FISHER™ CVX
Technical Parameters
General
Model: Fisher CVX Valve Positioner
Type: Microprocessor-Based, Electro-Pneumatic Positioner
Technology: Non-contact, using a Hall Effect sensor for position feedback.
Communication: Analog 4-20 mA; HART® communication protocol (on HART-enabled models).
Input Signal
Standard Analog Input: 4 to 20 mA DC, two-wire connection.
Input Impedance: 8 ohms (at 20 mA, including HART communication).
Pneumatic Performance
Supply Pressure Range: 1.4 to 7.0 bar (20 to 100 psig)
Output Pressure Range: 0 to 100% of supply pressure.
Air Consumption (Static): Very low, typically less than 0.024 Nm³/hr (0.015 SCFM).
Air Flow Capacity: Up to 1.8 Nm³/hr (1.1 SCFM) for standard models; High-flow versions are available for faster actuators.
Control & Performance
Linearity: ±0.5% of span (with characterized feedback)
Hysteresis: Less than 0.3% of span.
Calibration: Fully automatic, one-touch calibration procedure.
Environmental
Ambient Temperature Range:
Standard: -25° to 80°C (-13° to 176°F)
Extended: -40° to 80°C (-40° to 176°F)
Relative Humidity: 0 to 100% condensing.
Enclosure Rating: NEMA 4X / Type 4X / IP66 (Weatherproof, Dust-tight, and Hose-proof).
Electrical
Loop Power: Powered directly from the 4-20 mA signal loop (Two-wire device).
Hazardous Area Approvals: Available as Intrinsically Safe (FM, FMC, CSA) and Flameproof (Explosion-proof).
Physical & Mounting
Mounting: Directly mounts to Fisher rotary actuators (e.g., 1052, 1066 styles) and many linear actuators. Adaptable to other valve brands using universal mounting kits.
Housing Material: Lightweight, corrosion-resistant aluminum.
Weight: Approximately 1.6 kg (3.5 lbs).
Options & Variants
CVX500: Standard model.
CVX HART: Includes HART protocol for digital configuration and diagnostics using a hand-held communicator.
Feedback Characterizations: Available in linear and various characterized (e.g., quick-opening) curves to match the valve's flow characteristic.