Flow Computer

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Electronic Instruments

EL4121/Gas Service Flow Computer, EL4201/ Density Mass Converted Gas Service Flow Computer

General

This instrument accepts flow, pressure and temperature signals from a flowmeter and indicates and outputs the total flow and instantaneous flowrate by computing standard volume with correction. EL4201 can also make mass conversion in terms of density.

Features

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Parameter change can easily be made by operating the front-panel key and by inserting an IC card.

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Fully digitalized computation enjoys high accuracy and high reliability.

Major specifications
Kinds Gas service flow computer
Type EL4121 EL4201 (Density mass conversion)
Power supply for combined flowmeter 13.5, 24, 32 VDC (depends on combined flowmeter)
Display Total flow (before and after correction), instantaneous mass flow (before and after correction), temperature, pressure, etc. Total flow (before and after correction), total mass flow (after correction), instantaneous flowrate (before correction), instantaneous mass flowrate (after correction), temperature, pressure, etc.
Input signal Flowrate (pulse), temperature, pressure Flowrate (pulse), temperature, pressure
Function Scaler, frequency division setting, F/I conversion, instrumental error correction, temperature correction, pressure correction, communication Scaler, frequency division setting, F/I conversion, instrumental error correction, temperature correction, pressure correction, communication
Output signal Analog, pulse, alarm

Computation range

Temperature –50 to +350°C (Span limited)
Pressure 0 to 3 MPa (Span limited)

Computing accuracy

Total flow after
  correction
±0.2% RD or ±0.5%RD
Temperature ±0.1% of SPAN or ±0.3% of SPAN
Pressure ±0.1% of SPAN
Ambient temperature –10 to +50°C
Configuration Non-explosionproof
Power supply AC- or DC-powered

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