MRLDS-250
Quick Setup Guide
The Modular Refrigeration Leak Detection Sensor is
Emerson’s state-of-the-art infrared refrigerant gas
detector that can detect a wide range of gases. The
MRLDS-250 can be used on a stand-alone basis or
integrated into supervisory controls. The MRLDS-250
can be used in locations that require continuous
monitoring and to add gas detection solutions to an
existing system.
MRLDS-250 Installation
Mounting the MRLDS-250
1. To open the housing as received, use a flat blade
screwdriver and depress the top latch. While pushing
the latch, grasp the back edge of the housing near the
latch and pull the back away.
2. Position the base to the pre-determined mounting
location.
3. For Wall Mount, attach the MRLDS-250 base to the
mounting surface using two #6 screws (provided)
through two of the seven mounting holes
MRLDS-250 base to the junction box through the two
junction box holes.
The MRLDS-250 is available in two versions:
•
The broadband gas detector is used as a general
purpose gross leak detector and is factory tested and
certified to +/- 35% accuracy.
•
The gas specific versions come factory certified and
calibrated with +/- 3% accuracy to the target refrigerant
when there is a need for more accurate detection.
Figure 1 - MRLDS-250 Components
Figure 2 - Front and Back of the MRLDS-250 Base
For complete part number and installation information, see
the full MRLDS-250 manual (P/N 026-1315).
Document Part # 026-4413 Rev 2
Page 1 of 4
©2018 Emerson Climate Technologies Retail Solutions, Inc. This document may be photocopied for personal use.
NOTE: Be sure to enable the termination resister on the
3. Set the desired address by pressing Up
or Down
and press the Enter
button to save.
4. For the Baud Rate, look for the P.-13 parameter then
press the Enter
button.
5. Select 00 for 9600 Baud or 01 for 19200 Baud. Press
the Enter
button to save.
How to Add an MRLDS-250 to the E2 Controller
1. MRLDS-250 is only native on E2 Enhanced Controllers
with firmware version 4.08F03; otherwise you need to
add a description file and license key.
2. Contact Customer Service to obtain a license key:
a. Phone Number: 770-425-2724 Option 4
Figure 7 - Termination Resister Setting
Set Up Analog Output Type and Scaling
1. For Analog Output, look for P.-03 on the parameter list
3. Add the description file using UltraSite.
4. Reboot the controller after the upload.
5. Load the license key on the E2 by logging in and then
press , ,.
then press the Enter
2. Set the desired output by pressing Up
to select the type designated as follows:
button.
or Down
6. Press F1 for ADD FEATURE and enter the License Key.
•
•
•
•
•
00 Selects 0-5V
7. Add the MRLDS-250 by pressing , ,,to
01 Selects 1-5V (Default)
02 Selects 0-10V
access Connected I/O Boards and Controllers.
8. Press F2 twice to select C4: Third Party tab.
03 Selects 2-10V
9. Scroll down to MGS250 and enter the quantity of
04 Selects 4-20mA
MRLDS-250 devices up to the maximum indicated.
10. Press the button to save.
3. Press the Enter
button to save.
4. For Scaling, look for P.-16 on the parameter list then
11. Press , ,,for Network Summary or
+.
press the Enter
button.
5. This will allow you to select the full scale PPM value that
represents the maximum analog output (for example:
1000PPM = 5V when 1-5V output range was selected
12. Scroll down to the MGS250 and press F4 for
COMMISSION.
13. Select the address the MRLDS-250 is set to and press
to confirm.
for P.-03). Use Up
or Down
to adjust the value
and set it to 1000PPM.
14. The MRLDS-250 should be Online on the E2 Network
Summary (press +).
6. Press the Enter
button to save the setting.
How to Configure Alarm Setup on the E2
Controller
MRLDS-250 Modbus Setup
Setting Up Modbus Address and Baud Rate
1. Press , and then select MGS250.
2. Press F5 for SETUP and F2 to select C2: Set Points.
3. Set the parameters depending on the System
Requirement and press the button to save.
1. Press and hold the
information button for five
seconds to activate the parameter list.
2. For the Address, look for P.-10 on the parameter list
then press the Enter
button.
Document Part # 026-4413 Rev 2
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©2018 Emerson Climate Technologies Retail Solutions, Inc. This document may be photocopied for personal use.
MRLDS to MultiFlex I/O
How to Set a MultiFlex Input Point
1. An input point on a MultiFlex board consists of two terminals. One of these terminals labeled as SIG reads the signal from
the sensor, while the other, labeled 0v is where the sensor ground wire is connected:
Figure 8 - MultiFlex Input Point
2. The Analog Output Signal (+) should go to (SIG) terminal of the MultiFlex board and the Ground (GND) should go to (0v)
terminal of the board.
3. The DIP switch setting of the MultiFlex board terminal for the MRLDS-250 should be in the OFF position
Figure 9 - MultiFlex Input Dip Switches
How to Set the Input Type on the E2 Controller
1. Press , ,to go to the Input Status Screen.
2. Select the input point where the MRLDS-250 is connected, and press F1 for SETUP. Press for Analog.
3. Highlight Sensor Type and press F4 for LOOK UP. Select Linear and press to confirm.
4. Navigate down to Eng Units and press F4 for LOOK UP. Select PPM 33 and press to confirm.
5. Set the Low End Point and HighEnd Point equivalent to the range set on P-.03 for Analog Output.
6. Set the Low End EU and the High End EU equivalent to PPM Scaling set on P.-16.
7. For the Low End Limit, set it to -10% of Low End EU and for the HighEnd Limit, set it to +10% of
High End EU.
8. Press the button to save.
Document Part # 026-4413 Rev 2
Page 4 of 4
This document may be photocopied for personal use.
For Technical Support call 770-425-2724 or email [email protected]
The contents of this publication are presented for informational purposes only and they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described
herein or their use or applicability. Emerson 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.
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