F124 - Ratio controller

F124 - Ratio controller
with analog control output and high / low alarms

The F124 ratio controller has been designed to ensure that two flows are kept at the same ratio even if flows are changing. The Fluidwell ratio controller will show a strong influence of maintaining a good and constant quality of products and saves money on the blending components. The F124 is a key product of the Fluidwell Process Controller family and is the alternative to replace existing pneumatic controllers in local control loops.

Features
• Calculates and controls the ratio between flow A and flow B.
Formula: ratio = additive / main
• Three control modes:
- Hand (manual valve control)
- Local Setpoint (control additive flow only)
- Ratio (control additive flow to obtain the desired ratio).
• Bumpless transistion between the control modes.
• Displays actual and desired ratio simultaneously, flow rate A and flow rate B.
• Safety mode to place the valve in a safe position
• Analog output to control the position of the valve.
• Ratio: seven 17mm (0.67") digits, displayed as percentage.
Desired ratio: five 8mm (0.31") digits.
• Flow rate A and B: seven 17mm (0.67") digits.
• Ratio monitoring: two alarm values can be set: low and high ratio alarm.
• Displays clear alarm messages.
• Green LED backlight.
• Auto backup of settings, setpoint and control mode in EEPROM memory.
• Operational temperature: -30°C to +80°C (-22°F to 178°F).
• Very compact design for panel mount, wall mount or field mount applications.
• Rugged aluminum or GRP field mount enclosure IP67 / NEMA4X.

Applications
Applications where a constant ratio between a main flow and an addititve flow is desired (e.g. applications like glueing, blending or mixing) without the need to manually control the additive flow.

Flowmeter Inputs
• Pulse type inputs:
Reed-switch, NAMUR, NPN/PNP pulse, Sine wave (coil), active pulse signal.
Different pulse signal types are allowed for input A and B.

Status Inputs
• Remote control: Safety mode which stops the control process and places the valve in a safe position.

Pulse Outputs
• None.

Alarm Outputs
• Function: Two alarm outputs for low and high ratio alarm.
• Type: Two passive NPN transistors, active PNP transistors or isolated electro-mechanical relays.

Analog Outputs
• Function: Control output to position the valve of the additive flow.
• Type: One passive isolated, floating or loop powered 4 – 20mA output or one active (0)4 – 20mA or 0 – 10V DC output.

Power Supply
• Battery.
• 4 – 20mA Output loop-powered.
• 8 – 24V AC/DC.
• 115 – 230V AC.

Sensor Supply
• 3.2, 8.2, 12, 24V DC.

Intrinsically Safe
• ATEX: II 1 GD EEx ia IIB/IIC T4 T 100 °C

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

Communication
Function: All process data and settings can be read and modified through the communication link.
Protocol: Modbus RTU.
Interface: RS232 / RS485 2-wire or 4-wire / TTL.