Hitachi 902 - Sensor Logic

8 - 7
8.5 Sensor Logic
Unit Name Function Sensor Condition upon Detection Output Signal
Inversion
on DI
Board
Sample arm
up/down
Detection of liquid
level
Upper dead point
Abnormal descent
Resistor type
PC SHARP
PC OMRON
ON when liquid level is
detected
Dark when at upper dead
point
Dark upon collision
H
H
H
Inverted
Inverted
Inverted
Sample arm
rotation
HP, cell position PC HAMA
PHOTO
Dark when at HP L 
Reaction disk
rotation
HP
Cell count
ADC start
PC HAMA
PHOTO
PC HAMA
PHOTO
PC HAMA
PHOTO
Dark when at HP
Counting of dark → bright
ADC start when dark →
bright
L
H when counted
H when started


Inverted
Sample disk
rotation
HP
Stop position on
outer/
inner track
Stop position on
intermediate track
PC SHARP
PC SHARP
PC SHARP
Dark when at HP
Bright when at stop position
Bright when at stop position
H
L
L
Inverted


Reagent disk
rotation
HP
Stop position count
PC SHARP
PC SHARP
Dark when at HP
Counting of dark → bright
H
L when counted
Inverted

Syringe Upper dead point PC HAMA
PHOTO
Dark when at upper dead
point
L 
Stirrer
up/down
Upper dead point PC SHARP Dark when at upper dead
point
H Inverted
Stirrer arm
rotation
HP
Stop position count
PC SHARP
PC SHARP
Dark when at HP
Counting of dark → bright
L
L when counted


Rinse
up/down
Upper dead point PC SHARP Dark when at upper dead
point
H Inverted
ISE sipper
arm
Lower dead point PC SHARP Dark when at lower dead
point
H Inverted
Fuse Detection of blowout ON → OFF ON when blown out L 
+5 V Detection of
abnormality in voltage
Comparator L upon voltage drop L ×
+12 V Detection of
abnormality in voltage
Comparator L upon voltage drop L ×
-15 V Detection of
abnormality in voltage
Comparator H upon voltage drop L ×
+15 V Detection of
abnormality in voltage
Comparator L upon voltage drop L ×
+24 V Detection of
abnormality in voltage
Comparator L upon voltage drop L ×
Float SW Upper limit
Lower limit
Lead SW
Lead SW
OFF when full
ON when lowered
H
L
Inverted
Inverted
Vacuum Vacuum degree ON - OFF ON when deteriorated L 
Water level in
vacuum
chamber
Presence/absence of
water
ON - OFF ON when present L 