Hitachi 902 - Page 202

8 - 8
(cont’d)
Unit Name Function Sensor Condition upon Detection Output Signal
Inversion
on DI
Board
Water level in
incubation
bath
Presence/absence of
water
ON - OFF OFF when absent H Inverted
Waste
solution level
Detection of filled
condition
ON - OFF ON when full L 
Operation
SW
ON-OFF detection ON when energized L Inverted