GAS DETECTION


Smart and versatile range of technology takes the hassle out of the toughest gas detection applications


QEL’s Q5 Series smart, toxic, combustible gas sensors and transmitters utilise a wide range of sensing technologies to detect a large variety of gases. These instruments are housed in a NEMA 4X enclosure with an integral buzzer that can overcome the toughest applications.


All models include an LCD display of gas concentration, LED indication of each of the SPDT relays and TX/RX for the RS-485 or Modbus communications. Pre-calibrated sensors can be purchased and installed by the user, thereby reducing calibration costs and minimizing downtime.


Should an operator need to switch from one gas to another, all he or she needs to do is to purchase a sensor and board and then simply install it. Multiple screens can be chosen from the menu that displays data including relay status, time, TWA, STEL and concentration. Programming and calibration is non-proprietary and accessed via a password, selected by the operator, that protects system integrity. These instruments can be installed as stand-alone and digitally networked with QEL or other manufacturers’ controllers through an RS-485 or Modbus communication port that is standard. Equally a 4-20 mA, 2-10 VDC and a 1-5 VDC analog output that is fully assignable over a chosen range is a standard feature. User-programmable relays and a buzzer are also standard enabling several options to energise relays with instant activation upon a pre-selected concentration or it can be activated through a set time to gauge average concentration.


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The new Q-Controller, from QEL, includes features that are unique to the gas detection industry. The system uses an RS-485 communication protocol that accommodates 128 channels through four digital ports. In addition, there are 128 analog inputs from any 4-20 mA device and equally 128 4-20 mA outputs. There are also up to 128 binary inputs and 128 binary outputs.


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Modbus output from the controller is a standard feature as well as an available BACnet IP output. The system communicates wirelessly for programming and downloading of data through your smartphone or tablet device. Input/output boxes can be installed anywhere in the RS-485 network for ease of installation of additional sensors. A touch screen graphic display is used for programming.


All relevant gas detection data, such as relay status, historical data, location and addresses of sensors are displayed by scrolling through multiple screens. The controller has a scheduler that can be programmed to activate relays and deactivate relays several times a day based on a frequency of day, weekday or weekend only. It also has an auto-configure program that searches for connected devices. As the unit can accept any 4-20 mA signal it is ideal for additional monitoring such as temperature humidity and other parameters that may be of interest. Several Q-Controllers can be connected together to a centralized system that will display gas detection concentrations of an entire facility. Remote monitors are an optional item that can be used to observe the concentration of gases prior to entering the space.


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52635pr@reply-direct.com A reliable and versatile solution for refrigerant gas detection


QIRF refrigerant gas detectors are QEL’s second generation proprietary designed transmitter/ sensors. QIRFs are designed to comply with the International Mechanical Code, ASHRAE 15, and B52 demands. These instruments have been assembled to overcome the limitations associated with solid-state sensors.


Infrared technology enables specific gas type refrigerant detection without cross-sensitive interferences. Its sensors are non-contact, non-depleting forms of concentration measurement that have a sensor life exceeding ten years. QIRF’s standard features include a digital display, three user configurable relays, a buzzer, a horn/strobe output and non-intrusive calibration.


Sensor housings are thermally controlled at elevated temperatures to eliminate errors due to


condensate formation and from temperature fluctuations allowing operation in temperatures from -45ºC to +65°C. Each unit can be connected to either the M-Controller or Q4C controller through RS-485 digital communication allowing for cost effective wiring installation. Equally the transmitter is available with 4-20 mA, and Modbus outputs to any Building Automation System (BAS).


Controllers can be equipped with internal and external horns and strobes to alert personnel prior to entering the hazardous area. Both the M-Controller and Q4C are available with M-Net and M-Logger which allows remote monitoring, notification, programming and datalogging features. NEMA 4X enclosures are standard. Calibration procedures are straight forward, non-proprietary and can be performed by any competent technician. Operators can contact QEL to obtain sensors for specific gases.


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QEL have developed the QTS-1300 Series, the latest advancement in low cost analog output oxygen transmitters. The compact sensor elements have a typical life span of two to ten years, are easily field replaceable, and do not require electrolyte replenishment. With rapid response to the target gas and stable zero readings, these sensors retain their sensitivity to oxygen.


The two wire transmitters are available in a variety of ABS or explosion- proof Nema rated enclosures. The transmitter operates on a power supply range of 12-36 VDC with an output of 4-20mA DC into 750 Ohms (at 24 VDC), making it useable with any standard intrinsic safety barrier. With integral RFI and EMI protection, this is the most robust transmitter available in its class.


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A unique approach to digital and analog gas detection control


Simple, safe and


dependable combustible gas detection


The QTS-1710 Series, from QEL, uses catalytic pellistor bead technology to measure combustible gases. The standard sensor is resistant to poisoning substances such as silicones, sulfur compounds and chlorinated compounds. It is mounted in an explosion-proof housing rated Class 1, Division 1, Groups A, B, C, and D.


The transmitter provides a 4-20


mA DC output linear to the LEL (Lower Explosive Limit) of the calibrated combustible gas. The analog transmitter operates on a power supply of 12-30 VDC in a three-wire configuration and is mounted in an explosion-proof housing rated Class 1, Division 1, Groups B, C and D. Test jacks are provided to monitor the transmitter signal without interrupting the output.


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Dependable explosion proof gas detection for the harshest of environments


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QEL’s new Q8 Series of explosion proof gas detectors are used for applications that require a more rugged enclosure and meet Class 1 Division 2 requirements. Each unit comes standard with a digital display of concentration, relay status, STEL, TWA and peak daily value of the gas detected as well as a built-in clock. A three-colour backlight will flash depending on the level of alarm


for operator safety. Set-up and calibration is accomplished through non-intrusive hardware that allows programming of all parameters.


Remote sensors are available for all types of gases and the Q8 Series includes electrochemical, catalytic bead, and infrared technology to meet the demands and performance standards of particular industries. Communication is accomplished through Optomux and Modbus RS-485, 4-20 mA, and 3 user- programmable relay contacts. Remote explosion proof sensing is available for all types of sensing technologies.


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