1. Manuals
  2. Brands
  3. Simtronics Manuals
  4. Gas Detectors
  5. GD1 MK3
  6. Operating manual

Simtronics GD1 MK3 Operating Manual

Toxic open path gas detector
Hide thumbs
Table of Contents

Advertisement

Quick Links

Operating Manual
Simtronics GD1
MK3
Toxic Open Path Gas Detector
P/N: 850-816926-EN Rev6

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the GD1 MK3 and is the answer not in the manual?

Questions and answers

Related Manuals for Simtronics GD1 MK3

Summary of Contents for Simtronics GD1 MK3

  • Page 1 Operating Manual Simtronics GD1 Toxic Open Path Gas Detector P/N: 850-816926-EN Rev6...
  • Page 2 Copyright  June 2018 by Simtronics A.S. All rights reserved. No reproduction of all or part of this document, in any form, is permitted without the written consent of Simtronics A.S. All of the information that is provided in this document is accurate to the best of our knowledge.
  • Page 3 SIMTRONICS, even though they may be involved in the sale of SIMTRONICS products. SIMTRONICS shall not be responsible for any direct or indirect damage, or any direct or indirect consequence, resulting from the sale and use of any of its products UNLESS SUCH PRODUCTS HAVE BEEN SELECTED BY SIMTRONICS ACCORDING TO THE APPLICATION.
  • Page 4 The use of the unit has been projected for the applications specified in the technical characteristics. Exceeding the indicated values cannot in any case be authorized. SIMTRONICS recommends regular testing of fixed gas detection installations (read Chapter 6). Warranty The GD1 comes with a 5 year limited warranty on the product.

  • Page 5: Table Of Contents

    TABLE OF CONTENTS Introduction ........................7 1.1. The system ......................7 1.2. Definitions ......................7 Installation ........................9 2.1. System parts ...................... 9 2.2. Positioning ....................... 10 2.3. Mounting ......................10 2.3.1. Mounting on pole ..................11 2.4. Sun shielding ....................11 2.5.
  • Page 6 Certifications and standards ..................53 7.1. Certification ....................53 7.2. Marking ......................53 7.3. Specific condition for use in Explosive Atmosphere “X” ......... 53 Accessories and spare parts ..................55 8.1. Ordering information for the GD1 ..............57 Technical Specifications ....................59 10.

  • Page 7: Introduction

    1. INTRODUCTION 1.1. The system The GD1 is a laser-based open path Gas Detector with a separate transmitter (TX) and receiver (RX). The TX emits infrared laser light detected by the RX. The detection principle is based on measuring the absorption of light by the gas molecules along the optical line- of-sight.
  • Page 8 THIS PAGE LEFT INTENTIONALLY BLANK Page 8 of 76 850-816926-EN R06...

  • Page 9: Installation

    2. INSTALLATION The area in which the detector may be installed must be in accordance with the certification of the detector and in accordance with the standards of the appropriate authority in the country of installation. 2.1. System parts RECEIVER TRANSMITTER The complete GD1 system consists of a TX sending a laser beam to the RX.

  • Page 10: Positioning

    2.2. Positioning Deciding on how the GD1 detectors should be placed at the site is discussed in section 10.3. During installation the detector should be positioned according to the following points: • Check that there is a free line of sight between the TX and RX. •...

  • Page 11: Mounting On Pole

    When choosing pole diameter, one must account for mounting height. Simtronics recommends that for a mounting height of 2m, minimum Ø 3” (75 mm) pole is used for sufficient rigidity.

  • Page 12: Electrical Connection And Wiring

    2.5. Electrical connection and wiring Make sure that power is disconnected or switched off before connecting any wires. The system supplying power to the GD1 shall have a fuse allowing maximum 1 A of current to enter the GD1. The detector must be earthed for electrical safety and to limit the effects of radio frequency interference.
  • Page 13 Wiring overview Transmitter Junction Box: Cable from GD1 System instrument Transmitter Junction Box Com. cable cable Wire color +24 VDC White +24 VDC +24 VDC 0 V Return 0 V Return Brown 0 V Return (GND) (GND) Green Ethernet® Yellow Ethernet®...
  • Page 14 Wiring overview Receiver Junction box: Cable from GD1 System instrument Receiver Junction Box Com. cable cable Wire color White +24 VDC from Tx +24 VDC 0 V Return Brown 0 V Return from Tx (GND) Green Do not connect. Yellow Do not connect.

  • Page 15: Alternative Wiring Configurations

    2.5.1. Alternative wiring configurations The default wiring configuration for the GD1 is with power and 4-20 mA connected to the TX side, and with power supplied to the RX via the TX junction box. Wiring alternative 1: System power connected on the receiver side Wiring alternative 2: Power on both receiver and transmitter side The instrument 0 V shall be the same for both RX and TX.

  • Page 16: Cable Types And Specification

    2.5.2. Cable types and specification Cables must be chosen in accordance with applicable regulations. System cable: Cable from the GD1 system to control system. The table below indicates maximum cable lengths (2-wire) restrictions due to voltage drop over the power supply cable. 0.75 mm 1.25mm 2.5 mm...

  • Page 17: Performing Loop Test

    The shield of the system cable should be connected to instrument earth in the central control module, and is normally not terminated at the detector. Exception: If extra RFI protection is required, and the installations grounding principles/regulations allows it, the shield is terminated to local ground via the internal earth point at the detector instead.
  • Page 18 Use a device having Web browsing capabilities, for example laptop, to connect with the wireless router or Ethernet cable. If using the wireless router, from your device connect to the network SSID: “GD1” In the web browser of your device, enter the GD1 Service Interface on the address http://192.168.1.237 Log into the Service Interface with the Operator...
  • Page 19 When clicking “Test” the test value will be forced on the 4-20 mA Loop1 terminal (terminal 7 in the GD1 Junction Box). Verify that the analogue output matches the test value. Page 19 of 76 850-816926-EN R06...
  • Page 20 THIS PAGE LEFT INTENTIONALLY BLANK Page 20 of 76 850-816926-EN R06...

  • Page 21: Commissioning

    3. COMMISSIONING The commissioning of the GD1 consists of four steps: • Section 3.1 Preparation. • Section 3.2 Coarse alignment. • Section 3.3 Fine tuning • Section 3.4 Function test 3.1. Preparation Before commissioning check that the following points are fulfilled: •...
  • Page 22 Loosen screws 2 and 3 on both the TX and RX. Important: Nut A and nut on bolt B are tightened correctly in the factory and should not be touched. If tightened too much, they may jeopardize the correct operation of adjustment screws.

  • Page 23: Fine Tuning

    3.3. Fine tuning Please be aware that the GD1 4 – 20 mA output going to control system is set to 2 mA during alignment, 1 mA during during power up and after reset to measurement mode (Init). Note! Poor alignment will reduce system performance. Use care to ensure good alignment. Be aware that the nature of the GD1 system's laser beam implies a smaller target area than with traditional open path systems, and higher alignment accuracy is needed to achieve sufficient optical transmission levels.
  • Page 24 Use a device having Web browsing capabilities, for example laptop, to connect with the wireless router or Ethernet cable. If using the wireless router, from your device connect to the network SSID: “GD1” In the web browser of your device, enter the GD1 Service Interface on the address http://192.168.1.237 Log into the Service Interface with the Operator...
  • Page 25 Clicking the “Align” button sets the system in Alignment Mode. If sufficient laser light is collected by the RX, the signal strength will be shown in the Absolute transmission field. The relative transmission is automatically set to 100% when entering alignment mode. Notice that it is the Absolute transmission that shall be optimized.
  • Page 26 When continuing to turn the screw after the maximum signal strength is reached, the absolute and relative transmission will start to drop. Turn screw 5 back the other direction until the relative transmission is better than 95%. This should be close to the optimum position in the horizontal direction.
  • Page 27 Check that the absolute transmission is as expected (indicated in the graph below). The obtained absolute transmission can vary somewhat from detector to detector. If the signal is significantly lower than the suggested values, this is an indication that the fine alignment needs to be improved, the RX is poorly aligned or the lenses are dirty.
  • Page 28 Enter the screen "Instrument status" and wait for the GD1 to finish the Init procedure. In some cases, it can take several minutes for “Init” to finish. When the GD1 is in Measuring mode check that the noise level is OK by checking how the H output is fluctuating.
  • Page 29 If the signal in step 20 was too noisy (outside ± 8 ppm*m), adjust slightly vertical or horizontal alignment until the noise is reduced to an acceptable level. Avoid reducing the signal strength too much; a drop of 5 % in relative transmission is fine.

  • Page 30: Using A Hart® For Tuning Of Signal Strength

    3.3.2. Using a HART® for tuning of signal strength For tuning of signal strength and setting of transmission reference level, use the Alignment Interface Unit and a HART® terminal. Step description Illustration / response Clean the lenses of both transmitter (TX) and receiver (RX) for any dirt before proceeding.
  • Page 31 Terminal response: On the HART® terminal enter the command: Response on secondary loop (terminal 8) is set to between 3 and 14 mA depending on the strength of the optical signal received on the RX. The system is now entering Alignment Mode (AM). If sufficient initial IR laser light is collected by the receiver, the mA meter will show a value near 14 mA.
  • Page 32 Slightly loosen screw 2 just enough for the alignment mechanism to be able to move in the vertical direction. Note that the signal strength will typically drop slightly when screw 2 is loosened. If the value drops significantly, it can be helpful to reset the maximum recorded signal strength by entering #AM on the HART®...
  • Page 33 Check the current stored signal strength Terminal response: (absolute transmission) by entering the REGISTER command: 5(ABS_TRANS)=[absolute #MR 5 transmission] Store the current signal strength (optimum alignment) to the transmission reference by Terminal response: entering the following command: REGISTER #MW 2 <absolute transmission> 2(TRANS_REF)=[transmission reference] Use the <absolute transmission>...
  • Page 34 Terminal response: Save the alignment settings to the system by IM:OK entering the following command This saves the current settings, #SAV exits Service Mode and initialize (reboots) the system. Note! After initializing has completed the GD1 will enter Measuring Mode (normal operational mode).

  • Page 35: Function Test

    3.4. Function test Warning! During the test, the GD1 4 – 20 mA output going to control system will be indicating gas when performing the procedure below. Note! To conform with the SIL 2 Safety Integrity Level certification, a yearly functional test is required..

  • Page 36: Performing Function Test With Co

    Verify the 4 – 20 mA output. Expected output value (ppm*m): The output should change according to the length of the Test Cell multiplied with the gas <length> * <concentration> concentration. The table below contain some typical values Note! Depending on the precision of the gas mix inside the Test Cell, do not expect to see an exact 1:1 response compared to the test gas concentration.
  • Page 37 # Step description Illustration / response Clean the lenses on the TX and RX as described in section 5.2. Fill the Test Cell with CO as described in the section 4.2, but with CO instead of H Recommended CO test gas concentration is 10 000 –...
  • Page 38 The above spectrum is found in GD1 Web interface. Spectrum to the left showing 472 ppm of CO in the air. To the right a spectrum showing 1 191 ppm as a result of introducing the Test Cell filled with 40 000 ppm CO .The value can be verified by using the formula in step 4.

  • Page 39: Operation

    4. OPERATION The GD1 has no user adjustable parts inside. Do not open the GD1 housing, as this will change the internal atmosphere, and the initial calibration could be affected. Opening the GD1 also voids all warranty offered at the time of sale The GD1 has no user controls or adjustments (except for the specified HART®...

  • Page 40: Test Cell Filling And Emptying Instructions

    4.2. Test Cell filling and emptying instructions When working with Hydrogen Sulphide (H S) gas, observe the following: • S is very toxic by inhalation • Handle and use only in a well-ventilated space • In case of accident or if you feel unwell, seek medical advice immediately.

  • Page 41: Maintenance

    5. MAINTENANCE 5.1. Regular maintenance The detector does not have any internal functions that require regular monitoring or maintenance. Regular maintenance consists only of cleaning the optics. The GD1 has no user adjustable parts. Do not open the GD1. Opening the GD1 voids all warranty offered at the time of sale.
  • Page 42 THIS PAGE LEFT INTENTIONALLY BLANK Page 42 of 76 850-816926-EN R06...

  • Page 43: Troubleshooting

    6. TROUBLESHOOTING Simtronics shall do all service and repairs. Troubleshooting ashould be performed by the used as described below. The detector can also give fault messages if the mounting brackets are not sufficiently stable over time, for example with temperature changes or passing trucks resulting in the GD1 coming temporarily out of alignment.
  • Page 44 No Ethernet cable Configure laptop network settings to connect to fixed IP connection connect using static IP. address Fault in detector Contact Simtronics. Noisy signal Tune alignment as described in section 0. Fluctuating H level Interfering detector See section 6.3.

  • Page 45: Error Codes

    Redo alignment. Make sure >125%. lenses are clean before aligning Reboot the detector. Contact Timeout. Initialization took too long time. Simtronics if Error persists. Too short path length. Distance Unable to track the CO line between TX and RX shall be 5 meters or more.

  • Page 46: Tuning Detector For Less Noise

    6.2. Tuning detector for less noise It is normal to see fluctuations of the H S signal below ± 8 ppm*m. This is due to noise in the measurement. Several effects can influence the noise in the H S measurement such as: Alignment between RX and TX, dirt on lenses, rain, sandstorm, snow, reflections and interference from other detectors.
  • Page 47 Loosen only screw 1 or 2 for adjustment in respectively the horizontal (screw 5) or vertical (screw 4) direction. Adjust detector slightly with screw 5 or 4 for respectively horizontal or vertical direction. Observe that H S fluctuations stay within ±...

  • Page 48: Interference From Another Gd1

    6.4. Download the Diagnostics file A diagnostics file is required when contacting Simtronics or its authorized distributors for support. The diagnostics file contains information concerning serial number, the present settings and errors in the instrument. Follow the instructions to download a diagnostics...

  • Page 49: Uploading A Configuration File

    6.5. Uploading a Configuration file Simtronics can create an encrypted settings file that on upload to the GD1 can change critical detector settings. This can be used in situations where the customer requests a settings change, for example changing the span of the detector. The file is encrypted to avoid non authorized persons changing critical settings.
  • Page 50 # Step description Illustration Connect to the GD1 Service Interface as described in section 10.5. IP address: http://192.168.1.237 Enter the Diagnostics page. Click "Download config file" and store this in a safe place. This file can be used later to go back to the original settings if necessary.
  • Page 51 Click the arrow to start uploading the file to the GD1. 5 The new settings are being uploaded. When the uploading is finished, click "Go" to return to the Diagnostics page. Click "Done" on the Diagnostics page. Page 51 of 76 850-816926-EN R06...
  • Page 52 Click "Init" to restart the GD1 and initiate the new settings. After some time the GD1 should enter Measuring mode. Configuration upload finished! Page 52 of 76 850-816926-EN R06...

  • Page 53: Certifications And Standards

    Specific condition for use in Explosive Atmosphere “X” “X”- Flameproof joints have values different from those specified in the tables of standard EN 60079-1. Simtronics does not allow repairs and disclaims any responsibility for material modifications. The threaded joints may be lubricated to maintain flameproof protection. Only non- hardening lubricants or non-corrosive agents having no volatile solvents may be used.
  • Page 54 THIS PAGE LEFT INTENTIONALLY BLANK Page 54 of 76 850-816926-EN R06...

  • Page 55: Accessories And Spare Parts

    8. ACCESSORIES AND SPARE PARTS Accessory Part Number Description GD1-X00-TT06 Alignment Kit Suitcase with Laser alignment tools, Alignment Interface Unit and carry case. Gas Test Cell Kit – long version GD1-X00-TT05 Airtight chamber for function and calibration tests. The chamber has a length of 54 cm.
  • Page 56 499-817033 Alignment kit reflector plate 499-816845 Wireless router 419-906123 Laser glasses 814-816855 Spare screws and nuts for the GD1. 700-816859 All typical tools needed for alignment and service of the GD1. Page 56 of 76 850-816926-EN R06...

  • Page 57: Ordering Information For The Gd1

    8.1. Ordering information for the GD1 Mode Description -L0* Transmitter and Receiver Transmitter only Receiver only 0 – 200 ppm*m scale 0 – 500 ppm*m scale 0 – 1 000 ppm*m scale 0 – 2 000 ppm*m scale 0 – 5 000 ppm*m scale 0 –...
  • Page 58 THIS PAGE LEFT INTENTIONALLY BLANK Page 58 of 76 850-816926-EN R06...

  • Page 59: Technical Specifications

    9. TECHNICAL SPECIFICATIONS GENERAL Detection method Near IR laser scanning IR-Source Tunable laser diode Laser Class 1, eye safe Detected gas Range 0 - 200 ppm*m (default) Path length 5 - 75 m Self-test Continuous Calibration Factory set, no field recalibration Safety Integrity Level 2 (Functional test interval of once per year) PERFORMANCE...
  • Page 60 TEMPERATURE RANGE Operating -55°C to + 65°C (-67°F to +149°F) ATEX Flameproof -55°C to + 75°C (-67°F to +167°F) IECEx Flameproof -55°C to + 75°C (-67°F to +167°F) ENVIRONMENTAL Ingress protection IP66 / IP67 IEC 60529 Humidity (operation) 0 – 100% RH Humidity (storage) 0 –...

  • Page 61: System Description

    10. SYSTEM DESCRIPTION The Simtronics GD1 sets a new standard for toxic gas detection. Using a tunable laser diode, the GD1 delivers enhanced coverage and fail safe detection. The performance improvement marks a major step for safety systems and life cycle cost savings.

  • Page 62: Application Areas

    measure absorption from single absorption lines, eliminating direct interference from other gases and subsequent false gas alarms. The laser diode has a very long service life and requires no recalibration or replacement. The GD1 technology enables ultra-fast detection to single gas species at low concentrations.

  • Page 63: Positioning Considerations

    10.3. Positioning considerations Open path detectors are more susceptible to external interference compared to point detectors. To avoid performance reduction and downtime, the following should be taken into consideration when choosing mounting location. The detector should be attached to a mechanically rigid structure to help keep the unit in alignment due to influences such as: •...

  • Page 64: Detection Principles

    10.4. Detection principles Unlike a point detector, the GD1 Open Path Detector will not measure the concentration of the gas in the path between transmitter and receiver. The GD1 measures the total amount of H S in the path and the value returned by the GD1 is in ppm*m. Below are three examples with calculations on what value is expected on the GD1 for different gas clouds.

  • Page 65: How To Connect To The Web Interface With The Ethernet Cable

    Observation 3! Example 3 shows that different cloud can give same measured value. Therefore the GD1 is typically used as a “safe fence” around an installation to signal if there is an abnormal and potentially unsafe situation, and not to measure the actual concentration of the gas.
  • Page 66 Select a device having Web browsing capabilities with the wireless router or Ethernet cable. In the web browser of the device, enter the GD1 Service Interface on the address http://192.168.1.237 Log into the Service Interface with the Operator password: "gd1tlc" After logging in as Operator more functions are accessible as illustrated in the image to the right.

  • Page 67: Data Logging Functionality

    10.6. Data logging functionality The GD1 has 24 MB of space reserved for storage of data chosen by the user. The user can specify at what interval the data shall be recorded and stored. The data log can be downloaded for review of for example gas releases recorded during the latest months. The GD1 can typically store several years of data logging before it is starting to overwrite the oldest data entries.
  • Page 68 In the “Instrument Log” page the operator set up what data should be logged and at what interval. Up to six data variables can be logged and is chosen from a drop-down menu as shown below. Click “Start” to start logging the selected variables in the previous step.
  • Page 69 The data log can be downloaded by clicking the “Download the internal log file”. Data being downloaded. Data log is exported in CSV format and can then be imported and viewed in a suitable program as shown below. Data logging completed. Page 69 of 76 850-816926-EN R06...
  • Page 70 THIS PAGE LEFT INTENTIONALLY BLANK Page 70 of 76 850-816926-EN R06...

  • Page 71: Support And Contact Details

    11. SUPPORT AND CONTACT DETAILS You will find sales and technical information on our website at https://gasdetection.3M.com Email address for general enquiries: gasandflamedetectioninfomail@mmmoldhamgas.com.com Phone: +33 (0)3 21 60 80 80 11.1. Shipping instruction sending units to support In case of shipping a GD1 to support please follow the procedure below: 1.
  • Page 72 THIS PAGE LEFT INTENTIONALLY BLANK Page 72 of 76 850-816926-EN R06...
  • Page 73 THIS PAGE LEFT INTENTIONALLY BLANK Page 73 of 76 850-816926-EN R06...
  • Page 74 THIS PAGE LEFT INTENTIONALLY BLANK Page 74 of 76 850-816926-EN R06...

  • Page 75: Eu Declaration Of Conformity

    EU DECLARATION OF CONFORMITY Page 75 of 76 850-816926-EN R06...
  • Page 76 EUROPEAN PLANT AND OFFICES Z.I. Est – rue Orfila CS 20417 – 62027 ARRAS Cedex FRANCE Tél.: +33 (0)3 21 60 80 80 – Fax: +33 (0)3 21 60 80 00 Web site: https://gasdetection.3M.com AMERICAS ASIA PACIFIC EUROPE Tel : +1-713-559-9280 Tel : +86-21-3127-6373 Tel : +33-321-608-080 Fax : +1-281-292-2860...

Table of Contents