Bacharach MGD-100 Installation And Operation Manual
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Bacharach MGD-100 Installation And Operation Manual

Gas detector and controllers
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Gas Detector and Controllers
Installation and Operation Manual
Instruction 6109-9000
Revision 4 – June 2014
Product Leadership • Training • Service • Reliability

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Summary of Contents for Bacharach MGD-100

  • Page 1 Gas Detector and Controllers Installation and Operation Manual Instruction 6109-9000 Revision 4 – June 2014 Product Leadership • Training • Service • Reliability...
  • Page 2 WARRANTIES). SHOULD YOUR INSTRUMENT REQUIRE NON-WARRANTY REPAIR, YOU MAY CONTACT THE DISTRIBUTOR FROM WHOM IT WAS PURCHASED OR YOU MAY CONTACT BACHARACH DIRECTLY. IF BACHARACH IS TO DO THE REPAIR WORK, SEND THE INSTRUMENT, PREPAID, TO BACHARACH, INC. AT THE FOLLOWING ADDRESS. BACHARACH, INC.
  • Page 3 COPYRIGHT PROTECTION. ALL RIGHTS ARE RESERVED. NO PARTY MAY USE OR COPY SUCH SOFTWARE IN ANY MANNER OR FORMAT, EXCEPT TO THE EXTENT THAT BACHARACH GRANTS THEM A LICENSE TO DO SO. IF THIS SOFTWARE IS BEING LOADED ONTO MORE THAN ONE COMPUTER, EXTRA SOFTWARE LICENSES MUST BE PURCHASED.

  • Page 4: Table Of Contents

    MGD-100 Manual Table of Contents SECTION 1. OVERVIEW ................5 1.1. General Information ................5 1.2. Technical Specifications ................ 10 SECTION 2. PLACING SENSORS ..............13 2.1. Installation Warnings ................13 2.2. General Guidelines ................13 2.3. Machinery Rooms ................. 15 2.4.

  • Page 5: Overview

    The MGD-100 Controller is required. With the MGD-100, it creates a stand-alone gas detection system and is used to remotely monitor up to six MGD-100 devices. Models are available with 1, 2, 4, and 6 channels. Wiring diagrams are provided later in this manual.
  • Page 6 MGD-100 Manual Figure 1. MGD-100 1- and 2-Channel Controller PCB (Single Level Alarm) Figure 2. MGD-100 1- and 2-Channel Controller PCB (Dual Level Alarm) 6109-9000 Rev 4...
  • Page 7 MGD-100 Manual Figure 3. MGD-100 4- and 6-Channel Controller PCB (Single Level Alarm) 6109-9000 Rev 4...
  • Page 8 MGD-100 Manual Figure 4. MGD-100 4- and 6-Channel Controller PCB (Dual Level Alarm) 6109-9000 Rev 4...
  • Page 9 MGD-100 Manual Figure 5. Examples MGD-100 PCBs 6109-9000 Rev 4...

  • Page 10: Technical Specifications

    MGD-100 Manual 1.2. Technical Specifications Specification Description Power Supply 100 - 230 VAC 50 - 60 Hz, or 12 VDC (specified at time of order) Alarm Silence Key Switch Alarm Delay Preset: 25 sec (low), 30 sec (high) Power Green...
  • Page 11 MGD-100 Manual Specification Description 1- and 2-chan systems 4- and 6-chan systems Std. Enclosure MGD: IP41 MGD: IP41 Ratings Controller: IP51 Controller: IP51 Dimensions 8.4” x 4.1” x 3.15” 10.3” x 10.4” x 303” and Weight: 214 x 105 x 80 mm...
  • Page 12 MGD-100 Manual Supported CFM and Duct Sizes for the Duct Mount Housing Units Duct Size Inches 12 x 12 12 x 24 18 x 18 24 x 24 24 round Feet 1 x 1 1 x 2 1.5 x 1.5...

  • Page 13: Placing Sensors

    NOTE: The MGD-100 should be installed plumb and level and securely fastened to a rigid mounting surface. The MGD-100 controller and its sensor(s) should be positioned carefully to avoid mechanical damage (from moving machinery, doors, etc.) and thermal extremes (close to heaters).
  • Page 14 MGD-100 Manual Avoid routing sensor cabling outside of premises, or between buildings via overhead cables. Also, sensor wiring should be kept to a minimum of 20 in (500mm) from the main power supply and telephone cables. When connecting the main power supply and/or sensor cables ensure a second mechanical fixing is used.

  • Page 15: Machinery Rooms

    MGD-100 Manual 2.3. Machinery Rooms There is no absolute rule in determining the number of sensors and their locations. However, a number of simple guidelines will help to make a decision. Sensors monitor a point as opposed to an area. If the gas leak does not reach the sensor then no alarm will be triggered.

  • Page 16: Refrigerated Spaces

    MGD-100 Manual Otherwise, a gas leak might pass by in a high-speed jet and not be detected by the sensor. • Make sure that pits, stairwells and trenches are monitored since they may fill with stagnant pockets of gas. •...

  • Page 17: Air Conditioning (Direct Systems Vrf/Vrv)

    MGD-100 Manual • With air-cooled chillers or air-cooled condensers with non- enclosed condenser sections it is difficult to effectively monitor leaks in the coil sections. With some designs it will be possible using an airflow sensor to monitor airflow to the start–up fans in the front or rear sections.

  • Page 18: Housing Dimensions

    MGD-100 Manual Section 3. Housing Dimensions Figure 6. MGD-100 Standard Housing 6109-9000 Rev 4...
  • Page 19 MGD-100 Manual Figure 7. MGD-100 Exd Housing Figure 8. MGD-100 IP66 Housing (with Splash Guard) 6109-9000 Rev 4...
  • Page 20 MGD-100 Manual Figure 9. MGD-100 IP66 Housing with Remote Sensor See Figure 8 for mounting locations. Cut out in duct for pitot 22mm Figure 10. MGS-100 IP66 Housing with Airflow Duct Mount 6109-9000 Rev 4...
  • Page 21 MGD-100 Manual Figure 11. 4- & 6-Sensor Controller Housing 6109-9000 Rev 4...
  • Page 22 MGD-100 Manual Figure 12. 1- to 2-Sensor Controller Housing 6109-9000 Rev 4...

  • Page 23: Wiring Instructions

    Connect the other end of the cable to the MGD-100 using terminal block CN1 positions 1,2,3 & 4. (Installation should be such that pin 1 of the MGD-100 controller is connected to pin 1 of the MGD-100). Close the housing.

  • Page 24: External Audible Alarm

    MGD-100 Manual NOTE: You may use different cables and longer distances provided the corresponding resistance shown above is not exceeded. 4.2. External Audible Alarm NOTE: This section applies to the external audible alarm (4-6 channel systems only). Step Wiring the External Audible Alarm To install the audible alarm, connect positive (red) lead to the “+”...

  • Page 25: Relays

    MGD-100 Manual 4.4. Relays All relay outputs are labeled HIGH, LOW and FAULT on the silkscreen. Connect leads to terminal block for Common (COM) and N/O and/or N/C connections as required. Note that relays are rated as 10A @ 120/230 VAC.
  • Page 26 MGD-100 Manual Figure 13. 1- & 2-Sensor, One-Alarm Installation Diagram 6109-9000 Rev 4...
  • Page 27 MGD-100 Manual Figure 14. 1- & 2-Sensor, Two-Alarm Installation Diagram 6109-9000 Rev 4...
  • Page 28 MGD-100 Manual Figure 15. 4- & 6-Sensor, One-Alarm Installation 6109-9000 Rev 4...
  • Page 29 MGD-100 Manual Figure 16. 4- & 6-Sensor, Two-Alarm Installation 6109-9000 Rev 4...

  • Page 30: Operation And Stabilization

    MGD-100 Manual Section 5. Operation and Stabilization When power to the unit is switched on, the green LED is illuminated, and then there is a 3-minute delay before the system activates. This allows the sensors to warm up to the correct temperature for gas detection.
  • Page 31 MGD-100 Manual Operation Description State Idle Only the green light on the panel is on. No gas is present. Power If the green light is off, power to the unit has been Interrupted interrupted. Refer to Section 7. Alarm One-alarm Units: Conditions One or more red lights on the panel turn on.

  • Page 32: Functional Tests And Calibration

    IMPORTANT: If the MGD-100 is exposed to a large leak it should be tested to ensure correct functionality by electrically resetting the zero setting and carrying out a bump test. See procedures below.
  • Page 33 In applications where life safety is critical, calibration should be done quarterly (every 3 months) or on a more frequent basis. Bacharach is not responsible for setting safety practices and policies. Safe work procedures including calibration policies are best determined by company policy, industry standards, and local codes.

  • Page 34: Electrical Reset

    CAUTION: Before you carry out the bump test or calibration: • Advise occupants, plant operators, and supervisors. • Check if the MGD-100 is connected to external systems such as sprinkler systems, plant shut down, external sirens and beacons, ventilation, etc. and disconnect as instructed by the customer.

  • Page 35: Bump Testing

    Calibration section. NOTE: Procedures for bump test and calibration vary depending on the sensor technology used and the gas in question. The MGD-100 is available in two sensor versions: Semiconductor (SC) and Infrared (IR). NOTE: Do not pressurize the sensor. NOTE:...
  • Page 36 MGD-100 Manual Figure 17. Gas Cylinder and Test Hardware NOTE: If the bump test is unsuccessful, perform a calibration as described later in this manual. IMPORTANT: After a semiconductor sensor is exposed to a substantial gas leak, the sensor should be checked and replaced if necessary.
  • Page 37 MGD-100 Manual Figure 18. Gas Ampoules for Bump Testing Step Bump Testing Using Gas Ampoules Make sure that both the ampoules and the calibration beaker are clean and dry. Unscrew the beaker wing nut and place the ampoule so that it sits in the base of the beaker (see Figure 18).

  • Page 38: Calibration Overview

    6.5. Calibration Options There are two available calibration options: • Exchanging the sensor board for a new, pre-calibrated one and send old one to Bacharach for recalibration (available for two- alarm units and 1- and two-alarm IR units) • On-site gas calibration.

  • Page 39: On-Site Gas Calibration

    6.7. On-Site Gas Calibration This section and the next cover calibration using calibration gas cylinders. Bacharach offers a calibration kit that consists of a calibration gas cylinder and a flow regulation valve with flexible non-absorbent tubing and vented calibration hood.
  • Page 40 MGD-100 Manual Step Adjusting the Low Alarm Threshold Voltage (ATV) Monitor the voltage between TP5 (0V) & TP4 (+Ve)/0V and VS on IR units. Apply the low concentration calibration gas to the sensor and wait until the sensor output signal stabilizes. Record this voltage.

  • Page 41: Troubleshooting

    • This may indicate a wiring fault between Controller is on, but the controller and sensor or a sensor fault. the MGD-100 is not Check power supply to the controller. Check connections between the controller and the sensor to ensure that the wires...
  • Page 42 MGD-100 Manual • Connect voltmeter and monitor voltage between TP5 (0V) and TP4 (+Ve). For IR, monitor between 0V and VS. Table 1. Connections Correct Values Position At the Sensor Controller Number 12V Power Supply +10V Sensor output, These are approximate, (0=Fault) typical internal reference values.

  • Page 43: Declaration Of Conformity

    Measurement of Combustible (EMC) Standards Gases, Toxic Gases, or Oxygen Signature: Name: Aaron Kennison Title: Engineering Manager Date: June 11, 2014 The technical documentation file required by this directive is maintained at the corporate headquarters of Bacharach, Inc. 6109-9000 Rev 4...
  • Page 44 MGD-100 Manual World Headquarters 621 Hunt Valley Circle, New Kensington, Pennsylvania 15068 Phone: 724-334-5000 • Toll Free: 1-800-736-4666 • Fax: 724-334-5001 Website: www.MyBacharach.com • E-mail: help@MyBacharach.com 6109-9000 Rev 4...

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