RKI Instruments Beacon 100 - Manual (Page 27)

Beacon 100 Gas Monitor Operator’s Manual Calibration Program • 27
NOTE: Once you leave normal operation and enter this screen, if any alarm conditions
were occurring when you left normal operation, they will be retained by the
Beacon 100 until you return to normal operation. If an alarm condition no longer
exists when you return to normal operation, press the reset switch to reset
alarms.
4. Press the UP or DOWN button to make the cursor blink in front of CALIB, then press
the ENTER button to enter the Calibration Program.
The display screens that follow and the calibration procedure will depend on which
type of detector head is installed on the Beacon 100: 4-20 mA transmitter, non-oxygen
type direct connect, or oxygen type direct connect. Use the appropriate set of instruc-
tions below to calibrate the detector head.
Calibrating a 4-20 mA Transmitter Detector Head
If a 4 - 20 mA detector head is installed, use the following calibration procedure.
1. A screen appears which displays “CALIB MODE” on the top line and the current
reading below it.
NOTE: No reading adjustments can be made at the Beacon 100. All zero and span
adjustments must be made at the detector head. The purpose of entering the
calibration program is to avoid unwanted alarms during calibration.
2. Verify that the detector head is in a fresh-air environment. (If necessary, use a zero-
emission air cylinder, also known as zero air, to introduce a fresh-air sample when
adjusting the zero reading below.)
3. Adjust the detector head’s zero (fresh air reading for oxygen) reading. See the
detector head’s instruction manual for instructions on how to adjust the zero reading
(fresh air reading for oxygen).
4. Apply calibration gas to the detector head’s detector and adjust the detector head’s
span reading (zero reading for oxygen). See the detector head’s instruction manual for
instructions on how to adjust the span (zero reading for oxygen) reading.
5. Allow time for the gas reading to return to normal and then press ESCAPE two times
to return to normal operation.
NOTE : If you do not allow the gas reading to return to normal, then unwanted alarms
may occur.
Calibrating a Direct Connect Detector Head, Non-Oxygen Type
If a non-oxygen type direct connect detector head is installed, such as combustible gas or
carbon monoxide, is installed, use the following calibration procedure.
1. The ZERO/SPAN screen appears and allows you to choose between ZERO and
SPAN. If necessary, press the UP button to make the cursor blink in front of ZERO,
then press ENTER. The screen will indicate the current reading.
2. Verify that the detector head is in a fresh-air environment.
If the detector head is not in a fresh air environment, use a zero-emission air calibra-
tion cylinder, also known as zero air, to introduce a fresh-air sample before continu-
ing. See the detector head operator’s manual for instructions to apply zero air.