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Bacharach MGS-350 Installation And Operation Manual

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MGS-350
Gas Detector
Installation and Operation Manual
Instruction 6509-9000
Revision 1 – February 2013
Product Leadership • Training • Service • Reliability

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  • Page 1 MGS-350 Gas Detector Installation and Operation Manual Instruction 6509-9000 Revision 1 – February 2013 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 TO 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

    MGS-350 Manual Table of Contents SECTION 1. OVERVIEW ................5 1.1. General Information..................5 1.2. Specifications ....................6 SECTION 2. INSTALLATION AND WIRING ........... 14 2.1. General Placement Guidelines ..............15 2.2. Machinery Rooms ..................15 2.3. Refrigerated Spaces ................... 17 2.4.

  • Page 5: Overview

    Overview 1.1. General Information The MGS-350 is a state-of-the-art fixed gas detector which can detect a wide range of different gases. The gas sensors can be used on a stand- alone basis or integrated into Controls or Building Management Systems (BMS).

  • Page 6: Specifications

    MGS-350 Manual 1.2. Specifications Housings Dimensions Weight 145 x 185 x 80 mm 850 g Standard 5.7 x 7.3 x 3.1 in 1.9 lb 175 x 165 x 82 mm 719 g IP66 w/ Digital Display 6.9 x 6.5 x 3.2 in 1.6 lb...
  • Page 7 MGS-350 Manual Category Specification Power Supply 12-24 VAC 50/60 Hz, 12-30 VDC, 5 W maximum Power Monitoring Green LED Visual Alarm Orange LED for low level; Red LED for high level Analog Outputs 0-5 V, 0-10 V, 4-20 mA Digital Interface...
  • Page 8 MGS-350 Manual EC Sensors Formula Typical Detection Range(s) Oxygen 0-30% Ozone 0-2 ppm Phosgene COCl 0-1 ppm Phosphine 0-5 ppm Sulfur Dioxide 0-100 ppm IR Sensors Formula Typical Detection Range(s) Standard 0-10,000, 0-1% volume range: Carbon Dioxide Special 0-5,000ppm, 0-2%, 0-5%,...
  • Page 9 -40º to 122º F (-40º to 50º C) -4º to 122º F (-20º to 50º C) -40º to 122º F (-40º to 50º C) ° For temperature requirements lower than -40 , please contact the factory. Figure 1. MGS-350 Standard Housing 6509-9000 Rev 1...
  • Page 10 MGS-350 Manual Figure 2. MGS-350 IP66 Housing (with Splash Guard) 6509-9000 Rev 1...
  • Page 11 MGS-350 Manual Figure 3. IP66 Splashguard (M42 x 1.5 Thread) Figure 4. IP66 Duct Mount Housing 6509-9000 Rev 1...
  • Page 12 MGS-350 Manual Units = mm Figure 5. Exd Housing 6509-9000 Rev 1...
  • Page 13 MGS-350 Manual 9.8 feet (3 meters) Typical Figure 6. IP66 Housing with Remote Sensor Head NOTE: For the Exd Remote Head and 16.4 ft (5 m) cable, the thread varies based on the model. 6509-9000 Rev 1...

  • Page 14: Installation And Wiring

    MGS-350 Manual Section 2. Installation and Wiring WARNING: Explosion hazard! Do not mount the MGS-350 in an area that may contain flammable liquids, vapors, or aerosols. Operation of any electrical equipment in such an environment constitutes a safety hazard. CAUTION: The MGS-350 contains sensitive electronic components that can be easily damaged.

  • Page 15: General Placement Guidelines

    Changes in temperature and humidity may also affect the sensor’s performance. 2.1. General Placement Guidelines NOTE: The MGS-350 should be installed plumb and level and securely fastened to a rigid mounting surface. Sensors must be located within the appropriate wire lengths from the central control unit (if used).
  • Page 16 MGS-350 Manual machinery or plant room would be around compressors, pressurized storage vessels, refrigerant cylinders or storage rooms or pipelines. The most common leak sources are valves, gauges, flanges, joints (brazed or mechanical), filling or draining connections, etc. • When mechanical or natural ventilation is present, mount a sensor in the airflow.

  • Page 17: Refrigerated Spaces

    MGS-350 Manual 2.3. Refrigerated Spaces In refrigerated spaces, sensors should be located in the return airflow to the evaporators on a sidewall (below head-high is preferred), or on the ceiling, not directly in front of an evaporator. In large rooms with multiple evaporators, sensors should be mounted on the central line between 2 adjacent evaporators, as turbulence will result in airflows mixing.

  • Page 18: Air Conditioning (Direct Systems Vrf/Vrv)

    …in or near bathrooms. 2.6. Remote Sensor Head Installation If you do not wish to surface mount the MGS-350, a brushed stainless steel faceplate is available. The remote sensor is mounted in an electrical box 1.7 in (44 mm) deep to which the vented faceplate is fitted.

  • Page 19: Components Overview And Configuration

    MGS-350 Manual To clean, the faceplate should be lightly dusted. IMPORTANT: Do not spray chemicals on the MGS-350. 2.7. Components Overview and Configuration Figure 7. MGS-350 Connections and Key Components 6509-9000 Rev 1...
  • Page 20 Exd enclosure. The safety of this equipment is dependent on the integrity of the power supply and the grounding of the MGS-350 enclosure. CON2 Optional display connector CON3 Analog Output Pin 1: Load resistance <...
  • Page 21 MGS-350 Manual Item Description CON7 Relay 2 contacts (High-level alarm. Indicated by red LED2) S2 and S3 Hexadecimal Address Switches – Used to set a unique address for the sensor when multiple sensors are connected to a controller. Address range: 1 to 99 decimal (0x01 to 0x63)

  • Page 22: Connecting To An Mgs Controller

    Multiple MGS-350s may connect to a 2- or 6-channel MGS Controller. For details on wiring and installation, refer to the MGS Controller Manual (P/N 6709-9000). NOTE: The MGS-350 has an addressing capability and a RS-485 interface for connection to higher-level controller systems.

  • Page 23: Connecting To A Repeater

    MGS-350 Manual 2.9. Connecting to a Repeater If you wish to use more than 31 MGS-350 sensors in the system or if your cable is longer than 1000 m, then you must install a repeater. An example repeater is the IR12 by Innotech. The detailed specifications of this particular repeater are available from the following link: www.innotech.com.au/products/pdf/dsrptr.pdf...

  • Page 24: Operation And Stabilization

    Section 3. Operation and Stabilization On powering up, the MGS-350 will sense for the presence of gas after an initial warm-up delay and a 2-second software check. The green LED will light and the red and yellow LEDs will flash during the software check.

  • Page 25: Functional Tests And Calibration

    IMPORTANT: If the MGS-350 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 26 MGS-350 Manual IMPORTANT: Before testing the sensors on-site, the MGS must have been powered up and allowed to stabilize. IMPORTANT: The testing and/or calibration of the unit must be carried out by a suitably qualified technician, and must be done: •...

  • Page 27: Bump Testing

    CAUTION: Before you carry out the test or calibration: • Advise occupants, plant operators, and supervisors. • Check if the MGS-350 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 28 0-10V on CON3 across pins 1 and 3. Expose the sensor to gas from the cylinder. You can place the entire MGS-350 into a plastic bag or use a plastic hose/hood to direct gas to the sensor head. A response of above 80% is acceptable.
  • Page 29 MGS-350 Manual Figure 8. Gas Cylinder and Test Hardware Gas ampoules are convenient and inexpensive alternatives to using gas cylinders for bump testing. Step Bump Testing Using Gas Ampoules Make sure that both the ampoules and the calibration beaker are clean and dry.

  • Page 30: Calibration: Exchange Method

    Figure 9. Gas Ampoules for Bump Testing 4.3. Calibration: Exchange Method Bacharach recommends replacement of the sensor PCB with a pre- calibrated certified unit every 3 years for semiconductor (SC), infrared (IR) and catalytic (CAT), and 2 years for Electrochemical (EC) types.
  • Page 31 MGS-350 Manual Calibration: Exchange Method Step (Estimate: 10 minutes/sensor) Power off the unit. Fit the new pre-calibrated sensor and PCB in place of the old sensor and PCB. Set time delays if appropriate, and power on the unit. Carry out a bump test to confirm that the sensor is responding.

  • Page 32: Calibration: Gas Method

    The MGS-350 consists of a motherboard PCB and a sensor board PCB. There are four sensor board versions: SC, EC, CAT and IR, but the motherboard is the same for all models.
  • Page 33 MGS-350 Manual Example: For a sensor range of 0-10,000 ppm and a cylinder of the �� �� target gas at 800 ppm: �������������� = ������������ ������ �������������������������� × ������������ ���������� �� �� �������������� = ������ ������ × = ��. �� ��...

  • Page 34: Calibration: Gas Method For Sc Sensors

    MGS-350 Manual Calibration: Mother Board Alarm Relays Step (Estimate: 30 minutes/sensor) Monitor the output between TP0 (negative) and TP2 (positive). Set the low alarm at the desired level using RV1. This is the set point at which the low relay activates.

  • Page 35: Calibration: Gas Method For Cat Sensors

    MGS-350 Manual Figure 13. SC Sensor Board 4.6. Calibration: Gas Method for CAT Sensors There are two adjustments required: the zero and the span. They are performed on the sensor board but are monitored on the motherboard at the 0-10V output.
  • Page 36 MGS-350 Manual Step Calibrating Catalytic (CAT) Sensors R3 is used to adjust the zero of the sensor. On the motherboard, monitor the output between TP0 (negative) and CON3 pin 3 (positive) and adjust R3 until the voltmeter reads approximately 0 V.

  • Page 37: Calibration: Gas Method For Ec Sensors

    MGS-350 Manual 4.7. Calibration: Gas Method for EC Sensors There are two adjustments required: the zero and the span. They are performed on the sensor board but are monitored on the motherboard at the 0-10V output. IMPORTANT: VR204 (not always fitted) is used to set the bias voltage to the sensor and can be monitored between TP0 (negative) and U2 Pin 3 (positive).

  • Page 38: Calibration: Gas Method For Ir Sensors

    MGS-350 Manual Figure 15. EC Sensor Board 4.8. Calibration: Gas Method for IR Sensors There are two adjustments required: the zero and the span. They are performed on the sensor board but are monitored on the motherboard at the 0-10V output.
  • Page 39 MGS-350 Manual Step Calibrating Infrared (IR) Sensors R7 is used to adjust the zero of the sensor. On the motherboard, monitor the output between TP0 (negative) and CON3 pin 3 (positive). Expose the sensor to nitrogen or zero air. Allow a minimum of 3 minutes to stabilize, and then adjust R7 until the voltmeter reads 0 V or slightly positive (0.01 V is acceptable).

  • Page 40: Troubleshooting

    • Check power supply. Check wiring. Green LED off after • Check for proper voltage at CON1. power up • MGS-350 was possibly damaged. Check by installing another MGS-350 to confirm the fault. • Sensor may be disconnected from Red light on, green led printed circuit board.

  • Page 41: Declaration Of Conformity

    FCC CFR 47 Part 15, Subpart B Standards Gases, or Oxygen Signature: Name: Doug Keeports Title: VP of Product Development Date: 7 August 2012 The technical documentation file required by this directive is maintained at the corporate headquarters of Bacharach, Inc. 6509-9000 Rev 1...
  • Page 42 MGS-350 Manual 6509-9000 Rev 1...
  • Page 43 MGS-350 Manual 6509-9000 Rev 1...
  • Page 44 MGS-350 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 6509-9000 Rev 1...

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