Version 091708
signals received from the ultrasonic transducer, and/or a TS-3
temperature sensor, or an operator entered value representing the air
temperature of the transmission medium.
Include a calibration method and/or enable manual operator value entry,
to set a fixed acoustic wave propagation velocity for transmission
mediums other than air.
Process Control I/O
The level controller shall provide:
Two analog signal outputs, directly or inversely proportional and scalable
to the configured process variable.
Six relay contact outputs based on the level conversion or other process
variable as set by the user configurable relay parameters.
Two discrete inputs that may be configured to override normal Process
Control Functions.
One analog signal input that may be scaled to a monitored process
variable, to be used as a basis for level controller Process Control
Functions.
Process Control Functions
The level controller shall provide an assortment of process control functions that
may be user implemented in any allowable combination.
Standard Process Control Functions
0/4–20 mA output directly / inversely proportional and scalable to:
- level, space, or distance
- volume (geometric, piecewise linear, or cubic spline approximation
derived)
- head or flow (exponential, defined flume or weir, or approximation
derived)
- volume rate (derived from change in volume per time interval)
- dual point average or dual point differential level (two transducers
required).
0/4-20 mA input configurable to represent level measured by alternate
device
Pre-configured application selections for:
- duplex wetwell or reservoir pump control by level or rate of change
- screen rake control
- general alarms
Alarms based on on/off setpoints:
- High, Low, High High, or Low Low level
- Level in bounds, out of bounds, rate of change
- Temperature
Loss of Echo or Cable Fault alarm
Pump Control - fixed roster, alternating duty assist or back-up, service
ratio duty assist or back-up, or FIFO duty assist
Pump Control Modifiers – pump run-on, pump start and power
resumption delays, wall cling reduction, independent pump group
rotations, and pump cycle activated flush operation.
Pump Control Overrides based on discrete inputs such as point level
switches or pump fault sensors
Special Device Control – remote totalizer, flow sampler
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