Emerson MRLDS-450 Installation And Operation Manual

Refrigerant gas detection
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MRLDS-450 Refrigerant Gas Detection 
Installation and Operation Manual
026-1316 Rev 0

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  • Page 1 MRLDS-450 Refrigerant Gas Detection  Installation and Operation Manual 026-1316 Rev 0...
  • Page 2 Emerson 1065 Big Shanty Road NW, Suite 100 Kennesaw, GA 30144 USA 770-425-2724 • www.emerson.com...
  • Page 3: Table Of Contents

    2 PRODUCT DESCRIPTION ......................4 2.1. I ......................4 NTENDED PPLICATIONS 2.2. MRLDS-450 ............................. 4 2.2.1. MRLDS-450 Product Overview....................4 2.2.2. MRLDS-450 Design Features ....................5 2.2.3. MRLDS-450 Component Overview ..................6 3 INSTALLATION ..........................7 3.1. G ........................7 ENERAL NFORMATION 3.2.
  • Page 4 6.2.1. Disposing of the Electrical and Electronic Equipment ............36 6.2.2. Disposing of Sensors......................36 6.3. T ......................37 ECHNICAL PECIFICATIONS 6.3.1. General Specifications......................37 7 ORDERING INFORMATION....................... 39 vi • MRLDS-450 Refrigerant Gas Detection I&O Manual 026-1316 Rev 0...
  • Page 5: Introduction

    Introduction 1.1. About this Manual Thank you for investing in an MRLDS-450 Gas Detector. To ensure operator safety and the proper use of the gas detector, please read the contents of this manual for important information about the operation and maintenance of the instrument.
  • Page 6: General Safety Requirements

    CAUTION! Except for maintenance detailed in this manual, these products should only be  opened and/or serviced by authorized Emerson Technical Support personnel. Failure to comply may void the warranty. ...
  • Page 7: Safe Connection Of Electrical Devices

     CAUTION! Use only genuine Emerson parts and accessories. Failure to comply may impair the operation of the product and/or void the warranty. CAUTION! Only operate the product within the framework of a risk-based alarm signaling concepts. WARNING! The gas diffusion path can become occluded (moisture, dust, debris, frozen ...
  • Page 8: Product Description

    • Oxygen • Toxic and combustible gases The MRLDS-450 refrigerant gas detector is designed for use in refrigeration applications and with the integrated audio-visual alarm indication, can be operated as a stand-alone unit (with additional local alarm signaling as required), or it may be connected to a facility's building management system (BMS).
  • Page 9: Mrlds-450 Design Features

    Bluetooth communication allows for full instrument configuration, initiation of calibration, bump test and functional test mode, and viewing of status information via the corresponding MRLDS-450 iOS/Android app. Non-intrusive magnetic wand can be used to initiate calibration of the device. MRLDS-450...
  • Page 10: Mrlds-450 Component Overview

    Relay 3 Connection (FAULT) Relay 2 Connection (HIGH) Relay 1 Connection (LOW) Magnetic (Mag) Switch #1 Magnetic (Mag) Switch #2 M20 Cable Glands (x2) Table 2-1 - MRLDS-450 Component Descriptions 6 • MRLDS-450 Refrigerant Gas Detection I&O Manual 026-1316 Rev 0...
  • Page 11: Installation

    • Any limiting factors or regulations that would affect system performance or  installations. • Wiring details, including: • The MRLDS-450 enclosure provides the following cable gland openings: • 2×, M20, supports 10-14mm cable outer diameter • 6×, M16, supports 4-8mm cable outer diameter •...
  • Page 12: Restrictions

    WARNING! DO NOT allow the lid/sensor to hang from the ribbon cable. Failure to comply may result in damage to the product. 1. Using the provided hardware, securely mount the MRLDS-450 Gas Detector  according to the product dimensions, maximum wiring lengths and following ...
  • Page 13: Power And Signal Wiring

     CAUTION! This product uses semiconductors which can be damaged by electrostatic discharge (ESD). When handling the printed circuit boards (PCBs), observe proper ESD precautions so that the electronics are not damaged. 3.4.2. Power and Signal Wiring The product comes with cable glands and plugs pre-installed. The power entry cable gland is without a gland plug.
  • Page 14: Modbus Rtu Rs-485 Interface

    • Avoid long stubs when connecting instruments to the bus, stubs should be less than one (1) meter in length. 10 • MRLDS-450 Refrigerant Gas Detection I&O Manual 026-1316 Rev 0...
  • Page 15 • Ensure A/B signal polarity is maintained throughout RS-485 network. • Connect cable shield drain to physical earth or ground at the controller only. • Ensure cable shield integrity is maintained throughout RS-485 network. ohm resistor or termination block  For Modbus end-of-line termination, use 150 Ω...
  • Page 16 E2 Setup - Device and COMM Figure 3-2 - E2 Network Setup 12 • MRLDS-450 Refrigerant Gas Detection I&O Manual 026-1316 Rev 0...
  • Page 17: Conclusion

    3.4.5. Conclusion After all wiring is completed, power the transmitter and confirm operation, and then prepare to seal the enclosure. Align the enclosure gasket (primary transmitter and remote sensor if equipped), replace the lid, and tighten the six (6) screws. Tightening torque should be limited to tightening by hand, and should be uniform in pattern.
  • Page 18: Verifying Analog Signals

    Table 4-3 - Analog Output Levels 4.1.3. Verifying the Modbus Signal The MRLDS-450 Gas Detector provides a Modbus RTU digital interface. All status messages and most parameters that can be accessed and/or configured through the Bluetooth® interface can also be accessed and/or configured via RS485 for Modbus RTU.
  • Page 19: Status Indication

    Table 4-4 - Status Indicators 4.1.5. Switch Functions User interaction with the MRLDS-450 gas detector is accomplished through the use of two magnetic switches located on the bottom of each unit. To actuate a magnetic switch, apply the supplied magnetic wand to the relevant switch location as shown in Figure 4-1.
  • Page 20 Internal switches TACT#1 and TACT#2 mirror the functions of MAG#1 and MAG#2. The function of each switch depends on the current state of the instrument. Refer to Table 4-5 for switch functions in each instrument state. 16 • MRLDS-450 Refrigerant Gas Detection I&O Manual 026-1316 Rev 0...
  • Page 21: Reset System To Factory Default Settings

    4.2. MRLDS-400 Series Application Download the MRLDS-400 Series App. The companion smartphone application allows users to perform a variety of functions to configure and interact with the MRLDS-450 gas detector, including: • View real-time measurements • Configure instrument • Test outputs •...
  • Page 22: Checking Status

    2. Launch the MRLDS-400 Series App and select the Bluetooth® icon at the bottom of the screen to initiate a scan. 3. Select MRLDS-450 default alias is “18TMAE” from the list of available gas detectors. 4. When prompted, enter the passkey (default is “123456”).
  • Page 23: Instrument Configuration

    State Status Ring Description Warm-up Green Gas detector stabilizing after power on or restart. Normal Green Normal Operation. Low Alarm Yellow Gas measurement has exceeded low alarm setpoint. High Alarm Gas measurement has exceeded high alarm setpoint. Offline Orange Gas Detector in maintenance mode and is not actively monitoring gas. Fault Orange A fault has been detected.
  • Page 24 (123456) by resetting system to factory defaults. Refer to Section 4.1.6., Reset System to Factory Default Settings for system reset procedure. Note that a system reset will return all custom system configurations to defaults. 20 • MRLDS-450 Refrigerant Gas Detection I&O Manual 026-1316 Rev 0...
  • Page 25 4.2.3.4. Reset to Factory Defaults Instrument configuration may be reset to factory defaults via the smartphone application: • On the Configure tab select Reset to Factory Default and select OK to confirm. • The instrument will automatically restart and disconnect from the smartphone  application.
  • Page 26 Sets instrument baud rate for connection to RS-485 Modbus interface (Default: 9600 baud). To set baud rate: • On the Configure tab select Modus then Baud Rate. Select 9600/19200 and OK to confirm. 22 • MRLDS-450 Refrigerant Gas Detection I&O Manual 026-1316 Rev 0...
  • Page 27 Typically, this requires a physical resistor with the same characteristic impedance of the bus cable to be installed on the bus. MRLDS-450 instruments include this termination resistor on all instruments and allow this termination to be enabled via this configuration setting without the need for an external physical resistor.
  • Page 28 • On the Configure tab select Outputs then Analog Zero Adjust. Use the slider to set desired offset adjustment. • Alternatively, select “Analog Zero Adjust (X.X%)” text and enter specific offset required (-10 to 10). 24 • MRLDS-450 Refrigerant Gas Detection I&O Manual 026-1316 Rev 0...
  • Page 29 Analog Span Range Analog span range scales the FSD (full-scale deflection) of the analog output. The selected range determines the equivalent gas measurement at the analog output maximum range. Example: R134A 1000ppm, 0-5V analog output. If Analog Span Range is set to 20%, the full analog output range only covers the first 20% of the gas measurement range, i.e., 0-200ppm will output 0-5V, above 200ppm the output will be truncated to 5V.
  • Page 30: Care And Maintenance

    Check for proper buzzer and relay operation* Every 6-12 Months** Check signal transmission to the BMS/BAS (central controller) if connected* Calibrate the sensor or contact Emerson Technical Support for sensor exchange with factory - calibrated sensor As Required Replace sensor module(s) Table 5-1 - Maintenance Intervals and Functions * These can be activated via Modbus commands or via MRLDS-400 Series App.
  • Page 31: Adjustments

    6 minutes (typical) after the adjustment has ended. 5.2.2. General Calibration Procedure IMPORTANT: The MRLDS-450 Gas Detector MAY NOT be in an alarm or fault condition during calibration. Acknowledge any alarms or faults BEFORE attempting to begin the calibration process.
  • Page 32: Zero Adjustment

    In this case, no cylinder or calibration adapter is needed for the zero adjustment.  IMPORTANT: The MRLDS-450 MAY NOT be in an alarm or fault condition during  calibration. Acknowledge any alarms or faults BEFORE attempting to begin the calibration process.
  • Page 33: Span Adjustment

    1. Begin zero adjustment: MRLDS-400 App: On the Home tab select Calibrate then scan the barcode on gas cylinder  or manually enter values for zero gas. Manual: Hold MAG#1 for more than five (5) seconds. The LED will blink GREEN-GREEN- RED when the instrument is ready.
  • Page 34: System Bump Test

    LOW ALARM or HIGH ALARM and alarms states should be ON. Manual: LED status should display LOW ALARM or HIGH ALARM. 5. Turn off gas flow and remove the calibration adapter. 30 • MRLDS-450 Refrigerant Gas Detection I&O Manual 026-1316 Rev 0...
  • Page 35: Sensor Maintenance

    CAUTION! This product uses semiconductors that can be damaged by electrostatic discharge (ESD). When handling the PCB, care must be taken so that the electronics are not damaged. Figure 5-2 - MRLDS-450 Components Sensor Maintenance Care and Maintenance • 31...
  • Page 36: Replacing Sensor Module

    90°. Take care not to apply excessive force to the sensor module’s circuit board. When the square tab of the sensor housing is aligned with the lock icon, firmly pull the module to remove it from the housing. 32 • MRLDS-450 Refrigerant Gas Detection I&O Manual 026-1316 Rev 0...
  • Page 37: Cleaning The Instrument

    4. Install the new sensor module by aligning the square tab with the lock icon before firmly pressing it into the enclosure. Taking care not to apply excessive force to the sensor module’s circuit board, rotate the sensor module clockwise 90° (or until the  triangle icon aligns with the lock icon on the lid).
  • Page 38: Additional Information

    Catalyst poisons such as sulfurous and phosphorous compounds, silicon compounds (especially silicones), and metal-organic vapors. 34 • MRLDS-450 Refrigerant Gas Detection I&O Manual 026-1316 Rev 0...
  • Page 39: Semiconductor Sensors

    It may be necessary to check the calibration if the sensor has been exposed for a long time to a high concentration of flammable gases, vapors, or the above-mentioned contaminating substances. The nature of catalytic bead sensor technology means that sensor drift may typically be up to ±5% LEL per month.
  • Page 40: Disposing Of The Instrument

    However, this device has not been registered for household usage. Therefore it must not be disposed of through these channels. The device can be returned to Emerson for disposal. Please do not hesitate to contact Emerson Technical Support if you have any further questions on this issue.
  • Page 41: Technical Specifications

    End of message: Silent 3.5 characters Operating voltage 19.5 to 28.5VDC; 24VAC ± 20%, 50/60 Hz Inrush current 1.5 A Operating power (max) MRLDS-450: 4W, 170mA @ 24VDC Power Supply and 3 SPDT Relays Relay rating 1 A at 24VAC/VDC, resistive load Audible alarm Internal Buzzer ≥72 dB at 4”...
  • Page 42 For influences on the measurement performance and Influences restrictions of a particular sensor, see sensor data sheet. Agency CE, EN 50270:2015, UL/CSA/IEC/EN 61010-1 Approvals Table 6-1 - General Specifications 38 • MRLDS-450 Refrigerant Gas Detection I&O Manual 026-1316 Rev 0...
  • Page 43: Ordering Information

    809-1166 R422D 0-1,000ppm 809-1068 R449A 0-1,000ppm 809-1168 R449A 0-1,000ppm Table 7-1 - Part Numbers and Ordering Information Emerson P/N MRLDS-450 Accessories 809-1190 Calibration Adapter Kit 809-1191 Horn + strobe 24VDC; blue lens 809-1192 Horn + strobe 24VDC; amber lens 809-1193 Horn + strobe 24VDC;...
  • Page 44 Emerson Climate Technologies Retail Solutions, Inc. and/or its affiliates (collectively “Emerson”), reserves the right to modify the designs or specifications of such products at any time without notice. Emerson does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any product remains solely with the purchaser and end-user....