The low-power infrared (4R NDIR) detector is an industrial gas detector used for the real-time detection of gas concentration changedeveloped by Intersense Shanghai independently according to the international demands and with the non-dispersive infrared detection technology (NDIR) and the LED low-power design. Our infrared detector R&D team gets the technical talents with rich knowledge and experience in design, manufacturing and application of infrared gas detector together. The relevant R&D personnel have more than 10-year work experience, and have been dedicated to the gas detection field for many years, and accumulated rich practical experience.
Compared with the catalytic combustion detector, our 4R NDIR detector is featured with good signal to noise ratio, resistance to cross gas interference, high precision, long-term good stability, high product conformity and long service life, etc. The 5-plug design of the product is compatible with the simulation voltage and digital serial output, has obtained the European and US intrinsic safety and explosion-proof certifications, and can avoid the risks in the current product design to the maximum extent, and be widely used in various detection applications. Therefore, this is a low-power infrared detector with the extremely high cost performance.
Product features
Application field
Meanwhile, the infrared detector is very sensitive to the humidity so it is prone to moisture condensation in the rainy weather or when the temperature between day and night is large, and the moisture condensation will affect the reflection of optical path, resulting in the wrong gas detection and the wrong warning. For this characteristic, our low-power infrared detector integrates the temperature parameters, and makes a breakthrough in the humidity parameters to make sure that no warning is given in case of moisture condensation and the normal response is made when there is the target gas. Therefore, this product can be widely used in the municipal gas facilities, underground pipelines, coal mine warning, oil and gas recovery, petroleum and petrochemical, winery security monitoring, petrol stations and other fields.
Technical parameters
| Operating voltage | 3.0~5.5V d.c | Operating current | Average current <0.8mA, Peak value <10 mA |
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| Operating temperature | -20~60℃, expandable temperature: -40~70℃ | Operating humidity | 0~95 % RH (non-condensation) | ||||
| Storage temperature | 0~40℃ (recommended) | Operating pressure | 800~1200 mbar | ||||
| Weight | About 8g | Size | 4R Size | ||||
| Service life | 5 years (in the clean room-temperature environment) | Optical coating | High reflective metal-coated film | ||||
| Target gas | Methane CH4 |
Methane CH4 |
Propane C3H8 |
CO2 CO2 |
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| Measuring range | 0-5% Vol (0-100%LEL) |
0-100%Vol | 0-2.2% Vol (0-100%LEL) |
0-5000ppm | 0-5%vol | 0-20%vol | 0-100%vol |
| Resolution * | 50 ppm | 100 ppm | 20 ppm | 10ppm or 0.2% of indication | |||
| Preheating time | ≤60s | Response time | T90≤15s | ||||
| Linear precision * | ±3% full range or ±5% indication | Repeatability | ±1% full range or ±2% indication | ||||
| Long-term stability * | Monthly drift: ±2% of full range or ±5% of reading. | Measuring interval | One sampling point every second (1Hz) | ||||
| Humidity characteristic | Relative to the 50%RH drift: ±2% of full range or ±15% of reading. | ||||||
| Temperature characteristic | Deviation of reading relative to 25℃: ±2 of full range or ±10% of reading in the -20℃~50℃ range; ±4% of full range or ±20% in other working temperature range |
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| Automatic baseline calibration | The default period is 168 hours. If turn-off or period adjustment is needed, please indicate on your order (if the target gas is in the service environment for a long period, it is suggested to turn off this function) | ||||||
| Serial baud rate | 9600,19200,38400,57600(default) | ||||||
| Output form | Support the digital and simulation output (refer to the 0.4-2V output characteristic shown on the following diagram), with the concentration subject to temperature, humidity and linearity compensation, expressed in ppm | ||||||
| Intrinsic safety certification | Ex ia op is iic Ga; Ex ia op is I Ma | ||||||
| Intrinsic safety parameter | Ui=6Vdc, Ii=2A, Pi=1.2W, Ci=0µF, Li=0µH, -40℃≤Tamb≤+60℃ | ||||||
| Certification standards | IEC 60079-0:2017; IEC 60079-11:201; IEC 60079-28:2015; EN IEC 60079-0:2018 EN 60079-11:2012; EN 60079-28:2015 |
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Notes: (1) The resolution, precision and long-term performance test conditions are 20℃, 50%RH, 1013mBar.
(2) For the long-term performance test, the detector works continuously for 22 days, 8 hours every day.
Characteristic curve
Notices for product application
4R NDIR detector is a kind of optical detector. The optical path directly affects the performance of the detector so the use of detector shall avoid squeezing or polluting the optical path face. (1) Never tear off the white dustproof film at the top of the detector to prevent the external dust and dirt from entering the optical chamber of the detector and thus affecting the detector performance; (2) avoid squeezing the top of detector, for fear of deforming the optical path of the detector.
Operating environment
This sensor can be used under a wide environmental conditions, including some bad environments. However, for the validity and stability of the detector, it shall be exposed in the high-concentration solvent vapor during its storage, installation and operation. Otherwise, the solvent may corrode the metal coating and thus affect the performance of the detector. When the printed circuit board is used, the use of degreaser is suggested before installing the detector. It is not suggested to directly put the solvent on or near the detector, in order to avoid plastic cracking due to the solvent.
Safety test
This detector is used in the key safety protection and warning fields. To ensure the normal operation of the detector in the instrument during every application, the customer is suggested to expose the instrument in the target gas for simultaneous test and verification before use. If the verification fails, the detector shall not be used, for fear of causing the safety damage of personnel and property.