FISHER™ DFA
Specifications:
Model: DFA Digital Flow Analyzer
Manufacturer: Fisher (Emerson)
Enclosure Rating: Typically NEMA 4X (IP66/IP67 equivalent) for harsh environments.
Ambient Temperature Range: Standard: -40° to 85°C (-40° to 185°F)
Process Temperature Range: Dependent on sensor and primary element; can range from cryogenic to over 400°C (750°F).
Process Pressure Range: Dependent on sensor and flange rating; commonly up to ANSI Class 600, 900, or 1500.
Display: High-contrast, backlit LCD graphical display.
Power Supply:
Loop-Powered (for HART): 4-20 mA DC, typically 16-42 V DC.
Line-Powered (for Fieldbus/PROFIBUS): As required by the specific communication protocol.
Measurement Performance (Varies by Technology):
Differential Pressure (DP) based models (with orifice plate, etc.):
Accuracy: Typically ±0.5% to ±1.0% of rate, depending on the flow element and calibration.
Turndown: Up to 10:1 with characterized DP flow elements.
Magnetic (Mag) based models:
Accuracy: Typically ±0.2% to ±0.5% of rate.
Turndown: Can be as high as 1000:1.
Vortex based models:
Accuracy: Typically ±0.75% to ±1.0% of rate.
Turndown: Typically up to 20:1.
Inputs / Outputs:
Primary Input: Signal from the integrated flow sensor (DP, frequency, etc.).
Analog Inputs (Optional): For additional process variables like temperature and pressure for compensation.
Communication:
Standard: 4-20 mA HART (Loop-powered models).
Digital Options: Foundation Fieldbus H1, PROFIBUS PA.
Discrete Outputs (Optional): Can be used for alarms, batch control, or pulsing a totalizer.
Discrete Inputs (Optional): For external reset or control commands.
home
