50-608 Kotron Model 811 RF Point Level Sensor
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11. Differential control
a. Low Level Fail-safe
Slowly turn Differential control counterclockwise
until the LED turns ON. The wide differential point
is calibrated.
b. High Level Fail-safe
Slowly turn Differential control counterclockwise
until the LED turns OFF. The wide differential point
is calibrated.
1.9.2 Time Delay
If Time Delay is needed for any reason (e.g., surface waves
causing relay chatter), the following two choices must
be made:
Delay Function
• Delay on FILL (rising level) is DIP switch 2 ON.
• Delay on EMPTY (falling level) is DIP switch 2
OFF.
Delay Duration
• 0.5 to 7 second delay – DIP switch 3 ON, 4 OFF.
• 2 to 120 second delay – DIP switch 3 OFF, 4 ON.
• Clockwise rotation increases duration.
LONG DELAY
TIME DELAY
2 to 120 sec.
SHORT DELAY
DIFFERENTIAL
0.5 to 7 sec.
DELAY DIRECTION
COARSE
FAIL-SAFE
FINE
Figure 16
