Emerson GDU-Incus Reference Manual

Ultrasonic gas leak detector
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Reference Manual
00809-0100-3003, Rev AD
December 2020
GDU-Incus Ultrasonic Gas Leak Detector



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  • Page 1 Reference Manual 00809-0100-3003, Rev AD December 2020 GDU-Incus Ultrasonic Gas Leak Detector...
  • Page 2 WARNING Installing, operating, or maintaining an Emerson product improperly could lead to serious injury or death from explosion or exposure to dangerous substances. Comply with all information on the product, in this manual, and in any local and national codes that apply to the product.
  • Page 3 All sales are governed by Emerson's terms and conditions, which are available upon request.
  • Page 5: Table Of Contents

    Reference Manual Contents 00809-0100-3003 December 2020 Contents Chapter 1 Introduction......................7 1.1 Product overview.........................7 1.2 Service support..........................7 1.3 Product recycling/disposal......................8 Chapter 2 Installation.........................9 2.1 Safety messages.......................... 9 2.2 Unpack and inspect........................9 2.3 Dimensions..........................10 2.4 Installation procedure........................11 2.5 Mounting...........................13 2.6 Terminal compartment wiring....................18 2.7 External cables...........................25 2.8 External ground.........................
  • Page 6 Contents Reference Manual December 2020 00809-0100-3003 6.9 ABS............................45 6.10 Declaration of Conformity....................... 46 6.11 China RoHS tables........................48 Appendix A Theory of operation....................49 GDU-Incus...
  • Page 7: Chapter 1 Introduction

    Introduction Product overview The GDU-Incus is an ultrasonic gas leak detector used for detecting airborne ultrasound generated from pressurized gas leaks. Airborne ultrasound is generated when gas moves from a high pressure area to a low pressure area with a ratio in excess of 1.8 to 1 upstream to downstream.
  • Page 8: Product Recycling/Disposal

    Introduction Reference Manual December 2020 00809-0100-3003 Product recycling/disposal Consider recycling equipment and packaging. Dispose of the product and packaging in accordance with local and national legislations and regulations. GDU-Incus...
  • Page 9: Chapter 2 Installation

    Ensure that all wiring and power supply to the detector is within specified operating parameters. Except for the terminal cover, the GDU-Incus is a sealed unit. The main enclosure may be opened only by Emerson or Emerson-authorized personnel. All warranties and certifications are nullified if the seals are tampered with or broken.
  • Page 10: Dimensions

    Reference Manual December 2020 00809-0100-3003 3. Inspect all components for obvious damage, such as broken or loose parts. 4. If any components are missing or damaged, contact your local Emerson representative or the factory immediately. Dimensions Refer to Figure 2-1 for the dimensions of the GDU-Incus.
  • Page 11: Installation Procedure

    December 2020 Installation procedure Emerson recommends mounting the GDU-Incus between 10 and 16 ft. (3 and 5 m) above the floor level to eliminate ground reflections and absorption. You may mount the detector lower than 10 ft. (3 m), but that may reduce the coverage; contact an Emerson representative for more details.
  • Page 12 As shown, the entire area below the detector is covered, as well as some of the area above and around the detector. Each sensor overlaps the next, so multiple sensors cover areas underneath the detector. GDU-Incus...
  • Page 13: Mounting

    D. Vertical mounting locking fastener, typical both sides E. Roof F. See Step G. See Step H. See Step Note GDU-Incus assembly weight: 39.7 lb. (18 kg). Ensure fixings are capable of supporting assembly weight and local standards for shock loading. Reference Manual...
  • Page 14 Installation Reference Manual December 2020 00809-0100-3003 Figure 2-4: Wall Mounting Drilling Template GDU-Incus...
  • Page 15 GDU-Incus. Drill pairs of Ø 0.4-in. (10 mm) holes on the mounting surface between 1.2 in. (30 mm) and 2.8 in. (70 mm) apart, with a vertical distance of 3.5 in.
  • Page 16 2. Position the detector so that the standard bracket is on the studs of the pole adapter. Secure the brackets together using the two M10 nuts provided. 3. Permanently fix the brackets together using the socket head bolts and nuts supplied. Use spring washers. GDU-Incus...
  • Page 17 Reference Manual Installation 00809-0100-3003 December 2020 2.5.3 Mount DNV certified detector When an installation requires equipment to be DNV certified, you must mount the detector using a DNV mounting bracket. Figure 2-6: DNV Mounting Diagram A. Roof B. Detector permanently locked in vertical position by 4X M10 bolts (one either side and two on underside of bracket) C.
  • Page 18: Terminal Compartment Wiring

    3. Secure the detector to the base plate using two M10 bolts, making sure to use spring washers. Terminal compartment wiring WARNING Failure to follow these installation guidelines could result in death or serious injury. Ensure that only qualified personnel install the detector. GDU-Incus...
  • Page 19 Ensure earth wire is attached using the supplied spring washer. The standard GDU-Incus is temperature rated between -40 and +185 °F (-40 and +85 °C), and the heated variant is temperature rated between -67 and +185 °F (-55 and +85 °C).
  • Page 20 In applications where wiring is installed in a conduit, do not use the conduit for wiring to other equipment. For full EMC requirements, ensure incoming cables are threaded through the ferrite beads (provided with the detector). See Figure 2-8. Figure 2-8: Ferrite Bead Locations A. Thread cable through ferrite B. Ferrite GDU-Incus...
  • Page 21 Reference Manual Installation 00809-0100-3003 December 2020 Procedure 1. To gain access to the terminal compartment, undo the six terminal cover fixing screws and raise the terminal cover vertically until clear of the main enclosure. The terminal cover is held in place with a stainless steel wire. You can lower the terminal cover to the side of the detector during installation, but take care to ensure the flame path is not damaged.
  • Page 22 Ensure cable entry is via suitable hazardous area approved and ingress protection certified cable glands (customer supplied) or conduit. The ATEX/IECEx approved GDU-Incus has two positions for M20 cable glands, while the FM approved detector has one position for ¾-in. national pipe thread (NPT) conduit.
  • Page 23 H. Customer cable entry position 2 (not available for FM certified detectors) Figure 2-10 shows a view of the GDU-Incus with the terminal cover removed. For single entry enclosures, enter customer cable via position 1; use positions 1 and 2 for dual entry enclosures.
  • Page 24 Figure 2-11: Electrical Connection Drawing A. Terminal row 1 B. Terminal row 2 Table 2-1: Terminal Row 1 Symbol Description Single cable entry internal earth 24 V return - (0 V) +24v +24 Vdc (15 to 30 Vdc) 4-20 mA output GDU-Incus...
  • Page 25: External Cables

    Choose customer cable in accordance with hazardous area certification and applicable local regulations. The GDU-Incus has a temperature rating of 185 °F (85 °C). When used in areas with an ambient temperature above 140 °F (60 °C), ensure cable has a rating that is equal to or exceeds the proposed maximum working temperature.
  • Page 26: External Ground

    Reference Manual December 2020 00809-0100-3003 Conductor cross sectional Maximum cable length for Maximum cable length for area/gauge standard, non-heated GDU- heated GDU-Incus Incus 1.5 mm , 16 AWG 4470 ft. (1360 m) 620 ft. (185 m) 2.5 mm , 14 AWG 7120 ft.
  • Page 27: Commissioning

    Visual inspection Before powering the detector, inspect the following: Refer to Figure 2-13 for key locations on the GDU-Incus when completing this inspection. Figure 2-13: Components of the GDU-Incus A. Display B. Sensor (four positions) C. Sensor pod (four positions) D.
  • Page 28 • Tighten terminal cover bolts to the 9 Nm recommended torque. • Verify main enclosure bolts are in place. Emerson torques these bolts at the factory; do not adjust or tamper with them. • Check display glass for damage or contaminants that may display.
  • Page 29: Chapter 3 Operate

    (if no sensors are in fault, the current loop will already be outputting dB level). To avoid false alarms, Emerson recommends setting the alarm level above the background level established by mapping when all processes are operational. If you don't know the background level, Emerson recommends using the detector to analyze the background.
  • Page 30 Most installations set the alarm levels in the control system. However, please note that the best practice is to have the control panel and the GDU-Incus's internal alarm level to always mirror each other. The reason for this is when the detector is in a sensor fault...
  • Page 31 3.1.2 Delay time To avoid spurious alarms, Emerson recommends using a delay time for non-toxic gas applications or when instantaneous detection is not required. The delay timer is activated from the point at which the alarm threshold is first exceeded.
  • Page 32 Noise 3 is a longer spurious noise of approximately 13 seconds, typical of a pressure relief valve. Delay time is introduced to ignore spurious noise spikes, as the detector will reset when noise level drops below alarm level before the delay time is reached. GDU-Incus...
  • Page 33 It is important to identify all spurious noise spikes of significant duration within the detector coverage. Emerson recommends setting the alarm delay to a value greater than the maximum spurious noise spike operating duration. If two or more spurious noise...
  • Page 34: Check Sensor Functionality

    Check sensor functionality Emerson calibrates the sensors on the GDU-Incus at the factory; they do not need to be adjusted. Before operation, Emerson recommends functionality checks to ensure correct installation. On power-up, the detector performs a diagnostic check to ensure all main functions are operational and continuously monitors the sensors via the built-in self-test.
  • Page 35: Display

    Display The GDU-Incus incorporates a five-digit segment, 0.31-in. high x 0.16-in. wide (8 mm high x 4 mm wide) character light-emitting diode (LED) display with red numerals as standard. During operation, the real-time dB level is continuously shown while below the programmed alarm level and flashing when above the programmed alarm level.
  • Page 36: 4-20 Ma Output

    00809-0100-3003 4-20 mA output Figure 3-6: 4-20 mA Output Values (Example Shows Default Op-Mode 71) Note The GDU-Incus is providing coverage when the 2.0 mA sensor test fault is active; see mA sensor test fault for more information. Figure 3-6 shows the 4-20 mA output values for the detector during normal operation and under various fault conditions.
  • Page 37: Fault Outputs

    Continuous 0.5 mA (±0.2 mA) output, indicating that all four sensors have failed self-test. Firmware version 3.4 onwards. Recommended action Contact your Emerson representative. 3.6.4 Zero mA major fault Zero (0) mA output is either caused by a total loss of power to the detector or a serious microprocessor fault.
  • Page 38 Operate Reference Manual December 2020 00809-0100-3003 GDU-Incus...
  • Page 39: Chapter 4 Hart ® Functionality

    A device description (DD) file for Emerson AMS and the hand-held TREX field terminals is available from Emerson. In addition, you can use the detector with FDT frame applications using a generic DTM.
  • Page 40 ® HART functionality Reference Manual December 2020 00809-0100-3003 GDU-Incus...
  • Page 41: Chapter 5 Maintenance

    106 dB at 3 ft. (1 m). Using the GDU-01-TT hand- held device makes testing the GDU-Incus and other types of ultrasonic detectors quick and cost-effective, as you can test at floor level at distances of up to 26 ft. (8 m) (dependent on background noise) if you can achieve line of sight with the sensor.
  • Page 42 Description GDU-02-TCFK Terminal fastener kit GDU-02-TCL Terminal cover O-ring lower for Incus GDU-02-TCU Terminal cover O-ring upper for Incus GDU-INCUS-MTBR-S GDU Incus wrap-around mounting bracket, 316 stainless steel GDU-INCUS-TCFK Terminal fastener kit: replacement terminal cover fasteners and retaining washers GDU-Incus...
  • Page 43: Chapter 6 Certifications

    Figure 6-1: Nameplate Locations A. Terminal cover plate B. Nameplate C. Certification plate (ATEX/FM) The GDU-Incus has several areas that contain important information for installation and use. Figure 6-1 shows the positions of the nameplate, certification plate, and terminal cover plate. The plates supply information to comply with ATEX Directive 2014/34/EU;...
  • Page 44: Atex

    3. Minimum fastener yield stress required ≥ 4500 MPa (property class A4-70). FM (US & Canada) Class I, Div. 1 Groups B, C, and D T4 Class I, Zone 1 AEx/Ex d ib IIB+H2 T4 -40 °C ≤ Ta ≤ +85 °C, Type 4X 3043275 GDU-Incus...
  • Page 45: Inmetro

    Reference Manual Certifications 00809-0100-3003 December 2020 INMETRO Pending Pending Pending Pending Pending Reference Manual...
  • Page 46: Declaration Of Conformity

    Certifications Reference Manual December 2020 00809-0100-3003 6.10 Declaration of Conformity GDU-Incus...
  • Page 47 Reference Manual Certifications 00809-0100-3003 December 2020 Reference Manual...
  • Page 48: China Rohs Tables

    Certifications Reference Manual December 2020 00809-0100-3003 6.11 China RoHS tables GDU-Incus...
  • Page 49: Appendix A Theory Of Operation

    • Environmental conditions Emerson has formulated a series of calculations that take all of these external factors into account in order to determine accurate coverage information for most installations. Contact an Emerson representative to advice on appropriate coverage for each installation.
  • Page 50 Can be remotely tested from up to 26.2 ft. (8 m) distance, saving on maintenance scaffold costs. ® • 4-20 mA current loop with HART communication as standard, plus relay outputs for Fault and Alarm conditions. • Can operate standalone or as part of an interfaced control system. GDU-Incus...
  • Page 51 Reference Manual 00809-0100-3003 December 2020 Reference Manual...
  • Page 52 Republic of Singapore +41 (0) 41 768 6111 +971 4 811 8100 +65 6 777 8211 +41 (0) 41 768 6300 +971 4 886 5465 +65 6 777 0947 safety.csc@emerson.com safety.csc@emerson.com safety.csc@emerson.com LinkedIn.com/company/Emerson-Automation-Solutions Twitter.com/rosemount_news Facebook.com/Rosemount © 2020 Emerson. All rights reserved. Youtube.com/RosemountMeasurement...