Det-Tronics EA2100CG Eagle 2000 Communication Gateway - Manual (Page 39)

Calibration After Sensor Replacement
1. Open the junction box cover and press the sensor
replacement switch.
2. The calibrate LED on the communication module
flashes at a 1 Hz rate, indicating it is ready for the
zero input. The calibrate bit in the status word is
set.
3. Replace the sensor and apply the zero input (4 ma).
4. Activate the reed switch on the communication
module. The red LED blinks at a 2 Hz rate for 3
seconds while the reed switch is closed.
5. The communication module records the uncalibrat-
ed value in position one of the calibration log and
calibrates the zero value. The calibrate LED goes
on steady.
6. Apply the span input.
7. The calibrate LED blinks at a 1 Hz rate when the
input increases.
8. Activate the reed switch on the communication
module. The red LED blinks at a 2 Hz rate for 3
seconds while the reed switch is closed.
9. The communication module records the uncalibrat-
ed value in the first register of the calibration log
and calibrates the span value.
10. The calibrate LED goes on steady.
11. Remove the span input and return the analog input
to normal.
12. Activate the reed switch on the communication
module. The red LED blinks at a 2 Hz rate for 3
seconds while the reed switch is closed.
13. The calibration is complete. The calibrate LED
turns off and the calibrate bit in the status word is
reset.
Pressing the sensor replacement switch aborts the cali-
bration and starts over. Resetting the communication
module will abort sensor replacement.
Section IX
System Maintenance
ROUTINE MAINTENANCE
To ensure reliable protection, it is important to check
and calibrate the system on a regularly scheduled
basis. The frequency of these checks is determined by
the requirements of the particular installation.
MANUAL CHECK OF OUTPUT DEVICES
Fault detection circuitry continuously monitors for prob-
lems that could prevent proper system response.
However, this circuitry does not monitor external
response equipment or the wiring to these devices. It is
important that these devices be checked initially when
the system is installed, as well as periodically during the
on-going maintenance program.
CHECKOUT IN NORMAL MODE
The system should be checked periodically in the
Normal mode to ensure that those items not checked by
diagnostic circuitry are functioning properly.
CAUTION
Be sure to secure all output devices that are actu-
ated by the system to prevent unwanted activation
of this equipment, and remember to place these
same output devices back into service when the
checkout is complete.
O-RING MAINTENANCE
A rubber O-ring is used to ensure that the junction box
cover will seal tightly and provide protection against
water ingress. Periodically open the enclosure and
ckeck the O-ring for breaks, cracks and dryness. To test
the ring, remove it from the enclosure and stretch it
slightly. If cracks are visible, it should be replaced. If it
feels dry, a thin coating of lubricant should be applied.
When re-installing the ring, be sure that it is properly
seated in the groove on the housing. It is imperative that
this O-ring be properly installed and in good condition.
Failure to properly maintain it can allow water to enter the
enclosure and cause premature failure. A coating of
lubricant should also be applied to the threads on the
cover before re-assembling the enclosure. This will both
lubricate the threads and help to prevent moisture from
entering the enclosure.
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