Emerson MRLDS-450 Manuel utilisateur

MRLDS-450

IP41 & IP66 Refrigerant Gas Detection

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1. INTRODUCTION

The MRLDS-450 refrigerant gas detector is designed for use in refrigeration applications, it 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.

The complete MRLDS-450 manual is available to download scanning the QR code at the end of this Quick

Refence Guide, or at the address: https://webapps.emerson.com/Dixell/Pages/Manuals

1.1 Safety Instructions

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. Failure to comply may result in personal injury or death.

WARNING: Use this product only for the purposes specified in this document and under

the conditions listed.

WARNING: This instrument has not been designed to be intrinsically safe for use in areas

classified as being hazardous locations. For your safety, DO NOT use it in hazardous

(classified) locations.

WARNING: In the event of an alarm or over-range condition, the sensor must be

recalibrated to ensure continued accuracy.

WARNING: This product must be recalibrated if installed in a non-room condition

environment (i.e. temperature or humidity extremes).

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

suggested to ensure proper gas detection and alarm function.

CAUTION: Except for maintenance detailed in this manual, these products should only be

opened and / or serviced by authorized technical personnel. Failure to comply may void

the warrant.

CAUTION: Operator assumes responsibility for complying with all laws, rules and regulations

governing the use of this product.

CAUTION: Use only genuine 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

concept.

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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

•Toxic and combustible gases

WARNING: This instrument is neither certified nor approved for operation in oxygen-

enriched atmospheres. Failure to comply may result in EXPLOSION.

WARNING: This instrument has not been designed to be intrinsically safe for use in areas

classified as being hazardous locations. For your safety, DO NOT use it in hazardous

(classified) locations.

WARNING: It is possible to identify this instrument as a safety device only evaluating the

final application and location, which defines the relevant local laws, applicable standards

and required technical characteristics; therefore, the evaluation of the MRLDS-450 as a

safety device will be ultimately assessed by the customer / installer.

2.2 Transmitter Construction

MRLDS-400 gas detectors may be purchased in the following configurations:

Enclosure

IP41

IP66

Relays

Communication

Modbus

Output

Analog

Sensor

Integrated

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2.3 Technical Specifications

Category

Specifications

Signals to Central

Controller

Analog Current

Normal operation:............................................. 4 to 20 mA

Drift below zero:..................................................... 3.8 mA

Measuring range exceeded:................................. 20.5 mA

Instrument fault:.................................................. ≤ 1.2 mA

Fault on analog interface:.................................... > 21 mA

Offline mode/Maintenance signal:....... 3 mA steady signal

Signals to Central

Controller

Analog Voltage

0 to 5V; 1 to 5V; 0 to 10V; 2 to 10V (selectable). During

fault condition, 1 to 5V and 2 to 10V outputs are 0V.

Modbus RTU over

RS-485

Baud rate:............................. 9,600 or 19,200 (selectable)

Start bits:......................................................................... 1

Data bits:......................................................................... 8

Parity:.................................. None, odd, even (selectable)

Stop bits:............................................... 1 or 2 (selectable)

Retry time:.................... 500 ms, min time between retries

End of message:............................... Silent 3.5 characters

Power Supply and

Relays

Operating Voltage

19.5 to 28.5 VDC; 24 VAC ± 20%, 50/60 Hz

Inrush Current

1.5 A

Operating Current,

Max.

4W, 170mA @ 24VDC

Relay Rating

3 SPDT

1A at 30 VAC/VDC, resistive load

Audible Alarm

Internal Buzzer ≥72 dB at 4” (10 cm)

Alarm Delay

0 to 15 minutes (selectable)

Wiring

Power and Analog

Signal

2-core shielded cable, 16 to 20 AWG (0.5 to 1.5 mm2)

Modbus Network

3-core, 2 twisted pair + ground, shielded cable with 120 Ω

characteristic impedance, 16 to 24 AWG (0.2 to 1.5mm2)

Cable Gland

M20, 10-14mm cable outer diameter

M16, 4-8mm cable outer diameter

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Physical

Specifications

Enclosure

Protection

IP41 / IP66

Enclosure Size

(W×H×D) (Approx.)

MRLDS-450 IP41: 6.5× 6.5×3.0” (165×165×77 mm)

MRLDS-450 IP66: 6.5×6.5×3.4” (165×165×87 mm)

Weight (Approx.)

1lb, 1oz (480 g)

Environmental

Temperature

- 40 to 120 ºF (-40 to 50 ºC)

Storage

Temperature

- 5 to 100 ºF (-20 to 40 ºC)

Humidity

5 to 90 %RH, non-condensing

(15 to 90 %RH, non-condensing, EC sensors excl. O2)

Sensors

See paragraph Sensor Specifications for detailed

information.

Influences

For influences on the measurement performance and

restrictions of a particular sensor see sensor data sheet.

Agency Approvals

CE, EN 50270:2015, UL/CSA/IEC/EN 61010-1

2.4 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.

2.4.1 MRLDS-450 Components

Component Description

M16 Cable Glands (x6)

Rubber Gasket

Internal Alarm Buzzer

Power Connections (x2)

Digital Connection (Modbus)

Analog Connection

Tactile Switch #1

Ribbon Cable Connection (To Sensor)

Tactile Switch #2

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 1 - Component Descriptions

Figure 2 - Component Locations

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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 Mechanical Installation

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-400 gas detector according to the product

dimensions, maximum wiring lengths and following considerations:

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

b. Application: the specifics of the application (possible leaks, air movement / draft, etc.) when

selecting a location.

c. Accessibility: the degree of accessibility required for maintenance purposes when selecting a

location.

d. Target Gas: the specific gravity of the target gas when selecting the height of the instrument.

2. Using a 5/32″ (4 mm) hex key / allen wrench (not included) remove the lid and disconnect the ribbon

cable from the base.

3. Set the lid and rubber gasket (IP66-rated enclosures only) aside to be reinstalled later.

3.2 Electrical Installation

3.2.1 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.

3.2.2 Preparations

IMPORTANT: Analog output is configured for 4 to 20 mA output by default. The MRLDS-

450 have a jumper on the analog connection. This jumper MUST be removed to use the

analog 4 to 20mA output signal. If the jumper is removed AND the 4 to 20mA signal is not

used, the unit will go into fault. The analog output is designed as sourcing.

CAUTION: Ensure wiring for relays and connections for sensor(s) are made before

applying power.

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.

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3.2.3 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).

2. Remove plugs from the corresponding M16 cable glands.

•The product comes with cable glands and plugs pre-installed. (The power entry cable gland

is shipped from the factory without a plug.)

3. Using the appropriate cable glands, insert wires into the enclosure.

4. Secure the wires in each terminal block and, pressing firmly, reinstall the terminal block into the PCBA.

•Polarity must not be reversed.

•For 24 VAC installations in a daisy-chain configuration, the neutral polarity must be maintained

for all instruments.

5. Remove all excess cable from the housing before securing the cable glands.

3.2.4 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.

2. Remove plugs from the corresponding M16 cable glands.

3. Using the appropriate cable glands, insert wires into the enclosure.

4. Secure the wires in each terminal block and, pressing firmly, reinstall the terminal block into the PCBA.

5. Remove all excess cable from the housing before securing the cable glands.

3.3 Reinstall Sensor and Connect Lid

CAUTION: DO NOT leave excess cable inside of the gas detector housing. Failure to

comply may result in damage to the product.

CAUTION: To achieve proper seal in the IP66 enclosure, the lid screws should be torqued

to 15 to 20 lbf in (1.5 to 2.0 Nm).

1. Reinstall the rubber gasket. Ensure that it is correctly seated by placing the side with two grooves

face down and the edge with two bumps on the top.

Figure 4 - Rubber Gasket Placement

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2. Reconnect the ribbon cable from the sensor to the PCBA as shown:

3. Ensure no cables are interfering with the sensor module and close the lid.

4. Using a 5/32” (4 mm) hex key/allen wrench, tighten the lid screws in an X tightening pattern:

Figure 5 - Tightening Pattern

4. OPERATION

4.1 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:

State

LED

Buzzer

Relay 1

(LOW)

Relay 2

(HIGH)

Relay 3

(Fault)

Warm-up

OFF

Normal

OFF

Low Alarm

OFF

High Alarm

OFF

Offline

OFF

Fault

OFF

Negative Gas Fault

OFF

Zero Cal. Fault

OFF

Span Cal. Fault

OFF

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4.2 Switch Functions

User interaction with the MRLDS-400 gas detector is accomplished through the use of two magnetic switches

located on the bottom of each unit. To actuate a magnetic switch (referred to as MAG#1 or MAG#2), apply the

supplied magnetic wand to the relevant switch location as indicated below:

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.”

•To carry out a hold function, do not remove the magnetic wand after the first chirp but continue to hold

for >5 seconds, until a double “chirp” is heard, remove wand to confirm a “HOLD.”

•If either switch is held for >30s, a stuck switch fault will be indicated.

To interact with the instrument without use of the magnetic wand, two internal push button tactile switches may

be used. Remove lid without removing ribbon cable to access. 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 as indicated in the following table:

State

Switch 1

(Tap)

Switch 1

(Hold)

Switch 2

(Tap)

Switch 2

(Hold)

Warm-up

Enable

Bluetooth®

Connectivity

Disable

Bluetooth®

Connectivity

Normal

Start Zero Calibration

Start Span Calibration

Low Alarm

Mute Buzzer

Ack. Latched Alarm

High Alarm

Mute Buzzer

Ack. Latched Alarm

Offline

Fault

Mute Buzzer

Ack. Latched Fault

Negative Gas Fault

Mute Buzzer

Start Zero Calibration

Zero Cal. Fault

Acknowledge Fault

Span Cal. Fault

Acknowledge Fault

4.3 Reset System to Factory Default Settings

To reset system to factory defaults, remove lid and hold TACT#1 and TACT#2 simultaneously for 30 seconds.

Instrument will restart to confirm factory reset. Alternatively, see Section 4.2.3.4 “Reset to Factory Defaults”,

for instructions on resetting instrument configuration via the MRLDS-400 App.

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4.4 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

●Configure instrument

●Test outputs

●Calibrate / bump test instrument

●Generate customizable calibration certificates

4.4.1 Enable Bluetooth® Connection

1. Enable Bluetooth®discovery by tapping MAG#1 for 1-second. (After 10-seconds, device will indicate

that it is discoverable with audible heartbeat until it has been paired, discovery has timed-out or has

been cancelled.)

2. Launch the MRLDS-400 App and click the Bluetooth®icon at the bottom of the screen to initiate a

scan.

3. Select the instrument from the list of available gas detectors.

•MRLDS-450 default alias is “18TMAE”

4. When prompted, enter the passkey (default is “123456”).

WARNING: Default alias, passkey and unlock code can be changed via the MRLDS-400

App’s configuration menu. Default values should be changed after instrument installation for

security purposes.

4.4.2 Checking Status

Current instrument status can be viewed from the Home tab, including the following:

The color code of the Status Ring is shown in the next page.

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 measurement unit

(PPM / PPB / %LEL / %VOL)

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