Owner's manual

27 AUG 08 PRELIMINARY MANUAL 37 of 57
Rev 1_3 Commander LI90 Series
• Relays #3 and #4 will ask for a Differential ON and Differential OFF level.
These settings must be in the same units used for the Empty and Full settings.
Differential ON Differential OFF
• This allows the end use to select a differential level between the two
analog inputs
• Channel #1 must be the upstream level and Channel #2 the
downstream level
• Typically, Relay #3 is used for the main differential control and Relay
#4 is for an alarm differential
• Use the Next soft key to advance to the next setting
• Use the Back soft key to return to the previous setting
• When done, press Exit to leave the Secured Function Section