Det-Tronics Eagle Quantum Premier - Initial Installation and Sensor Replacement - Combustible Gas

95-8533
5-4
18.2
7. The calibrate LED stays on steady.
8. Remove the calibration gas.
9. The communication module waits until the
sensor input drops below 4% full scale.
10. The calibration is complete. (The calibrate
LED turns off.)
NOTE
If the calibration procedure is not
completed within 12 minutes, calibration
will be aborted and the detector will
revert back to the previous calibration
values. The red LED will ash and the
calibration will be logged as aborted.
Initial Installation and Sensor
Replacement — Combustible Gas
(CGS Sensor)
NOTE
When replacing a sensor, compare part
numbers to be sure that the correct
replacement sensor is 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 DCUEX
enclosure.
2. Press the Sensor Replacement Switch
on the communication module for
approxImately one second. (The calibrate
LED on the communication module
flashes, indicating that 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. Move the Calibration Switch to the
“calibrate” position.
4. Replace the sensor.
5. Connect a volt meter to the test points on
the transmitter board. Connect the “+” lead
to TP1 (red). Connect the “–” lead to TP2
(black).
6. Wait at least five minutes for the sensor
output to stabilize, then adjust R2 for a
reading of 0.40 Vdc (4 mA) on the meter.
NOTE
Do not make adjustments to R1 when
calibrating the sensor.
7. Move the Calibrate Switch to the “normal”
position.
8. Activate the reed switch for four seconds.
(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 goes on
steady.
9. Move the Calibration Switch to the
“calibrate” position.
10. Apply the calibration gas and wait for the
output to stabilize.
11. With 50% LFL calibration gas applied to
sensor, adjust R3 for a reading of 1.2 Vdc
(12 mA) on the volt meter.
12. Move the Calibrate Switch to the “normal”
position. (The red LED flashes.)
13. Activate the reed switch. The red LED
flashes for three seconds while the switch
is activated.
14. 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.
15. Remove the calibration gas and replace
the DCU enclosure cover.
16. 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 current calibration.