Winson MC227D Catalytic Flammable Gas Sensor User Manual
- June 3, 2024
- WINSON
Table of Contents
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
Changing of the output signal at different humidity
Changing of the output signal with different voltage supplying
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.
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:
- Soldering flux: Rosin soldering flux contains the least chlorine
- Homothermal soldering iron
- Temperature： ＜350℃
- Time： less than 5 seconds
If disobey the above-using terms, the sensors’ performance will get worse.
Tel: 86-371-67169670/67169097 Fax: 86-371-60932988 Email: sales@winsensor.com.
References
- Winsen Gas Sensor_CO2 Sensor_Air Quality Sensor_Dust Sensor_CO Sensor-Winsen Electronics
- Winsen Gas Sensor_CO2 Sensor_Air Quality Sensor_Dust Sensor_CO Sensor-Winsen Electronics