Ascon Tecnologic - KX Series - ENGINEERING MANUAL -Vr.4.0
PAG. 2
3. When a shielded cable is used, it should be connected at
one point only.
4. Pay attention to the line resistance; a high line resistance
may cause measurement errors.
2.3 INPuTS
2.3.1 Termocouple Input
1
2
+
_
External resistance:
100
Ω
max., maximum error 25
m
V.
Cold junction:
automatic compensation between 0... 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.
2.3.2 Infrared Sensor Input
Exergen
1
2
+
_
External resistance:
Not relevant.
Cold junction:
automatic Compensation between 0... 50°C.
Cold junction accuracy:
0.05°C/°C.
Input impedance:
> 1 M
Ω
.
2.3.3 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.
2.3.4 RTD Pt 1000, NTC and PTC Input
2
3
Pt1000
Line resistance:
Not compensated.
Pt 1000 input circuit:
Current injection (15 µA).
Pt 1000 calibration:
According to EN 60751/A2.
2.3.5 V and mV Input
mV
V
+
_
+
_
1
2
Input impedance:
> 1 M
Ω
for mV Input
500 k
Ω
for Volt Input.
2.3.6 mA Input
0/4... 20 mA input wiring for passive transmitter
using the auxiliary pws
+
_
4...20 mA
Passive
transmitter
4
1
Input impedance:
< 53
Ω
.
Internal auxiliary PwS:
12 VDC (±10%), 20 mA max..
0/4... 20 mA input wiring for passive transmitter
using an external pws
+
_
+
_
1
2
0/4...20 mA
Passive
transmitter
_
External
PWS
+
0/4... 20 mA input wiring for active transmitter
0/4...20 mA
Active
transmitter
+
_
+
_
1
2
2.3.7 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
4
5
6
Digital
input 2
Maximum contact resistance:
100
Ω
.
Contact rating:
DI1 = 10 V, 6 mA;
DI2 = 12 V, 30 mA.