Toshiba LF494 User Manual

Specifications and Main Features

Model: LF494 / LF404
Kind: Electromagnetic Flowmeter
Method of Measurement: It determined volumetric flow rates of electrically conductive materials on the basis of the Farady's principle of electromagnetic induction.
Usage: Intended for sanitary service in food and beverage industry.
Flow Measurement Output: 4-20 mA DC output signal.
Accuracy: ±0.5% of rate of 0.3-10 m/s of velocity range.
Supporting accuracy range: from 0.1 m/s to 0.3 m/s depending on the condition.
Weight: 2-line x 16 characters LCD (optional).
Communication Protocol: HART communications system integrated as standard.
Pressure Loss: None hence no moving parts are employed.
Installation: Each end of the detector has an ISO clamp connection to facilitate easy installation and disassembly.
Environmental Ratings:
FM Approval Classes: Class I Division 2 Groups A B C and D; Class I Division 2 Group F and G.
CSA Certification: Class I Division 2 Groups A B C and D; Class I Division 2 Groups E F and G.
Material Compatibility: Wetting materials should be chosen according to work fluid.
Maintenance Features: Intelligent functions, such as self-diagnostics and alarms.

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Frequently Asked Questions

Q1: What is the LF494/LF404 flow mtaer intended for?

A1: The LF494/LF404 flowmeter senses the volume flow rates of liquid materials in motion such as metals, by means of electrical induction principle.

Q2: Can this flowmeter be used in hazardous locations?

A2: Yes, the flowmeter can be used in Class I, Division 2 areas as approved by FM and CSA.

Q3: What type of connections does the LF494/LF404 support?

A3: There are ISO clamp connections on both sides of the detector.

Q4: What is the range of accuracy LF494/LF404 flowmeter?

A4: The equipment is guaranteed to be accurate to within ±0.5% of the rate in the velocity range of between 0.3 m/s to 10m/s.

Q5: What about LCD display for LF494/LF404?

A5: There is an optional backlit LCD display which is fitted with these instruments for those people working in poorly lit conditions.

Q6: What kind of communication does the flow meter use?

A6: The LF494/LF404 flowmeter necessitates the use of HART communication by default.

Q7: What is required to be done to make sure the flow meter works correctly?

A7: Follow guidelines on how to install, wire and the working environment as specified in the user manual. Periodic maintenance check-ups are also important.

Q8: Are there any specific precautions for installation?

A8: Yes, avoid locations with explosive atmospheres, direct sunlight, and excessive vibrations. Follow all safety precautions during installation and wiring.