DST Digital Transmitters0 pages

Transmitters - GAS DETECTION DATASHEET

DST Digital Transmitter
technical drawing

F I XE D S YS TE M DATA S H E E T

sample engineering specifications
The rugged, reliable DST digital transmitter offers a variety of sensor
types to detect a wide range of gases, including solid state and
electrochemical.
The standard enclosure is a rugged polycarbonate and an optional
watertight polycarbonate enclosure is available to suit different
applications.
DST transmitters output scaled linear signals on an RS485
communication bus, and feature a thermal resetting fuse, an LED
indicator for power, alarm and fault, RoHS compliant circuit boards, and
an internal “on line” LED.
Automated calibration and other maintenance procedures are simple and
are easily performed in the field.

KEY FEATURES
» RS485 digital output signal
» Wide variety of sensors for all applications
» RoHS compliant circuit boards
» Configured for 4 wire multi-drop wiring
» Thermal resetting fuse
» LED indicator for power & alarm status
» Power requirement 24 VDC nominal
» Simple calibration procedure

APPLICATIONS

Carbon Monoxide & Combustible Gas Transmitters for Parking Garages
Provide digital transmitters with continuous, linear, signal capable of
being connected to a PDC controller on a RS485 communication bus. The
transmitter shall be a CETCI model DST-ECO for Carbon Monoxide and a
model DST-SCB for combustible gases. The transmitters shall provide a
digital signal representing a Carbon Monoxide measurement range of
0 - 200 ppm CO or 0 - 50% LEL Propane (or other Combustibles gases /
vapours). The circuit shall incorporate a long-life HVAC electrochemical
sensor for CO or a long life solid-state sensor for combustibles with
temperature compensation and an automatic resetting thermal fuse for
fault protection.
The transmitter circuit shall be housed in a wall mount, rugged, break
resistant, corrosion resistant, PVC junction box with a secured, hinged
door. The PVC junction box shall have conduit entry ports on the top,
bottom, right side and rear. The circuit shall operate from 24 VDC input
voltage supplied from the controller. Wiring shall be 2 conductors
for low voltage power, and a two wire shielded twisted pair for the
communication bus. Wiring shall be shielded or in conduit.
An optional watertight Polycarbonate enclosure shall be available.
Provide digital signal readings to the controller to allow accurate settings
for fan control at 25 ppm CO or 10% LEL Propane and a secondary alarm
condition at 100 ppm CO or 20% LEL Propane.
The contractor shall provide all required wiring, conduit and
interconnection required for a successful installation.
More specification samples are available at
www.critical-environment.com.

» Parking Garages
» Repair Shops
» Ice Cleaning Machine Rooms
» Pools
» Manufacturing plants
» ... and many more

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