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                                Gas Detection and Monitoring

Six Sensor Technologies  

Detcon industrial gas detection products include the use of all six conventional gas sensor technologies. This capability is mandatory in today's complex industrial market. Command of each of these technologies enables us to "fit the correct product to the application", and assure long term service and reliability.

Solid State MOS (H₂S)

Detcon's unique and patented sensor for the detection of hydrogen sulfide gas. The most robust sensor on the market. Supported by a 10 year conditional warranty. Impervious to high moisture and high range concentrations of H2S and other acid gases.

Method of Detection is by diffusion/ adsorption. Air and gas diffuse through a sintered stainless steel filter and contact the heated surface of the metal oxide sensor film. As Hydrogen Sulfide gas reacts with oxygen ions on the film, there is a decrease in electrical resistance proportional to the gas concentration. The heater film elevates the temperature of the sensor film creating convection and promoting a quick response to changing gas concentrations. This heater film is electronically controlled to maintain a constant temperature at the sensor film, thus enhancing stability and repeatability, and eliminating the need for temperature compensation of the output. The sensor response is reversible and results in continuous monitoring of ambient air conditions.

Catalytic Detectors (non-selective combustible gases)

Proprietary poison resistant catalytic detector beads for the detection of combustible gas in the lower explosive limit ranges (LEL). Detector life expectancy is 3 to 5 years and is supported by a 2 year warranty.

Method of detection is by diffusion/adsorption. Air and gas diffuse through a sintered stainless steel filter and contact both the active and reference detector beads. The heated surface of the active detector promotes oxidation of the combustible gas molecule while the reference detector serves to maintain zero stability over a wide range of environmental conditions. When the combustible gas molecules are oxidized on the active detector, incremental heat is generated and its resistance changes. Changes in resistance is accurately measured using a Wheatstone bridge circuit.

Two Electrode Air Battery (Oxygen deficiency)

Temperature compensated two-electrode air battery type cell for the detection of oxygen in the range of 0 to 25% by volume. A rugged plug-in replaceable sensor with a life expectancy of 2 years.

Method of detection is by controlled rate of diffusion. Oxygen first diffuses through a sintered stainless steel filter and then through the sensor's gas permeable diffusion membrane. At the sensor's electrode/electrolyte interface, oxygen is reduced and a corresponding current is generated between the cathode and anode electrodes. The lead anode is converted to lead oxide as current flows through the sensor. The current output is an exactly linear function of the oxygen gas concentration. The quick response of the sensor results in continuous monitoring of ambient air or process oxygen conditions.

Three Electrode Electrochemical Cells (toxic gases)

Disposable electrochemical sensors for the detection and monitoring of a long list of toxic gases in a variety of industries. detection ranges from part-per-billion to several hundred parts-per-million gas concentrations. Life expectancy of up to 3 years. NH3, HCN, N02, N0, C0, H2S, S02, CL2, CL02, HCL, H2, PH3, HF, 03,VOCs and many more.

Air and target gas diffuse through the diffusion barrier to reach the sensing electrode. the controlling circuit maintains an external voltage between the sensing and counter electrodes sufficient to drive the electrochemical reaction. the electrochemical reaction with the target gas generates a current flow between the sensing and counter electrodes. This circuit also provides a specific bias potential between the reference and the sensor electrodes in such a manner that no current flows between them. The quick response of the sensor results in continuous monitoring of ambient air conditions.

Infrared Optical (hydrocarbon and carbon dioxide)

A very compact plug-in optical detector assembly for the monitoring of combustible hydrocarbons (HC) and carbon dioxide (C02). Low power combustion, heated optical chamber, temperature compensated, long life expectancy and a 5 year warranty on the optical detector.

IR sensors operate on the principle of infrared light absorption as a means to detect the presence of combustible hydrocarbon gases. The Detcon IR sensor uses a miniature plug-in optical detector in a stainless steel housing. The target gas diffuses through a sintered stainless steel flame arrestor and into an optical cavity. A lamp provides a cyclical IR radiation source that contacts two pyro-electric detectors. These "active and "reference" detectors each give an output that measures the intensity of of the radiation contacting their surface. The active detector is covered with a filter specific to the IR spectrum where hydrocarbons absorb the reference detector has a filter specific to the non-absorbing part of the IR spectrum. Hydrocarbon gases absorb a fraction of the IR radiation and the detector signal decreases. The reference detector remains unchanged in the presence of the target gas. The ratio of the active and reference detector signals is used to compute the gas concentration. By using the ratio, drift caused by changes in the lamp intensity or optic reflectivity is eliminated

Photo Ionization for VOC Compounds

Detcon Photo Ionization sensors are non-intrusive “Smart” sensors that use photo-ionization detector technology to monitor VOC gases over ranges from 0-10ppm to 0-5,000ppm. In the PI sensor design, Detcon has successfully converted the sensitive laboratory style PID technology into a rugged, environmentally insensitive, and long-life industrial gas sensor. The sensor assembly consists of a plug-in replaceable miniature PID sensor in a stainless steel housing, a plug-in control transmitter circuit, a base connector board and an explosion proof enclosure.

                                       Datasheets to download

Gas Detection and Monitoring

NEW!

Detcon Model Series 700 "Environmentally Bulletproof" Gas Detection Sensors.

Multi-layer surge protection, water-proof, corrosion-proof, Vibration proof!

Series 700 industrial gas detection sensors are a new generation of intelligent sensor modules that incorporate and integrate several leading edge improvements. The sensors are specifically designed for harsh and extreme locations. his new and superior level of environmental durability in sensor design includes an electro-polished 316 stainless steel housing, multi-layer transient spike protection circuitry and 100% encapsulated electronics. The sensor electronics are completely protected and immune to water ingress and corrosion. The gas detector sensor elements are all plug-in components and can easily be replaced in the field. Operator interface is non-intrusive via a small handheld magnet. Configuration and routine calibration is intuitive and menu driven with fully scripted instructions. Sensor status is displayed on a built-in alpha-numeric LED display. Series 700 intelligent sensor modules feature dual redundant outputs, a linear 4-20 maDC analogue signal and a Modbus RS-485 serial output.

It is becoming increasingly important that safety systems meet the Safety Integrity Level (SIL) requirements of IEC 61508 and IEC 61511. The SIL rating can only be determined by considering the complete safety system. The Detcon 700 series sensor modules are designed with this in mind and feature a new and unmatched level of pre-emptive fault diagnostics. Application variables like input voltage range, operating temperature, maintenance schedule, detector reliability and output integrity are all monitored and reported via the 4-20 mA and RS 485 serial output. As a component of a SIL rated system, the Safe Failure Fraction (SFF) of Detcon Series 700 are designed to meet the requiremens of any SIL 2 rated system.

Model Series 100 - Standard 4-20 ma DC Output

Detcon Model DM-100 sensor consists of an Intelligent Sensor Module and a Universal Transmitter packaged in an ABS plastic housing and a molded fiberglass sensor enclosure.

Nema 4X weatherproof enclosure  - 2 wire loop powered

UniTox Model Series 200 - Universal transmitter module with intelligent Sensor Module

Detcon Model DM-200 sensor consists of an Intelligent Sensor Module and a Universal Transmitter packaged in a molded fiberglass enclosure. Its universal design allows complete interchangeability of  any Intelligent Sensor Module resulting in reduced maintenance costs.

Intrinsically safe design - Nema 4X weatherproof enclosure - CSA Approved Class 1, Div. 1, Groups A,B,C,D - 2 wire loop powered - PLUG & PLAY field exchangable Intelligent Sensor Module - Modules for up to 40 different gases - Non-Intrusive and simple menu interface - Built-in system diagnostics.

Model Series 400

Detcon series 400 sensor assembly consists of a sensor in a stainless steel housing, a plug in control transmitter circuit, a base connector board and an explosion-proof enclosure.

CSA Approved Class 1, Div. 1, Groups A,B,C,D - 2 wire loop powered - Field replaceable transmitter and sensor - 4-20 mA output standard

"Microsafe" Model Series 500 Intelligent Sensor

Detcon series 500 "SMART" sensor assembly consists of a sensor in a stainless steel housing, a plug in control transmitter circuit, a base connector board and an explosion-proof enclosure.

CSA Approved Class 1, Div. 1, Groups B,C,D - 2 wire loop powered - Field replaceable transmitter and sensor - 4-20 mA output standard - Simple menu driven calibration takes less than 3 minutes to perform - Back-lit LCD and LED indicators for FAULT and CAL status

"Microsafe" Model Series 600 Intelligent Sensor - RS485 Addressable

Detcon series 600 "SMART" sensor assembly consists of a sensor in a stainless steel housing, a plug in control transmitter circuit, a base connector board and an explosion-proof enclosure.

CSA Approved Class 1, Div. 1, Groups B,C,D - Compatible with PLCs, SCADA, DCS or a variety of host controllers via 4-20mADC, and/or RS-486, and /or alarm relays - Sensor status and parameters accessible via RS-485 MODBUS - Menu programmable relays standard (two alarms per fault) 2 wire loop powered - Field replaceable transmitter and sensor - 4-20 mA output standard - Simple menu driven calibration takes less than 3 minutes to perform - Back-lit LCD and LED indicators for FAULT and CAL status

Sensor Accessories

Detcon provides a wide range of accessories to facilitate installation, calibration and operation.

Control Systems - Single Sensor Control Modules and Systems

Model 10 cards feature 2 Gas Level Alarm and Fault alarms Model 12 cards feature 3 Gas Level Alarms and Fault alarms. Both series feature 4-20 mA input and output, RS-485 output, digital display of gas concentration and fail safe fault supervision.

Detcon Model 810 rack/panel mounted control enclosure, along with Model 10 or 12 digital control cards, is designed to serve as a host control system for remote mount gas detection sensor assemblies. The single channel modular design can be configured for any combination of gases. All control modules are plug in front panel accessible for easy maintenance and repair. The 810 features an integral 80 watt power supply. 1 to 8 channel configurable, status and parameters are accessible via RS-485 MODBUS and compatible with PLCs, SCADA, and DCS.

Detcon Model 610FB control enclosure, along with Model 10 or 12 digital control modules, is designed to serve as a host control system for remote mount gas detection sensor assemblies. The single channel modular design can be configured for any combination of gases. All control modules are plug-in front accessible for easy maintenance and repair. A blank plate can be installed on any unused channel until that channel is needed at some future date. The model 610FB includes an integral power supply. A power on/off switch and line power fuses are front panel accessible.

Detcon Model 440 is a microprocessor based local programmable controller that can receive up to 4 analogue and/or digital logic inputs. The status of the inputs are displayed on the back-lit LCD which provides a 20 character line display for each input. Typical status indications include type of detection and current readings. Front panel alarm LEDs and common alarm relay outputs (form "C" dry contacts) are provided for three alarms plus fault. An RS-485 serial output is provided for remote computers or monitoring devices.

The controller includes a 120 VAC or 24 VDC power supply. The enclosure is rated NEMA 4 location and is designed for installation in small buildings. The remote mount sensors, which are purchased separately, can include any 4-20mA input device such as toxic gas, combustible gas, or Oxygen depletion sensors, or any digital logic input such as liquid level, smoke, heat, etc. Additional features include an alarm inhibiting calibration switch and an alarm reset switch. The controller design facilitates easy, low cost installation and simplified periodic maintenance.

System Integration

Detcon Model Series X40  systems are a family of control products that supervise from 1 to 8 inputs, display the real time status of each input and output critical action in accordance with user configurable requirements. Each system is housed in a NEMA 4X weatherproof enclosure. The product series include Model 140X-NX4, Model 240-N4X, Model 440-N4X and Model 840-N4X. The design is a microprocessor based control circuit that can supervise and display the condition of virtually any type of any type of field mounted gas detection sensor or process instrument. Gas sensor types include combustible gases, oxygen deficiency and more than 40 toxic compounds. Additional safety devices such as stand alone thermal detectors, smoke detectors, and flame detectors can also be incorporated into a system application. The controller is completely user programmable. A back-lit alpha/numeric display provides real time reading and status for each field device. This display is also used to provide simple menu driven operator interface during system programming including type of input, range of sensitivity, alarm level adjustment and alarm relay configuration. One of the unique features of Model X40 control systems is logging and alarm history. Historical calibration and alarm data can be displayed on the LCD or the data can be down loaded to a PC via the RS-232 serial port.

Detcon Model 1600 and 6400 are multi-channel gas alarm control systems utilizing distributed I/O as the foundation for application and installation flexibility. Model 1600 can be programmed for up to 16 sensor inputs and the Model 6400 to 64 inputs. System features include display of real time readings, complete device status, and an almost limitless number of alarm relay outputs. The main CPU functions as a MODBUS Master and can be configured to poll any combination of addressable field devices and addressable analog input modules.

The status of each active input is displayed on a back-lit touch screen that also serves as a user interface. Typical input status indication includes channel number, tag name, gas type, concentration and alarm status. Each input can be configured for up to 3 alarm levels. A fourth alarm is fault detection integral to the system and any reported error from intelligent field devices. Each system design can consist of either common or discrete alarm relays or a combination of both. RS-485 or RS-232 serial output is provided for communications with PLCs, PCs, DCS and SCADA systems.

Model 1600/6400 controllers feature a modular design that allows the user to customize their standard input/output modules. Four standard modules are available: 4 channel 4-20 mA input, 4 channel contact input, 4 channel contact output, and a 4 channel 4-20 mA output module. Modules are designed for stackable DIN rail mounting, which allows for seamless system expansion. These addressable modules may be housed internal to the main system enclosure or they may be packaged for remote mounting in a separate enclosure suitable for the area classification in which they are to be installed. The remote mounting option can in some cases significantly reduce wiring and installation cost.

The control system can be powered by 110/220 VAC or 11.5 to 30 VDC. The system is available in NEMA 1 panel or wall mount enclosures, NEMA 4X weatherproof enclosures or NEMA 7 explosion-proof enclosures. Detcon's full range of gas sensors, which are purchased separately, can be mixed and matched to create a gas detection system consisting of toxic gas, combustible gas, or Oxygen deficiency. A wide range of field devices such as liquid level, temperature, pressure, flow, et. can be configured for input to the control system. Alarm control features one-touch Alarm inhibit, Alarm Reset, and Alarm Silence (Acknowledge) functions.

Detcon Model 1600/6400 controllers provide a unique combination of user programming flexibility and customizable expansion capability, in a low-cost and simple to operate package.

Gas Analyzers

Detcon Model Series 1000 process analyzers provide continuous real time measurement of H2S, CO2, Mercaptan, etc. Applications include natural gas pipelines, tail gas, SRU overhead gas lines as well as many other applications. The systems can be provided with manual calibration or with microprocessor-controlled automatic calibration. The analyzer features a microprocessor based signal conditioning transmitter with local digital display, fault supervision, calibration mode indicator, alarm relays and an RS 485 port.The instrument package is rated for use in electrically classified areas: Class 1; Div. 1; Groups B,C,D. Line power, battery and solar powered models area available.