Emerson DIXELL MRLDS-450 Installing And Operating Instructions
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Emerson DIXELL MRLDS-450 Installing And Operating Instructions

Emerson DIXELL MRLDS-450 Installing And Operating Instructions

Ip41 & ip66 refrigerant gas detection
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MRLDS-450
IP41 & IP66 Refrigerant Gas Detection

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Summary of Contents for Emerson DIXELL MRLDS-450

  • Page 1 MRLDS-450 IP41 & IP66 Refrigerant Gas Detection...

  • Page 3: Table Of Contents

    Table of Contents Introduction About this Manual Conventions 1.2.1 Short Form Instructions 1.2.2 Iconography General Safety Statements Safe Connection of Electrical Devices Product Description Intended Uses / Applications Transmitter Construction Power Options Diagnostic / Status LED Configurable Output Signals User Interface Technical Specifications Components 2.8.1...
  • Page 4 4.1.2 Verifying Analog Signals 4.1.3 Verifying the Modbus Signal 4.1.4 Status Indication 4.1.5 Switch Functions 4.1.6 Reset System to Factory Default Settings MRLDS-400 Smartphone Application ® 4.2.1 Enable Bluetooth Connection 4.2.2 Checking Status 4.2.3 Instrument Configuration 4.2.3.1 Change Alias 4.2.3.2 Change Unlock Code 4.2.3.3 Change Bluetooth Passcode...
  • Page 5 Disposing of the Instrument 6.2.1 Disposing of the Electrical & Electronic Equipment 6.2.2 Disposing of Sensors Sensor Specifications 1592018550 MRLDS-450 GB r.1.2 29.05.2020 MRLDS-450 5/39...

  • Page 6: Introduction

    1 Introduction 1.1 About this Manual Thank you for investing in a MRLDS-400 series gas detector. To ensure operator safety and the proper use of the gas detector, please read the contents of this manual for important information on the operation and maintenance of the instrument. 1.2 Conventions 1.2.1 Short Form Instructions This document uses a short form for describing steps (e.g.

  • Page 7: General Safety Statements

    1.3 General Safety Statements IMPORTANT: Before using this product, carefully read and strictly follow the instructions in the manual. Ensure that all product documentation is retained and available to anyone operating the instrument. DANGER: This instrument is neither certified nor approved for operation in oxygen-enriched atmospheres.

  • Page 8: Safe Connection Of Electrical Devices

    1.4 Safe Connection of Electrical Devices WARNING: Before connecting this instrument to electrical devices, consult the manufacturer or a qualified professional. Failure to comply may result in injury and / or damage to the product. 1592018550 MRLDS-450 GB r.1.2 29.05.2020 MRLDS-450 8/39...

  • Page 9: Product Description

    2 Product Description 2.1 Intended Uses / Applications MRLDS-400 gas detectors are to be installed in non-classified, non-hazardous, permanent locations for the purpose of continuously monitoring ambient air (indoor or outdoor) for the following gas types: • Refrigerants • Oxygen •...

  • Page 10: Power Options

    2.3 Power Options MRLDS-400 gas detectors may use the following power options: • 24 VAC • 19.5 to 28.5 VDC 2.4 Diagnostic / Status LED MRLDS-400 gas detectors feature a three-color LED (green, orange and red) which are used, in combination with an audible alarm, to communicate the status of the instrument.

  • Page 11: Technical Specifications

    2.7 Technical Specifications Category Specifications Normal operation:..........4 to 20 mA Drift below zero:............. 3.8 mA Measuring range exceeded:......... 20.5 mA Analog Current Instrument fault:..........≤ 1.2 mA Fault on analog interface:........> 21 mA Offline mode/Maintenance signal:..3 mA steady signal 0 to 5V;...
  • Page 12 Power and Analog 2-core shielded cable, 16 to 20 AWG (0.5 to 1.5 mm Signal 3-core, 2 twisted pair + ground, shielded cable with 120 Ω Modbus Network characteristic impedance, 16 to 24 AWG (0.2 to 1.5 Wiring M20, 10-14mm cable outer diameter Cable Gland M16, 4-8mm cable outer diameter Enclosure...

  • Page 13: Components

    2.8 Components 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. 2.8.1 MRLDS-450 Components Component Description Component Description M16 Cable Glands (×6) Tactile Switch #2 Rubber Gasket (IP66 Version Only)

  • Page 14: Installation

    3 Installation IMPORTANT: The manufacturer of this product requires that a bump test or calibration be performed following installation to verify instrument functionality. 3.1 General Information Installation site selection is critical to ensuring system performance and effectiveness. Strict compliance and considerable thought must be given to every detail of the installation process, including, but not limited to the following: ●...

  • Page 15: Restrictions

    3.2 Restrictions The installation location must have appropriate supply power available for the instrument (i.e., 19.5 to 28.5 VDC or 24 VAC). This ultimately determines the distance the instrument can be mounted from the controller or power supply. 3.3 Mechanical Installation WARNING: DO NOT allow the lid / sensor to hang from the ribbon cable.

  • Page 16: Power & Signal Wiring

    3.4.2 Power & Signal Wiring 1. Locate the relevant connections (Power, Analog, Modbus) and remove the terminal block from the PCBA. (The PCB terminal blocks are pluggable type and may be removed to aid termination.) Connection Description Label Wiring Termination 24 VDC/VAC neutral / 24V IN: - ground...

  • Page 17: Relay Wiring

    3.4.3 Relay Wiring WARNING: Relays are rated for 0 to 30V AC/DC. DO NOT apply mains power onto these relays. 1. Locate the relevant connections (Relay 1, Relay 2, Relay 3) and remove the terminal block from the PCBA. Relay Function Low Alarm High Alarm...

  • Page 18: Confirming Instrument Functionality

    Ensure that the communication parameters within the network, including the Building Management System, are configured identically. To ensure optimal performance of the Modbus network, ensure the following guidelines are implemented: ● Instruments are configured in a single bus topology, connecting multiple buses in parallel or branching multiple units from the main bus, may introduce impedance mismatches, reflections and/or signal distortions.

  • Page 19: Operation

    4 Operation 4.1 Overview of Normal Operation WARNING: Before leaving the instrument for normal operation, check the configuration for proper settings and check calibration. 4.1.1 Applying Power & the Start-up Sequence After applying power, the instrument will go through a start-up sequence (initialization, audible/visual test and self-test sequence).

  • Page 20: Verifying The Modbus Signal

    The instrument may also enter several special states, these are indicated by the specific analog output levels indicated below: Mode of Operation 1-5V 0-5V 2-10V 0-10V 4-20mA ≤ 0.3V ≤ 0.6V ≤ 1.2 mA Instrument Fault Offline Mode / Maintenance 0.75V 1.5V 3 mA...

  • Page 21: Status Indication

    4.1.4 Status Indication The MRLDS-400 gas detectors provide external indication of their current operational state via audible and visual feedback. (MRLDS-450 gas detectors also provide relays outputs.) Visual indication of the instrument status is provided by a single tri-color LED (Green / Red / Orange) as indicated below: Relay 1 Relay 2...

  • Page 22: Reset System To Factory Default Settings

    Depending on the duration the switch is held, a short “TAP” or long “HOLD” will be detected: • To carry out a tap function, tap the relevant switch location for 1 second, until a single “chirp” is heard, remove wand to confirm a “TAP.” •...

  • Page 23: Mrlds-400 Smartphone Application

    4.2 MRLDS-400 Smartphone Application To download the MRLDS-400 App, visit either the App Store or Google Play. The companion smartphone application allows users to perform a variety of functions to configure and interact with the MRLDS-400 gas detector, including: ● View real-time measurements ●...
  • Page 24 Description Alias - user configured instrument name Serial Number - instrument 8 digit serial number Gas - gas type currently detected by instrument Status Ring - provides visual indication of various instrument states (expanded on below) Live Measurement - current measurement in given measurement units Measurement Unit - displayed...

  • Page 25: Instrument Configuration

    4.2.3 Instrument Configuration For security, access to configuration and calibration options are restricted to authorized users only. Access to these functions require use of an unlock code. To unlock instrument configuration: •  Configure Tab When prompted, enter unlock code to access device configuration. (The instrument’s default code is “1234”).

  • Page 26: Reset To Factory Defaults

    • Reconnect to instrument to confirm unlock code has been updated. IMPORTANT: If custom passcode is forgotten, unlock code may be reset to default value (123456) by resetting system to factory defaults. Refer to section 4.1.6 for system reset procedure. Note system reset will return all custom system configurations to defaults.

  • Page 27: Modbus Configuration

    •   Configure Tab Alarm High Alarm Setpoint, enter new setpoint, select OK to confirm. IMPORTANT: To prevent intermittent alarm operation at the setpoint due to measurement noise this instrument implements hysteresis at the setpoint. Once the alarm level is exceeded, the gas measurement must return a fixed percentage below the alarm threshold before the alarm is disabled.

  • Page 28: Output Configuration

    •   Configure Tab Modbus Parity, select None/Odd/Even, select OK to confirm IMPORTANT: Stop bits must be set to 1 where parity is odd or even. Enable 120Ω Termination For optimal communication reliability, in RS-485 Modbus networks the last instrument physically connected to the RS-485 bus must include a 120Ω...
  • Page 29 Sets delay in minutes before instrument will indicate an alarm condition after low or high alarm threshold has been exceeded. May be used to prevent short transient alarm conditions from activating alarms. Alarm delays may be set for 0-15 minutes. Alarm delay is configured as 0 minutes by default.

  • Page 30: Care & Maintenance

    5 Care & Maintenance 5.1 Maintenance Intervals Interval Function Check calibration. Check LEDs for proper operation.* During Commissioning Check for proper buzzer and relay operation.* Check signal transmission to the BMS/BAS (central controller) if connected.* Inspection by trained service personnel. Check LEDs for proper operation.* Check for proper buzzer and relay operation.* Every 6-12...

  • Page 31: Adjustments

    Zero First, Then Span: For proper operation, never adjust the span before completing a zero adjustment. Performing these operations out of order will cause faulty calibration. IMPORTANT: Emerson recommends calibrating detectors within the application- specific condition and with target gas. This method of zeroing the detector in the application environment and performing a target gas calibration is more accurate.

  • Page 32: General Calibration Procedure

    5.2.2 General Calibration Procedure WARNING: The MRLDS-400 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. WARNING: Except for CO or O sensors, calibration gas must be in a balance of air, not nitrogen (N IMPORTANT: Calibration and / or bump testing requires the MRLDS-400 calibration adapter kit.

  • Page 33: Span Adjustment

    b. Manual: tap MAG#1 within 30-seconds or the instrument will time-out and return to normal operation. 4. Complete zero adjustment: a. MRLDS-400 App: app will countdown to completion. If calibration is successful, proceed to Step 5. If calibration is unsuccessful, return to the Home screen and press the Acknowledge button to clear the zero calibration fault.

  • Page 34: System Bump Test

    b. Manual: the LED will blink green-orange, green-orange-orange, green-orange- orange-orange, etc. until calibration is complete. To abort, hold MAG#2 for >5- seconds, turn off gas flow and remove the calibration adapter. If calibration is successful (LED blinks green-orange-red), proceed to Step 5. If calibration is unsuccessful (LED blinks orange @ 2 Hz), tap MAG#2 to discard the calibration attempt.

  • Page 35: Sensor Maintenance

    5.3 Sensor Maintenance CAUTION: This product uses semiconductors which can be damaged by electrostatic discharge (ESD). When handling the PCB, care must be taken so that the electronics is not damaged. 5.3.1 Replacing the Sensor Module MRLDS-400 gas detectors are compatible with pre-calibrated sensor modules which maintain the sensor’s gas type and calibration information.

  • Page 36: Additional Information

    6 Additional Information 6.1 Sensor Principle 6.1.1 Electrochemical Sensors Electrochemical sensors measure the partial pressure of gases under atmospheric conditions. The monitored ambient air diffuses through a membrane into the liquid electrolyte in the sensor. The electrolyte contains a measuring electrode, a counter-electrode and a reference electrode. An electronic “potentiostat”...

  • Page 37: 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 38 6.2 Disposing of the Instrument 6.2.1 Disposing of the Electrical & Electronic Equipment EU-wide regulations governing the disposal of electrical and electronic appliances which have been defined in the EU Directive 2012/19/EU and in national laws have been effective since August 2012 and apply to this device.

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