Det-Tronics EQP Fire and Gas Detection/Releasing System - Manual (Page 19)

14.1 95-8533 2-13
EQ22xxDCu and EQ22xxDCuEX
Digital Communication units
The EQ22xxDCU Digital Communication Unit (DCU) is
an analog signal input device that accepts a 4 to 20
milliampere signal. The device is typically connected
to gas detectors, where the analog signal represents
the gas concentration.
Calibration of the DCU involves a non-intrusive
procedure that can be performed by one person at
the device without declassifying the area.
The device supports two alarm setpoints that are
defined as part of the device’s configuration setup.
When detecting combustible gases, the alarm
setpoints represent low and high gas alarm levels.
When detecting oxygen, the alarms represent the
range for the acceptable oxygen level. If oxygen
drops below the alarm range, a low alarm is
generated by the device.
PointWatch/DuctWatch IR gas detector as well as
electrochemical sensors (hydrogen sulfide, carbon
monoxide, chlorine, sulfur dioxide, and nitrogen
dioxide) are examples of devices that can be
connected to the DCU.
note
A catalytic sensor can be connected to a DCU
through a transmitter, which converts the millivolt
signal to a 4 to 20 milliampere signal.
The EQ22xxDCUEX is a specialized version of the
DCU that contains a transmitter for connection to a
Det-Tronics Model CGS catalytic combustible gas
sensor.
Refer to the EQ22xxDCU Specification Data sheet
(form number 90-1118) for additional information.
piRECL pointWatch Eclipse
The Pointwatch Eclipse
® Model PIRECL is a diffusion-
based, point-type infrared gas detector that provides
continuous monitoring of combustible hydrocarbon
gas concentrations in the range of 0 to 100% LFL.
The LON supervision meets Signaling Line Circuit
(Class X) requirements per NFPA72: 2010 for the
Model PIRECL.
For PIRECL installation, operation, maintenance,
specifications and ordering information, refer to form
number 95-8526.
note
the low alarm range for the eQP PIReCL is
5-40% LFL (the standard PIReCL is 5-60% LFL).
For information regarding USCG Approval of the
PIRECL Detector, refer to Appendix D.
opECL open path Eclipse
The Open Path Eclipse
™ Model OPECL is an open
path infrared gas detection system that provides
continuous monitoring of combustible hydrocarbon
gas concentrations in the range of 0 to 5 LFL-meters,
over a distance of 5 to 120 meters.
The LON supervision meets Signaling Line Circuit
(Class X) requirements per NFPA72: 2010 for the
Model OPECL.
For OPECL installation, operation, maintenance,
specifications and ordering information, refer to form
number 95-8556.
uD10 DCu Emulator
The FlexVu
® Model UD10 DCU Emulator (UD10-DCU)
is designed for applications that require a gas detector
with digital readout of detected gas levels. Its LON
interface board makes the UD10-DCU compatible with
Eagle Quantum Premier systems by digitizing the 4-20
mA analog signal from the attached sensor/transmitter
and transmitting the value as a process variable over
the LON to the EQP controller. The UD10-DCU is
designed for use with most currently available
Det-Tronics gas detectors.
For a list of compatible gas detectors, as well as
information regarding installation, operation,
maintenance, specifications and ordering information,
refer to form number 95-8656.