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Visual Indicators (Light Emitting Diodes)
The Toxic Detector provides various LEDs for identifying operating conditions. The indicators include a four
digit LED alphanumeric display, a green/red Status LED and a green power LED. These LEDs are visible
through the glass cover of the Uni-Tran transmitter explosion-proof enclosure.
Magnetic Reset Switch
A magnetically activated switch for programming, zeroing, and resetting the Toxic Detector is provided. This
switch is activated by holding the magnet (hanging from the housing) to the side of the housing where
indicated by the label on the transmitter face plate. Activating the magnetic switch for less than one second
will initiate a basic system reset (clear a latched particle alarm). Programming the Toxic Detector is
accomplished by activating the magnetic switch for greater than one second.
Test Jacks
The Toxic Detector is equipped with test jacks to facilitate convenient current loop measurements without
opening the external current loop. To make current loop measurements use the following procedure:
< Insert your current meter leads into the test jacks
< Set external devices to bypass if necessary to avoid unwanted alarm response
< Remove meter leads from test jacks
Outputs
Relays
NOTE:
The fault relay output should not be used to activate an automatic shutdown procedure. The fault
output indicates a potential problem with the Toxic Detector, not an alarm condition.
All relay outputs have SPDT contacts rated 1 amperes at 30 Volts DC or 0.5 amperes at 125 Volts AC. Two
relay outputs are available; one for fault and one for smog alarm. Both of the relays have normally open and
normally closed contacts available at the output terminals.
The fault relay is set for normally energized operation and is non-latching. If a system fault is detected, the
fault relay becomes de-energized. The fault relay is factory set and cannot be altered by you. The smog alarm
relay can be selected for either normally energized or normally de-energized operation and latching/non-
latching.
4-20 mA
A 4-20 mA DC current output is used to transmit the alarm status and fault codes to other devices. This output
can be wired for isolated or non-isolated operation. A 4.0 mA output indicates normal operation; a 20.0 mA