Ammonia Gas Sensor (Low Concentration) - SP-53B-00

Ammonia Gas Sensor (Low Concentration) SP-53B-00 Description:

The SP-53B is a SnO2 semiconductor gas sensor with high sensitivity to low concentrations of ammonia and faster response speed than ordinary products.

Ammonia Gas Sensor (Low Concentration) SP-53B-00 Parameters:

Structure

The gas sensing semiconductor material is attached to an alumina substrate, with gold electrodes printed on the substrate. A thin ruthenium oxide heater is printed on the back of the substrate and housed in a plastic package (Fig1).

Operating Conditions

Fig2 shows the standard circuit for this product. The change in sensor resistance (Rs) causes a change in the voltage across the load resistor (RL). For optimal performance and parameters, the values of heater voltage (VH), circuit voltage (Vc), and load resistance (RL) must be within the given standard operating conditions, as specified in the parameter table on the next page.

Sensitivity Characteristics

Fig3 shows the sensitivity parameter curve of the SP-53B (typical data). The sensitivity parameter of a gas sensor reflects the relationship between sensor resistance and gas concentration. Based on logarithmic function, as sensor resistance decreases, the measured gas concentration increases. The sensitivity parameters of the SP-53B are detailed by the following parameters.

-- Sensor resistance: in air containing 50 ppm NH3

-- Sensor resistance change rate: in air containing 50 ppm to 150 ppm NH3

Specific Parameters

A. Standard Operating Conditions

Symbol	Parameter	Specification	Condition
VH	Heater Voltage	5V ±4%	AC or DC
VC	Circuit Voltage	5V ±4%	AC or DC
RL	Load Resistance	Variable	PS<15mW
RH	Heater Resistance	40 Ω ± 2Ω	Room temperature
PH	Heater Power Consumption	400mW	PH = VH2 / RH
PS	Sensor Power Consumption	Less than 15 mW	PS=(VC - VRL)2/RS

B. Environmental Conditions

Symbol	Parameter	Specification	Condition
Tao	Operating Temperature	-10~60°C	Recommended range
Tas	Storage Temperature	-20~70°C
RH	Relative Humidity	<95%RH
（O2）	Oxygen Concentration	21% ± 1% (standard condition)	PhaseFor lower values: >18%
		Sensitivity parameters are affected by changes in oxygen concentration.

C. Sensitivity Parameters

Model	SP-53B-00
Symbol	Parameter	Specification	Condition
RS	Sensor Resistance	10kΩ~100kΩ	In air with 50 ppm NH3 / in air
β	Sensitivity Slope	0.4~0.55	RS in air with 150 ppm NH3 / RS in air with 50 ppm NH3
Standard test conditions: Temperature: 20 °C ± 2 °C, VC: 5.0 V ± 1% Humidity: 65% ± 5%, VH: 5 V ± 1% (In clean air), RL: 10kΩ ± 5% Preheating time: more than 48 hours

D. Mechanical Structure Parameters

Item	Condition	Specification
Vibration	Frequency: 100 cpm Vertical amplitude: 4 mm Duration: 1 hour	Should meet the specifications in sensitivity parameters
Shock	Acceleration: 100 G Number of impacts: 5 times

E. Component Materials

No.	Part	Material
1	Sensing Element	SnO2
2	Substrate	Al2O3
3	Lead Wire	Au-Pd-Mo
4	Heater	RuO2
5	Electrode	Au
6	Plastic Housing	Nylon 46 (UL84HB)
7	Plastic Base	Nylon 66 (UL94HB)
8	Stainless Steel Mesh	SUS316 (100 mesh, double layer)
9	Heater/Electrode Pins	Nickel

Volume