Toshiba LF410/LF602 User Manual

EJL-114B 

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 4–20mAdc current signal  or 

communication signal. Thanks to the unique patented 

magnetic field distribution technology, the meter is 

highly immune for upstream flow disturbances. 

Combined with multi-functional converter LF600 

(combined type) or LF602 (separate type) equipped 

with its original noise-suppression circuit and 

arithmetic operation capability, LF410 has high 

tolerance to noise, giving stable output even for slurry 

fluid measurement. IR (Infrared) switches enable 

parameter setting of the converter without removing 

the cover. Flow direction can be set in either way, and 

its 128 x 128 dot matrix LCD display allows the LCD 

rotated to 90, 180 and 270 degrees with a software. 
The AF900 hand-held terminal (HART*

1 

communicator) can be used to communicate with the 

flowmeter from a remote place. PROFIBUS-PA*

2 

 

interface is available as option. 

*1: HART protocol (Highway Addressable Remote 

Transducer) is a communication protocol for industrial 

sensors recommended by the HCF

 

(HART

 

Communication

 

Foundation). 

*2: PROFIBUS is the communication protocol for the 

factory automation and process automation that 

PROFIBUS Organization recommends. Instead of 

analog control with a conventional analog signal 

(4-20mA), it is one kind of the fieldbus which digitized 

all signals. Flowmeters support PROFIBUS-PA. 

 

Power  

supply 

Converter 

I/O 

Detector 

Converter 

Power 

supply

Signal cable 

Detector 

Terminal box 

I/O 

 

  

 

 

            

         

 

 

 Overall Specifications 

0

 

–

 

0.3

 

m/s to 0

 

–10

 

m/s (0

 

–1.0

 

ft/s to 0

 

–

 

32.8

 

ft/s). 

0

 

–

 

0.1

 

m/s to 0

 

–

 

0.3

 

m/s (0

 

–

 

0.3

 

ft/s to 0

 

–

 

1.0

 

ft/s) 

range is available optionally. 

Accuracy: See the following graph. 

Pulse output: 

Vs > 0.5 m/s (1.64 ft/s): +/-0.5 % of rate. 
Vs < 0.5 m/s (1.64 ft/s): +/-0.3% of rate  
+/- 1 mm/s (0.039 inch/s). 

Current output: plus +/-8 uA (0.05 % of 

span)

 

Note: Span = Range in the magmeters. 

 

0.0

1.0

2.0

3.0

4.0

5.0

0

1

2

3

Flow Velosity (m/s)

Error

(% of rate)

Absolute figure

 

Note: The accuracy above is measured under standard 

operating conditions using the weighing method 

at Toshiba's flow calibration facility. 

*3: CE mark is under application. 

 

0                                         1                                         2                                       10

*3

Certification number

Z01207