O
1/27/2021
Kele, Inc. • 3300 Brother Blvd. • Memphis, TN 38133
4
O
PERATIONAL
D
ESCRIPTION
The K-O2 is a ventilation and alarm con
and operates a Warning/Ventilation contact closure that can be used to
levels of oxygen are detected. If the oxygen
contacts is operated to trigger an alarm.
The gas sensor is a calibrated module that
while leaving the main control mounted and wired
The front cover has an LED status indicator
Warning/Ventilation (yellow), and Alarm
operational. While the LED is blinking red, t
The concentration of oxygen in the ambient air is
percent by volume. The analog output range
4.1 S
PECIAL
M
ODES
The K-O2 operates in several modes as shown in
Normal operation is as described above. During standby
mode the sensor is stabilizing and analog output is held at
20 mA.
During span calibration the sensor’s sensitivity is
compared to its sensitivity at initial factory calibration.
its sensitivity has fallen below manufacturer’s specification
the K-O2 goes into Sensor Expired mode with the analog
output held at 4 mA and only the Warning/
FIGURE 7: FRONT COVER STATUS LED
OS-2 Oxygen Sensor
Kele, Inc. • 3300 Brother Blvd. • Memphis, TN 38133
Status LED Color
Operational
Status
Description
Concentration
the
warning/ventilation
threshold.
outputs are active.
Concentration is below
the
warning/ventilation
threshold and above the
alarm
threshold.
Warning/ventilation relay
is active.
Concentration is below
the alarm threshold.
warning/ventilation and
alarm relays are active
End of Life warning.
Sensor has reached the
end of its rated service life
and should be replaced.
Relays
and
analog
outputs
continue
to
function normally.
Sensor
Failure.
Warning/ventilation relay
is active and analog
output
is
4
mA.
(refer to Section
Table 5:
Front panel status LED Indications
during normal operation..
ESCRIPTION
is a ventilation and alarm controller that senses the oxygen concentration in the ambient space around it
contact closure that can be used to operate ventilation fans when
oxygen concentration approaches unsafe levels, a second set of alarm
contacts is operated to trigger an alarm.
a calibrated module that can be replaced with minimal effort when it reaches
while leaving the main control mounted and wired (refer to
Section 7.1
).
indicator that illuminates in different colors to indicate normal
larm (red) conditions. Blinking red indicates that the sensor is NOT
operational. While the LED is blinking red, the analog output is delivering 4 mA to indicate the error.
in the ambient air is reported at the controller’s analog current-loop
analog output ranges from 5 to 20mA (refer to Table 2 and Table 3).
O2 operates in several modes as shown in Table 7.
Normal operation is as described above. During standby
nalog output is held at
r’s sensitivity is
compared to its sensitivity at initial factory calibration. If
its sensitivity has fallen below manufacturer’s specification
mode with the analog
the Warning/Ventilation relay activated.
ED
Page 5 of 14
Operational
Status
Description
oncentration is above
the
warning/ventilation
No relay
outputs are active.
Concentration is below
the
warning/ventilation
threshold and above the
alarm
threshold.
Warning/ventilation relay
Concentration is below
the alarm threshold.
Both
warning/ventilation and
alarm relays are active
.
End of Life warning.
Sensor has reached the
end of its rated service life
and should be replaced.
Relays
and
analog
outputs
continue
to
function normally.
Sensor
Failure.
Warning/ventilation relay
is active and analog
output
is
4
mA.
Section 7)
tus LED Indications
during normal operation..
the ambient space around it
fans when reduced
safe levels, a second set of alarm
end-of-life (EOL),
normal (green),
Blinking red indicates that the sensor is NOT
mA to indicate the error.
loop output as
