F195 - Valve Position Indicator

F195 - Valve Position Indicator
VPI for hydraulic systems

The F195 has been developed for the valve position indication and monitoring in hydraulic systems. By using a bi-directional flowmeter to measure the volume displaced by the actuator, an accurate position of the system is calculated.
The display shows the position as a percentage as well as with the text "open" and "closed" for the minimum and maximum positions. As standard, the analog output mirrors the percentage displayed which can be used to transmit the valve position. The usual difficulties encountered in such applications include: very low flows, vibration, thermal expansion of the oil and high ambient temperatures. These are all well catered for in the design and operation of the F195.
A wide range of options further enhance this models capabilities, including Intrinsic Safety for hazardous area applications and full Modbus communication.

Features
• Valve position calculated through bi-directional flow measurement.
• Displays the position as 0 - 100%, the moved volume and "open / closed" texts.
• Analog output mirrors the position of the valve.
• Modbus communication link for remote monitoring.
• Re-calibration feature.
• Service counter displays the number of full strokes.
• Easy configuration with clear alphanumeric display.
• Quadrature input to detect the direction of flow.
• Green LED backlight.
• Backup of settings 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
Valve position indication and monitoring in hydraulic systems. For example as valve position indicator VPI for ballast tanks in ships.

Flowmeter Inputs
• Pulse type inputs:
Reed-switch, NAMUR, NPN/PNP pulse, Sine wave (coil), active pulse signal.

Pulse Outputs
• Function: Scaled pulse output according to the bi-directional accumulated total (e.g. a pulse every 3.25 gallons).
Max. frequency: 64Hz.
Adjustable pulse length from 8 msec. to 2 seconds. The directional switch output is switched as soon as the pulse output reflects a "negative" quantity.
• Type: Two passive NPN transistors, active PNP transistors or isolated electro-mechanical relays.

Alarm Outputs
• None.

Analog Outputs
• Function: Re-transmitting the position of the hydraulic systems - the output can be scaled to any range (e.g. from 0% to 110%).
• 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 Loop-powered.
• 8 – 24V AC/DC.
• 115 – 230V AC.

Sensor Supply
• 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.