Ascon Tecnologic - K48 Line - ENGINEERING MANUAL -Vr. 09 -
PAG. 2
2.2 Inputs
2.2.1 Termocouple Input
2
1
+
-
External resistance:
100
Ω
max., maximum error 0.5% of span.
Cold junction:
automatic compensation between 0... 50°C.
Cold junction accuracy:
0.1°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 Infrared Sensor Input
Exergen
2
1
+
-
External resistance:
Not relevant.
Cold junction:
Automatic compensation between 0... 50°C.
Cold junction accuracy:
0.1°C/°C.
Input impedance:
> 1 M
Ω
.
2.2.3 RTD (Pt 100) Input
3
RTD
1
2
Input circuit:
Current injection (135 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.
2.2.4 Thermistors Input
3
PTC/NTC
1
Input circuit:
Current injection (25 µA).
Line resistance:
Not compensated.
2.2.5 V and mV Input
mV
V
+
_
_
2
1
+
Input impedance:
> 1 M
Ω
Accuracy:
±0.5% of Span or ±1 dgt @ 25°C.
2.2.6 mA Input
0/4... 20 mA input wiring for passive transmitter
using the auxiliary pws
+
_
+
_
4... 20 mA
2 wires
transmitter
4
1
Input impedance:
< 51
Ω
.
Accuracy:
±0.5% of Span or ±1 dgt @ 25°C.
Protection:
NOT protected from short circuit.
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
1
2
0/4...20 mA
Active
transmitter
+
-
+
-
2.2.7 Logic Inputs
Safety notes:
•
Do not run logic input wiring together with power cables;
•
Use an external dry contact capable to switch 0.5 mA, 5 VDC;
•
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
6
5
4
Digital Inputs
2
1
