| Target: | Combustible gas |
| Model: | MH-742B |
| Detection range: | 0～100% Vol optional |
| Detection principle: | non-dispersive infrared (NDIR) principle |
| Characteristics: | 1.High sensitivity, high resolution, low power consumption; 2.Widely used for industrial field instrumentation, industrial-process control and safety protection |
| Size: | Φ39×44 mm |
| Working conditions: | 4.5～5.5 V DC |
| Measurement range: | Please refer to the instruction |
| Resolution and accuracy: | Please refer to the instruction |
| Response time: | T90 ＜ 30 s |
| Notes: | This product has been discontinued |
MH-742B Manual download
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Description
MH-742B is a universal type intelligent sensor to detect combustible gas,taking advantage of non-dispersive infrared (NDIR) principle. With high selectivity, no oxygen dependence, high performance and long lifespan features, MH-742B also has built-in temperature compensation feature. MH-742B is a compact and high-performance sensor based on infrared absorption of gas detection technology, micro-machining and sophisticated circuit design.
Application
Widely used for industrial field instrumentation, industrial-process control and safety protection
Features
- High sensitivity, high resolution, low power consumption
- Output method: UART, analog voltage signal, etc.
- Quick response
- Temperature compensation, excellent linear output
- Excellent stability, Long lifespan
- Anti-poisons, anti-vapor interference
Specifications
Table 1 Technical Index
| Product Model | MH-742B |
| Gas Detected | Combustible Gas (See Table 2 for details) |
| Working Voltage | 4.5 V ~ 5.5V DC |
| Average Current | < 100mA |
| Interface Level | 3.3V |
| Measurement Range | 0~100%VOL optional (view table 2) |
| Output Signal | UART |
| 0.4-2V DC | |
| Warm-up Time | <2min |
| Response Time | T90 < 30s |
| Working Temperature | -40℃ ~ 70℃ |
| Working Humidity | 0 to 95%RH, non-condensing |
| Dimension | Φ39×44mm |
| Weight | 280g |
| Life span | >5 years |
| Protected Class | IP54 |
Table 2 Measurement Range and Accuracy
| Gas name | Molecular Formula | Range | Resolution | Note |
| Methane | CH4 | 0～5% Vol | 0.01% Vol | Temperature compensation |
| Methane | CH4 | 0～10% Vol | 0.01% Vol | Temperature compensation |
| Methane | CH4 | 0～100% Vol | 0.1% Vol | Temperature compensation |
| Propane | C3H8 | 0～2.1% Vol | 0.01% Vol | Temperature compensation |
| Propane | C3H8 | 0～100% Vol | 0.1% Vol | Temperature compensation |
| Methyl chloride | CH3CL | 0～8.1% Vol | 0.01% Vol | Temperature compensation |
| Methyl chloride | CH3CL | 0～100% Vol | 0.1% Vol | Temperature compensation |
| Acetylene | C2H2 | 0～2.1% Vol | 0.02% Vol | Temperature compensation |
| Propylene | C3H6 | 0～2.0% Vol | 0.02% Vol | Temperature compensation |
| Ethylene | C2H4 | 0～2.7% Vol | 0.027% Vol | Temperature compensation |
| Ethane | CH3CH3 | 0～3.0% Vol | 0.03% Vol | Temperature compensation |
| Iso-butane | C4H10 | 0～1.8% Vol | 0.018% Vol | Temperature compensation |
| Gasoline | C3-C12 | 0～1.1% Vol | 0.01% Vol | Temperature compensation |
| Cyclopentane | C5H10 | 0～1.4% Vol | 0.01% Vol | No temperature compensation |
| Cyclohexane | C6H12 | 0～1.3% Vol | 0.01% Vol | No temperature compensation |
| Methanol | CH3OH | 0～6.7% Vol | 0.06% Vol | No temperature compensation |
| Dichloromethane | CH2CL2 | 0～15% Vol | 0.15% Vol | No temperature compensation |
| Benzene | C6H6 | 0～1.2% Vol | 0.012% Vol | No temperature compensation |
| Toluene | C7H8 | 0～1.2% Vol | 0.012% Vol | No temperature compensation |
| Alcohol | C2H5OH | 0～3.3% Vol | 0.033% Vol | No temperature compensation |
| Ethylene oxide | C2H4O | 0～3.0% Vol | 0.03% Vol | No temperature compensation |
| Epichlorohydrin | C3H5CLO | 0～3.8% Vol | 0.038% Vol | No temperature compensation |
| Ehloropropene | C3H5CL | 0～2.9% Vol | 0.029% Vol | No temperature compensation |
| Pentane | C5H12 | 0～1.4% Vol | 0.014% Vol | No temperature compensation |
| Ethyl acetate | C4H8O2 | 0～2.0% Vol | 0.02% Vol | No temperature compensation |
* The description and specifications might be changed without notice. Please contact us for the latest information before placing orders.
Technical Support:
Customized technical design and function, LOGO and package are available without extra charge (including molding fee) for mass volume.
The sensors don't have sleeping mode. It can be set in program if needed.
All Winsen products go through strict inspections and tests to make sure they are 100% qualified before shipping out.
The sensor has been fully tested (not calibrated) before leaving the factory. However, after transportation and storage, the environment conditions change, and the surface of the sensor absorbs moisture, mixed gas, pollution matters, etc. It is recommended that customers perform aging and calibration after sensors become stable according to the program and use occasions of the whole device.
15﹪-90﹪RH without condensation,greater or less than this range or long-term high temperature and high humidity will affect the life of the sensor.
Our sensors are certified with CE, 3C, ROHS, anti-explosion, fire prevention, and coal mining safety according to different applications. And we provide assistance for new certification.
Many factors can cause the sensor to fail such as broken wires in transportation, poisoning, falling off of the sensitive material, damage to the heating wire (device), etc. Please find specific cause in each category with Winsen’s aftersales.
Winsen provides professional consultation and service before and after sales. We will recommend the best fitting sensor for your demand. If you have any problem, don’t hesitate to email us to sales@winsensor.com
Due to high volume of daily incoming emails and time zone difference, we may not be able to reply your emails immediately. But we will reply to your inquiry in 24 business hours.
