Construction And Measuring Principle - Burkert 8025 Notice D'utilisation

BATCH CONTROLLER 8025
2 DESCRIPTION

2.3 Construction and measuring principle

Construction
The compact version of the Batch Controller consists of a transducer and electronic
circuitry with display facilities in a polycarbonate IP 65 module. The flow rate transducer
consists of a paddle-wheel positioned between ceramic bearings. The measurement
signal data are fed from the connecting terminals of the electronic card via 2 cable
glands.
The panel version of Batch Controller consists of an electronic card mounted on a front
panel. The associated flow rate transducer is an 8020 or 8030 either with sinus or pulse
output, or an 8031 sensor with a pulse output. The output signals appear on the
connecting terminals of the electronic card.
The wall-mounted version of Batch Controller consists of an electronic card mounted in an
ABS IP 65 enclosure. The associated flow rate transducer is an 8020 or 8030 either with
sinus or pulse output, or an 8031 sensor with a pulse output. The output signals appear
on the connecting terminals of the electronic card via 5 cable glands.
Measuring principle
The unit is positioned in a pipe in series with the valve; the unit controls the opening of the
valve and measures the quantity of the fluid which flows; it also closes the valve when the
pre-programmed quantity has been delivered.
The electronics circuit needs a voltage supply of 12-30 V DC or 115/230 VAC (compact
and wall-mounted versions). Two output relays are used to activate the valves and to
initiate alarms. The following dosing and filling operations are possible:
- Local Dosing: the user enters the quantity to be metered and initiates the dosage from
the keypad.
- Local Dosing with pre-set quantities. The user selects a quantity which has been pre-set
and initiates the dosage from the keypad.
- Remote Control Dosing using a rotary knob (selecting a pre-set quantity) or binary data
inputs.
- Dosing controlled by a PLC unit using binary data inputs.
- Automatic Dosing controlled by variation of pulse duration. The quantity of the dose is
directly proportional to the duration of a pulse.
To ensure maximum dosage and filling accuracy, the fluid velocity must be higher than
0.3 m/s for a preselection counter fitted with a Burkert flow rate sensor with pulse output
and higher than 0.5 m/s for a Burkert flow rate sensor with sinus output.
If other flow sensor type are used, refer to the specific sensor measuring range.
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