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Summary of Contents for Simtronics SIMRAD GD10P
- Page 1 SIMRAD GD10P - IR GAS DETECTOR OPERATING MANUAL P3359E 8th edition - November 2005 Simtronics ASA – Kabelgaten 4B – P.O. Box 314, Økern – NO-0511 OSLO, NORWAY Phone +47 22 64 50 55 – Fax +47 22 66 60 01 mail@simtronics.no www.simtronics.eu...
- Page 3 TABLE OF CONTENTS PRODUCT DESCRIPTION..............3 ..............3 ENERAL DESCRIPTION .................4 ONSTRUCTION ................4 PPLICATION AREAS (0-100% LEL ) .5 ECHNICAL DATA METHANE RESPONSE TIME ............7 ERTIFICATION AND TANDARDS ..................8 ERTIFICATES ............8 RODUCT IDENTIFICATION LABEL INSTALLATION..................9 GD10P..............9 OUNTING THE 2.1.1 Location ..................9 2.1.2 Ventilation duct or pipe mounting ..........9 2.1.3 Orientation................11...
- Page 4 ..............24 AS DETECTION SYSTEM ORDERING INFORMATION............25 ................26 PARE ARTS TABLE OF FIGURES GD10P, ) .......... 7 IGURE OUTLINE DIMENSIONS .............. 8 IGURE DENTIFICATION LABEL IGURE ENTILATION DUCT OR PIPE MOUNTING USING OUNTING ..... 10 LANGE EFER TO IGURE FOR DETAILS ......
- Page 5 PRODUCT DESCRIPTION General description The Simrad GD10P Gas Detector is a point detector for gas concentration monitoring in potentially hazardous and/or poisonous environments. The GD10P is based on infrared absorption and uses the latest developments in analogue and microprocessor technology.
- Page 6 Construction A complete GD10P Gas Detector consists of the following: An external gas measuring path where gas is measured by monitoring absorption of IR radiation. A weather protection enclosure is mounted around the measuring path to protect the optical surfaces from rain and dust and other contaminants.
- Page 7 Technical data (0-100% LEL methane, 5 sec. response time) Specification for other types on request Detection range, standard 0-100% LEL (0-5% Vol.) methane - Option 0-100% Vol. methane - Option Other gases on request Better than ±5% of full scale reading Long-term stability Better than ±3% of full scale between Accuracy, standard 5 sec.
- Page 8 - Electrical connection 3 wires (M20 EExe cable gland) Temperature range: - Storage -40°C to +70°C - Operating -20°C to +45°C - Operating (option) -40°C to +60°C - Humidity (operation) 99% RH non-condensing Explosion-proof housing: - Main compartment EExd IIC T6 - Terminal compartment EExe Protection category...
- Page 9 Figure 1.1 GD10P, outline dimensions (mm) Certification and Standards The GD10P has been certified according to: Atex Directive 94/9/EC, EMC Directive 89/336/EEC Article 4 and requirements laid down by the following standards: EN50014/IEC 60079-0 Electrical apparatus for potentially explosive atmospheres.General requirements.
- Page 10 measurement of flammable gases. Part 1: General requirements and test methods. EN 61779-4/IEC 61779-4 Electrical apparatus for the detection and measurement of flammable gases. Part 4: Performance requirements for Group II apparatus indicating a volume fraction up to 100 % lower explosive limit. EN 50081-1 Electromagnetic compatibility –...
- Page 11 NOTE: The detector must always be used with the Weather Protection or Sample Flow Housing mounted. Exception to this must be discussed with Simtronics. 2.1.2 Ventilation duct or pipe mounting If installed in a ventilation duct or pipe, the mounting arrangement and accessories shown in Figure 2.1 and 2.2 should be used.
- Page 12 In order to achieve minimum response time, the Weather Protection must be oriented with the flow direction indicator facing into the air flow. See procedure in section 2.1.3. The sensor must be mounted in straight parts of the duct with undisturbed airflow.
- Page 13 Figure 2.2 Exploded view, Duct Mount Flange Kit 2.1.3 Orientation The detector should be mounted so that the longitudinal axis of the detector is horizontal. This will prevent accumulation of water and dust on the optics. The Weather Protection must always be oriented correctly for optimal performance.
- Page 14 2.1.4 Mounting the GD10P The detector is mounted by means of a projecting mounting leg using two M8 screws and washers, or by means of the Duct Mounting Flange Kit (4 x M8 screws). Weather Protection M8 screw Figure 2.4 GD10P mounted by means of mounting feet Electrical connections 2.2.1...
- Page 15 Local earth fixing Terminal 1 +24 VDC Figure 2.5 Terminal compartment Terminal 2 24 V return (0 V) Terminal 3 4-20 mA output Terminal 4 Factory use only Terminal 5 Factory use only 2.2.2 Output cable connections The detector has two output modes: Current source 4-20 mA (standard) Current sink 4 - 20 mA (option) The mode is factory set, and shown on the identification plate of the...
- Page 16 NOTE: As signal levels, polarity, loading, stability and fault testing differ between manufacturers of catalytic modules, Simtronics must be contacted for correct setting of variables in the Bridge Interface. Figure 2.6 Bridge interface installation 2.2.2.4...
- Page 17 It is recommended to use shielded cables. Cables should be of a fine multi-strand type with a cross-section between 0.5 mm and 1.5 mm The cable enters the terminal compartment via an EExe cable gland. Several options of gland fittings are available. 2.2.2.5 Initial wiring checks After wiring as detailed above, and before applying power, ensure that:...
- Page 18 OPERATION Start-up procedure Ensure that system wiring and control system are in working order before switching on power to the detector. The detector will then perform self-test and internal signal adjustments lasting for approx. 60 seconds and switch to measuring mode. The output signal from the detector during this period is shown in Figure 3.1 below (current output of the GD10P standard version).
- Page 19 MAINTENANCE NOTE: The GD10P has no user adjustable parts. It is not recommended to open the GD10P, as this will change the internal atmosphere, and the initial calibration could be affected. NOTE: Opening the GD10P voids all warrantee offered at time of sale. General The GD10P has been designed to require a minimum of maintenance.
- Page 20 • If there is an air movement of 0.5 m/sec., the test gas flow must be increased to 20 litres/minute to show the same value. • At high air velocities, when it is difficult to obtain sufficient output using test gas in the LEL area, a test gas in the 50 - 100% vol.
- Page 21 0 mA output signal, indicating sensor failure. The detector should then be checked according to Figure 4.3 on the next page. Do not return the instrument to Simtronics for repair if this test has not been performed.
- Page 22 Figure 4.3 Test procedure...
- Page 23 TECHNICAL DESCRIPTION Introduction The GD10P Gas Detector from Simtronics is a point detector for use in hazardous areas. A high-stability, solid-state infrared radiation source combined with the latest developments in optical and electronic design have led to the realisation of a compact, accurate and cost-effective instrument able to monitor explosion dangers in real-world environments.
- Page 24 Refer to Figure 5.2 below. Radiation from two infrared sources passes through two narrowband filters selecting a measuring wavelength and a reference wavelength. The sources are electronically chopped. Radiation is divided by a beamsplitter into an internal and external path. The internal path is viewed by the compensation detector, and the external path is viewed by the measuring (main) detector.
- Page 25 Figure 5.2 Block diagram, GD10P Performance characteristics 5.3.1 Gas data The GD10P standard version is factory calibrated and linearized with methane gas in the 0-100 % LEL range. Calibration/linearization to other gases or concentrations can also be done. Accurate measurements can only be achieved by having the detector calibrated for the gas it is intended to measure.
- Page 26 3.0 μm, misleading measurements may be obtained depending on the interfering gas concentration. In such cases, contact Simtronics for information. A modified GD10P using another reference wavelength will eliminate these problems. Water vapour, carbon dioxide, oxygen, nitrogen and other gases, which are present in normal air will not influence the measurements.
- Page 27 ORDERING INFORMATION Description Part Number GD10P 0-100 % LEL Methane 5 sec. source Other standard and special 128-810867 versions available on request 128-813367 GD10P-UL 100 % LEL Methane 5 sec. source Weather Protection Kit 499-810913 GD10P Housing Sample Flow Assy 499-810874 Bridge Interface Assy 109-804511...
- Page 28 1: Plate Adapter (junction box/GD10P) 499-811176 2: Plate Adapter 599-811547 (GD10P0/GD10P) Spare Parts List Designation Simrad Part Number Weather Protection Kit 499-810913 GD10P Cap, Slip-on 599-904176 Cover Assy 499-810869...
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