product range.
On this page you’ll find specifications for these Nissha FIS SP gas sensors:
We provide gas detection equipment for methane, solvents, propane or butane, refrigerants, hydrocarbons and hydrogen, as well as to monitor indoor air quality.
Gas sensitive semiconductor material is formed on the alumina substrate on which the gold electrodes are printed. A thick film heater of ruthenium oxide is printed on the reverse of the substrate and placed in the plastic housing (Fig 1 in each models data sheet).
Fig 2 in each product data sheet shows the standard operating circuit for that particular model, unless otherwise stated, the operation on all of our gas sensors is the same process:
The change of the sensor resistance (RS) is obtained as the change of the output voltage across the fixed or variable resistor (RL). In order to obtain the best performance and specified characteristics, the values of the heater voltage (VH) circuit voltage (VC) and load resistance (RL) must be within the range of values given in the standard operating conditions shown in the Specification table on the next page.
Fig 3 in each data sheet shows the sensitivity characteristics curves of that particular gas sensor. Sensitivity characteristics of the Nissha FIS gas sensors are expressed by the relationship between the sensor resistance and gas concentration. The sensor resistance decreases with an increase of gas concentration based on a logarithmic function. Each sensors resistance level and changer ratio can be below.
The SP-12A is a tin di-oxide semiconductor gas sensor which has a good sensitivity and excellent selectivity to methane. The SP-12A has also a significant feature in good stability after exposure to
silicone compounds. Using the SP-12A, the most reliable methane detection can be achieved.
The sensitivity characteristics of the SP-12A is specified by the following parameters.
• Sensor resistance level: at methane 5000 ppm
• Sensor resistance change ratio: between methane 3000 ppm and 7000 ppm
For more information on the SP-12A for methane detection, including operating conditions, and sensitivity and mechanical characteristics, download our SP-12A brochure.
The SP-31 is a tin di-oxide semiconductor gas sensor which has a high sensitivity to solvents such as alcohol, toluene.
The circuit for the sensor is composed of two parts as shown in Fig 2. One part is for supplying heater voltage (VH) and the other is for the output signal (VC), which is current or voltage reflecting sensor resistance (RS) change. The change of the sensor resistance is generally obtained as the change of the output voltage across the fixed or variable resistor (RL) in series with the sensor resistance. In order to obtain the best performance and specified characteristics, the values of the heater voltage, circuit voltage and load resistance (RL) must be within the range of values given in the standard operating conditions shown in the Specification table in our data sheet.
The sensitivity characteristics of the SP-31 are specified by the following parameters.
• Sensor resistance level: at ethanol 300 ppm
• Sensor resistance change ratio: between ethanol 50 ppm and 300 ppm
For more information on the SP-31 for solvent detection, including operating conditions, and sensitivity and mechanical characteristics, download our SP – 31 data sheet.
The SP-15A is a tin dioxide semiconductor propane gas sensor which has a high sensitivity and excellent selectivity in propane/ butane detection. The SP-15A has also a significant feature in
good stability after exposure to silicone compounds. Using the SP-15A, the most reliable LPGas leak detection can be achieved.
The sensitivity performance of the SP-15A is specified by the following parameters.
• Sensor resistance level: at iso-butane 1500 ppm
• Sensor resistance change ratio: between iso-butane 1500 ppm and 3000 ppm
For full details on the operating conditions and characteristics of this gas sensor download our SP – 15A data sheet.
The SP-42A is a tin dioxide semiconductor gas sensor which has a high sensitivity to HFCs (e.g. Freon: R-134a) with improved cross sensitivity to other gases. This model is suitable for R-134a, R 410a, R407c and other new freon family which contain R-134a.
The sensitivity characteristics of the SP-42A is specified by the following parameters.
• Sensor resistance level: at R134a 100 ppm
• Sensor resistance change ratio: between R-134a 100 ppm and 300 ppm
For more information about this gas sensor, download our SP-42A data sheet.
The SP3S-AQ2 series is a tin dioxide semi conductor gas sensor which has a high sensitivity to various air pollution sources (e.g. VOCs) with quick response speed. This series uses a compact plastic housing with 3 pins configuration achieving an excellent gas sensing performance with low cost. This model is ideal for various design of automatic air quality control systems ; Ventilation Fans , air purifiers.
Fig 3 shows the sensitivity characteristics curves of the SP3S-AQ2 (typical data). Sensitivity characteristics of the Nissha FIS gas sensors are expressed by the relationship between the sensor resistance and gas concentration. The sensor resistance decreases with an increase of gas concentration based on a logarithmic function.
The sensitivity characteristics of the SP3S-AQ2 are specified by the following parameters.
– Sensor resistance level: in air
– Sensor resistance change ratio: between hydrogen 10 ppm and in air
For more information on this gas sensor for indoor air quality download out SP3S-AQ2 brochure.
The SP-11 is a tin di-oxide semiconductor gas sensor which has a high sensitivity to methane, propane, butane and other hydrocarbons with reduced sensitivity to alcohol. The SP-11 is suitable for
general hydrocarbon gas detection.
The sensitivity characteristics of the SP-11 is specified by the following parameters.
• Sensor resistance level: at methane 3000 ppm
• Sensor resistance change ratio: between methane 1000 and 3000 ppm
For the full details of this Hydrocarbons gas detector, download our SP11 Data Sheet
The SP-19 is a tin di-oxide semiconductor gas sensor which has a high sensitivity and selectivity to hydrogen. Using this model, detection of hydrogen is possible from low concentration ranges.
The sensitivity characteristics of the SP-19 is specified by the following parameters.
• Sensor resistance level: at hydrogen 100 ppm
• Sensor resistance change ratio: between hydrogen 100 ppm and 1000 ppm
Download our SP-19 Data Sheet to see the full specification for this gas sensor.
