326 - Tanker loading computer

326 - Tanker loading computer
with analog valve control for smooth ramp-up / ramp down

The 326 tanker loading computer is a preset system especially designed for the automation of loading applications in hazardous areas. It is a "stand-alone" preset system with full communication options to link with high-end computer systems. The analog actuator control output is used to precisely regulate valve closure during an eight stage ramp-down cycle. With the mechanic SPST relays, pumps and non-drip valves can be controlled or two-stage process control of the valve. The process is continuously monitored with functions including: earth connection, overfill alarm and flow rate monitoring. Deviations are immediately corrected or alarmed. Design flexibility permits custom-made solutions for many applications

Features
• Displays: quantity loaded, preset value, flow rate, product name.
• Smooth ramp-up and multi-stage ramp-down control.
• Extensive monitoring functions ensures maximum safety.
• Compact, explosion-proof enclosure; ATEX certified.
• Rugged keyboard with 18 metal keys.
• Very large and clear 80 character alphanumeric display.
• Inputs for: pulse and namur sensors.
• Fail safe inputs to control the process remotely.
• Process control: two-stage or with (0)4 – 20mA output.
• Batch, time and alarm relays available.
• Very high accuracy thanks to a self learning process control.
• Operational temperature: -20°C to +60°C (-4°F to +140°F).
• User-friendly operation with clear menu structure.
• Four styles of housing are available. Wall-mount housing comes as standard.

Applications
Truck and train loading applications of general products.

Flowmeter Inputs
• Reed-switch.
• NAMUR.
• NPN/PNP pulse.

Status Inputs
• Remote control: start / pause / stop / alarm.
• Remote monitoring: earth connection, overfill, loading arm position, permissive and free status input.

Pulse Outputs
• None.

Alarm Outputs
• Function: Fail-safe permissive / alarm output - switched-off in case of an alarm.
• Type: One isolated electro-mechanical make-and-break relay or one passive DC solid-state relay.

Analog Outputs
• Function: Valve control for smooth ramp-up and eight step ramp down procedure.
• Type: One passive isolated 4 – 20mA output.

Control Outputs
• Function: Control outputs for one- or two-stage batching with active overrun correction.
• Type: Two isolated electro-mechanical make-and-break relays or two passive DC solid-state relays.

Power Supply
• 24V AC/DC.
• 115 / 230V AC.

Sensor Supply
• 8.2 – 12 – 24V DC.

Explosion Proof
• ATEX: II 2 G EEx d IIB T5.

Communication
Function: All process data and settings can be read / modified through the communication link as well as a batch can be started / stopped.
Additionally, the keyboard and display can be fully controlled as an input terminal (e.g. for driver I.D. and order entry.
Protocol: Modbus ASCII / RTU.
Interface: RS485 2-wire.