Toshiba TIC-LF232A Manual De Usuario

TIC-LF232A 

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 LF232 offers various outputs such as totalization 

output and multi-range selection outputs. With it 

patented Noise-Sentry original noise-suppression 

circuit and advanced algorithms. The LF232 is highly 

resistant to noise and provides a stable output even 

when measuring fluids contain slurries. The

 

LF232 can

 

be

 

used

 

with

 

a

 

separately

 

mounted

 

detector

 

such

 

as the 

LF150 or LF470. The LF232 can also be used with 

conventional models of detectors. 

The AF900 hand-held terminal (HART*

1 

communicator) can be used to communicate with the 

flowmeter from a remote place. See the 

Communications signal specification for details about 

HART protocol. 

*1:  HART protocol (Highway Addressable Remote 

Transducer) is a communication protocol for industrial 

sensors recommended by the HCF

 

(HART

 

Communication

 

Foundation). 

 

 

 

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

Fluid conductivity:  5µS/cm or more 

Ambient temperature: -4 to 140 °F (-20 to 60 °C) 

(Storage temperature: -13 to 149 °F (-25 to 65 °C)) 

Structure: IP67 and NEMA 4X Watertight 

 

 
 
 
 
 
 
 
 
 

 

 

Figure 1.  LF232 Converter 

 

Accuracy:  the accuracy is dependent on the type of 

detector combined with the LF232. See the following 
tables for accuracy when combined with specified 
detectors. 

・

LF470 (Meter size 1/10", 1/6”, 1/4" 

(

2.5 to 6 mm)) 

0～50％ 

±

0.8％FS 

±

0.4％FS 

50～100％ 

±

0.8％FS 

±

0.8％ of rate

・

LF150 (Meter size 28” to 120” (700 to 3000 mm)) 

Accuracy: ±0.5 % of Rate* 

* This pulse output error result is established under 

standard operating conditions at Toshiba’s flow 
calibration facility, Fuchu Japan. 

* Individual meter’s measurement error may vary up 

to ± 0.8 % of Rate at 3.28 ft/s (1.0 m/s) or more and 
± 0.4% of Rate ±0.157 inch/s (4mm/s) at 3.28 ft/s 
(1.0 m/s) or less. 

* Current output: plus ± 8µA (0.05% of span). 
* Refer to individual calibration data for each 

individual meter’s measurement error.