Winson MC227D Catalytic Flammable Gas Sensor User Manual

: June 3, 2024
: WINSON

Table of Contents

Winson MC227D Catalytic Flammable Gas Sensor
Statement
Product
Features
Main Applications
Parameters
Conditions must be avoided
Usage suggestions
References
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Winson MC227D Catalytic Flammable Gas Sensor

Statement

This manual copyright belongs to Zhengzhou Winsen Electronics Technology Co., LTD. Without written permission, any part of this manual shall not be copied, translated, or stored in a database or retrieval system, also can’t be spread through electronic, copying, or record ways.

Thanks for purchasing our product. In order to let customers use it better and reduce the faults caused by misuse, please read the manual carefully and operate it correctly in accordance with the instructions. If users disobey the terms or remove, disassemble, or change the components inside of the sensor, we shall not be responsible for the loss. The specifics such as color, appearance, sizes …etc, please in kind
We are devoting ourselves to product development and technical innovation, so we reserve the right to improve the products without notice. Please confirm it is the valid version before using this manual. At the same time, users’ comments on optimized using ways are welcome. Please keep the manual properly, in order to get help if you have questions during the usage in the future.

Product

MC227D adopts the catalytic combustion principle, and its two arms of electric bridge consist of a test element and a compensating element. The resistance of the test element rises once it meets the combustible gases, at the same time, the output voltage of the bridge changes and the voltage variation rises in direct proportion to the gas concentration. The compensating element, as a conference, has the function of compensating temperature and humidity.

Features

Bridge output voltage in linear
Fast response
Good repeatability and selectivity
Good stability and reliability
Resist H2S poisoning & organosilicone.

Main Applications

It is widely used in public places (not industrial occasions) to detect the concentration or leakage of combustible gases such as natural gas, LPG, and coal gas.

Parameters

Model	MC227D
Sensor Type	Catalytic Type
Standard Encapsulation	Plastic base & metal cap
Working voltage(V)	2.5±0.1
Working current(mA)	150±10
Sensitivity (mV)	20%LEL CH4
20%LEL C3H8	10～30
Linearity	≤5%
Measuring range(%LEL)	0～100
Response Time (90%)	≤10s
Recovery Time (90%)	≤30s
Working Environment	-40～+70℃ <95%RH
Storage Environment	-20～+70℃ <95%RH
Lifespan	5 years

Sensor Structure

Sensitivity and Response Feature

Changing of the output signal at different temperature

$Winson-MC227D-Catalytic-Flammable-Gas-Sensor-fig- $5$$

Changing of the output signal at different humidity

$Winson-MC227D-Catalytic-Flammable-Gas-Sensor-fig- $6$$

Changing of the output signal with different voltage supplying

$Winson-MC227D-Catalytic-Flammable-Gas-Sensor-fig- $7$$

Long-term Stability
The drift in the air per year is within ±2mV, and in 20%LEL C3H8 is within ±5mV. For a short period of storage (in 2 weeks), the sensor need to be galvanized continuously for 8 hours to reach stability. For long-period storage (one year), it needs 48 hours.

$Winson-MC227D-Catalytic-Flammable-Gas-Sensor-fig- $8$$

Cautions

The following conditions must be prohibited
Exposed to organic silicon steam Sensing material will lose sensitivity and never recover if the sensor absorbs organic silicon steam. Sensors must avoid exposure to silicon bonds, fixtures, silicon latex, putty or plastic- containing silicon environment.

High Corrosive gas

If the sensors are exposed to high-concentration corrosive gas (such as H2S, SOX, Cl2, HCl, etc.), it will not only result in corrosion of the structure of the sensor, but also cause sincere sensitivity attenuation.

Alkali, Alkali metals salt, halogen pollution
The sensor’s performance will be changed badly if sensors be sprayed and polluted by alkali metals salt, especially brine, or be exposed to halogen such as fluorine.

Touch water
The sensitivity of the sensors will be reduced when spattered or dipped in water.

Freezing
Do avoid icing on the sensor’s surface, otherwise sensing material will be broken and lost sensitivity.

Applied higher voltage
The applied voltage on the sensor should not be higher than stipulated value, even if the sensor is not physically damaged or broken, it causes down-line or heater damage, and bring on the sensor’s sensitivity characteristic changed badly.

Conditions must be avoided

Water Condensation
Indoor conditions and slight water condensation will influence sensors’ performance lightly. However, if water condensates on the sensor surface and keeps a certain period, the sensor’s sensitivity will be decreased. 2.2 Used in high gas concentration
No matter whether the sensor is electrified or not, if it is placed in high gas concentration for a long time, the sensor’s characteristics will be affected. If lighter gas sprays the sensor, it will cause extreme damage.

Long-time storage
The sensor’s resistance will drift reversibly if it’s stored for a long time without electricity, this drift is related to storage conditions. Sensors should be stored in an airproof bag without volatile silicon compounds. For the sensors with long time storage but no electricity, they need a long galvanic aging time for stability before using. The suggested aging time is 24 hours at least if the storage time is more than half a year.

Long time exposed to adverse environment
No matter the sensors are electrified or not, if exposed to an adverse environment for a long time, such as high humidity, high temperature, or high pollution, etc., it will influence the sensors’ performance badly.

Vibration
Continual vibration will result in sensor down-lead response and then break. In transportation or assembling lines, a pneumatic screwdriver/ultrasonic welding machine can lead to this vibration.

Concussion
If sensors meet strong concussion, it may lead its lead wire to disconnected.

Usage suggestions

Pins connection
When the sensor is connected to the circuit, one of the detection part pins and one of the compensation part pins connect as the signal output. The other pin of the detection part connects to the negative electrode, while the other pin of the compensation part connects to the positive electrode. The part with the “D” mark on the sensor bottom is the detection one, and the other part with the “C” mark is the compensation one.

Soldering

For sensors, handmade welding is the optimal way. The welding conditions are as follows: