Toshiba LF470/LF612 规格说明表单

 

 

3

Communications output  ： 

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

4–20mAdc current signal as follows: 
Conforms to HART protocol 
Load resistance: 240 to 750

Ω 

Load capacitance: 0.25µF maximum 
Load inductance: 4mH maximum 

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

Consumption electric current of bus: less than 16mA 

Manufacture Ident-No.: 093B

HEX 

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 

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) 

 – 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.) 

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 

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) 

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 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 

No resonance to the following levels of vibration:   

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

2 

• Vibration of 30Hz with 29.4 m/s

2 

in 4h in each 

direction will not cause any defect to unit. 

Note: Avoid using the flowmeter in an environment with 

constant vibration. 

See Figure 5 

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