PDC-W Multi-Channel Controllers0 pages

Controllers - GAS DETECTION DATASHEET

PDC-W Multi-Channel Controller
technical drawing

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

14”

12”

The PDC Multi-Channel Controller is available in a water tight housing that
offers protection in wet environments. The programmable analog or digital
controller is designed to handle a large number of remote transmitters
and perform a wide range of control functions. The micro-controller based
circuit provides the user with an almost unlimited range of configuration
possibilities including sensor types, simple or complex zoning, changing
alarm set points, time delays on make or break and relay addressing. The
PDC controller can accept inputs from up to 8 analog transmitters or can
handle up to 120 digital transmitters on a RS485 communication bus.
The controller has a two line backlit LCD display that actively scrolls through
all programmed channels and displays the gas name, concentration and
alarm status. The PDC features LED alarm indicators, audible alarm with
silence button, and RoHS compliant circuit boards.
Use with any CETCI analog or digital transmitters. Each PDC is preprogrammed at the factory, and is completely field adjustable using a
boardmounted push button keypad.

KEY FEATURES
» Up to 8 analog transmitters or up to 120 digital transmitters
» RS485 communication with digital transmitters
» RoHS compliant circuit boards
» Relay output modules
» Scrolling, two line LCD display
» LED alarm indicators
» Completely field programmable
» Low, mid and high alarm setpoints
» Audible alarm with silence button
» Four wire daisychain wiring
» Eight onboard SPDT relays
» CSA & UL certified

APPLICATIONS

8”

sample engineering specifications
Carbon Monoxide & Combustible Gas Transmitters for Parking Garages
Provide digital transmitters with continuous, linear, signal capable
of being connected to model PDC series controller on a RS-485
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 wiring, conduit and interconnection
required for a successful installation. System should be tested and
commissioned after installation, with a report provided after the site
visit.
More specification samples are available at
www.critical-environment.com.

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