8-Channel RTD Input Product Manual

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RT318

8-channel RTD input

Type RT318

Category RTD ( Resistance Temperature Detector ) input

Resistance temperature

detectors

Pt100

Measuring method Three-wire system

Load current 1 mA

Temperature measurement

range

-50

to +270

C (-58

to +518

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

range

Within 4

Ω

Overall accuracy ±

0.3

(at 25

Tepaerature drift ±

100 ppm /

Internal current consumption 5 Vdc, 600 mA or less

Insulation resistance

10 M

Ω

(500 Vdc)

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

Weight 500 g

Internal circuit

Buffer

memor

5 Vdc

+15V

-15V

AMP

Input filter

PC : Photo-coupler

CH1

CH8

Multiplexer

DC/DC

Rref

ADC

Current source

1 mA

Wire break

detection

Summary of content (4 pages)

PAGE 1
RT318 8-channel RTD input Type Category Resistance temperature detectors Measuring method Load current Temperature measurement range Converted data RT318 RTD ( Resistance Temperature Detector ) input Input channel Insulation Conversion rate Resolution 8 channels / module Photo-coupler insulation (not isolated between the channels) 400 ms / 8 channels 12 bits / 0.025 % ( 0.
PAGE 2
RT318 Terminal connections Terminal No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 Terminal name (NC) (NC) (NC) (NC) (NC) (NC) 1A 1B 1C 1G 2A 2B 2C 2G 3A 3B 3C 3G 4A 4B 4C 4G 5A 5B 5C 5G 6A 6B 6C 6G 7A 7B 7C 7G 8A 8B 8C 8G Function No Connection ( do not connect any wire ) RTD input channel 1 RTD input channel 2 RTD input channel 3 RTD input channel 4 RTD input channel 5 N.C. 2 N.C. 4 N.C.
PAGE 3
RT318 (1) Status indicator LEDs (PWR/FLT/RUN) 1) PWR PWR will be lit in normal state of analog power supply, and will not be lit in abnormal state. 2) FLT FLT will be lit if an error has occurred in the module. 3) RUN RUN will be lit in normal state of the module, and will not be lit in abnormal state.
PAGE 4
RT318 How to wire Shielded twisted cable Internal circuit side nA RTD (Pt100) nB nC nG RTD : Resistance Temperature Detector n : Channel number AG : Analog ground FG : Frame ground AG FG If measurement values are unstable due to noise influences, change the grounding for the shield in the following order for stable measurement.