SGX Europe Sp. z o.o. T: +48 (0) 32 438 4778 Building 11 Ligocka St. 103, E: sales.is sgxsensortech.com 40-568 Katowice, www.sgxsensortech.com Poland IR25 Dual Gas Series Datasheet Infrared Dual Gas Sensor for Mining (Portable and Fixed Systems) The SGX infrared sensors use the proven Non-Dispersive Infrared (NDIR) principle to detect and monitor the presence of gases. With an infrared source and specific filtering on the pyroelectric detectors mounted inside the optical/gas cavity, individual gases or types of gas can be identified and their concentrations determined. These sensors are suitable for reliable monitoring of gas levels in mining applications where the sensor size is restricted and require a flameproof enclosure for hazardous environments. The IR25 Series contain two active detector elements for simultaneous monitoring of Carbon Dioxide and Methane or Hydrocarbon mixtures in the same size housing as some of the single gas sensors from the IR2xxx series sensors, making the sensor more cost effective than two separate sensors. The IR25xx Series share the same build and performance OPERATION standard as the IR15xx Series, but are labelled as being intrinsically safe for methane monitoring in mining To operate, the sensors must be interfaced to a suitable applications. circuit for power supply, output amplification and signal processing. Sensor outputs require linearisation and compensation for ambient temperature variation using APPLICATIONS algorithms in the system firmware. This is necessary for Mining sensors to meet their full performance specification. An embedded temperature sensor facilitates this compensation on certain types. Further compensation for pressure changes FEATURES can also be made in an algorithm, provided there is a For detection of the following gases: suitable input from a pressure sensor. o Carbon Dioxide & Hydrocarbons, o Hydrocarbons Mixtures A set of Application Notes is available from the SGX Gas concentration ranges: Sensortech Ltd website, to explain more about NDIR gas o 0 - 5% Carbon Dioxide sensing and provide advice for the end-user on interfacing (also suitable for 0 to 0.5%v/v) the sensors and processing signals. o 0 - 100% Carbon Dioxide (also suitable for 0 to 10%) TECHNICAL SPECIFICATION o 0 - 100%v/v Hydrocarbons (also suitable for 0 to 100%LEL) Mechanical 19mm sensor height Dimensions See Outlines Embedded thermistor for improved temperature Body material Stainless Steel compensation Approximate Weight 35g Diffused gas sampling via mesh Low power Reference channel for self-compensation Environmental Special gold plated optical gas cavity for stable signal Ambient temperature range levels for operation: -20C to +60C Operational in varying temperature, pressure and storage: -20C to +55C humidity Operational pressure range 30kPa to 130kPa Fast response Humidity range for operation 0 to 95% RH Rugged stainless steel construction and storage (Non-condensing) No moving parts Immunity from poisoning Reliable fail-safe operation Electrical Certified: ATEX & IECEx DC supply to detectors 3V to 5V Typical power 180mW 5V IR Source Supply +5V, 60mA (Recommended) (Square Wave at 4Hz, 50% duty cycle) Whilst SGX has taken care to ensure the accuracy of the information contained herein it accepts no responsibility for the consequences of any use thereof and also reserves the right to change the specification of goods without notice. SGX accepts no liability beyond the set out in its standard conditions of sale in respect of infringement of third party patents arising from the use of SGX products in accordance with information contained herein. In case of modification of the product, SGX disclaims all liability. SGX Europe sp .z o.o. Poland REGON: 362332227 DS-0250, Issue 1, 13-Oct-2016, Page 1 SGX Europe Sp. Z o.o. T: +48 (0) 32 438 4778 Building 11 Ligocka St. 103, E: sales.is sgxsensortech.com 40-568 Katowice, www.sgxsensortech.com Poland CONFIGURATIONS Target Gas 1 Target Gas 2 Sensor Concentration Range * Concentration Range * Application Type Gas Gas Highest Lowest Highest Lowest IR25TT Carbon Dioxide 0 to 5% 0 to 0.5% Hydrocarbons 0 to 100% 0 to 100%LEL Mining IR25TT-M * The Highest Concentration Range is the highest range the sensor is suitable. The Lowest Concentration Range is the lowest range the sensor is suitable. The use of the sensor beyond these ranges will affect the sensors performance. IR25TT The IR25TT can be used for Mining applications to monitor of both relatively low concentrations of carbon dioxide and simultaneous %LEL and %v/v concentrations of methane. The sensor contains a broadband hydrocarbon detector which is less cross sensitive to other hydrocarbons but does have a slightly higher response to humidity, when compared with the IR15TT-M. IR25TT-M The IR25TT-M is very similar to the IR25TT except that a narrowband hydrocarbon detector is used. The narrowband detector has a slightly lower response to humidity than the IR25TT, but is generally more cross-sensitive to other hydrocarbons. HANDLING PRECAUTIONS 1. Do not allow sensors to fall on the floor. This could cause IR Source filament breakage, damage to the pins and the gas entrance aperture. 2. Do not apply mechanical force against the gas entrance aperture. 3. Do not immerse sensors in water or other fluids. 4. Protect the gas entrance aperture against dust ingress and sprayed materials. 5. Anti-static handling precautions must be taken. PERFORMANCE For test purposes, all data taken using the following conditions: - Performance as tested in the SGX IR-EK2 Evaluation Kit directly after calibration. - SGX linearisation and temperature compensation algorithms applied see Infrared Sensor Application Notes. - IR Source Voltage 5V, square wave, at 4 Hz and 50% duty cycle. Running the IR Source at 3V will decrease performance due to lower output signals. - Ambient temperature (20C) and pressure (101 kPa). - All gases diluted in dry nitrogen. - Performance for the Hydrocarbons refers to Methane only. Most other hydrocarbons will have an improved performance. - Performance data is the same for the supported IR Source variants ( 1 variants). - Refer to Application Notes for more information. Sensor type IR25TT IR25TT-M (5) (5) Gas CO Methane / Hydrocarbons CO Methane / Hydrocarbons 2 2 Concentration Range Refer to Configurations Table <20 sec to operate Warm-up Times <60 sec for Zero 1% of Full Scale, (1) Maximum Response Time (T ) 20 sec 90 (2) Peak-to-Peak Outputs (in N ) 2 10 to 29 24 to 58 10 to 29 12 to 47 Active (mV): Reference (mV): 18 to 43 18 to 43 SGX Sensortech 2016 Document subject to disclaimer on page 1 DS-0250, Issue 1, 13-Oct-2016, Page 2