Service manual

MDS E-SCAN MONITOR INFORMATION
57
7.4 Specific Functions
(Dwg. A-11585)
Note: 58% +2% noted below are industry standards but may vary depending upon the
application.
The Monitor is capable of performing the following functions:
1. Monitor the (+15), (-15) and (+5) supply voltage of each refractometer
independently.
Should either refractometer's supply voltages exceed a predetermined safe operating
voltage range with a minimum and maximum limit of ±10%:
a. An alarm will be activated, identifying the refractometer and circuit at fault.
b. This refractometer will automatically have its output forced low (and removed
from service).
c. No liquor diversion will take place.
2. Monitor the lamp voltage of each refractometer independently.
Should either refractometer's lamp voltage exceed a predetermined safe operating
voltage range with a minimum and maximum limit, steps (a), (b) and (c) will be
implemented.
3. Monitor the measurement voltage of each refractometer independently.
Should either refractometer's measurement voltage exceed a predetermined safe operating
voltage range with a minimum and maximum limit, steps (a), (b) and (c) will be
implemented.
4. Monitor the liquor temperature of each refractometer's sensing head
independently. Should either refractometer's liquor temperature exceed a
predetermined safe operating range with a minimum and maximum limit, steps (a), (b)
and (c) will be implemented.
5. Monitor the communications port.
Should either refractometer's serial communications port fail, steps (a), (b), and (c) will
be implemented.
6. Monitor the automatic prism cleaning system of each refractometer.
Measurement signal must drop a proper amount during the purge cycle or an alarm will
be activated. Also, the prism cleaning system must purge within a specified time or an
alarm will be activated. In addition, any purge relays activated during non-purging
operation will result in an alarm condition. In all these cases, steps (a), (b) and (c) will be
implemented.