Combustible gas concentration detector
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Combustible gas detectors are detectors for single or multiple combustible gas concentrations. Combustible gas detectors are catalytic, infrared optical two types.
Edit Summary This entry is not yet perfect, welcome to edit the entries, contribute their professional knowledge! Catalytic combustible gas detector combustible gas detector is the use of refractory metals platinum wire heating after the change in resistance to determine the concentration of combustible gases. When the combustible gas into the detector, in platinum wire surface caused by oxidation reaction (flameless combustion), the heat generated by the temperature of platinum wire, and platinum wire resistivity will change. Infrared optical type is the use of infrared sensors through the absorption of infrared light source to detect the scene of the environment of hydrocarbon combustible gas! Alkanes combustible gas detector durable, easy to operate intelligent combustible gas detector, designed to detect flammable gas hydrocarbons in the lower explosion limit concentration of 0 to 100% change. The detector uses a patented "small plug-in replaceable" infrared optical sensor. Infrared sensor is characterized by a long period of work stability and minimal phased maintenance. Infrared gas sensors are an excellent alternative to conventional catalytic combustion sensors in certain measurement environments. Infrared combustible gas detectors are ideal for the following applications: Frequent catalytic gas exposure Frequent high flammable gas emissions Anoxic environments Detection of difficult to achieve environments Typical applications Offshore platforms and drilling platforms Refining Plant Petrochemical plant Compressed natural gas and liquefied gas treatment Wastewater treatment Chemical plant Pump station Thermal power plant Features Unique small plug-in field-replaceable sensor No interference, intelligent detector interface Output: 4-20mA, RS-485 data bus and 3 alarm relays Minimal maintenance requirements Heated optical design to avoid condensation Fault self-diagnostic function Low-cost long-term use Five-year rated cost of quality assurance Low energy consumption features Unique Small, plug-in, field-replaceable sensors No interference, intelligent detector interface Outputs: 4-20mA Minimal maintenance requirements Heating optics to avoid condensation Fault self-diagnostics Long-term cost Five Year of the rated cost of quality assurance low-energy combustible gas detector is methane as the standard gas field calibration and software debugging. The company can also do other gas samples, but the customer must be declared in advance when ordering. The following table shows the calibration gases that the company now offers: Methane Ethane Propane Butane Pentane Heptane Heptane Ethylene Propylene Butylene Pentylene Hexene Cyclohexane Cyclohexene Cyclohexene Pinene Toluene Xylene Methanol ethanol, propanol, isobutanol dimethylamine, trimethylamine pyridine dimethyl ether ether vinyl ether, tetrahydrofuran, dioxane, ethylene oxide acetone butanone amyl ketone and methyl isobutyl ketone heptanone MicroSafe infrared combustible gas detector technical characteristics 1, Introduction Detcon's MicroSafe technology infrared combustible gas detectors are non-intrusive intelligent products, with good safety performance, easy operation and flexible. A key feature of this detector is its auto-calibration function, which guides the operator step-by-step through a prompt on the backlit LCD screen. 600 series of infrared gas detectors provide three different output: analog signal 4 ~ 20mA RS-485 communication interface and three relays (two alarms, a fault self-test). Can be on-site debugging and programming. These different output modes provide the greatest flexibility for system building. 500 series only provide 4 ~ 20MA DC output. The control circuit is based on a microprocessor chip, packaged as a plug-in module and attached to a standard connection module. Sensor and signal generator is installed in an explosion-proof enclosure, the case has a glass cover. A digital display with backlighting can display sensor readings as well as display menu functions when programmed. All infrared gas detectors belong to the electrical classification: Class Groups B, C, This product line extends Detcon's "easy to install, easy to maintain" concept in gas sensor design. 2, no interference package Detector is packaged in explosion-proof metal housing. A glass-covered lid is attached to the housing. The magnetic programming button located on the transmitter panel can be operated by a hand-held magnetic programming tool, which ensures uninterrupted operation of the sensor interface. All calibration and field commissioning can be carried out without opening the cover and maintaining the original state on site. 3, easy calibration with a backlight on the LCD display calibration tips, greatly simplifying the calibration steps. The technician can simply start the calibration procedure with the magnetic programming tool. Once the calibration procedure is initiated, the detector displays the calibration menu, which provides both zero and start calibration options. Select ZERO will start auto-zero function. The calibration end display reverts to the calibration menu. The SPAN will start the automatic start-up state calibration, and the display will ask for the gas and its concentration set by the detector. As soon as the gas is supplied, the detector automatically starts the calibration. When the signal stabilizes, the detector records the starting data and prompts the operator to disconnect the air supply. Once the gas concentration is zero, the detector will automatically continue its normal operation. If, for any reason, the detector can not perform the calibration procedure, the detector displays an error message. This process takes less than three minutes and is almost never go wrong. 4, the signal output 600 infrared gas sensor has two kinds of signal output: analog 4 ~ 20mA output and RS-485 data bus output. While the 500 is only a 4 ~ 20mA output. The output signal is a linear analogue signal of 4 to 20 mA associated with the detection range. This signal is compatible with Detcon's Series 10 and Series 12 multimodule controllers, programmable logic controllers, and other standard data acquisition devices. The analog outputs have two other functions. First, when entering the calibration menu, the 4 ~ 20mA signal will drop to 2mA. The low current will remain until the sensor returns to normal operation. Second, once the error, 4 ~ 20mA signal will be reduced to 0mA, the situation will remain to the error state back to normal. Changes in these output signals can be used by external devices to identify and record the operating status of the sensor. RS-485 data communication using Modbus RTU protocol, this agreement with almost all of the programmable logic controller, human-machine interface software and other control systems compatible. Because the Modbus RTU protocol is a standard. The following information is available from the RS-485 communication interface: Detector reading, detector alarm point, calibration mode, detector error, two alarm statuses, and calibration program errors. The address of the RS-485 can be changed by DIP switch. Communication is a two-wire, half-duplex, there is a 600-type detector as its servo device. Theoretically, the main controller can simultaneously control 256 different 600 detectors at 4000 feet. 5, alarm features 600 infrared gas detector with three relays, two responsible for the alarm, one is responsible for self-test failure. 500 without relays. All three alarms can be switched to the following operating states via a jumper: contact status (either normally open or normally closed), and the relay can be adjusted to continuously energize or de-energize continuously. In addition, the alarm can also be muted. Alarm point can be adjusted through the menu. The self-test siren can also be muted via the menu and reacts to zero drift below -10% of the measuring range, microprocessor error, infrared light source error, signal parameter error, or any other impediment to normal calibration situation. The relay contacts are rated for 5 amps at 250 volts ac and 5 amps at 30 volts dc. 6, programming state programming status function allows the user to use the magnetic programming tool in the menu "VIEW PROGRAMMING STATUS" (that is, see the programming state) to set the sensor alarm point, RS ~ 485 identification number, detection gas and measurement range. Once in the program, the display will automatically flip to complete all the debugging steps. At the end, the sensor will return to normal operation. 7, Overrange Range When the gas concentration measured by the detector exceeds 100% of the measurement range LEL, the display will flash and display the highest value. When the gas concentration returns to the measuring range, the display will return to normal operation. DETCON catalytic combustion type gas detectors for monitoring combustible gases in ambient air from 0 ~ 100% LEL range of variations. The sensor uses catalytic combustion technology, the sensor can be replaced in the field. Catalytic combustion sensor for a wide range of flammable gases have a keen response. The technology for combustible gas has universal applicability. The DETCON sensor is specifically designed to provide protection against poisoning and is capable of reliable operation in most industrial environments for five to ten years. Electrolytic Polishing 316SS Stainless Steel Construction 100% Epoxy Resin Encapsulated Circuit I / O Input / Output Multilayer Protection (Overvoltage, Wiring Fault, EMI / Radio Wave Interference) Waterproof, Anti-Corrosion, Anti-Vibration Modular Designed for easy maintenance Modular design Plug-and-play components Minimal components (universal design concept) Fast thread removal (for sensor replacement) Integrated calibration interface Specifications: Detection principle Catalytic combustion range 0-100% LEL accuracy 0.5% LEL 5% Response time T50 10s T90 30s Ambient temperature -40 C to 75 C Ambient humidity 0-100% RH (non-condensing) Signal output 4-20mA, RS-485 Power input 11.5-28VDC Power consumption 24VDC 2W Electrical and explosion-proof class Class Division Groups B, C, EX dIICT6 Safety certification CSA / NRTL (US OSHA certification) Quality assurance sensor: 2 years RVVP (3 * 1.5MM2): 2-year transportation Packing size 12.5 " 9.5" 8 "Cable interface 3/4" NPT female thread Cable diameter and transmission distance RVVP (3 * 1MM2) : RVVP (3 * 2.5MM2): Detector Weight / With Package Weight 4 lb / 5 lbFig
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