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Contrec - Model 515 – CB01 -Frequency Input Blending Controller
The 515 CB01 application is a blending controller measuring the blending flow a in main and process line using frequency flow inputs. The blending controller can operate in PRESET, ON-OFF (manual) and RELEASE mode of operation. The latest mode allows for easier tuning of the control loop. The main and process flows are used to determine the net volume flow. The operator can view the ratio of totals as well as the ratio of flowrates. The control of the process flow is via a digital control valve. The flowrate deadband and control responsiveness can be adjusted to reduce wear on valves.
CALCULATIONS
Blend Point Location.
The controller caters for blending points before and after the main flowmeter. The process flow is a ratio of the net (combined) flow (o-80% range).
Pflow
Ratio% = —————- × 100
Netflow
During the delivery the ratio setpoint is modified to cater for the flush volume:
Preset
SP ratio (mod.) = P ratio —————-
Preset – Flush
- Tailored for volumetric frequency flow input
- Pump demand contact
- Selection of various modes of operation
- Process line control via DCV (digital control valve)
- Remote PERMISSIVE input to control delivery’s state
- PRESET and FLUSH volume parameters to automatically adjust radio setpoint
- Allows for non-linear correction
- Storage of 1000 transactions with time and date stamp
- Selection of second language and user tags
- Selectable protocols on serial ports including Modbus RTU and Printer output
- Backlit display with LCD backup