Winsen MC114 Catalytic Gas Sensor User Manual
- June 3, 2024
- Winsen
Table of Contents
Winsen MC114 Catalytic 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 prevail. 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 the optimized using way are welcome. Please keep the manual properly, in order to get help if you have questions during the usage in the future. Zhengzhou Winsen Electronics Technology CO., LTD
MC114/ MC114C Catalytic Flammable Gas Sensor
Profile
MC114/ MC114C 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, in
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
It has good sensitivity to methane in wide range and has advantages such as
long lifespan, low cost, and simple drive circuit &etc. The bridge output is
linear, quick response, good repeatability and selectivity, good stability,
and excellent resistance to the interference of H2S gas and organosilicon.
Main Applications
It is widely used in industrial occasion to detect the concentration of
natural gas, LPG,coal gas and alkanes. It is also used in combustible gas
leakage alarm system, combustible gas detector and gas concentration meter and
so on.
Technical Parameters
| Model | MC114/ MC114C |
|---|---|
| Sensor Type | Catalytic |
| Standard Encapsulation | Metal, Metallurgy powder mesh |
| Working voltage(V) | 2.5±0.1 |
| Working current(mA) | MC114: 150±10; MC114C: 90±10 |
| Sensitivity (mV) | 1% CH4 |
| 1% C3H8 | 20~50 |
| Linearity | ≤5% |
| Measuring range(%LEL) | 0~100 |
| Response Time (90%) | ≤10s |
| Recovery Time (90%) | ≤30s |
| Working Environment | -40 ~ +70℃, less than 95%RH |
| Storage Environment | -20 ~ +70℃, less than 95%RH |
| Size (mm) | MC114: 19×9.5×14; MC114C: 14×8×10 |
| Lifespan | 3 years |
| Anti-explosion Mark | ExdibⅠ |
Sensitivity, response and recovery
Changing of output signal at different temperature
Changing of output signal at different humidity
Changing of output signal with different voltage supplying
Long-term Stability
The drift in air per year is within ±2mV, in 1%CH4 is within ±2mV. For a short
period storage (in 2 weeks), the sensor need be galvanical continuously for 8
hours to reach stability. For more than one year storage, it need more than 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 H2 S,
SOX, Cl2, HCl etc.), it will not only result in corrosion of the structure of
the sensor, also it 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 the stipulated
value, even if the sensor is not physically damaged or broken, it causes down-
line or heater damaged, and bring on sensor’s sensitivity characteristic to
change badly.
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
one of the detection part pins connects the negative electrode, while the
other one of the compensation part pins connects to the positive electrode.
The part with the “■” mark is the detection part( for the separate type
sensor, the one part with a bigger hole is the detector part),the other part
is the compensation part.
The following conditions must be avoided
Water Condensation
Indoor conditions, slight water condensation will influence sensors’
performance lightly. However, if water condensation on sensors surface and
keep a certain period, sensors’ sensitive will be decreased.
Used in high gas concentration
No matter the sensor is electrified or not, if it is placed in high gas
concentration for long time, sensors 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 long time
without electricity, this drift is related with storage conditions. Sensors
should be stored in airproof bag without volatile silicon compounds. For the
sensors with long time storage but no electrification, they need long galvanic
aging time for stability before use. 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 the adverse
environments for 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 then break. In
transportation or assembling line, a pneumatic screwdriver/ultrasonic welding
machine can lead this vibration.
Concussion
If sensors meet strong concussion, it may lead its lead wire to disconnected.
Usage Conditions
For sensor, handmade welding is optimal way. The welding conditions as follow:
- Soldering flux: Rosin soldering flux contains least chlorine
- Homothermal soldering iron
- Temperature： ≤350℃
- Time： less than 5 seconds
If disobey the above using terms, sensors sensitivity will be reduced.
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