Table of Contents
Advertisement
2
Functional
Overview
2.1. General Description
Refrigerant monitors are specified to support
compliance to federal, state and local safety codes
governing refrigerant emissions. Avoiding significant
refrigerant loss reduces equipment replacement costs,
maintains equipment efficiency, promotes safety, and
protects the environment.
The RLDS provides for the continuous monitoring of
refrigerant gas levels in up to 16 separate test zones or
channels. The instrument is easily programmed to
monitor a variety of gases and independent leak
(small), spill (medium), and evacuation (large) levels
may be designated for each zone. The instrument also
retains a log of previous readings that can be easily
accessed for analysis.
An audible alarm and front panel indicators are
provided to signal alarm and fault conditions, and
relay contacts are provided that can be used to trigger
external alarm devices in the event of a system fault,
or if a leak (small), spill (medium), or evacuation
(large) level of gas is detected. The system also may
be fitted with an optional two-channel 4-20mA
current loop board for connection to remote
monitoring equipment.
The RLDS requires only minor periodic
maintenance such as the occasional replacement of
filters. The monitor incorporates active diagnostics
that continuously monitor the system for proper
operation. A front panel indicator is provided to alert
an operator of system malfunctions, and fault codes
are generated that enable the user to identify the cause
General Description
of the fault. All 800# models of the RLDS come with
the number of line-end filters (plus one extra) to
match the number of zones for each model.
Figure 2-1 - RLDS Front View
2.2. Communication
Options
The RLDS features full two-way communications via
an RS485 interface. MODBUS RTU is the
communication protocol standard and can be
connected directly to an E2, Einstein, or REFLECS
controller.
Please refer to Section 4, Connecting Communica-
tion Devices for a more complete discussion of
communication protocols.
2.3. Understanding
Monitoring Levels
Effective use of this instrument requires an
understanding of what constitutes reasonable alarm
setpoints for the type of gases being monitored.
All AC&R systems leak some refrigerant.
Refrigerant manufacturers define allowable exposure
levels and threshold limit values in units of parts per
million (PPM). In a good "tight" installation these
background levels will be acceptably low and often
do not require corrective action. You can reduce
nuisance alarms and needless service calls if the alarm
levels are set at practical limits.
Functional Overview • 3
Advertisement
Table of Contents
