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Flow Counter
The controller will accept a square wave input from a flow counter
and sample after X number of pulses . X is determined by the flow
counter setpoint . The square wave must have an ON time of at least 200
microseconds for the controller to recognize the input .
The Flow Counter option is enabled using the Enable soft key . Setpoint
value is entered using the ENTER, UP and DOWN arrow keys, and ESC key, as
detailed in the Setpoint section .
This option is no longer a time based sampling cycle . The time between samples is determined by the number of
counts from the flow counter input . Extend and Retract times are based on operator setpoints .
Delay Start
The controller will accept a dry contact input from a plant device, such as
a pump . If the Delay Start function is selected, sampling will wait until the
contact is closed . Then after the time delay entered has expired, sampling
will start .
This feature is useful if you have a pump that cycles off and on . You only
want to sample when the pump is on and at full flow . Connect the dry
contact, enter the desired time delay, place the controller in AUTO and
sampling will take place only when the pump conditions are met .
The Delay Start option is enabled using the Enable soft key . Setpoint value is entered using the ENTER, UP and DOWN
arrow keys, and ESC key, as detailed in the Setpoint section .
Maintenance Functions
The Maintenance menu provides access to various information options for
your controller .
ƒ Press the SERVICE key on the controller to view the Maintenance menu .
ƒ Use the small arrow keys to navigate to the desired option, and then
press the Enter key to select the menu item .
ƒ Press the ESC key to return to the Maintenance menu .
Sentry SBC Controller
Original Instructions
13
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