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Frequency Input Secure Blending Controller – DCV Control
The 515-CB02 application is a secure blending controller measuring the volume flow in a main and process line using frequency flow inputs.
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.
The instrument can be set to prompt for a valid ID-Tag before a delivery can commence. The valid ID-Tag also sets the pre-programmed target ratio % and is stored as a part of the logged transaction record.
Calculations
The total and flowrate are derived from accurately measured frequency and the number of recieved pulses:
• volume = pulses/k-factor
• volume flow = frequency/k-factor
The controller caters for blending points before and after the main flowmeter. The process flow is a ratio of the net (combined) flow (o-100% range):
• Pflow Ratio% = —————- × 100 Netflow
Features
Tailored for volumetric frequency flow input
ID Tag validation, preprogrammed ratio %
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
Displays general purpose analog inputs
Includes user programmable value into delivery log
Allows for simplified main menu
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 Typical plant diagram
Downloads
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