Emerson MRLDS-450 Quick Start Guide

Refrigerant Gas Detector (MRLDS-450) for Machinery Rooms, Cold Rooms and Freezers

Quick Start Guide

The MRLDS-450 refrigerant gas detector is designed for use in refrigeration applications and may be used as a stand-alone device, or connected to a facility’s building management system (BMS). It enables compliance with refrigerant safety codes (ASHRAE 15 and EN378) and features audible and visual alarms to alert personnel in the event of a refrigerant leak.

1. Safety Instructions

DANGER: The MRLDS-450 is NOT certified or approved for operation in

oxygen-enriched atmospheres. Failure to comply may result in severe injury or death.

WARNING: Use this product ONLY for the purposes and under the conditions

listed in the user manual. Failure to comply may result in injury and/or damage to the product. The MRLDS-450 has not been designed to be intrinsically safe for use in areas classified as being hazardous locations. For your safety, DO NOT use in hazardous locations. Consult a qualified professional before connecting the MRLDS-450 to devices not mentioned in this manual. Failure to comply may result in injury and/or damage to the product.

WARNING: The gas diffusion path can become occluded (moisture, dust, debris, frozen condensation) over time, resulting in

reduced or complete lack of gas detection and alarming function. Routine visual inspection of the gas detector and bump testing are recommended to ensure proper gas detection and alarm function. For information on calibrating the sensor, refer to the Care and Maintenance section of the MRLDS-450 User Manual P/N 026-1316.

CAUTION: Except for the maintenance detailed in this manual, this product should ONLY be opened and/or serviced by authorized personnel. Failure to comply may void the warranty.

CODE COMPLIANCE: Comply with all local and national laws, rules and regulations associated with this equipment. Operators should be aware of the regulations and standards in their industry/locality for the operation of the MRLDS-450.

TECHNICIAN USE ONLY: The MRLDS-450 must be installed by a suitably qualified technician who will install this unit in accordance with these instructions and the standards in their particular industry/locality. This document is only intended as a

guide and the manufacturer bears no responsibility for the installation or operation of this unit. Failure to install and operate the unit in accordance with these instructions and with industry guidelines may cause serious injury or death and the manufacturer will not be held responsible in this regard.

Figure 1 - Refrigerant Gas Detector

Document Part # 026-4417 Rev 2 Page 1 of 9

2. Component Overview

Figure 2 - Component Locations

# Component Description

1 M16 Cable Glands (x6) 2 Rubber Gasket 3 Internal Alarm Buzzer 4 Power Connections (x2) 5 Digital Connection (Modbus) 6 Analog Connection 7 Tactile Switch #1 8 Ribbon Cable Connection (To Sensor)

9 Tactile Switch #2 10 Relay 3 Connection (FAULT) 11 Relay 2 Connection (HIGH) 12 Relay 1 Connection (LOW) 13 Magnetic (Mag) Switch #1 14 Magnetic (Mag) Switch #2 15 M20 Cable Glands (x2)

Table 1 - Component Descriptions

Document Part # 026-4417 Rev 2 Page 2 of 9

3. Product Specifications

Size (HxWxD) 6.5” x 6.5” x 3.4” (165 x 165x 87 mm)

Weight 1.05 lbs (480g)

Indicators Multi-color Status LED

Alarm Delay Configurable (0 to 15 minutes)

Inputs Tactile Switches (x2), Magnetic Switches (x2)

Outputs Analog Output: 1 to 5V (default), 0 to 5V, 0 to 10V, 2 to10V, or

Bluetooth® Bluetooth® Low Energy, BLE 4.2

Modbus Connection: RS-485 terminal block

Power Supply 19.5 to 28.5 VDC or 24 VAC ±20%; 4W

Wiring (Power) 2-core cable, 16 to 28 AWG

Wiring (Relays) 2-core cable, 16 to 28 AWG

Wiring (Modbus) Recommended: Belden 3106A (or equivalent) 3-core, 2 twisted pair +

Enclosure Material: ABS

Temperature Semiconductor: -40°F to 122°F (-40°C to 50°C)

Humidity 5 to 90% RH, non-condensing

Pressure 23.6 to 32.5”Hg (800 to 1,100 mbar)

Elevation 0 to 6,560’ (3,000 m) altitude

Internal Alarm Buzzer: 72dB @ 3.9” (10 cm)

4 to 20mA

Baud Rate: 9,600 or 19,200 (default) Data Bits: 8 Parity: None, Odd, or Even (default) Stop Bits: 1 (default) or 2 Retry Time: 500 ms (minimum)

ground, shielded cable with 120 Ω characteristic impedance, 16 to 28 AWG

Protection: IP66

Electrochemical: Ranges vary by gas type and / or concentration, see the MRLDS-450 user manual (P/N 026-1316) for a full list of temperature ranges. Infrared: -40°F to 122°F (-40°C to 50°C) Catalytic Bead: -40 to 122°F (-40°C to 50°C)

Table 2 - Product Specifications

4. Installation

IMPORTANT: The manufacturer of this product requires that a bump test or calibration be performed following installation to verify installation to verify instrument functionality.

STEP 1: Mount Gas Detector & Remove Lid

CAUTION: DO NOT allow the lid/sensor to hang from the ribbon cable. Failure to comply may result in damage to the product.

1. Mount the MRLDS-450 according to the product dimensions, maximum wiring lengths, and following considerations:

• Environment: the full range of environmental conditions when selecting a location.

Document Part # 026-4417 Rev 2 Page 3 of 9

+ 6 hidden pages

Emerson MRLDS-450 Quick Start Guide

Specifications and Main Features

Frequently Asked Questions

User Manual