RT318

8-channel RTD input

Type

 

RT318

 

 

 

 

 

 

Category

RTD ( Resistance Temperature Detector ) input

 

 

Resistance temperature

Pt100

 

 

 

 

 

 

detectors

 

 

 

 

 

 

 

 

 

 

 

 

 

Measuring method

Three-wire system

 

 

 

 

Load current

1 mA

 

 

 

 

 

 

Temperature measurement

-50° to +270°C (-58° to +518°F)

 

 

 

 

range

 

 

 

 

 

 

 

 

Converted data

800 to 4000

 

 

 

 

 

Input channel

8 channels / module

 

 

 

 

Insulation

Photo-coupler insulation (not isolated between the channels)

Conversion rate

400 ms / 8 channels

 

 

 

 

Resolution

12 bits / 0.025 %

( 0.1 °C / count )

 

 

 

 

Wire resistance correction

Within 4Ω

 

 

 

 

 

range

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Overall accuracy

±0.3 % (at 25 °C)

 

 

 

 

 

Tepaerature drift

±100 ppm / °C

 

 

 

 

 

Internal current consumption

5 Vdc, 600 mA or less

 

 

 

 

Insulation resistance

10 MΩ (500 Vdc)

 

 

 

 

 

Withstand voltage

500 Vac, 1 minutes ( between internal and external circuits)

Weight

 

500 g

 

 

 

 

 

 

Internal circuit

 

 

 

 

 

 

 

 

 

 

1 mA Current source

 

 

 

 

 

 

1 mA

 

 

 

 

 

 

 

 

AMP

 

 

 

 

 

1A

 

 

 

ADC

PC

 

Buffer memory

CH1

1B

 

 

 

Internalcircuit

1C

Rref

Multiplexer

 

 

 

 

1G

Wire break

 

 

 

 

 

AG

 

PC

 

 

detection

 

 

 

 

 

8A

 

Inputfilter

 

5 Vdc

 

 

 

+15V

 

 

 

CH8

8B

 

 

DC/DC

 

 

 

8C

Rref

 

-15V

 

 

 

 

8G

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AG

 

 

0V

 

 

 

 

 

 

 

 

PC : Photo-coupler

 

 

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Toshiba RT318 manual Channel RTD input