Chapter 4: operation, Overview, Normal operation – RKI Instruments Beacon 410 User Manual
Page 28: 4 - 20 ma signal output operation
24 • Overview
Beacon 410 Gas Monitor Operator’s Manual
Chapter 4: Operation
Overview
This chapter describes the Beacon 410 Gas Monitor in normal operation. This chapter
also describes the Beacon 410 in alarm 1, alarm 2, alarm 3, and fail conditions, and
suggests responses to these conditions.
Normal Operation
Normal operation is defined as follows:
•
the start-up procedure is complete.
•
the Beacon 410 is not indicating an alarm 1, alarm 2, alarm 3, or fail condition.
•
the Beacon 410 is not running in one of the selection menus or Calibration Mode.
During normal operation, the Beacon 410 simultaneously displays the target gas, unit of
measure, and current gas reading for all active channels. The example below illustrates a
typical Beacon 410 channel allocation.
The PILOT LED is on indicating that the Beacon 410 is receiving incoming power.
4 - 20 mA Signal Output Operation
The output at the recorder output terminals on the detector/transmitter terminal strip for
each channel is a 4 - 20 mA signal that corresponds to the detection range of the Beacon
410. During normal operation, this signal tracks the gas concentration on the LCD.
There are several circumstances where the signal output will not track the display reading
but will behave as follows:
•
When the Beacon 410 is in its warm-up period, the signal output will be fixed at 4 mA
(zero) for all channel types except oxygen. For oxygen channels, the output will be
fixed at 17.4 mA (20.9% oxygen) while the Beacon 410 is in warm-up.
•
When a channel’s input type is changed to a new direct connect type of detector head
in the Input Setup Menu, the display will indicate NEEDS AIR/GAS Cal for that
channel when you exit the Input Setup Menu and enter normal operation and will
continue to indicate this until Calibration Mode is entered and a calibration is
performed. If a custom gas name and range was defined in the Input Setup Menu, the
Beacon 410 will enter the Configuration Menu for you to verify the parameter settings
before continuing to the normal operation and displaying the NEEDS AIR/GAS Cal
message. In this situation, the signal output for the newly configured channel will be
fixed at 0.7 mA until a complete calibration is performed on that channel.
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