Gas Detector Installation and Operation Manual Instruction 6309-9000 Revision 3 – August 2013 Product Leadership • Training • Service • Reliability
MGS-150 Manual WARRANTY POLICY BACHARACH, INC. WARRANTS THIS INSTRUMENT, EXCLUDING SENSORS, TO BE FREE FROM DEFECTS IN MATERIALS AND WORKMANSHIP FOR A PERIOD OF TWO YEARS FROM THE DATE OF PURCHASE BY THE ORIGINAL OWNER. THE SENSORS HAVE A WARRANTY PERIOD OF ONE YEAR FROM THE DATE OF PURCHASE. IF THE PRODUCT SHOULD BECOME DEFECTIVE WITHIN THIS WARRANTY PERIOD, WE WILL REPAIR OR REPLACE IT AT OUR DISCRETION.
MGS-150 Manual PERFORMING ALL NEEDED REPAIRS TO RESTORE THE INSTRUMENT TO FULL OPERATING CONDITION. PRIOR TO SHIPPING EQUIPMENT TO BACHARACH, CONTACT OUR OFFICE FOR AN RMA # (RETURNED MERCHANDISE AUTHORIZATION). ALL RETURNED GOODS MUST BE ACCOMPANIED WITH AN RMA NUMBER. PACK THE EQUIPMENT WELL (IN ITS ORIGINAL PACKING IF POSSIBLE), AS BACHARACH CANNOT BE HELD RESPONSIBLE FOR ANY DAMAGE INCURRED DURING SHIPPING TO OUR FACILITY.
MGS-150 Manual Table of Contents Section 1. Overview .................................................................................... 5 1.1. General Information..................................................................................... 5 1.2. Technical Specifications ............................................................................... 6 Section 2. 2.1. 2.2. 2.3. 2.4. 2.5. 2.6. 2.7. Installation and Wiring................................................................
MGS-150 Manual Section 1. Overview 1.1. General Information The MGS-150 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 standalone basis or integrated into Controls or Building Management Systems (BMS). The MGS-150 can be used: • in new buildings/areas that require continuous monitoring with high tech gas sensor transmitters. • to add gas detection solutions to an existing system.
MGS-150 Manual 1.2. Technical Specifications Specification Power Supply Monitoring LEDs Audible Alarm Analog Outputs Relay Outputs IP Rating Temperature Rating Humidity Rating Dimensions/ Weights per Enclosure Type (see Note below) Approvals Description 12-24 VDC, 12-24 VAC 50/60 Hz, 2 W max.
MGS-150 Manual NOTE: The hazardous area EXd Gas Monitor products are designed with individually certified EXd main housing enclosures and certified EXD remote or attached sensor enclosures. The main housing enclosure and its PCB assembly are also EXd certified, but the final EXd Gas Monitor assemblies (main enclosure and/or sensor assembly) are not currently EXD certified, but are pending additional testing.
MGS-150 Manual Section 2. Installation and Wiring WARNING: Explosion hazard! Do not mount the MGS 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 contains sensitive electronic components that can be easily damaged. Do not touch nor disturb any of these components.
MGS-150 Manual 2.1. General Placement Guidelines NOTE: The MGS-150 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). In all cases the sensor supplied is designed for maximum sensitivity to a particular gas. However, in certain circumstances false alarms may be caused by the occasional presence of sufficiently high concentrations of other gaseous impurities.
MGS-150 Manual Figure 2.
MGS-150 Manual 1. Figure 3.
MGS-150 Manual Item Description Enclosure Access To open the standard sensor enclosure, turn the cable clamp 1/2 turn counter-clockwise to loosen the internal gland nut, depress the clip on top of the enclosure and open. Reverse to close. (Note: For the IP66 enclosure, use the four bolts on the front cover.) Power 12-24V AC/DC, connect at positions 0V and +V at connector block CN1. • For AC: Jumper A is on, D is off. (See Figure 2 and Figure 3. • For DC: Jumper A is off, D is on.
MGS-150 Manual 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.
MGS-150 Manual 2.4. 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. 2.5.
MGS-150 Manual 2.6. Air Conditioning (Direct Systems VRF/VRV) For compliance with EN378, at least one detector shall be installed in each occupied space being considered and the location of detectors shall be chosen in relation to the refrigerant and they shall be located where the refrigerant from the leak will collect. In this case refrigerants are heavier than air and detectors should have their sensors mounted low, e.g.
MGS-150 Manual 2.7. Remote Sensor Head Installation If you do not wish to surface mount the MGS, a brushed stainless steel faceplate is available. The remote sensor is mounted in an electrical back box 1.7 in (44 mm) deep to which the vented faceplate is fitted. CAUTION: To avoid component mix-up, do not remove sensor boards from multiple units at the same time. Alternatively, label them, or match the serial number on the main PCB and the remote sensor PCB when reinstalling. 1.
MGS-150 Manual Section 3. Housing Dimensions Figure 4.
MGS-150 Manual Figure 5.
MGS-150 Manual Figure 6. IP66Airflow Duct Mount Housing Units = mm Figure 7.
MGS-150 Manual 9.8 feet (3 meters) Typical For Dimensions and Mounting Locations , See Figure 5. Figure 8. IP66 Housing with Remote Sensor Head NOTE: For the Exd Remote Sensor Head and 16.4 ft (5 m) cable, the thread varies based on the model.
MGS-150 Manual Section 4. Operation and Stabilization On powering up, the MGS-150 will sense for the presence of gas after an initial warm-up delay of 5 minutes. The green LED will flash at 1 second intervals during the warm-up. In an alarm condition: • green LED stays on and the red LED is on • audible alarm operates (if not disabled and after delay, if set). • relay output activates (after a delay, if set) • V and I output changes proportionally with gas concentration.
MGS-150 Manual Section 5. Configurations 5.1. Overview Function Description Time Delay Available on the audible alarm and relay to avoid false alarms. This is set with jumpers. The default delay is 0 minutes. You may wish to set to 15 minutes during start up. See Figure 2 and Figure 3 for setting the jumpers. Audible Alarm The units have an internal audible alarm. You can disable this by jumper, but the default setting is “enabled” in compliance with EN378.
MGS-150 Manual Section 6. Functional Tests and Calibration 6.1. Introduction To comply with the requirements of EN378 and the European F-GAS regulation, sensors must be tested annually. However, local regulations may specify the nature and frequency of this test. CAUTION: Check local regulations on calibration or testing requirements. CAUTION: The MGS contains sensitive electronic components that can be easily damaged.
MGS-150 Manual IMPORTANT: Failure to test or calibrate the unit in accordance with applicable instructions and with industry guidelines may result in serious injury or death. The manufacturer is not liable for any loss, injury, or damage arising from improper testing, incorrect calibration, or inappropriate use of the unit. IMPORTANT: Before testing the sensors on-site, the MGS must have been powered up and allowed to stabilize.
MGS-150 Manual Exposing the sensor to a gas and observing its response to the gas. The objective is to establish if the sensor is reacting to the gas and all the sensor outputs are working correctly. There are two types of bump test. Bump Test Calibration Quantified: A known concentration of gas is used. Non-Quantified: A gas of unknown concentration is used.
MGS-150 Manual NOTE: Prior to carrying out a bump test, check and adjust the zero setting as described in the Calibration section. NOTE: Procedures for bump test and calibration vary depending on the sensor technology used and the gas in question. The MGS is available in three sensor versions: Semiconductor (SC), Electrochemical (EC) and Infrared (IR). NOTE: Do not pressurize the sensor. NOTE: For semiconductor sensors, you MUST use calibration gas in a balance of air (not N2).
MGS-150 Manual Figure 9. 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 1 Make sure that both the ampoules and the calibration beaker are clean and dry. 2 Unscrew the beaker hold screw and place the ampoule so that it sits in the base of the beaker (see Figure 10). 3 Tighten the wing-nut screw onto the ampoule without breaking it. 4 Remove the enclosure lid of the gas detector.
MGS-150 Manual Step Bump Testing Using Gas Ampoules 7 Tighten the wing-nut screw onto the ampoule until it shatters allowing the gas to diffuse in the beaker. It should be left in place for approximately 5 min. 8 The voltage output will increase. This confirms that the sensor is responding. A response equivalent to at least 50% of the test gas (typical) will confirm that the system is in order if tested with the unit’s specified span gas. 9 Remove the beaker from the sensor.
MGS-150 Manual 6.4. Calculating Calibration Voltage Sensor outputs are linear. As long as you have a gas cylinder of known concentration you can calibrate to any desired range. Example: For a sensor range of 0-1000 ppm and a cylinder of the target gas at 800 ppm: 𝐕𝐨𝐥𝐭𝐚𝐠𝐞 = 𝐓𝐚𝐫𝐠𝐞𝐭 𝐆𝐚𝐬 𝐕𝐚𝐥𝐮𝐞 × 𝐕𝐨𝐥𝐭𝐚𝐠𝐞 = 𝟖𝟎𝟎 𝐩𝐩𝐦 × 𝟓𝐕 𝐒𝐞𝐧𝐬𝐨𝐫 𝐑𝐚𝐧𝐠𝐞 𝟓𝐕 = 𝟒𝐕 𝟏𝟎𝟎𝟎 𝐩𝐩𝐦 So the output voltage signal should be adjusted to 4V. 6.5.
MGS-150 Manual 6.6. Calibrating Electrochemical (EC) Sensors There are two adjustments required: zero and span. They are monitored at 0V and VS using a 0-5V scale. If the sensor range is 0-1000 ppm, then 5V=1000 ppm. Step Calibrating Electrochemical (EC) Sensors 1 Locate Pot VR201 which is used to adjust the zero point. 2 Monitor the output between 0V (negative) and VS (positive). 3 Adjust Pot VR201 to 0V or slightly positive (0.01 V is acceptable).
MGS-150 Manual Section 7. Troubleshooting Symptom Green and Red light off Red light on, green led off (indicates a fault) Alarms in the absence of a leak 6309-9000 Rev 3 Possible Cause(s) • Check power supply. Check wiring. • MGS-150 was possibly damaged in transit. Check by installing another MGS-150 to confirm the fault. • Sensor may be disconnected from printed circuit board. Check to see sensor is properly inserted into board.
MGS-150 Manual DECLARATION OF CONFORMITY The manufacturer of the products covered by this declaration: Bacharach, Inc. 621 Hunt Valley Circle New Kensington, PA 15068 Year conformity is declared: 2012 Product(s): MGS Model(s): MGS Transmitter The undersigned hereby declares that the above referenced products are in conformity with the provisions of the following standard(s) and is in accordance with the following directive(s).
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MGS-150 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.
