Service manual

MDS E-SCAN MONITOR INFORMATION
59
7.5 Trouble Shooting Guide and Truth Table
(For unit configured for two refractometer divert.)
(X) Refrac removed from service
(Y) Refrac remaining in service now solely responsible for diversion. Diversion will occur if
reading drops below 58% due to low solids or alarm being activated which would remove unit
from service. (Alarms shown on next page.)
Condition for either
Refractometer (1) or (2)
Alarms
Activated
Liquor
Diversion
Additional
Notes
Loss of power to console, fuse open,
etc.
1,2,3,5,8 (X) (Y)
No (+)15 supply, defective component,
fuse open, etc.
1,2,5,8 (X) (Y)
No (-)15 supply, defective component,
fuse open, etc.
1,2 (X) (Y)
Loss of signal from head, lamp open,
bad detector, etc.
2,7 (X) (Y)
Process out of operating range,
defective thermistor circuit, etc.
2 (X) (Y)
Purge not cleaning prism, loss of
steam, defective solenoids, etc.)
4 (X) (Y)
Prism clean inoperative 4 (X) (Y)
Isolation valve closed or partially
closed.
5 (X) (Y)
Drift in meter output due to defective
components, improper calibration, etc.
7 If reading is below
58% solids on one
unit & no alarms
other than #7 are
activated will divert
when other refract
purges
Defective Monitor (+)15 or (-) 15
supply or loss of power.
6 If both refracs are
reading below 58%.