SENECA T121 Temperature Transmitters Instruction Manual

INSTALLATION MANUAL
T121

T121 Temperature Transmitters

PRELIMINARY WARNINGS
The word WARNING preceded by the symbol indicates conditions or actions that put the user’s safety at risk. The word CAUTION preceded by the symbol indicates conditions or actions that might damage the instrument or the connected equipment.
The warranty shall become null and void in the event of improper use or tampering with the module or devices supplied by the manufacturer as necessary for its correct operation, and if the instructions contained in this manual are not followed.

| WARNING: The full content of this manual must be read before any operation. The module must only be used by qualified electricians. Specific documentation is available using the QR-CODE shown on page 1.
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| The module must be repaired and damaged parts replaced by the Manufacturer. The product is sensitive to
electrostatic discharges. Take appropriate measures during any operation.
| Electrical and electronic waste disposal (applicable in the European Union and other countries with recycling).
The symbol on the product or its packaging shows the product must be surrendered to a collection centre authorized
to recycle electrical and electronic waste.

http://www.seneca.it/products/t121

CONTACT INFORMATION

Technical support| [email protected]| Product information| [email protected]
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This document is the property of SENECA srl. Copies and reproduction are prohibited unless authorised.
The content of this document corresponds to the described products and technologies.
Stated data may be modified or supplemented for technical and/or sales purposes.

MODULE LAYOUT

Dimensions LxHxD: 17.5 x 102.5 x 111 mm; Weight: 110 g; Enclosure: PA6, black

TECHNICAL SPECIFICATIONS

CERTIFICATIONS| http://www.seneca.it/products/t121/doc/CE_declaration| http://www.seneca.it/products/t121/doc/ATEX_certification
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INSULATION|
OUTPUT / POWER| Operating range 7 ÷ 30 Vdc
Current output: Loop 4 ÷ 20mAdc
Load resistance: 1kΩ @ 26Vdc, 21mA
Resolution: 2µA (> 13 bit)
Output in case of over-range: 102.5% of full scale
Output in case of fault: programmable between 3.4 and 23mA
Current output protection
ENVIRONMENTAL CONDITIONS| Temperature: -40 ÷ +85°C; Humidity: 30% ÷ 90% non-condensing;
Storage temperature: -40 ÷ +105°C; Degree of protection: IP20.
CONNECTIONS| 6 spring clamps for cable from 0.2 to 2.5mm2 (recommended stripping 8mm) 4-pin TTL serial programming connector
POTENTIOMETER INPUT| Potentiometer value: Potentiometer resistance up to 1700Ω without external resistor Excitation current: 375 µA
Input impedance: 10MΩ
Fault sensor detection: Yes, it can be deactivated
THERMOCOUPLE INPUT| Input impedance: 10MΩ
Cold joint compensation: -40 ÷ 100 ±1.5 °C, can be deactivated
Fault sensor detection: Yes, it can be deactivated
INPUT mV| Input impedance: 10MΩ
RTD / THERMOCOUPLE INPUT| Excitation current: 375 µA
Fault sensor detection: Yes, it can be deactivated
Maximum cable resistance: 25 Ω Influence of cable resistance: 0.0033 Ω/Ω
OTHER SPECIFICATIONS| Sampling period: 300ms
Response time (10 ÷ 90%): <620ms
Rejection to network frequency: >60dB at 50 and 60Hz EMI error: <0.5% (EMI= Electromagnetic Interference)

LOAD RESISTANCES / MINIMUM OPERATING VOLTAGE

INPUT MEASUREMENT RANGES

TYPE| INPUT| MEASUREMENT RANGE| MINIMUM SPAN| SOLUTION| STANDARD
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THERMOCOUPLE| J| -210 ÷ 1200°C| 50°C| 5µV| EN60584
K| -200 ÷ 1372°C| 50°C| 5µV| EN60584
R| -50 ÷ 1768°C| 100°C| 5µV| EN60584
S| -50 ÷ 1768°C| 100°C| 5µV| EN60584
T| -200 ÷ 400°C| 50°C| 5µV| EN60584
B(*)| 0 ÷ 1820°C| 100°C| 5µV| EN60584
E| -200 ÷ 1000°C| 50°C| 5µV| EN60584
N| -200 ÷ 1300°C| 50°C| 5µV| EN60584
L| -200 ÷ 800°C| 50°C| 5µV| GOST 8.585
RTD| Ni100| -60 ÷ 250°C| 20°C| 6mΩ| DIN 43760
Ni120| -80 ÷ 260°C| 20°C| 6mΩ| DIN 43760
Ni1000| -60 ÷ 120°C| 20°C| 6mΩ| DIN 43760
Pt100| -200 ÷ 650°C| 20°C| 28mΩ| EN 60751
Pt500| -200 ÷ 650°C| 20°C| 28mΩ|
Pt1000| -200 ÷ 200°C| 20°C| 28mΩ|
Cu50| -180 ÷ 200°C| 20°C| 6mΩ| GOST 6651
Cu100| -180 ÷ 200°C| 20°C| 6mΩ| GOST 6651
VOLTAGE| mV| -150 ÷ 150°C| 2.5mV| 5µV|
POTENTIOMETER| Ω| 500Ω ÷ 100kΩ| 10%| 0.0015%|
RESISTANCE| Ω| 0 ÷ 400Ω| 10mΩ| 6mΩ|
Ω| 0 ÷ 1760Ω| 50mΩ| 28mΩ|

(*) The measurement of thermocouple B between 0°C and 250°C is zero.
N.B.: EMI: Electromagnetic interference can cause an error of < 0.5% of Span

INPUT MEASUREMENT RANGES

Input Type| A: % of measurement| B: % of Span| C: Minimum
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Thermocouple J, K, T, N, E, L| 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
Resistance 0 ÷ 400| 0.05%| 0.05%| 40mΩ
Resistance 0 ÷ 1760| 0.05%| 0.05%| 200mΩ
Voltage| 0.05%| 0.05%| 15µV
Potentiometer| 0.05%| 0.05%| 0.01%

(*) The measurement of thermocouple B between 0°C and 250°C is zero.
(**) RTD: errors calculated on the resistive value of the sensor.

ELECTRICAL CONNECTIONS

CAUTION

To meet the electromagnetic immunity requirements:

• Use shielded signal cables;
• Connect the shield to a preferential instrumentation earth system;
• Separate shielded cables from other cables used for power installations (transformers, inverters, motors, etc.).

ANALOGUE INPUT:
The module allows for reading temperature inputs such as thermocouples (TC), RTD thermo-resistances with 2, 3 or 4 wire connection and retransmits the input reading on the 4 ÷ 20mA output loop.
The instrument can also be used to read voltages (mV) and resistances (Ω).

2-wire Connection
This connection can be used for short distances (< 10 m) between module and probe. Remember that this connection introduces a measurement error equal to the resistance of the connection cables (which can be eliminated via software). The module must be appropriately programmed from a PC for 2-wire connection.
3-wire Connection:
A connection to be used for medium-long distances (> 10 m) between module and probe. The instrument compensates the resistance of the connection cables. To ensure correct compensation, each conductor must have the same resistance. The module must be appropriately programmed from a PC for 3-wire connection.
4-wire Connection:
A connection to be used for medium-long distances (> 10 m) between module and probe. It offers maximum precision, in view of the fact that the instrument reads the resistance of the sensor independently from the resistance of the cables. The module must be appropriately programmed from a PC for 4-wire connection.
Potentiometer Connection:
A potentiometer with resistance between 500 and 1.7kΩ can be connected directly to the module. If the potentiometer you want to use has a resistance greater than 1.7kΩ up to a maximum of 100kΩ it will be necessary to use a resistor in parallel with the potentiometer: R =1.5 kΩ.

ANALOGUE OUTPUT:
Current loop connection 4 ÷ 20mA (regulated current).

NOTE:
To reduce the dissipation of the instrument it is useful to connect a load

250Ω

INSERTION AND EXTRACTION FROM SPRING CLAMPS WITH A PUSH-WIRE CONNECTION

SETTINGS

SOFTWARE CONFIGURATION
Configuring the module via PC is possible using the following accessories:
S117P: Opto-insulated, asynchronous USB-TTL, USB-RS232 and USB-RS485 serial converter
EASY-USB: Non-isolated USB-UARTTTL converter
The module can be powered by the programming connector.
Therefore, it is possible to configure the instrument even if disconnected from the 4 ÷ 20 mA loop.
The following parameters can be set by the software:

• Measurement scale start and end.
• RTD Connection: 2-wire, 3-wire and 4-wire.
• Measurement filter: Excluded/Included.
• Output: Normal (4 ÷ 20 mA) or Inverted (20 ÷ 4 mA).
• Input type.
• Compensation on cable resistance for 2-wire measurement.
• Setting output value in case of fault: value in mA.
• Cold junction compensation: YES/NO
• Over-Range: NO (Output limited between 0% and 100%) or YES (Output limited between -2.5% and 102.5%).
  The following table illustrates the values of the respective parameters.

TABLE OF OUTPUT / OVER-RANGE / FAULT LIMITS

ACCESS TO THE CONNECTOR FOR PROGRAMMING

1. Raise the protective plastic using the appropriate slot;
2. Move the protective plastic as per the drawing.

CONNECTION TO THE CONVERTER FOR S117P1 PROGRAMMING CONNECTION TO THE CONVERTER FOR EASY-USB PROGRAMMING

FACTORY SETTINGS

The instrument leaves the factory with the following default configuration which corresponds (unless otherwise indicated on the instrument) to:

USER CONFIGURABLE SENSOR TYPES

CUSTOMISATION OF THE INTERPOLATION CURVE

The EASY SETUP software allows for configuring the instrument to linearise even Custom sensors as long as their working range is within the indicated limits.
The curves of some additional sensors are already included in the software.
There is also a tool to correctly configure the S311A product connected to the T121.

ATEX SAFETY INSTRUCTIONS

The T121 Converter category 3 device is designed to be installed in area 2.
It complies with the following standards:
EN IEC 60079-0.2018; EN IEC 60079-7:2015+A1:2018; EN 60079-31:2014.
CAUTION
The system can be used in environments with group IIC gases and group IIIC powders, T4 temperature class, maximum surface temperature T=135°C and TAMB= -20°C / +65°C.
Comply with the conditions provided for use in potentially explosive areas: install the device in a case certified as suitable for area 2 (with IP54 minimum degree of protection in ATEX gas areas), and suitable for area 22 (with IP6X minimum degree of protection in ATEX powder areas).
Installation, operation and maintenance can be performed only by qualified personnel. Follow the installation instructions as described in the installation manual.
The K121 Converter must be installed and maintained in compliance with the system and maintenance regulations for environments classified against the risk of explosion due to the presence of gas (example: EN 60079-14, EN 60079-17 or other national regulations/standards).
It is not allowed to open or modify the device. It is not allowed to repair the device, repairs can be carried out only by the manufacturer. In case of malfunctions, contact the manufacturer. Do not subject the device to mechanical and/or thermal loads exceeding the specified limits.
CAUTION
DO NOT DISCONNECT WHILE LIVE

ELECTRICAL CONNECTIONS:
Electrical connections must be made as stated in the use and maintenance manual. Connect to the T121 Converter only devices designed to operate in:

• area 2 and suitable to the conditions in the place of use (II 3G Ex nA mark)
• area 22 and suitable to the conditions in the place of use (II 3D Ex tc mark).

The manufacturer is not responsible for damages deriving from improper and/or dangerous use.
ATEX MARK The following marking is printed on the product container:

|  II 3G Ex nA IIC T4 Gc X
II 3D Ex tc IIIC T135°C Dc X
TAMB: -20 ; +65°C
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II = group II (surface)
3 = category 3 (area 2/22)
G = explosive atmosphere with gases or vapours explosive atmosphere with dust
D = gas group IIC
IIC = group of conductive powders
IIIC = temperature class
T4 = maximum surface temperature 135°C EPL
T135° = special conditions of use
TAMB = range of ambient temperature -20 ; +65°C

MI00196-6-EN

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