Service manual

MDS E-SCAN MONITOR INFORMATION
58
7. Monitor the isolation valve position.
A partially closed or closed valve will initiate steps (a), (b) and (c).
8. Compare meter outputs.
Should a difference of 2% solids or greater exist between refractometer readings, an
alarm will be activated.
9. Monitor the supply voltages of the Monitor.
Should either supply fail, an alarm will be activated.
10. With both refractometers in service, if either or both instruments (depending on
configuration) read below 58% liquor, diversion will take place.
If the instrument readings disagree on the percent of solids by 2%, an alarm will be
activated.
11. If one refractometer fails (or is removed from service), black liquor diversion will
be controlled by the instrument remaining in service. If this remaining instrument
reaches 58% or below or an alarm is activated on remaining refractometer, diversion will
take place.
12. If the Monitor fails diversion will be controlled by the limit alarms on the
refractometers.
Both refractometers must read below 58% before diversion will take place.
13. All system alarms are shown by flashing indicators on the Monitor.
Requires OPERATOR or INST. TECH. action to clear. Each alarm condition is
automatically printed on the Monitor on-line printer at the occurrence of the error.