1. Description

  The ZC25C-1 catalytic combustion gas sensor works according to the principle of catalytic combustion effect. It is composed of a detection element and a compensation element paired to form an arm of the bridge. When encountering combustible gas, the resistance of the detection element increases, and the output voltage of the bridge changes. The voltage variable increases in direct proportion to the increase of gas concentration. The compensation element plays a reference and temperature and humidity compensation role.

2. Technical specifications

3. Appearance and dimension

4. Basic test circuit

5.Precautions for use

1. Situations that must be avoided

1.1 Exposure to volatile silicon compound vapor

If the surface of the sensor adsorbs volatile silicon compound vapor, the sensitive material of the sensor will be wrapped by the silicon compound, inhibiting the sensitivity of the sensor and making it irreversible. The sensor should avoid being exposed to places where silicone adhesives, hair spray, silicone rubber, putty or other silicone-containing plastic additives may exist.

1.2 Highly corrosive environment

Sensors exposed to high concentrations of corrosive gases (such as H2S, SOX, Cl2, HCl, etc.) will not only cause corrosion or damage to the sensor leads, but also cause irreversible changes in the performance of sensitive materials.

1.3 Alkali, alkali metal salts, halogen pollution

After the sensor is contaminated by alkali metals, especially salt water spray, if it is exposed to halogens such as Freon, it will also cause performance deterioration.

1.4 Contact with water

Splashing or immersion in water will cause a decrease in sensitive characteristics.

1.5 Freezing

Water freezing on the surface of the sensitive element will cause the sensitive material to break and lose its sensitive characteristics.

1.6 Excessive applied voltage

If the voltage applied to the sensor is higher than the specified value, even if the sensor is not physically damaged or destroyed, it will cause damage to the lead and cause the sensor's sensitivity to decrease.

1.7 Connecting to the circuit

When the sensor is connected to the circuit, one pin of the detection element and the compensation element are connected together as the signal output end, one pin of the detection element is connected to the negative pole, and the other pin of the compensation element is connected to the positive pole; the one marked with "D" at the bottom of the sensor socket is the detection element, and the one marked with "C" at the bottom of the socket is the compensation element.

2. Situations to avoid as much as possible

2.1 Condensation

Under indoor use conditions, slight condensation will have a slight effect on the performance of the sensor. However, if water condenses on the surface of the sensitive material and remains for a period of time, the sensor characteristics will decrease.

2.2 In high-concentration gas

Whether the sensor is powered on or not, long-term placement in high-concentration gas will affect the sensor characteristics. If the lighter gas is sprayed directly at the sensor, it will cause great damage to the sensor.

2.3 Long-term storage

When the sensor is stored for a long time without power, its sensitive material will undergo reversible changes, which are related to the storage environment.

The sensor should be stored in a sealed bag with clean air and without silicone. Sensors that have been stored for a long time without power need to be powered on for a longer time to stabilize before use. If the storage time without power exceeds half a year, it is recommended to age it for one day before use.

2.4 Long-term exposure to extreme environments

Regardless of whether the sensor is powered or not, long-term exposure to extreme conditions such as high humidity, high temperature or high pollution will seriously affect the performance of the sensor.

2.5 Vibration

Frequent and excessive vibration can cause the sensor leads to resonate and break. The use of pneumatic screwdrivers/ultrasonic welding machines during transportation and on the assembly line will produce such vibrations.

2.6 Shock

If the sensor is subjected to strong shock or falls, its leads will break.

2.7 Use

Manual soldering is the most ideal soldering method for sensors. The recommended soldering conditions are as follows:

 Flux: Rosin flux with the least chlorine

 Constant temperature soldering iron

 Temperature: no more than 350℃

 Time: no more than 5 seconds

Violation of the above use conditions will degrade the sensor characteristics.

TenSensor, China's first listed gas sensor company,Tensensor can provide more than 100 varieties of six series including：

semiconductor gas sensor

electrochemical gas sensor

infrared gas sensor

dust sensor

pyroelectric sensor

thermopile sensor, etc. 

which can be used for more than 200 kinds of gas and infrared, dust and other indicators detection, widely used in the field of security for  detecting gas leakage, noxious gas leakage, smog and fire, the field of family, office and factory for detecting HCHO, VOC, CO2, PM2.5 and so on. 

Moreover, the solutions for security, household electrical appliances, consumer electronics, smart home, instruments and meters are available.

For more information about ZC25C-1sensor, please contact  account manager.

 TEL：0086-0351-5249552

 Whatsapp：+86 18335818384

 Email：[email protected]