INSTRUCTIONS
FlexVu
®
Explosion-Proof
Universal Display Unit
Model UD20
Im porta n t
Be sure to read and understand the entire
instruction manual before installing or operating
the gas detection system. The Model UD20 is to
be used with GT3000 or PIRECL gas detectors
to provide early warning of the presence of a gas
mixture. Proper device installation, operation,
and maintenance is required to ensure safe and
effective operation. If this equipment is used in
a manner not specied in this manual, safety
protection may be impaired.
ApplicAtion
The FlexVu
®
Model UD20 Universal Display Unit is
designed to be used with the GT3000 Toxic Gas
Detector or PIRECL Combustible Gas Detector.
The UD20 functions as a pass through device, reading
the linear 4-20 mA dc output signal from the gas
detector. The detected gas concentration is indicated
on an alpha-numeric display. The UD20 automatically
detects the gas type and operating range of the sensor
to which it is connected via the HART signal.
All electronics are enclosed in an explosion-proof
aluminum or stainless steel housing. The display unit
is used with a single gas detector, which may be either
directly coupled to the display unit, or remotely located
using a sensor termination box. The UD20 features
non-intrusive calibration, which can be performed by
using a handheld magnet to activate internal magnetic
switches on the faceplate. Calibration can also be
performed by activating the gas detector’s internal
magnetic reed switch with a magnet.
Description
The UD20 provides display and control capabilities for the
GT3000 or PIRECL detector, and uses the following I/O:
Signal Inputs: 4-20 mA loop with HART,
from the gas detector
User Inputs: Magnetic switches (4),
on the display panel
Visible Outputs: LCD display
Signal Pass Through: 4-20 mA loop with HART,
from the gas detector
HART COMMUNICATION
The UD20 is a HART primary master and communicates
with the gas detector, which is a HART slave device.
Upon power-up, the UD20 requests the gas type,
measurement range, and unit of measure from the gas
detector. During normal operation, the UD20 continually
polls the gas detector for status information. Because
the UD20 is a primary master, a secondary master can
also be used to communicate with the gas detector at
the same time. If an Asset Management System (AMS)
is used, it should be configured as a secondary master
to avoid communication conflicts with the UD20.
4.1 ©Detector Electronics Corporation 2016 Rev. 6/15 95-8620
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