Emerson MRLDS - Manual (Page 7)

Specifications Overview • 1
1 Overview
CPC specs a modular refrigerant leak detection sensor
(MRLDS) that continuously monitors for low levels of
refrigerants most commonly used in commercial refrigera-
tion systems.
The MRLDS communicates with the E2 controller via
a Gateway board connected to the RS485 I/O Network, or
via the analog input on a MultiFlex board.
1.1 Specifications
*De-icer: for environments below 32°F to keep ice from
forming on the surface of enclosure.
1.2 MRLDS Models
1.3 Powering The MRLDS
The MRLDS unit requires a separate UL Listed/CSA
Certified 24VAC Class 2 transformer power supply. One
24VAC, 10VA Class 2 transformer is sufficient for up to
three (3) MRLDS units.
CPC supplies several sizes of transformers for power-
ing multiple MRLDS units (three or more). Note that
polarity must be maintained when connecting more than
one MRLDS to a single transformer.
Power Require-
ments 24 VAC, ±20%, 50/60 Hz, Class 2
Wiring 14 AWG max, Class 2 copper wir-
ing
Power Consump-
tion Less than 2.7 watts
Output Options 1-5V, 10 K Ohm load
RS485 Modbus RTU
Operating Temp. 32 to 149°F (-22 to 149°F with
de-icer*)
0 to 65°C (-30 to 65°C with
de-icer*)
Humidity 0 to 99% non-condensing
Size 4.5” x 3.5” x 1.6”
Weight .35 lbs. (160 g)
Pollution Degree 2
Installation Cate-
gory II
Range 0 to 1000 ppm
Minimum Detec-
tion 25 ppm
Pressure Operating 10.2 to 15.7 PSIA
Repeatability ±10 ppm at 50 ppm
Linearity ±10 ppm from 25-50 ppm,
±20% of reading from 60 to 1000
ppm
Warm-up Time 30 minutes
Table 1-1 - MRLDS Unit Specifications
Figure 1-1 - Sensor Base Opening With Screw Terminals
Part Number Description
809-1000 Voltage Out w/o de-icer*
809-1001 Voltage Out w/ de-icer*
809-1010 Modbus w/o de-icer*
809-1011 Modbus w/ de-icer*
Table 1-2 - Available MRLDS Models
Part Number Transformer
Description
Number of
MRLDS Units
Powered
640-0039 24VAC, 10VA
Class 2
Up to 3
Table 1-3 - MRLDS Transformer Specifications
WARNING: The MRLDS unit must be always
be powered by either a suitable UL 60950/CSA
Certified power supply that is isolated from line
voltage by double insulation, or an appropriately rated
UL Listed/CSA Class 2 transformer. Failure to follow
the above can result in serious personal injury or death.