It provides the operator with clear local readout and can be controlled via communications in more automated systems. Preset values can be accessed via a quick link on the front panel if authorised. Automatic overrun compensation caters for system delays such as valve closure for precise volumes.
The analog input can be scaled as well as having filtering, square law or non-linear correction and cutoff points applied to the signal.
505 BC02 Analogue Input Dual Stage Batch Controller features
- Tailored for volumetric analog input such as vortex flowmeters
- Single or Dual stage control
- Quick access to common batch quantities
- No-flow, leakage and overflow error detection
- Allows for square law and non- linear correction
- Storage of 100 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
Displayed Information
The front panel display shows the current values of the input variables and the results of the calculations. A list of the variables for this application and their type (total or rate) is shown at the end of this document.
The instrument can be supplied with a real-time clock for storage of up to 100 transactions with time and date stamps.
Communications
There are two communication ports available as follows:
The ports are available for remote data reading, printouts and for initial application loading of the instrument.
Retransmission & Control Outputs
The instrument can retransmit any main menu variable. The digital outputs can retransmit totals as pulses or operate as logic levels for control or error outputs. If the instrument has the advanced option, it outputs rates as a 4-20 mA signal.
Relay Outputs
The relay outputs 1 and 2 are used to control the flow of product for each delivery. These contacts are normally open and can be used to drive external relays, valves, pump circuits etc.
Software Configuration
The instrument can be further tailored to suit specific application needs including units of measurement, custom tags, second language or access levels. A distributor can configure these requirements before delivery. Instrument parameters including units of measurement can be programmed in the field, according to the user access levels assigned to parameters by the distributor.
All set-up parameters, totals and logged data are stored in non-volatile memorty with at least 30 years retention.
Calculations for the 505 BC02 Batch Controller
To derive the flow rate, the analog input is normalised to a value (A) between 0 and 1.
volumeflow = (Vf max – Vf min)A + Vf min
volume = ∫( volumeflow × Dt)
Automatic overrun compensation calculates the new valve closure point to ensure correct delivery by averaging the overrun amount from the last three complete batches.
The overrun compensation value is valid for a new preset value provided the stored overrun is less than 20% of the new preset.
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