Line of Sight Infrared Hydrocarbon Gas Detector AutroPath HC800 , 116-P-HC800/IGB, Rev. A, 2016-03-03
P/N 95-8744, v4.2 , rev. 3/16
Autronica Fire and Security AS
Page 4
oPtIoNAL ReLAyS
The AutroPath HC800 can be furnished with factory
installed relays — two programmable alarm relay
outputs and one fault relay output. All relays are sealed
and provide form C (NO/NC) contacts. The high and
low alarm relays are programmable, and can be set
for latching / non-latching operation, and a normally
energized / de-energized coil (see Table 3). The low
alarm cannot be set above the high alarm threshold.
Alarm configuration can be done with the HART or
Modbus interface. The onboard multi-color LEDs
indicate a LOW alarm condition via a flashing red
color, and a HIGH alarm condition via a steady red
color. Latched alarms can be reset using the internal
magnetic switch, an external switch connected to the
calibration line terminal, a HART Field Communicator,
or Modbus communication. A short-duration magnetic
switch activation of one second will reset latched
alarms. Holding the magnetic switch closed for a three
second duration will start the calibration sequence.
When the optional relays are ordered, the AutroPath
HC800 receiver is certified for Ex d operation.
oPtIoNAL CommuNICAtIoN LINk
By connecting the transmitter and receiver via a three-
wire shielded cable, an optional “communication link”
can be created between the two devices.
The communication link offers the following advantages:
1. Single point system diagnostics – The link offers
the ability to view device variables of the receiver
while connected to the transmitter, or vice versa
(using a HART handheld or Modbus device).
These variables include signal strength, status,
and configuration parameters such as alarm set
points, heater settings, gas type, etc.
2. Dynamic lamp power – The link enables the sys-
tem to optimize lamp power per the application.
This optimization only happens during the zero
calibration process.
3. Synchronized LEDs on each device can signal a
common system status condition. Without the link,
the transmitter is unable to signal alarm status.
4. Transmitter variables can be configured via con-
nection to the receiver. Configurable transmitter
variables include lamp power and heater settings.
NoTe
Alarm setpoints in the receiver cannot be changed
from the transmitter.
5. The communication link provides the ability to
initiate Calibration from either the transmitter or
receiver.
For retrofit applications where an inter-connecting wire
is not available or possible, the system can operate
without the link. If the link is not connected, the system
will not indicate a “link fault.”
A “link fault” feature can be enabled (using a HART
handheld or Modbus device), which will indicate a fault
if the link is broken. The “link fault” can only be detected
and annunciated by the receiver.
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The default setting for the ”link fault” feature is
Disabled.
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All third-party performance and hazardous
location approvals apply with and without the
communication link connected.
HIStoRy LoGS
Non-volatile memory is provided in the receiver to save
a record of the 100 most recent calibrations and 1000
most recent alarm/fault events. Operating temperature
and voltage of the receiver are also recorded with
each event log. A real time clock is provided for time
stamping events. This information is accessible using
HART or Modbus communication.
