Overview
Introduction • 1
1
Introduction
1.1.
Overview
The MRLDS-250 NDIR (non-dispersive infrared) is a
state-of-the-art 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
accuracy as shown in
Table 1-1
(gas dependent). If
more accurate detection is needed, gas specific
versions are available, which are factory certified and
calibrated to the target refrigerant.
The broadband gas detector combines refrigerants
into 4 groups shown in
Figure 1-2
. Measurement
performance is based on an average response profile
for all of the gases within the group.
Table 1-1
Broadband Gas Groups
Group#
Value
for
Param
11
1
Refrigerant
As
Shipped
Accuracy
1
P.-11 = 1
R134a
±25%
R404a
±35%
R407a
±25%
R407c
±20%
R407f
±20%
R410a
±20%
R427a
±15%
R452B
±40%
R507
±35%
HFO1233ZD
±35%
2
P.1-11 = 2
R448A
±40%
R449A
±40%
R422a
±25%
R422d
±20%
HFO1234YF
±25%
HFO1234Ze
±25%
R452A
±25%
R513A
±35%
R514A
±20%²
3
P.-11 = 3
R22
±25%
4
P.-11 = 4
R32
±35%