505-BC02 Analogue Input Dual Stage Batch Controller by Contrec

The Contrec 505 BC02 application is a dual-stage batch controller for reliable measurement of preset quantities using a volumetric analog input. It can be used as a single or dual-stage controller it is suitable for fast batch applications.

It provides the operator with a 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:

• RS-232 port
• RS-485 port

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 memory with at least 30 years of 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.

volume flow = (Vf max – Vf min)A + Vf min

volume = ∫( volume flow × 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. 

505 BC02 Specifications

505 BC02 Drawings for product dimensions