Emerson MRLDS-450 Installation And Operation Manual Download Page 13

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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.

Electrical Installation

Installation • 9

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. Use the appropriate cable glands to insert and connect

the wires for power and signal to the appropriate terminals as indicated in the figure

and wiring table that follow. The PCB terminal blocks are a pluggable type and may

be removed to aid termination.

IMPORTANT:
• For 24VAC installations sharing a transformer in a daisy-chain configuration, neutral

polarity must be maintained for all instruments.

• 24VAC power polarity must not be reversed.
• For a more robust system, a dedicated transformer for each MRLDS is recommended to

prevent damage caused by wiring errors.

• Fasten terminal screws.

Table 3-1

- Power and Signal Wiring

Power

Description

Label

Wiring Termination

Power

24VDC/VAC IN

24V IN: -

24VDC/VAC neutral/ground

24V IN: +

24VAC neutral

24VDC/VAC OUT

(power daisy chain

terminal)

24V OUT: -

24VDC/VAC neutral/ground

24V OUT: +

24VAC neutral

Digital Output

MODBUS Network

Communications

MODBUS: B

RS-485 “B” (inverted)

MODBUS: A

RS-485 “A” (non-inverted)

MODBUS: GND

RS-485 GND

MODBUS: SH

RS-485 Shield

Voltage or Current

ANALOG: -

Analog output ground

Analog

Output

ANALOG: +

Analog output signal (+)

3.4.3. Relay Wiring

WARNING! Relays are rated for 0 to 30V AC/DC. DO NOT apply main power onto these

relays.

Summary of Contents for MRLDS-450

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: ...Power and Signal Wiring 9 3 4 3 Relay Wiring 9 3 4 4 Modbus RTU RS 485 Interface 10 3 4 5 Conclusion 13 4 OPERATION 13 4 1 OVERVIEW OF NORMAL OPERATION 13 4 1 1 Applying Power and the Start up Sequence 13 4 1 2 Verifying Analog Signals 14 4 1 3 Verifying the Modbus Signal 14 4 1 4 Status Indication 15 4 1 5 Switch Functions 15 4 1 6 Reset System to Factory Default Settings 17 4 2 MRLDS 400 SERIES ...

Page 4: ...DITIONAL INFORMATION 34 6 1 SENSOR PRINCIPLE 34 6 1 1 Electrochemical Sensors 34 6 1 2 Catalytic Bead Sensors 34 6 1 3 Semiconductor Sensors 35 6 1 4 Infrared Sensors 35 6 2 DISPOSING OF THE INSTRUMENT 36 6 2 1 Disposing of the Electrical and Electronic Equipment 36 6 2 2 Disposing of Sensors 36 6 3 TECHNICAL SPECIFICATIONS 37 6 3 1 General Specifications 37 7 ORDERING INFORMATION 39 ...

Page 5: ...the manual 1 2 Iconography Table 1 1 Icons Alert Icon Description Danger Imminently hazardous situation which if not avoided will result in serious injury or death Warning Potentially hazardous situation which if not avoided could result in serious injury or death Potential electrical shock hazard which if not avoided could result in serious injury or death Caution Potentially hazardous situation ...

Page 6: ...ent and under the conditions listed CAUTION In the event of an alarm or over range condition the sensor must be re calibrated to ensure continued accuracy CAUTION This product must be re calibrated if installed in a non room condition environment For example temperature or humidity extremes CAUTION The gas diffusion path can become occluded moisture dust debris frozen condensation over time result...

Page 7: ...s 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 this manual Safe Connection of Electrical Devices Introduction 3 1 4 Safe Connection of Electrical Devices WARNING Before connecting this instrument t...

Page 8: ...ay be connected to a facility s building management system BMS It enables compliance with refrigerant safety codes ASHRAE 15 and EN378 and alarms to alert personnel in the event of a refrigerant leak DANGER This instrument is neither certified nor approved for operation in oxygen enriched atmospheres Failure to comply may result in EXPLOSION DANGER This instrument has not been designed to be intri...

Page 9: ...re 2 1 MRLDS 450 2 2 2 MRLDS 450 Design Features Transmitter IP66 rated ABS enclosure Power options 24VAC 19 5 to 28 5VDC Diagnostic Status LED 3 color Green Orange and Red Configurable output signal options 3 Relays high alarm low alarm fault 1 Analog Output 4 to 20mA 0 to 5V 0 to 10V 1 to 5V 2 to 10V Digital Output Modbus RTU signal Bluetooth communication allows for full instrument configuratio...

Page 10: ... 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 ...

Page 11: ...characteristics of the gas or vapor to be detected The specifics of the application For example possible leaks air movement draft etc The degree of accessibility required for maintenance purposes The types of optional equipment and accessories that will be used with the system Any limiting factors or regulations that would affect system performance or installations Wiring details including The MRL...

Page 12: ...ir 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 4mm hex key allen wrench not included remove the lid and disconnect the ribbon cable from the base 3 Set the lid and rubber gasket aside ...

Page 13: ...ing a transformer in a daisy chain configuration neutral polarity must be maintained for all instruments 24VAC power polarity must not be reversed For a more robust system a dedicated transformer for each MRLDS is recommended to prevent damage caused by wiring errors Fasten terminal screws Table 3 1 Power and Signal Wiring Power Description Label Wiring Termination Power 24VDC VAC IN 24V IN 24VDC ...

Page 14: ...e Operation NC Normally Closed Normally Open COM Common Common NO Normally Open Normally Closed 3 4 4 Modbus RTU RS 485 Interface For the Modbus RS 485 network use a 16 to 24 AWG 0 5 to 1mm2 3 core 2 twisted pair ground shielded cable with 120Ω characteristic impedance IMPORTANT Recommended Belden 3105A or equivalent The Modbus address baud rate stop bit parity and slave termination is configured ...

Page 15: ...rth or ground at the controller only Ensure cable shield integrity is maintained throughout RS 485 network For Modbus end of line termination use 150Ω ohm resistor or termination block P N 537 2711 Do not use MRLDS 120Ω ohm on board termination with Site Supervisor or E2 Site Supervisor Setup Device and COMM Figure 3 1 Site Supervisor Network Setup ...

Page 16: ...12 MRLDS 450 Refrigerant Gas Detection I O Manual 026 1316 Rev 0 E2 Setup Device and COMM Figure 3 2 E2 Network Setup ...

Page 17: ...libration 4 1 1 Applying Power and the Start up Sequence After applying power the instrument will go through a start up sequence initialization audible visual test and self test sequence After the start up sequence completes the instrument will enter a warm up period to allow the sensor element to stabilize before reporting a valid output Table 4 1 Instrument Start up Sequence Step Description 1 S...

Page 18: ...oncentration 1 5V 0 5V 2 10V 0 10V 4 20mA 0 1V 0V 2V 0V 4mA 50 3V 2 5V 6V 5V 12mA 100 5V 5V 10V 10V 20mA The instrument may also enter several special states these are indicated by the specific analog output levels indicated in Table 4 3 Table 4 3 Analog Output Levels Mode of Operation 1 5V 0 5V 2 10V 0 10V 4 20mA Instrument Fault 0 3V N A 0 6V N A 1 2mA Offline Mode Maintenance 0 75V N A 1 5V N A...

Page 19: ...ts are shown in Table 4 4 Table 4 4 Status Indicators State LED Buzzer Relay 1 LOW Relay 2 HIGH Relay 3 Fault Warm up OFF OFF OFF Normal OFF OFF OFF Low Alarm ON OFF OFF High Alarm ON ON OFF Offline OFF OFF OFF Fault OFF OFF ON Negative Gas Fault OFF OFF ON Zero Cal Fault OFF OFF OFF Span Cal Fault OFF OFF OFF 4 1 5 Switch Functions User interaction with the MRLDS 450 gas detector is accomplished ...

Page 20: ...move the magnetic wand after the first chirp but continue to hold for more than five 5 seconds until a double chirp is heard and remove wand to confirm a hold If either switch is held for more than 30 seconds 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 the lid without removing t...

Page 21: ...neously 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 Series App 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 th...

Page 22: ... changed after instrument installation for security purposes 4 2 2 Checking Status Current Instrument status can be viewed from the Home tab The Home tab displays the following status information Figure 4 2 MRLDS 400 Series App Home Tab Table 4 6 MRLDS 400 Series App Home Tab Features No Description 1 Alias user configured instrument name 2 Serial instrument 8 digit serial number 3 Gas gas type cu...

Page 23: ...tion and calibration options are restricted to authorized users only Access to these functions require use of an unlock code To unlock instrument configuration go to the Configure tab to set up the device When prompted enter unlock code to access device configuration The instrument s default code is 1234 Instrument will remain unlocked until Bluetooth connection has ended IMPORTANT Default alias p...

Page 24: ...ry Default Settings for the system reset procedure Note that a system reset will return all custom system configurations to defaults 4 2 3 3 Change Bluetooth Passcode To prevent unauthorized access to instrument status the default instrument Bluetooth passcode code should be changed during commissioning To change Bluetooth passcode On the Configure tab select Bluetooth Passcode Enter new 6 digit p...

Page 25: ... the parameter To update the setpoint On the Configure tab select Alarm then Low Alarm Setpoint Enter the new setpoint and select OK to confirm IMPORTANT In instruments with an oxygen sensor installed low alarm behavior operates in a depletion mode where gas measurements BELOW the low alarm setpoint initiate a low alarm This allows monitoring of oxygen displacement and enrichment scenarios IMPORTA...

Page 26: ...s no longer active an acknowledgment button will appear on the Home screen Select this button to acknowledge the latched condition and clear the alarm or fault When disabled the alarm or fault status clears automatically as soon as the condition is no longer active To configure On the Configure tab select Alarm then Alarm Latching Select Enable Disable and OK to confirm 4 2 3 6 Modbus Configuratio...

Page 27: ... buses due to impedance mismatches 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 To enable this termination resistor On t...

Page 28: ...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 To set alarm delay On the Configure tab select Outputs then Alarm Delay Enter the desired delay in minutes 0 15 and OK to confirm Analog Zero Adjust Analog zero adjust applies a fixed ...

Page 29: ...utput 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 Note that sensor resolution stays at the value for the max range To set analog span range On the Configure tab select Outputs then Analog Span Range Use the slider to set desired range Alternatively ...

Page 30: ...if connected Calibrate the sensor or contact Emerson Technical Support for sensor exchange with factory calibrated sensor As Required Replace sensor module s These can be activated via Modbus commands or via MRLDS 400 Series App Typical maintenance frequency can vary by sensor type Table 5 2 Maintenance Intervals and Functions Sensor Type Recommended Maintenance Interval Typical Sensor Lifetime El...

Page 31: ...tor in the application environment and performing a target gas calibration is more accurate A surrogate gas calibration may only be performed as an alternative if a target gas calibration is not possible IMPORTANT The sensor should be fully stabilized at least 2 hours preferably 24 hours IMPORTANT When entering the functions for zero or span adjustment the detector will automatically enter OFFLINE...

Page 32: ... the gas flow to approximately 0 3 L min 5 2 3 Zero Adjustment Ambient air can be used to zero the sensor instead of synthetic air only if the area is known to be free of the target gas or any gas to which the sensor may be cross sensitive 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 calib...

Page 33: ...bort hold MAG 1 for 5 seconds turn off gas flow and remove the calibration adapter If calibration is successful green LED proceed to Step 5 If calibration is unsuccessful LED blinks orange 2 Hz tap MAG 1 to discard the calibration attempt 5 Turn off gas flow from zero gas 6 Replace zero gas with calibration gas in preparation for span adjustment 5 2 4 Span Adjustment IMPORTANT Except for CO2 or O2...

Page 34: ...larm devices BMS etc are operating accordingly It is recommended that all involved persons are informed about the test and certain alarms might have to be inhibited For example shutdown valves notification of authorities etc IMPORTANT The manufacturer of this product requires that a bump test or calibration be performed following installation to verify instrument functionality 1 Connect adapter an...

Page 35: ...ore the instrument returns to normal operation green LED 5 3 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 ...

Page 36: ...rge ESD When handling the PCB care must be taken so that electronics are not damaged To replace the gas detector s sensor module 1 Power down the gas detector 2 Using a 5 32 4mm hex key allen wrench not included remove the lid and disconnect the ribbon cable from the sensor module 3 Remove installed sensor module from the lid by holding onto the housing and turning counter clockwise 90 Take care n...

Page 37: ...the ribbon cable to the sensor module and transmitter and close the lid 6 Ensure gasket is aligned correctly and tighten the lid using the supplied hardware in an X pattern Tightening torque should be limited to hand tight and should be uniform Figure 5 4 Tightening Pattern 7 Power up the gas detector 8 After the start up sequence has finished check sensor response bump test 5 4 Cleaning the Instr...

Page 38: ... heat of combustion principle The monitored air diffuses through the sintered metal disc into the sensor The mixture of combustible gases vapors and air are catalytically combusted at a heated detector element called a pellistor The oxygen content in the air must be greater than 12 Vol Due to the resulting heat of combustion the temperature of the detector element rises This increase in temperatur...

Page 39: ...por molecules to come in contact with the sensor surface Water vapor high ambient humidity temperature fluctuations and low oxygen levels can result in higher readings IMPORTANT Certain substances in the environment to be monitored may impair the sensitivity of the sensors 1 Materials containing silicone or silicone rubber putty 2 Corrosive gases such as hydrogen sulfide sulfur oxide chlorine hydr...

Page 40: ...his 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 6 2 2 Disposing of Sensors Dispose of sensors in accordance with local laws DANGER Do not dispose of sensors in fire due to th...

Page 41: ... 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 5VDC 24VAC 20 50 60 Hz Inrush current 1 5 A Operating power max MRLDS 450 4W 170mA 24VDC Relay rating 3 SPDT 1 A at 24VAC VDC resistive load Audible alarm Internal Buzzer 72 dB at 4 10cm ...

Page 42: ...F 40 to 50ºC Storage temperature 5 to 100ºF 20 to 40ºC Humidity 5 to 90 RH non condensing 15 to 90 RH non condensing EC sensors excl O2 Pressure 23 6 to 32 5 inch Hg 800 to 1 100 mbar Elevation 0 to 10 000 ft 3 050 m altitude 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...

Page 43: ...9 1048 R407A 0 1 000ppm 809 1148 R407A 0 1 000ppm SC 809 1050 R22 0 1 000ppm 809 1150 R22 0 1 000ppm SC 809 1056 R448A 0 1 000ppm 809 1156 R448A 0 1 000ppm SC 809 1066 R422D 0 1 000ppm 809 1166 R422D 0 1 000ppm SC 809 1068 R449A 0 1 000ppm 809 1168 R449A 0 1 000ppm SC Table 7 2 Accessory Part Numbers and Ordering Information Emerson P N MRLDS 450 Accessories 809 1190 Calibration Adapter Kit 809 11...

Page 44: ... 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 02...

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