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1.5.5.13 Presaturator Liquid Level Transducer (LL2)
Reference Drawings 91S25907 and 91S25910
The Presaturator Liquid Level Transducer is used in maintaining the presaturator distilled
water level constant. When the water level drops below the control point, the sensor pulls
channel A2 of TIB low, informing the CPU of the condition. The CPU will then activate
solenoid SOL4, allowing distilled water into the presaturator until LL2 puts a high on channel
A2 signifying a full or filled condition.
SOL4 is activated by applying a low from the STD-CPU (monitored at TIB terminal C2) to
the optical input (-) side of SSR2 on the Solid State Relay Board (SSRB). If the presaturator
does not fill to the control point (i.e., reservoir empty) within approximately 5 minutes, the
system will shut down. The liquid level board is powered from +5 VDC.
1.5.5.14 Console Fan (CF1)
Reference Drawing 91S25907
The Console Fan is energized by applying a low from the STD-CPU (monitored at TIB
terminal C7) to the optical input (-) side of solid state relay SSR7 on the Solid State Relay
Board (SSRB). The fan is activated when the CPU senses a cabinet temperature above 30 °C
or when control is enabled (reference section 3.2.5). Fan voltage is 100/120 VAC (220/240
VAC for HV option).
