Toshiba 8-Channel RTD Input RT318 - Manual

RT318
1
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°F)
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 °C)
Tepaerature drift
±100 ppm / °C
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
In
te
rnal c
ir
c
u
it
Buf
fer
memor
y
5 Vdc
+15V
-15V
0V
AMP
Input
f
ilt
er
1A
1B
1C
1G
PC : Photo-coupler
CH1
CH8
8A
8B
8C
8G
M
u
ltip
lexer
DC/DC
AG
AG
Rref
Rref
ADC PC
Current source
1 mA
1 mA
Wire break
detection
PC