Det-Tronics Eagle Quantum Premier - Calibration Algorithm D for Universal Dcus; Normal Calibration; Sensor Replacement; Sensor Replacement - Toxic Gas

5-5
95-8533
18.2
Sensor Replacement — Toxic Gas
NOTE
When replacing a sensor, compare
part numbers to be sure the correct
replacement sensor is being used.
WARNING
The hazardous area must be
de-classied prior to removing a junction
box cover with power applied.
1. Remove the cover from the DCU
enclosure.
2. Press the Sensor Replacement Switch
on the communication module for
approximately one second. (The calibrate
LED flashes, indicating it is ready for the
zero input.)
NOTE
Pressing the Sensor Replacement
Switch prevents the communication
module from generating a fault signal
when the input drops to zero due to
sensor removal. The calibration will not
be aborted if the calibration procedure is
not completed within 12 minutes.
3. Replace the sensor.
4. Wait at least five minutes for the sensor
output to stabilize.
5. Activate the reed switch. (The red LED
flashes for three seconds while the switch
is activated.) The communication module
records the uncalibrated value in position
one of the calibration log and calibrates
the zero value. (The calibrate LED stays on
steady.)
6. Apply the calibration gas. (The calibrate
LED flashes when the input increases.)
7. Activate the reed switch. (The red LED
flashes for three seconds while the switch
is activated.)
8. The communication module records the
uncalibrated value in the first register
of the calibration log and calibrates the
span value. (The calibrate LED stays on
steady.)
9. Remove the calibration gas and replace
the DCU enclosure cover.
10. The communication module waits until the
analog value drops below 4% full scale.
The calibration is complete. (The calibrate
LED turns off.)
NOTE
Pressing the Sensor Replacement
Switch aborts the calibration and starts
over.
CALIBRATION ALGORITHM D
FOR UNIVERSAL DCU
s WITH O
2
SENSOR
Normal Calibration
1. Apply clean air (20.9% oxygen).
2. Activate the reed switch for at least four
seconds. (The red LED flashes for three
seconds while the switch is closed.)
3. The calibrate LED flashes, indicating
calibration has begun.
4. The communication module waits three
seconds.
5. The communication module records the
uncalibrated value in the calibration log
and calibrates the span value.
6. The calibrate LED stays on steady.
7. The communication module waits three
seconds.
8. Calibration is complete. (The calibrate LED
turns off.)
Sensor Replacement
WARNING
The hazardous area must be
de-classied prior to removing a junction
box cover with power applied.
1. Open the junction box cover and press the
Sensor Replacement Switch.
2. The calibrate LED on the communication
module flashes, indicating it is ready for
the zero input.
3. Replace the sensor and set the Sensor
Switch (located on the sensor cell) to
zero.