Emerson MRLDS-250 User manual

026-1315 Rev 2 11-APR-2017
MRLDS-250 Infrared Gas Detector
Installation and Operation Manual

Emerson Retail Solutions
1065 Big Shanty Road NW, Suite 100
Kennesaw, GA 30144, USA
Phone [phone]
Fax [phone]

Table of Contents • i
TABLE OF CONTENTS
1 INTRODUCTION.......................................................................................................................................................... 1
1.1. OVERVIEW .................................................................................................................................................................... 1
1.2. DETECTION OPTIONS .................................................................................................................................................... 1
1.2.1. Broadband vs. Gas Specific .................................................................................................................................. 1
1.2.2. Broadband Gas Detection..................................................................................................................................... 1
1.2.3. Detecting Specific Gases....................................................................................................................................... 2
1.3. REMOTE CONTROLLER OPTIONS .................................................................................................................................. 3
1.4. PARTS LIST ................................................................................................................................................................... 3
1.5. SPECIFICATIONS ............................................................................................................................................................ 3
2 MOUNTING THE GAS DETECTOR......................................................................................................................... 4
2.1. WARNINGS AND PREREQUISITES .................................................................................................................................. 4
2.2. MOUNTING LOCATIONS ................................................................................................................................................ 4
2.2.1. General Placement Guidelines ............................................................................................................................. 4
2.2.2. Machinery Rooms ................................................................................................................................................. 4
2.2.3. Refrigerated Spaces .............................................................................................................................................. 5
2.2.4. Chillers.................................................................................................................................................................. 5
2.3. MOUNTING PROCEDURE ............................................................................................................................................... 5
3 WIRING AND CONFIGURATION ............................................................................................................................ 7
3.1. OVERVIEW .................................................................................................................................................................... 7
3.2. WIRING SUPPLY POWER (24VAC OR 24VDC) ............................................................................................................ 7
3.3. WIRING ALARM OUTPUT (ANALOG SIGNAL)............................................................................................................... 8
3.4. WIRING THE DIGITAL ALARM OUTPUT RELAY............................................................................................................ 8
3.5. FINISH INSTALLATION .................................................................................................................................................. 9
4 OPERATION AND STABILIZATION..................................................................................................................... 10
4.1. POWER UP AND WARM UP......................................................................................................................................... 10
4.2. STABILIZATION ........................................................................................................................................................... 10
4.3. PERFORM A MANUAL ZERO ....................................................................................................................................... 10
4.4. ALARMS...................................................................................................................................................................... 10
4.5. GAS DETECTOR FAULTS ............................................................................................................................................. 10
4.5.1. Overview ............................................................................................................................................................. 10
4.5.2. Non-Critical Faults ............................................................................................................................................. 11
4.5.3. Critical Faults ..................................................................................................................................................... 11
5 CONFIGURE THE GAS DETECTOR ..................................................................................................................... 12
5.1. USER INTERFACE OVERVIEW ..................................................................................................................................... 12
5.2. SETTING PARAMETERS ............................................................................................................................................... 12
5.2.1. Overview ............................................................................................................................................................. 12
5.2.2. Configuration Parameters .................................................................................................................................. 12
5.3. COMPLETING SETUP ................................................................................................................................................... 15
6 FUNCTIONAL TESTS AND ADJUSTMENTS....................................................................................................... 16
6.1. INTRODUCTION ........................................................................................................................................................... 16
6.2. BUMP TESTING VS. ADJUSTING DETECTOR RESPONSE .............................................................................................. 16
6.3. BUMP TESTING ........................................................................................................................................................... 17
6.4. ADJUSTMENT USING CALIBRATION GAS.................................................................................................................... 18
7 TROUBLESHOOTING .............................................................................................................................................. 19

ii • MRLDS-250 Gas Detector Manual 026-1315 Rev 2 11-APR-2017
7.1. FAULT CODES ............................................................................................................................................................. 19
7.2. DIAGNOSTIC ATTRIBUTES (P.-18) .............................................................................................................................. 20
7.3. RESETTING THE MRLDS-250 TO DEFAULT VALUES ................................................................................................. 20
7.4. OTHER SYMPTOMS...................................................................................................................................................... 21
8 REPLACEMENT PARTS AND ACCESSORIES.................................................................................................... 22

Overview Introduction • 1
1 Introduction
1.1. Overview
The MRLDS-250 NDIR (non-dispersive infrared)
is a fixed gas detector that can detect a wide range of
refrigerant gases. The MRLDS-250 can be used on a
stand-alone basis or integrated into controls or a
Building Management System (BMS).
The MRLDS-250 can be used in locations that
require continuous monitoring and to add gas
detection solutions to an existing system.
Figure 1-1 MRLDS-250 Components
1.2. Detection Options
1.2.1. Broadband vs. Gas Specific
The MRLDS-250 NDIR refrigerant gas detectors
are available in two versions: broadband and
gas-specific.
1.2.2. Broadband Gas Detection
The broadband gas detector (P/N 809-0030) is
used as a general purpose gross leak detector and is
factory tested and certified. It is shipped from the
factory with ±35% accuracy. If more accurate
detection is needed, gas-specific versions are
available (see Table 1-2), which are factory certified
and calibrated to the target refrigerant.
The broadband gas detector combines refrigerants
into three groups shown in Table 1-1. Measurement
performance is based on an average response profile
for all of the gases within the group.
1See Section 5, Configure the Gas Detector for information on
Parameter 11 and other configuration instructions.
NOTE: Greater accuracy may be achieved
through the use of calibration gas and the
adjustment procedure detailed in Section 6,
Functional Tests and Adjustments.
Group # Value for
Param 111Refrigerant
1 P.-11 = 1
R123
R134a
R404a
R407a
R407c
R407f
R410a
R427a
R507
HFO1233ZD
R448A
R449A
2P.1-11 = 2
R422a
R422d
HFO1234YF
HFO1234Ze
R452A
R513A
3 P.-11 = 3 R22
4 P.-11 = 4 R32
Table 1-1 Broadband Gas Groups

2 • MRLDS-250 Gas Detector Manual 026-1315 Rev 2 11-APR-2017
Figure 1-2 Broadband Gas Groups 1-3
1.2.3. Detecting Specific Gases
Each gas-specific gas detector is shipped factory
calibrated to its specific target refrigerant. Refer to
Figure 1-3 and Table 1-2.
Figure 1-3 Gas-Specific MRLDS-250 Gas Detectors
1See Section 5, Configure the Gas Detector for Information on
Parameter 11 and other configuration instructions.
Part Number Refrigerant1Accuracy
809-0031 R22 ±3%
809-0034 R404a ±3%
809-0035 R407a ±3%
809-0040 R422d ±3%
Table 1-2 Gas-specific Detector Measurement Performance
NOTE: Gas-specific detectors can be re-
calibrated in the field to new target gases. Use
optional calibration instructions in Section 6,
Functional Tests and Adjustments for
increased accuracy when detecting new target gas that
is different from the “as shipped” target gas. Refer to
the example in Table 1-3.
As Shipped
Part number 809-0031 (R22) is factory
calibrated to R22.
Changed
Gas Type
(Reduced
Accuracy)
The gas detector may be changed to respond to
any of the other listed refrigerants (see
parameter P.-11, in Section 5.2., Setting
Parameters). If changed, the gas detector will
have a lower accuracy for the target refrigerant
(without calibration).
Table 1-3 Changing Gas Types and Accuracy

Remote Controller Options Introduction • 3
1.3. Remote Controller
Options
The MRLDS can connect to any controller
through the standard analog output (voltage and
current; see Table 1-5 for options) such as the
standard alarm relay.
1.4. Parts List
Table 1-4 shows a list of components that are
available.
1.5. Specifications
For default values, refer to Section 5.2., Setting
Parameters.
1When filtering is disabled (see parameter P.-19 in Section
5.2.2., Configuration Parameters), the unit will respond to con-
centrations sub-10 PPM.
Optional
Recalibra-
tion
(For
Improved
Accuracy)
By applying calibration gas containing the
new target refrigerant, and via the routine
described in Section 6.4., Adjustment Using
Calibration Gas, the gas detector may then be
adjusted to respond with the calibrated
accuracy as shown in Table 1-2 for the new
target refrigerant.
Part Number Description
809-0030 MRLDS, Broadband
809-0031 MRLDS, Calibrated to R22
809-0034 MRLDS, Calibrated to R404A
809-0035 MRLDS, Calibrated to R407A
809-0040 MRLDS, Calibrated to R422D
809-0041 MRLDS, Calibrated to R448A
809-0042 MRLDS, Calibrated to R449A
809-0043 MRLDS, Calibrated to R513A
603-1100 Splash Guard
026-1315 Installation and Operation Manual
Table 1-4 Parts List
Table 1-3 Changing Gas Types and Accuracy
Specification Description
Power Supply 24 VDC, 24 VAC 50/60 Hz,
2.5 W max
Power Monitoring Green LED
Visual Alarm Red 4-digit LED display
Audible Alarm Buzzer (audible alarm), enable/disable
(Default enabled)
Fault Monitoring Fault codes presented to user
Analog Outputs 4-20 mA; 0-5V; 0-10V; 1-5V; 2-10V
(Default 1-5V)
Relay 1 relay rated 1 A @ 24 VAC//VDC
(0.5A, 125V AC UL rating)
Range 0-3500 PPM
Squelch1Readings below 75 PPM are squelched
by default
Alarm Delay Selectable: 0 to 15 minutes
(Default, 0)
IP Rating Not IP rated. An accessory splash
guard is available for areas requiring
additional protection from wash down.
Response Time,
T90
Five (5) minutes
Temperature
Rating
-22°F to 10°F (-30°C to 40°C)
Humidity and
Elevation
5-90% relative humidity, non-
condensing, 0-10,000ft. altitude
Standard
Dimensions and
Weights
4.0” x 5.5” x 1.5” 6.3oz.
102 x 140 x 37mm 180g
Approvals CE, MET/IEC/EN 61010-1
Table 1-5 Specifications

4 • MRLDS-250 Gas Detector Manual 026-1315 Rev 2 11-APR-2017
2 Mounting the
Gas Detector
2.1. Warnings and
Prerequisites
2.2. Mounting Locations
2.2.1. General Placement Guidelines
Gas detectors must be located within the
appropriate wire lengths from the central control unit
(if used).
2.2.2. Machinery Rooms
There is no absolute rule in determining the
number of gas detectors and their locations. However,
a number of simple guidelines can help in making a
decision. Gas detectors monitor a point as opposed to
an area. If the gas leak does not reach the detector, no
alarm will be triggered. Therefore, it is extremely
important to select the gas detector location carefully.
Also consider ease of access for maintenance.
The size and nature of the site can help in deciding
which method is the most appropriate to use.
Locations requiring the most protection in a
machinery or plant room would be in close proximity
to compressors, pressurized storage vessels,
refrigerant cylinders, storage rooms, or pipelines. The
most common leak sources are valves, gauges,
flanges, joints (brazed or mechanical), and filling or
draining connections.
• In machinery rooms where there is little or no
airflow, placement options are:
• Point Detection: where gas detectors are located as
near as possible to the most likely sources of
leakage, such as the compressor, expansion valves,
mechanical joints, or cable duct trenches.
• Perimeter Detection: where gas detectors
completely surround the area or equipment.
WARNING: Explosion hazard! Do not mount
the MRLDS-250 in an area that may contain
flammable liquids, vapors, or aerosols.
Operation of any electrical equipment in such
an environment constitutes a safety hazard.
CAUTION: The MRLDS-250 contains
sensitive electronic components that can be
easily damaged. Do not touch or disturb any of
these components.
NOTE: The mounting location of the monitor
should allow it to be easily accessible for visual
monitoring.
NOTE: The monitor must be connected to a
marked, suitably located and easily reached
switch or circuit breaker as a means of
disconnection.
CAUTION: Connect monitor power and sig-
naling terminals using wiring that complies
with local ethical codes or regulations for the
intended application.
CAUTION: Do NOT mount the MRLDS-250
directly to vibrating machinery as the
vibrations may degrade the gas detector’s
performance.
NOTE: The MRLDS-250 should be installed
plumb and level and securely fastened to a
rigid mounting surface.
NOTE: When installed in areas that may be
subjected to water spray, the optional splash
guard (P/N 603-1100) should be used in
conjunction with the MRLDS-250.