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%
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