Seneca T121 User manual

ENGLISH - 1/8
MI001963-E THE ORIGINAL IS IN ITALIAN
This document is property of SENECA Srl. Duplication and reproduction are forbidden, if not authorized.
Contents of the present documentation refers to products and technologies described in it.
This informations may be modified or integrated for technical and / or commercial requirements.
SENECA s.r.l.
Via Austria, 26 – 35127 – PADOVA – ITALY
Tel. [phone] - Fax [phone]
Manuals and configuration software are available at website: www.seneca.it/products/t121
EN
EN
INSTALLATION MANUAL
T121
Two-wire universal, isolated transmitter
for RTD sensors and thermocouples

The T121 instrument converts input signals and retransmits them into a normalized current signal for 4 - 20 mA
loop. The input signals may come from J, K, R, S, T, B, E, N thermocouples (EN 60584), RTD sensors
(thermistors) as Pt100 (EN 60751), Ni100 (DIN 43760), Pt500, Pt1000 and moreover, the instrument T121 can
acquire voltage and resistance values. TheRTD input may be with 2,3 or 4 wire connection.
GENERAL DESCRIPTION
ENGLISH - 2/8
MI001963-E
t
OUTPUT / POWER SUPPLY
voltageOperating
Current output
Load resistance
Resolution
Output in case of over-range
Output in case of fault
Current output protection
7 – 30 VC
Loop 4 – 20 mAC
1 kΩ @ 26 V , 21 mAC
(see: Load Resistance / Minimum operanting voltage Diagram)
2 μA (> 13 bit)
102.5% of full-scale (see Over-range table)
Programmable between 3.4 and 23 mA (see Fault table)
< 30mA
POTENTIOMETER INPUT
Potentiometer value
Energizing current
Input impedance
Sensor fault detection
Potentiometer resistance: up to 1700 Ω without exernal resistor.
375 μA
10 MΩ
Yes, may be disabled
THERMOCOUPLE INPUT
Input impedance
Cold junction compensation
Sensor fault detection
10 MΩ
- 40 – +85 ± 1.5 °C
Yes, may be disabled
TECHNICAL SPECIFICATIONS
lHigh accuracy.
l16 bit conversion measurement.
lInsulation 1500 VA.
lCompact size and fast connections with spring terminals.
lAll parameters can be configured with dedicated software: EASY SETUP downloadable from the website
www.seneca.it in the T121 software section.
GENERAL CHARACTERISTICS
MODULE LAYOUT
44 mm
17 mm
18.5 mm
4 mm
4 mm
6 mm
25 mm 8 mm
3.75 mm
M4 x 25
Weight
35 g.
Case
Material PA6 reinforced with glass-fibre, black color.

ENGLISH - 3/8
MI001963-E
t
400
800
1000
0
R Load (Ω)
1510
720 25 30
Minimum operating voltage U (VC)
R Load = ((U-7) / 0.023)
4
5
6
1
3
2
OUTPUT
INPUT
1500 VA
SERIAL TTL
mV INPUT
Input impedance
10 MΩ
RTD /
RESISTOR INPUT
Energizing current
Sensor fault detection
Maximum cable resistance
Influence of cable resistance
375 μA
Yes, may be disabled
25 Ω
0.0033 Ω/Ω
OTHER FEATURES
Sampling time
Response time (10 – 90%)
Network freq. rejection
Error caused by EMI
300 ms
< 620 ms
> 60 dB at 50 and 60 Hz
< 0.5% (EMI = ElectroMagnetic Interference)
STANDARDS
EN61000-6-4 Electromagnetic emission, industrial environment
EN61000-6-2 Electromagnetic immunity, industrial environment
EN61010-1 Safety
INSULATION
ENVIRONMENTAL COND.
Temperature
Humidity
Altitude
Storage temperature
Protection degree
4 8- 0 + 5°C.° –
30% – 90% not condensing.
Up to 2000 m. a.s.l.
° – - 0 + 5°C.4 10
IP20.
CONNECTIONS
2
6 spring terminals for 0.2 to 2.5 mm conductor section, suggested wire
stripping 8 mm, 1 Serial programming connector TTL with 4 pin.
LOAD RESISTANCE / MINIMUM OPERATING VOLTAGE DIAGRAM
TECHNICAL SPECIFICATIONS

Input measurement range table
Type
Input
Measurement
Range
Calibration
error
EMI
(*)
Minimum
Span
Resolution
Standard
Thermocouple
J
-210° – 1200 °C
0.1 %
< 0.5 %
50 °C
5 μV
EN 60584
K
-200° – 1372 °C
0.1 %
< 0.5 %
50 °C
5 μV
EN 60584
R
-50° – 1768 °C
0.1 %
< 0.5 %
100 °C
5 μV
EN 60584
S
-50° – 1768 °C
0.1 %
< 0.5 %
100 °C
5 μV
EN 60584
T
-200° – 400 °C
0.1 %
< 0.5 %
50 °C
5 μV
EN 60584
B(**)
0° – 1820 °C
0.1 %
< 0.5 %
100 °C
5 μV
EN 60584
E
-200° – 1000 °C
0.1 %
< 0.5 %
50 °C
5 μV
EN 60584
N
-200° – 1300 °C
0.1 %
< 0.5 %
50 °C
5 μV
EN 60584
RTD
Ni100
-60° – 250 °C
0.1 %
< 0.5 %
20 °C
6 mΩ
DIN 43760
Pt100
-200° – 650 °C
0.1 %
< 0.5 %
20 °C
6 mΩ
EN 60751
Pt500
-200° – 650 °C
0.1 %
< 0.5 %
20 °C
28 mΩ
Pt1000
-200° – 200 °C
0.1 %
< 0.5 %
20 °C
28 mΩ
Voltage
mV
-150 – 150 mV
0.1 %
< 0.5 %
2.5 mV
5 μV
Potentiometer
Ω
500 – 100 k Ω Ω
0.1 %
< 0.5 %
10 %
0.0015 %
Resistor
Ω
0 – 400 Ω
0.1 %
< 0.5 %
10 mΩ
6 mΩ
Resistor
Ω
0 – 1760 Ω
0.1 %
< 0.5 %
50 mΩ
28 mΩ
Accuracy measurement table: the greater between the value of the sum A + B and the value C
Input type
A: % of measurement
B: % of Span
C: Minimum
Thermocouple J, K, T, N, E
0.05 %
0.05 %
0.5 °C
Thermocouple B, R, S
0.05 %
0.05 %
1 °C
RTD (***)
0.05 %
0.05 %
0.1 °C
Resistor
0.05 %
0.05 %
40 mΩ
Resistor
0.05 %
0.05 %
200 mΩ
Voltage
0.05 %
0.05 %
15 μV
Potentiometer
0.05 %
0.05 %
0.01 %
(*) EMI: ElectroMagnetic Interferences.
(**) TC B: ThermoCouple B: between 0° and 250 °C the measurement is null.
(***) RTD: ThermoResistor: Errors calculated on the resistive value of sensor.
PRELIMINARY WARNINGS
Before performing any operation it is mandatory to read the full contents of this manual.
The module may only be used by qualified and skilled technicians in the field of electric installation.
www.seneca.it/products/t121.Specific documentation is available for download at website:
Only the Manufacturer is authorized to repair the module or to replace damaged parts.
The product is susceptible to electrostatic discharge, take appropriate countermeasures
during any operation.
The warranty is null and void in case of improper use or tampering of the module or devices
supplied by the Manufacturer, necessary for its correct operation, if the instructions in this
manual have not been complied with.
ENGLISH - 4/8
MI001963-E
t

ENGLISH - 5/8
MI001963-E
t
Disposal of electrical & electronic equipment (applicable throughout the EU and other
countries with separate collection programs). found on this product or on its The symbol
packaging,indicates that this product it must be handed over to an authorised collection point for the
recycling of electrical and electronic equipments.
PRELIMINARY WARNING
ELECTRICAL CONNECTIONS
In order to satisfy the electromagnetic compliance requirements: - Use shielded cables for signals.
- Connect the shield to a preferential ground for devices.
- Separate the shielded cables from other cables used for power installations.
(transformers, inverters, motors, induction ovens, etc...).
2 ANALOGIC INPUT
The module allows to read temperature inputs as TC thermocouples, RTD thermistors with 2, 3 or 4 wire
connection and retransmits the input reading value on the 4 - 20 mA output loop.
In addition T121 can be used to read voltages (mV) and resistors (Ω).
Thermocouple
Connection
2 wire RTD
Connection
3 wire RTD
Connection
4 wire RTD
Connection
Resistor
Connection
Potentiometer
Connection
Voltage (mV)
Connection
2 wire connection
This connection can be used for short distances ( < 10 m) between module and probe, you should remember that this connection
introduces an error in the measurement (which can be removed by software programming) equivalent to the resistance
contributed by the connection cables to the measurement. The module must be programmed by PC for 2-wire connection.
3 wire connection
This connection can be used for medium-long distances ( > 10 m ) between module and probe. The instrument performs
compensation for the resistance of the connection cables. For the compensation to be correct, the resistance values of each
conductor must be the same. The module must be programmed by PC for 3-wire connection.
4 wire connection
This connection can be used for medium-long distances ( > 10 m ) between module and probe. It offers maximum precision
because the instrument measures the resistance of the sensor independently from the resistance of the cables.
The module must be programmed by PC for 4-wire connection.
Potentiometer connection
A potentiometer with resistance between 500 and 1,7 kΩ may be connected directly to the module. If the potentiometer has
a resistance greater than 1,7 kΩ up to 100 kΩ maximum, it will be necessary to use a resistor in parallel with potentiometer:
R = 1.5 kΩ.
2 ANALOG OUTPUT
Current loop connection 4 – 20 mA (regulated current).
Note: in order to reduce the instrument's
dissipation, we recommend
a Load > 250 Ω is connected
–
+4
3
2
1
4
3
2
1
ϑ
4
3
2
1
ϑ
4
3
2
1
ϑ
4
3
2
1
4
3
2
1
R = 1k5 Ω
R
+
–
+4
3
2
1
5
6
+
Load
Iout
R Load
5
6
+
Iout
R Load

ENGLISH - 6/8
MI001963-E
t
2 INSERTING AND REMOVING FROM THE TERMINALS WITH PUSH-WIRE CONNECTION
ELECTRICAL CONNECTIONS
CONFIGURATIONS
2 SOFTWARE CONFIGURATION
The PC configuration of this module is possible with the following accessories:
S117P1: RS232/USB, TTL/USB, RS485/USB asynchronous and optoisolated serial converter;
EASY-USB: USB - UART TTL non insulated converter.
The module can be powered from the programming connector.
Then you can configure the T121 even if disconnected from the 4 - 20 mA loop.
You can set the following parameters:
· Start and full measurement scale.
· RTD connection: 2 wires, 3 wires and 4 wires.
· Measurement filter: disabled or enabled.
· Output: Normal (4 – 20 mA) or reversed (20 – 4 mA).
· Input type.
· Cable resistance compensation for 2 wires measurement.
· Output current value in case of failure: Value in mA.
· Cold junction compensation : YES (enabled) / NO (disabled)
·Over-Range: NO (Limited output between 0 % and 100%) or YES (limited output from -2.5 % to 102.5 %).
The following table shows the values of the parameters.
2 OUTPUT LIMITS / OVER-RANGE / FAULT TABLE
Output limits
Over-range / ± 2.5 %
Fault
20 mA
20.4 mA
3.4 mA – 23 mA configurable
4 mA
3.6 mA
< 3.4 mA
Push the
wire down Suggested
wire stripping:
8-9 mm
Insertion of
a solid cable
B Insert
the wire
A Press down with
the screwdriver
Insertion of
a flexible cable
B Pull up
the wire
A Press down with
the screwdriver
Extraction
of a cable

ENGLISH - 7/8
MI001963-E
t
2 DEFAULT CONDITION FOR THE CONFIGURATION PARAMETERS
The instrument leaves the factory with the following default configuration
(unless otherwise indicated on the instrument case):
TC wiring
Cold junction compensation
Filter
Reverse output
TC type
Measurement range start
Measurement full Scale
Output signal in case of fault
Over-Range
To terminals 3+ and 4-
YES (enabled)
NO (disabled)
NO (disabled)
K
0 °C
1000 °C
21 mA
YES (limited output between -2.5 % and 102.5 %).
FACTORY SETTINGS
2 PROGRAMMING CONNECTOR ACCESS
2 CONNECTIONS TO THE PROGRAMMING CONVERTER S117P1
2 CONNECTIONS TO THE PROGRAMMING CONVERTER EASY-USB
Programming
connector
1 Pull up the plastic
protective cover by
using the specific slot.
2 Move the plastic cover
as shown in the picture
aside.
CU-USBA-MINIB-5P
Rx Tx POWER
S117P1
CS-RJ10-AMP
T121
CS-RJ10-AMP T121
EASY-USB
t

ENGLISH - 8/8
MI001963-E
t
Technical support
[email protected]
Product Informations
[email protected]
CONTACTS
ORDER CODES
Code
Description
S117P1
RS232/USB, TTL/USB, RS485/USB asynchronous and optoisolated serial converter
EASY-USB
USB - UART TTL converter
CS-RJ10-AMP
Spare cable for S117P1 and EASY-USB converters
EASY-LP
Software configurator for loop powered devices
EASY-SETUP
Suite for all programmable SENECA devices
CUSTOMIZATION OF THE INTERPOLATION CURVE
The EASY SETUP software allows the configuration of the T121 module in order to linearise also the
sensors included in the above table (Custom) if their operating range is within the indicated limits.
The curves of some additional sensors, such as Ni1000, are already included in the software.
There is also a tool to properly configure the S311A product for T121 module connection.
TABLE OF USER CONFIGURABLE SENSOR TYPES
Sensor
Type
Operating range
Custom
mV
± 150 mV
RTD Ω< 400
0 – 400 Ω
RTD < 1760 Ω
0 – 1760 Ω
TC
± 150 mV
Potentiometer
500 – 100 kΩ Ω
Resistance Ω< 400
0 – 400 Ω
Resistance < 1760 Ω
0 – 1760 Ω