RKI Instruments Beacon 110 - Manual (Page 24)

20 Beacon 110 Operator’s Manual
Chapter 4: Operation
Overview
This chapter describes the Beacon 110 in normal operation. This chapter also describes
the Beacon 110 in alarm 1, alarm 2, and fail conditions and suggests response to these
conditions.
Normal Operation
Normal operation is defined as follows:
• The start-up procedure is complete.
• The Beacon 110 is not indicating an alarm 1, alarm 2, or fail condition.
• The Beacon 110 is not in Calibration, Configuration, or Input Mode.
During normal operation, the Beacon 110 simultaneously displays the current gas reading,
unit of measure, and target gas. The example below illustrates a typical LEL Beacon 110.
4 - 20 mA Signal Output Operation
The output at the 4 - 20 mA output terminals is a 4 - 20 mA signal that is proportional to the
detection range of the Beacon 110. 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 110 is in its warm-up period, the signal output will be fixed at 4 mA
(zero) for all gas types except oxygen. For oxygen types, the output will be fixed at
17.4 mA (20.9% oxygen) while the Beacon 110 is in warm-up.
• When the Beacon 110’s gas type is changed, the Beacon 110 will enter Configuration
Mode for you to verify the parameter settings. When you exit Configuration Mode, the
display will indicate NEEDS CALIBRATION and will continue to indicate this until
Calibration Mode is entered and a calibration is performed. In this situation, the signal
output will be fixed at 3.5 mA for all versions other than oxygen and 17.4 mA for
oxygen versions from the time Gas Type Mode is entered until the Beacon 110 is
calibrated and returns to normal operation.
• If you enter Calibration Mode, Configuration Mode, or Gas Type Mode, the signal
output will be fixed at 3.5 mA for all versions other than oxygen and 17.4 mA for
oxygen versions until the Beacon 110 returns to normal operation.
• If the Beacon 110’s input power decreases below 18.5 volts so that the Beacon 110 is
in a low power alarm, the signal output is fixed below 2.4 mA until the low power alarm
is cleared.
METHANE
0 %LEL