Toshiba LF470/LF612 规格说明表单

 

 

 

 

 

 

 

TIC-LF470B   

1/10",1/6”,1/4" (2.5,4,6mm )

 

The electromagnetic flowmeter uses Faraday’s Law of 

electromagnetic induction to measure the process flow. 

The device consists of two units: a detector, through 

which

 

the

 

fluid

 

to

 

be

 

measured

 

flows

 

and

 

in

 

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 

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*

1

 (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 

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*

2 

communicator) 

can be used to communicate with the flowmeter from a 

remote place. PROFIBUS-PA*

3 

  interface is available 

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

 

(HART

 

Communication

 

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. 

 
 
 
 
 
 
 
 
 
 
 

 

 

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. 

50∼100％ 

±0.8% of FS 

±0.8% of rate

0∼50％ 

±0.8% of FS 

±0.4% of FS 

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

Fluid conductivity: 50µS/cm minimum 

Fluid temperature: 

Stainless steel and other metals 

14 to 248 °F 

(−10℃∼＋120℃) 

Polyvinyl chloride 
(shock-resistant) 

14 to 140 °F 

(−10℃∼＋60℃) 

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) 

Fluid to be
measured 

Signal cable 

Excitation cable 

Power supply 

4-20mA dc output
and pulse output 

LF470 

LF612 

Certification number

 

Z01207

 

LF612 or LF232  
Converter

 

LF470 
Detector