Det-Tronics Eagle Quantum Premier - Digital Communication Units; Eq22 Xxdcu and Eq22 Xxdcuex; UD10 DCU Emulator

2-16
95-8533
18.2
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.
The UD10-DCU with CGS with conditioning
board is designed for use with combustible
gas, see manual 95-8656 for more information.
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.
EQ22xxDCU and EQ22xxDCUEX
Digital Communication Units
The EQ22xxDCU Digital Communication
Unit (DCU) is an analog signal input device
that accepts a 4–20 mA 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 4–20
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.
Figure 2-19—Initiating Device Circuit