Toshiba LF470, LF612 User Manual

Field Intelligent Device Series

Introduction

The electromagnetic flowmeter uses Faraday’s Law of electromagnetic induction to measure the process flow. The device consists of two units: a detector, through

the fluid to be measured flows and in which

which low-level signals proportional to flow rates are obtained; and a converter, which supplies excitation current to the detector, and amplifies the signals from the detector and then processes and converts the signals into the 4–20 mA dc current signal. The LF470 is a small meter size detector designed to measure a small amount of fluids

Electromagnetic Flowmeter

containing substances such as chemicals. The wetted materials for the LF470 are corrosion resistant ceramic and platinum electrods and are applicable to almost any kind of fluids. The LF470 is a lightweight palm-sized detector.Combined with multi-functional converter LF612 (separate type) and LF232*

(separate type) equipped with its patented Noise-Sentry original noise-suppression circuit and advanced algorithms. The LF470 is highly resistant to noise and provides a stable output even for fluids containing slurries. IR (Infrared) switches enable

Specifications

 Overall Specifications

parameter setting of the converter without removing the cover. Flow direction can be set in either way, and its unique 128 x 128 dot matrix LCD display allows the LCD to be rotated electronically to be rotated to 90, 180 and 270 degrees without opening the cover The AF900 hand-held terminal (HART* can be used to communicate with the flowmeter from a remote place. PROFIBUS-PA*

interface is available

communicator)

as an option.

*1: Please refer to the document ”TIC-LF232”. *2: HART protocol (Highway Addressable Remote

Transducer) is a communication protocol for industrial sensors recommended by the HCF Foundation).

*3: PROFIBUS is the communication protocol for factory

and process automation that the PROFIBUS Organization recommends. Instead of analog control with a conventional analog signal (4-20mA), it is the fieldbus which digitizes all signals. Flowmeters support PROFIBUS-PA.

Fluid to b measured

Signal cable

Excitation cable

LF470 Detector

(HART Communication

Power supply

4-20mA dc outpu and pulse output

LF612 or LF232 Converte

Figure 1. Configuration Diagram

LF470/LF612

1/10",1/6”,1/4" (2.5,4,6mm )

LF470

Figure 2. Electromagnetic Flowmeter

LF470/LF612

Certification number

Z01207

Measurement range in terms of flow velocity:

0–1.0ft/s to 0–32.8ft/s (0–0.3 m/s to 0–10 m/s )

Accuracy: The overall accuracy combined with the

LF612 or LF232 converter is shown in the following table.

percent of range

50〜100％

0〜50％

Note: The accuracy is measured under standard operating conditions at Toshiba's calibration facility.

1.0-3.3ft/s

(0.3-1.0m/s )

0.8% of FS

Fluid conductivity: 50µS/cm minimum

Fluid temperature:

Pipe connection material Fluid temperature

Stainless steel and other metals 14 to 248 °F

Polyvinyl chloride (shock-resistant)

Ambient temperature: 14 to 140 °F (–10 to +60 °C )

Structure: IP67

Power consumption:

・When combined with the LF612 converter: approximately 12W (20VA)

・When combined with the LF232 converter: approximately 14W (25VA)

LF612

Accuracy Flow rate as a

(−10

3.3-32.8ft/s

(1.0-10m/s )

0.8% of rate

0.4% of FS

120℃)

℃〜＋

14 to 140 °F

℃〜＋60℃

)

TIC-LF470B

 Model LF470 Detectors

Fluid pressure:

15 to 150 psi, or -1.0 to 10 bar

(-0.1 to 1 MPa)

Principal materials:

Measurement tube – Alumina ceramics Electrodes – Platinum Pipe connection port:

Standard – 316 stainless steel

Option – Ti (titanium),

Polyvinyl chloride (shock-resistant)+ Ta (Tantalum) for grounding plate, Polyvinyl chloride (shock-resistant)+ Pt-Ir grounding plate, Hastelloy C (Equivalent)

Dedicated preformed cables:

･Signal cable

– 2-wire shielded chloroprene

sheathed cable Overall length: 0.28 inch (7mm) Length: 0.20 inch (5m)

･Excitation cable – 3-wiren chloroprene sheathed

cable

Overall length: 0.28 inch (7mm)

Length:

0.20 inch (5m)

Coating: phthalic acid resin coating pearl-gray

colored

Weight: approximately 2.2 lb (1.0 kg)

(for each size excluding cables)

 Model LF612 converters

Input signals

Analog signal — the voltage signal from detector,

proportional to process flow rate (for LF612 separate type converter).

Digital input DI (opt.)

Signal type: 20 to 30Vdc voltage signal Input resistance: 2.7kΩ Number of inputs: one point

DI function — One of the following functions can be

assigned to the optional DI signal.

Range switching — Selects either the higher or lower

range in the unidirectional or bidirectional 2-range setting.

Totalizer control — Starts and stops the built-in

totalizer.

Fixed-value outputs —Outputs fixed-values for

current and pulse outputs.

Zero adjustment — Executes zero adjustment

(on-stream at zero flow rate).

Output signals

Current output:

4–20mAdc (load resistance 0 to 750Ω)

Note: The current output cannot be used with the

PROFIBUS-PA communication.

Digital outputs — One point (std.) and one more

point is optionally available as follows.

Digital output DO1 (std.):

Output type: Transistor open collector Number of outputs: One point Output capacity: 30Vdc, 200mA maximum

Digital output DO2 (opt.):

Output type:

Solid-state relay output (non polarity) Number of outputs: One point Output capacity: 150Vdc, 150mA maximum

or 150Vac (peak to peak), 100mA maximum

DO1 and DO2 functions — One of the following

functions can be assigned to DO1 (std.) and/or DO2 (opt.)

• Pulse output (available only for DO1, DO2) Pulse rate: 3.6 to 36,000,000 pulses/hr (DO1)

3.6 to 360,000 pulses/hr (DO2)

(Over 3,600,000 pulses/hr, auto-setting) Pulse width: 0.5 to 500ms (but less than half of the period for 100% flow rate)

Note: The same and simultaneous pulse is not

available between DO1 and DO2.)

• Multi-range selection outputs (Note 1)

• High, High high, Low, and/or Low low alarm

outputs (Note 2)

• Empty pipe alarm output

• Digital Output Active Status (DO1 and DO2) (Note 2)

• Preset count output

• Converter failure alarm output

Note 1: Two outputs (DO1 and DO2) are needed for

4-range switching and forward/reverse 2-range switching.

Note 2:Normal Open (default set) or Normal Close is

selected for alarm outputs when programming.

When power failure occurs, unit will be fault to Normal Open.

TIC-LF470B

Communications output ：

• HART (std.) — Digital signal is superimposed on

4–20mAdc current signal as follows: Conforms to HART protocol Load resistance: 240 to 750Ω Load capacitance: 0.25µF maximum Load inductance: 4mH maximum

• PROFIBUS(opt.)

Protocol: PROFIBUS-PA Baud rate: 31.25kbps Bus voltage: 9-30VDC

Consumption electric current of bus: less than 16mA

Manufacture Ident-No.: 093B Standard Ident-No.: 9740

HEX

Slave address: 0-126 (Default address is 126) Profile: Profile Ver.3.01 for Process Control

Devices

Function blocks: AI(Flow)×1 , Totalizer×1

LCD display:

Full dot-matrix 128×128 dot LCD display (back–light provided) The data on the LCD inside the converter can rotate to 90, 180, and 270 degrees by a software, without rotating the indicator itself. (Combined type only)

Parameter settings — Parameters can be set as

follows:

• IR Switches: Three key switches are provided to set configuration parameters.

• Digital communication: The AF900 hand-held terminal or PROFIBUS is needed to set parameters.

• Zero adjustment: Zero point adjustment can be started by pressing the switch in the converter.

• Damping: 0.5 to 60 seconds (selectable in one second increments)

“Field re-verification”

Mag-Prover – Toshiba’s

Zero span calibration tool allows unit to be re-calibrated and verified using an internal software program. (For more information contact Toshiba International Corp.)

Conditions when power fails:

Parameter setting values are stored in non–volatile memory and the values will be restored when the power returns to normal condition. The outputs and display will remain as follows when power fails.

• Current output: 0mAdc

• Digital output: OFF

• LCD display: No display

• PROFIBUS: No communication

Power supply:

One of the following can be selected:

• 100 to 240Vac, 50/60Hz (std.) (allowable voltage 80 to 264Vac)

• 24Vdc (allowable voltage 18 to 36Vdc)

• 110Vdc (allowable voltage 90 to 130Vdc)

Surge protection:

Arresters are installed in the power supply and a current signal output circuit to help protect the meter from lightning and improve personnel safety.

Case: Aluminum alloy (equal to IP 67)

Coating: Acrylic resin-baked coating, pearl–gray

colored

Cable connection port:

Cable glands —

Provided as standard, OD of 11 to 13mm Material Nylon 66 G (PF) 1/2 male screws

Applicable diameter —

0.433 to 0.512 inch (11 to 13mm)

Note: When PROFIBUS option is specified, cable gland size is φ

6～8mm for signal cable, φ11～13mm for power cable

Vibration resistance:

No resonance to the following levels of vibration:

• 10 to 150Hz with acceleration of 9.8m/s

• Vibration of 30Hz with 29.4 m/s2 in 4h in each direction will not cause any defect to unit.

Note: Avoid using the flowmeter in an environment with

constant vibration.

Dimensions :

See Figure 5

MTBF:

Converter: 220,000 hours (25 years) at 77 °F (25 °C)

based on strict military specification MIL-HDBK-217F

Detector: 350,000 hours (40 years) at 77 °F (25 °C)

based on strict military specification MIL-HDBK-217F

+ 5 hidden pages