Yokogawa Electric Corporation - TC10 - ENGINEERING MANUAL - PAG. 2
2.2 INPUTS
2.2.1 Termocouple Input
1
2
+
_
External resistance:
100
Ω
max., maximum error 25
m
V.
Cold junction:
automatic compensation between 0 to 50°C.
Cold junction accuracy:
0.05°C/°C after a warm-up of
20 minutes.
Input impedance:
> 1 M
Ω
.
Calibration:
According to EN 60584-1.
Note:
For TC wiring use proper compensating cable
preferable shielded.
2.2.2 RTD Pt 100 Input
3
RTD
1
2
Input circuit:
Current injection (150 µA).
Line resistance:
Automatic compensation up to 20
Ω
/wire
with maximum error ±0.1% of the input span.
Calibration:
According to EN 60751/A2.
Note:
The resistance of the 3 wires must be the same.
2.2.3 RTD Pt 1000 Input
2
3
Pt1000
Line resistance:
Not compensated.
Pt 1000 input circuit:
Current injection (15 µA).
Pt 1000 calibration:
According to EN 60751/A2.
2.2.4 V and mV Input
mV
V
+
_
+
_
1
2
Input impedance:
> 1 M
Ω
for mV Input
500 k
Ω
for Volt Input.
2.2.5 mA Input
0/4 to 20 mA input wiring for passive transmitter
using the auxiliary pws
+
_
4 to 20 mA
Passive
transmitter
4
1
Input impedance:
< 53
Ω
.
Internal auxiliary PWS:
12 VDC (±10%), 20 mA max..
0/4 to 20 mA input wiring for passive transmitter
using an external pws
+
_
+
_
1
2
0/4 to 20 mA
Passive
transmitter
_
External
PWS
+
0/4 to 20 mA input wiring for active transmitter
0/4 to 20 mA
Active
transmitter
+
_
+
_
1
2
2.2.6 Logic Inputs
Safety notes:
–
Do not run logic input wiring together with power cables;
–
The instrument needs 150 ms to recognize a contact
status variation;
–
Logic inputs are
NOT
isolated by the measuring input.
A double or reinforced isolation between logic inputs and
power line must be assured by the external elements.
Logic input driven by dry contact
Digital
Input 1
Digital
Input 2
4
15
16
Maximum contact resistance:
100
Ω
.
Contact rating:
DI1 = 10 V, 6 mA;
DI2 = 12 V, 30 mA.
Logic inputs driven by 24 VDC
+
-
+
-
Digital
Input 1
Digital
Input 2
4
15
16
Logic status 1:
6 to 24 VDC;
Logic status 0:
0 to 3 VDC.
