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Summary of Contents for GasTech D-Guard2G
- Page 1 INSTRUCTION MANUAL +61 8 6108 0000 info@gastech.com gastech.com...
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Page 2: Introduction
The D-Guard² detects gas via diffusion to the sensor at normal atmospheric pressure. 3 For Your Safety Warning: Do not make changes to this D-Guard² without the express written permission of Gastech Australia Pty Ltd. Changes that are not approved can cause death or injury to personnel. 4 Further Information Please tell us if you want help with this equipment. -
Page 3: Table Of Contents
D-Guard²G Instruction Manual Table of Contents 1 Introduction � � � � � � � � � � � � � � � � � � � � � � � � � � � 2 Method of Operation � � � � � � � � � � � � � � � � � � � � � � � � 3 For Your Safety �... - Page 4 28�3 Visual Inspection � � � � � � � � � � � � � � � � � � � � � � � � 57 29 Gastech Policy Statements � � � � � � � � � � � � � � � � � � � � � � 58...
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Page 5: List Of Figures
D-Guard²G Instruction Manual 5 List of Figures Figure 1� D-Guard²� � � � � � � � � � � � � � � � � � � � � � � � � � � 2 Figure 2� Keywords and symbols used in this manual� � � � � � � � � � � � � � � 6 Figure 3� List of supplied items��... -
Page 6: Keywords And Symbols Used In This Manual
D-Guard²G Instruction Manual 6 Keywords and Symbols Used in This Manual Symbol Keyword Description Warning: Do not (warning text). Can cause injury or death to Warning personnel. Symbol Caution: Do not (caution text). Can cause damage to parts or Caution equipment. Symbol Service tool Combined magnetic wand and hex key service tool... -
Page 7: Intended Use
D-Guard²G Instruction Manual 7 Intended use The D-Guard² is designed as a fixed gas detector with a 4-20 mA current loop output. The detector can interface with external equipment to transmit gas levels and trigger external alarm devices. Warning: The D-Guard² detects toxic and flammable gases and oxygen concentrations. These gases can cause injury or death to personnel. -
Page 8: What Is In The Box
D-Guard²G Instruction Manual 10 What is in the Box? Item Description D-Guard² gas detector D-Guard² Service Tool. The service tool activates the internal menu magnetic sensors and includes an integrated 4mm hex key to open the enclosure. The Quick Start Guide (QSG) provides a brief overview of the installation and operation of the D-Guard²... -
Page 9: Installation Information
D-Guard²G Instruction Manual 11 Installation Information Warning: The D-Guard² must be installed by an approved person. Incorrect installation can cause injury or death to personnel. 11.1 D-Guard² Mechanical Installation The D-Guard² should be mounted vertically to a suitable flat surface. Make sure the cable gland faces the ground. -
Page 10: Electrical Installation
D-Guard²G Instruction Manual 12 Electrical Installation Warning: The D-Guard² must be installed by an approved person. Incorrect installation can cause injury or death to personnel. Socket Head Socket Head Cap Screws Cap Screws Step 1. Loosen the 4 screws holding the top case on. Step 2. -
Page 11: Response Test
D-Guard²G Instruction Manual 13 Response Test Warning: You must do a response test before first use. Incorrect calibration can result in injury or death to personnel. The D-Guard² has been calibrated before dispatch. The D-Guard² must be response tested when it is first commissioned and as necessary during use. Step 1. -
Page 12: Operation
D-Guard²G Instruction Manual 14 Operation The D-Guard² menu system is controlled by the D-Guard² Service Tool (supplied). Four magnetic sensors, located behind the display window, are activated by the Service Tool. The four marks on the D-Guard² display match the magnetic sensor positions. The menu system uses custom icons and text to give information to the user. -
Page 13: 14�1 Power Up
D-Guard²G Instruction Manual 14.1 Power up Connect power to D-Guard² and energise the unit. Figure 7. D-Guard² splash screen. Figure 8. D-Guard² at sensor warm up. Figure 9. D-Guard² normal operating screen. Caution: You must wait 30 minutes for the D-Guard² to become stable. You can calibrate it after 30 minutes. -
Page 14: 14�2 Home Screen Features
D-Guard²G Instruction Manual 14.2 Home screen features The home screen is the main display that will be visible. It shows the installed gas sensor, range and the current reading. System alerts are displayed at the bottom. Magnetic sensor location Sensor type and range Menu locked System status messages location... -
Page 15: 14�4 Passcode Requested
Accept the value with the Accept the value with the Step 3. Step 4. key. key. The menu is unlocked. Step 5. Caution: If you forget the passcode, you must return the D-Guard² to a Gastech Service Centre. Item Number 201018 Rev 4: 2024-06-11... -
Page 16: Calibration
D-Guard²G Instruction Manual 15 Calibration The D-Guard² is factory calibrated before dispatch. You must calibrate the D-Guard² regularly. Calibration adjusts the response of the D-Guard² to known concentrations of gas at two points, zero and span. Zero calibration uses zero-grade air or fresh air, which does not contain any trace of the detectors intended target gas. -
Page 17: 15�2 Attach The Calibration Gas To The D-Guard²
D-Guard²G Instruction Manual 15.2 Attach the calibration gas to the D-Guard² The D-Guard² is a normally aspirated gas detector that operates at normal atmospheric pressure. A calibration plug is provided to make sure that gas is applied correctly to the sensor. Remove the splash guard. -
Page 18: 15�3 Calibration Modes
D-Guard²G Instruction Manual 15�3 Calibration Modes The D-Guard² has two calibration modes, Auto and Manual. The Auto calibration mode checks that the rate of change of the detected gas has decreased to less than ± 0.1% of full scale per second, and adjusts the D-Guard² response automatically. The Manual calibration mode allows the user to adjust the D-Guard²... -
Page 19: 15�5 Auto Zero Calibration
D-Guard²G Instruction Manual 15�5 Auto Zero Calibration� Auto zero calibration is part of the Calibration menu. Note: Fresh air can be used in place of zero-grade air. Step 1. to go into the auto zero Step 2. Apply the correct gas. Use calibration. -
Page 20: 15�6 Auto Span Calibration
D-Guard²G Instruction Manual 15.6 Auto Span Calibration Auto span calibration is part of the Calibration menu. Step 1. to go into the auto span Step 2. Apply the correct gas. Use calibration. start. Step 3. to save or to cancel. Step 4. to go back or continue. -
Page 21: 15�7 Manual Zero Calibration
D-Guard²G Instruction Manual 15.7 Manual Zero Calibration Manual zero calibration is part of the Calibration menu. Note: Fresh air can be used in place of zero-grade air. Note: The D-Guard² Trend Bar is used to determine when the rate of change of the applied gas has decreased to less than ±... -
Page 22: 15�8 Manual Span Calibration
D-Guard²G Instruction Manual 15.8 Manual Span Calibration Manual span calibration is part of the Calibration menu. Note: The D-Guard² Trend Bar is used to determine when the rate of change of the applied gas has decreased to less than ± 0.1% of full scale per second. to go into the manual Apply the correct gas. -
Page 23: System Information
D-Guard²G Instruction Manual 16 System Information The system information screens provide information about the hardware and firmware installed in the D-Guard². The sensor information screen contains useful diagnostic information about the installed sensor and its present and previous calibration information. Make sure the menu system unlocked. -
Page 24: Status
D-Guard²G Instruction Manual 17 Status The status screen gives information on any system status messages generated by the D-Guard². Make sure the menu system is unlocked. to return to the home Step 1. to go into the information Step 2. screen. screen. -
Page 25: Sensor Settings
D-Guard²G Instruction Manual 18 Sensor Settings The D-Guard² is factory configured when received. Use the Sensor Settings menu to change the user configurable parameters. 18.1 Go to the Sensor Settings Menu Make sure the menu screen is unlocked. to go into the settings to go into the sensor Step 1. -
Page 26: 18�2 Set Detector Full Scale
D-Guard²G Instruction Manual 18.2 Set Detector Full Scale The full scale setting is part of the Sensor settings menu. Step 1. to go into the full scale Step 2. to adjust then menu. save. Caution: The full scale reading cannot be greater than the range of the fitted sensor. to return to the settings to go back or Step 3. -
Page 27: 18�3 Set Span Gas Concentration
D-Guard²G Instruction Manual 18.3 Set Span Gas Concentration The span gas concentration value is part of the Sensor Settings Menu. Step 1. to go back or to set Step 2. to adjust then the span gas. save. Step 3. to return to the settings Step 4. -
Page 28: 18�4 Set Zero Gas Concentration
D-Guard²G Instruction Manual 18.4 Set Zero Gas Concentration The zero gas concentration is part of the Sensor Settings Menu. Step 1. to go back or to set Step 2. to adjust then the zero gas. save. Step 3. to return to the settings Step 4. -
Page 29: 18�5 Set Suppression Band
D-Guard²G Instruction Manual 18�5 Set Suppression Band The suppression band prevents the D-Guard² from displaying small changes in the detected gas level close to zero. It is set to 1% of the full scale value and can be on or off. The suppression band setting is part of the Sensor Settings Menu. -
Page 30: 18�6 Sensor Gain
D-Guard²G Instruction Manual 18.6 Sensor Gain You can select a sensor type from the Sensor Presets menu. The sensor gain is automatically set. You can adjust the sensor gain to compensate for differences between sensors of the same type or to change the full scale value for a sensor. The sensor gain setting is part of the Sensor Settings Menu. -
Page 31: Alarm Settings
D-Guard²G Instruction Manual 19 Alarm Settings You can configure the D-Guard² alarms. The D-Guard² has two alarms: Alarm 1 (AL1) and Alarm 2 (AL2). All alarm settings can be configured independently of each other. 19.1 Go to the Alarm Settings menu Make sure the menu system is unlocked. -
Page 32: 19�2 Alarm Direction
D-Guard²G Instruction Manual 19.2 Alarm Direction The alarm direction setting is part of the Alarm Settings Menu. Caution: You can set the alarm direction for each alarm independently. The options are rising or falling. to go back or to set to go into the direction Step 1. -
Page 33: 19�3 Alarm Level
D-Guard²G Instruction Manual 19.3 Alarm Level The alarm level setting is part of the Alarm Settings Menu. Step 1. to go back or Step 2. to highlight the level continue. menu. Step 3. to go into the level Step 4. to adjust then menu. -
Page 34: 19�4 Alarm Relay State
D-Guard²G Instruction Manual 19.4 Alarm Relay state Caution: The D-Guard² general version does not have internal relays. You must ignore this section. The D-Guard2 Relay and Siren versions have two user configurable relay outputs. You can adjust the initial state of the alarm relays. The options are de-energised or energised. The D-Guard²... -
Page 35: 19�5 Alarm Latch
D-Guard²G Instruction Manual 19.5 Alarm Latch The D-Guard² alarms can be set as latching alarms (LATCH: ENABLED) or as non-latching alarms (LATCH: DISABLED). The alarm latch setting is part of the Alarm Settings Menu. to go back or to highlight the latch Step 1. -
Page 36: 19�6 Latched Alarm Examples
D-Guard²G Instruction Manual 19.6 Latched Alarm Examples Caution: You must clear the latched alarm manually. Alarms will not reset automatically when the detected gas concentration has fallen below the set alarm level. Figure 20. AL1 and AL2 Latched. Figure 21. AL1 Latched. Figure 22. AL2 Latched. Item Number 201018 Rev 4: 2024-06-11... -
Page 37: System Settings
D-Guard²G Instruction Manual 20 System Settings You can configure the Passcode. You can isolate the D-Guard² if required. 20.1 Access the System Settings Make sure the menu system is unlocked. Step 1. to go into the settings Step 2. to highlight the menu. -
Page 38: 20�2 Isolate
D-Guard²G Instruction Manual 20.2 Isolate You can isolate the D-Guard² if required. The 4-20mA output will be set to 3.5mA when isolated. The isolate setting is part of the System Settings menu. Step 1. to go into the isolate Step 2. to adjust then menu. -
Page 39: 20�3 Set Passcode
Step 4. digit then use to apply. digit and use to save. to go back or Step 5. continue. Caution: If you forget the passcode, you must return the D-Guard² to a Gastech Service Centre. Item Number 201018 Rev 4: 2024-06-11... -
Page 40: 20�4 Disable Passcode
Step 3. Step 4. passcode menu. disable the passcode. Caution: If you forget the passcode, you must return the D-Guard² to a Gastech Service Centre. Item Number 201018 Rev 4: 2024-06-11... -
Page 41: Advanced Settings
D-Guard²G Instruction Manual 21 Advanced Settings You can configure the D-Guard² advanced settings. 21.1 Go to the Advanced Settings Menu Make sure the menu system is unlocked. Step 1. to go into the settings Step 2. to highlight advanced menu. settings. Step 3. to go into the advanced Step 4. -
Page 42: 21�2 System Calibration
D-Guard²G Instruction Manual 21.2 System Calibration You can adjust the D-Guard² 4-20mA current loop output. The system calibration options are part of the Advanced Settings menu. Step 1. to go into the advanced Step 2. to go into the system settings menu. calibration menu. -
Page 43: 21�3 4-20Ma Output Test
D-Guard²G Instruction Manual 21.3 4-20mA Output Test You can test the D-Guard² 4-20mA current loop output. The 4-20mA output test is part of the Advanced Settings menu. Step 1. to go into the advanced Step 2. to highlight the systems settings menu. tests. -
Page 44: 21�4 Relay Function Test
D-Guard²G Instruction Manual 21.4 Relay Function Test You can test the D-Guard² relays. The relay function test is part of the Advanced Settings menu. Step 1. to go into the advanced Step 2. to highlight system tests. settings menu. to go into the system to highlight the relay Step 3. -
Page 45: 21�5 Reset Sensor Life
D-Guard²G Instruction Manual 21.5 Reset Sensor Life You can reset the D-Guard² estimated life of the fitted sensor. You must reset the Sensor Life setting when a replacement sensor is fitted. The reset sensor option is part of the Advanced Settings menu. -
Page 46: 21�6 Sensor Presets
D-Guard²G Instruction Manual 21.6 Sensor Presets You can use this menu to load one of the D-Guard² sensor presets. The sensor presets are part of the Advanced Settings menu. Step 1. to go into the advanced Step 2. to highlight the load settings menu. -
Page 47: Error Codes
D-Guard²G Instruction Manual 22 Error Codes Go to the Status screen to view any active errors. Code Code Description CALIBRATE ZERO CALIBRATE SPAN CALIBRATE 4mA CALIBRATE 20mA ADC OVER RANGE ADC UNDER RANGE SENSOR OVER RANGE SENSOR UNDER RANGE OVER TEMPERATURE UNDER TEMPERATURE SENSOR END OF LIFE SENSOR FAULT... -
Page 48: Specifications
D-Guard²G Instruction Manual 24 Specifications Specifications are subject to change without notice. 24.1 Enclosure Specifications Figure 26. D-Guard² dimensions in millimetres (front view). Item Number 201018 Rev 4: 2024-06-11... - Page 49 D-Guard²G Instruction Manual Figure 27. D-Guard² dimensions in millimetres (side view). Item Number 201018 Rev 4: 2024-06-11...
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Page 50: 24�2 Mechanical Specifications
D-Guard²G Instruction Manual 24.2 Mechanical Specifications Parameter Description Specifications Enclosure material Polyoxymethylene Enclosure construction Injection molded Enclosure wall section Wall thickness 6.5mm Enclosure IP rating IP66 & IP67/68 Enclosure lid Retainer Not retained Enclosure lid fixing Four screws M5x12 Cable gland M20 Cable Gland IP68 147mm 160mm... -
Page 51: 24�4 General Specifications
D-Guard²G Instruction Manual 24.4 General Specifications Parameter Description Limits Measurement technique Electro chemical cell, infra-red Target gas List of available gas types Full scale range List of ranges by gas types Maximum loop current Under any condition 25 mA Minimum supply voltage General, Relay and Siren versions 13 V Maximum loop resistance At a supply voltage of 22 V... -
Page 52: 24�6 D-Guard² General Versions, Gas, Range, And Resolution
D-Guard²G Instruction Manual 24.6 D-Guard² General Versions, Gas, Range, and Resolution Display Lower Gastech Item Number Target Gas Units Range resolution Detection Limit 65-1080GH-C3H8 C3H8 %LEL 0.05 65-1080GH-CH4-5 %Vol 65-1080GH-CH4-100 %LEL 65-1080GH-CL2 0.05 65-1080GH-CO-100 65-1080GH-CO-500 65-1080GH-CO-1000 1000 65-1080GH-COH-200 CO (Note 1) -
Page 53: Warranty
D-Guard²G Instruction Manual 25 Warranty Gastech Australia Pty Ltd guarantees that its products, with the exception of sensors, will be devoid of any flaws in material and craftsmanship for a period of two years from the delivery date. 25.1 Sensor Warranty periods... -
Page 54: Replacement Parts
D-Guard²G Instruction Manual 26 Replacement Parts You can purchase replacement parts for your D-Guard² from Gastech or its authorised service centres. 26.1 Replacement Parts - exploded view Figure 34. D-Guard² replacement parts - exploded view. Item Number 201018 Rev 4: 2024-06-11... -
Page 55: 26�2 Replacement Parts - List
D-Guard²G Instruction Manual 26.2 Replacement parts - list Item Number Description 29-1010-01 Decal, D-Guard² 10-1010-06 Socket Head Cap Screw M5x16 21-1080-02 Splash Guard D-Guard² 10-1010-02 Socket Head Cap Screw M5x12 21-1080-03 Lid, Housing, D-Guard² 07-1080-01 Sensor gasket (Not for IR sensors) section 25.1 Sensor 57-0028... -
Page 56: Pcb (Part Number 57-0028) Configuration Jumpers
D-Guard²G Instruction Manual 27 PCB (Part number 57-0028) Configuration Jumpers NOTE: The PCB jumpers are factory set for the installed sensor. Jumper Location Jumper Description J302 Two electrode sensors J305 100 Ohm load J307 Non-biased electrochemical sensors Figure 36. PCB 57-0028 jumper locations. Sensor Item Number Target Gas J302... -
Page 57: Maintenance
D-Guard²G Instruction Manual 28 Maintenance The D-Guard² must be included in your sites regular maintenance program. 28.1 Calibration Interval Make sure the D-Guard² is calibrated regularly. Gastech recommends at least every six months. 28.2 Cleaning Figure 38. Splash Guard. Step 1. Remove the Splash Guard from the D-Guard². -
Page 58: Gastech Policy Statements
Protected through use and/or registration in the United States and many foreign countries are the trademarks and service marks of Gastech Australia Pty Ltd. The use of the ® symbol indicates registration in the United States and the ™ is in Australia; registrations may not have been issued at present in other countries. - Page 59 +61 8 6108 0000 gastech.com HEAD OFFICE SYDNEY OFFICE BRISBANE OFFICE 24 Baretta Road Suite G01, 10 Tilley Lane PO Box 59 Wangara WA 6065 Frenchs Forest NSW 2086 Kippa-Ring QLD 4021 Phone: +61 8 6108 0000 Phone: +61 2 9451 0054...
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