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EN
T120
2 WIRE - LOOP POWERED TRANSMITTER FOR PT100 AND NI100 PROBES
General Description
The T120 instrument converts a temperature signal read by a PT100 (EN 60 751)
or NI100 probe with connection by 2, 3 or 4 wires into a signal normalised in current
for 4 - 20 mA loop (2 wires technology).
The module's main features are:
High precision
16 bit resolution
Compact size
Configuration by PC with KT120 dedicated software downloadable at
www.seneca.it.
Technical Features
PT100 Input- EN 60751/A2 (ITS-90)
-200 - +650 °C
Measurement Range :
18,5 Ù - 330 Ù
Resistance Range :
Minimum span :
20 °C
Current on sensor :
750 A rated
Cable resistance :
Max 25 Ù per wire
Connection :
2, 3 or 4 wires
Resolution:
~
6 m
NI100 Input
-60 - +250 °C
Measurement Range :
Resistance Range :
69 Ù - 290 Ù
Minimum span :
20 °C
Current on sensor :
750 A rated
Cable resistance :
Max 25 Ù per wire
Connection :
2, 3 or 4 wires
Resolution :
~
6 m
Output/Power Supply
5 - 30 V
Operating Voltage :
DC
4 - 20 mA, 20 - 4 mA (2 wires technology)
Current output :
1 kÙ @ 26 V
, 21 mA (see on page 2, Load
Load resistance :
DC
Resistance vs Minimum Functioning Voltage
diagram)
Resolution :
1 A (>14 bits)
Output in case of over-
102,5% of full scale value (see Table on Page 3)
range :
Output in case of fault :
105% of full scale value (see Table on Page 3)
Current output protection :
approximately 30 mA
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Other Features
50 Hz and 60 Hz (settable)
Network freq. Rejection :
Transmission error :
Max of 0,1% (of measurement range) or 0,1 °C
Error caused by EMI (*)
< 0,5 %
Influence of cable resistance :
0,005
/
Temperature Coefficient :
< 100 ppm, Typical : 30 ppm
Sampling Time:
100 ms (without 50/60 Hz Rejection)
300 ms (with 50/60 Hz Rejection)
Response time (10..90 %) :
< 220 ms (without 50/60 Hz Rejection)
< 620 ms (with 50/60 Hz Rejection)
Protection Index :
IP20
Operating Conditions :
Temperature -40 - +85 °C
Humidity 30 - 90 % at 40°C (non-condensing)
Altitude: up to 2000 m.a.s.l
Storage Temperature:
-40 - +105 °C
Connections :
Spring terminals
Conductor Section :
2
0,2..2,5 mm
Wire stripping :
8 mm
Box:
Nylon / glass, (black colour)
Dimensions :
20.0 mm x
40.0 mm
Standards :
EN61000-6-4/2002-10 (electromagnetic emission,
industrial surroundings)
EN61000-6-2/2006-10 (electromagnetic immunity,
industrial surroundings)
Diagram: Load Resistance vs Minimum Functioning Voltage
R
( )
Load
R
=((U-5)/0.021)
Load
1200
800
400
0
5
10
15
20
25
30
Minimum Functioning Voltage (V
)
DC
(*) EMI: electromagnetic interferences.
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Factory setting
The instrument leaves the factory with the following configuration (except for other
indications on the box):
RTD wiring
3 wires
Input filter
Enable
Reversed Output
NO
RTD Type
PT100
Measurement Range Start
0 °C
Measurement Full- Scale
100 °C
Output signal in case of
Towards the top of the output range
fault
YES: a 2.5% over-range value is acceptable;
Over-Range
a 5% over-range value is considered a fault.
Custumized Setting by PC and accessories
The configuration by PC use (see the drawing below) is possible with the following
accessories:
S117P: USB to RS232/TTL
PM002411: connection cable between S117P and T120
KT120: Dedicated programming software.
The module may be programmed even if it is not supplied by the 4..20 mA loop, since the
power supply is provided through the programming connector.
Once the user has at his disposal the above listed accessories, the following parameters
may be setStart and Full scale values.
RTD Connection: 2 wires, 3 wires o 4 wires.
50 / 60 Hz Rejection (*): Disable or enable.
Measurement filter: Disable or enable (1, 2 , 5 , 10, 30, 60 seconds).
Output: Normal (4 - 20 mA) o Reversed (20 - 4 mA).
RTD Type: PT100 or NI100.
Cable Resistance Compensation for 2 wires measurement.
Output signal in case of fault: towards the bottom of the output range or towards the top of
the output range.
Over-Range (**): NO (the fault alone causes a 2.5% over-range value) or YES (a 2.5%
It is besides possible the calibration of the output scale.
(*) The input filter slows down the response time to around 620 ms and guarantees the
repeating of the disturbance signal at 50 / 60 Hz overlapping the measurement signal.
(**) See the table below for the corresponding values.
Output signal Limit
Over-range / Fault
± 2,5 %
Fault
± 5 %
20 mA
20,4 mA
21 mA
4 mA
3,6 mA
< 3,4 mA
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Frontal Side: Terminals Position and Enumeration
1. Raising the plastic
protection using
the appropriate slot.
2. Move the plastic
protective as in the
drawing.
Programming connector
Electrical Connections
Input
The module accepts input from a PT100 (EN 60 751) or NI100 temperature probe with
connection by 2, 3 or 4 wires.
The use of shield cables is recommended for the electronic connections.
2-wire connection
This is the connection to be used for short distances ( < 10 m) between module and probe,
bearing in mind that it adds an error (which may be removed by sofware programming)
equivalent to the resistance contributed by the connection cables to the measurement.
The module has to be programmed by PC for 2 wires connection.
3-wire connection
This is the connection to be used for media-long distances ( > 10 m ) between module and
probe. The instrument performs compensation for the resistance of the connection cables.
In order for compensation to be correct, it is necessary that the resistance values of each
conductors be the same because in order to perform compensation the instrument
measures the resistance of only one conductor and assumes the resistance of the others
conductors to be exactly the same.
The module has to be programmed by PC for 3 wires connection.
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4-wire connection
This connection to be used for media-long distances ( > 10 m ) between module and probe.
Provides the maximum precision because the instrument measure the resistance of the
sensor independently of the resistance of the connection cables.
The module has to be programmed by PC for 4 wires connection.
RTD 4 wires Connection
RTD 3 wires Connection
RTD 2 wires Connection
4
4
4
3
3
3
2
2
1
1
1
Output
Current Loop connection (regolated current).
The use of shield cables is recommended for the electronic connections.
I
out
5
U
-
6
R
Load
Note: in order to reduce the instrument's dissipation, we recommend guaranteeing a load
of > 250 Ù to the current output.
Pattern of connecting terminal with push-wire connection
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Size and dimensions
Smaltimento dei rifiuti elettrici ed elettronici (applicabile nell'Unione
Europea e negli altri paesi con servizio di raccolta differenziata).
Il simbolo presente sul prodotto o sulla sua confezione indica che il prodotto
non verrà trattato come rifiuto domestico. Sarà invece consegnato al centro
di raccolta autorizzato per il riciclo dei rifiuti elettrici ed elettronici.
Assicurandovi che il prodotto venga smaltito in modo adeguato, eviterete un
potenziale impatto negativo sull'ambiente e la salute umana, che potrebbe
essere causato da una gestione non conforme dello smaltimento del
prodotto. Il riciclaggio dei materiali contribuirà alla conservazione delle
This document is property of SENECA srl. Duplication and reprodution are forbidden, if not
authorized. Contents of the present documentation refers to products and technologies
SENECA s.r.l.
Via Germania, 34 - 35127 - Z.I. CAMIN - PADOVA - ITALY
R
THE INTERNATIONAL CERTIFICATION NETWORK
Tel. +39.049.8705355 - 8705359 - Fax +39.049.8706287
ISO9001-2000
e-mail: info@seneca.it - www.seneca.it
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