SITRANS TF420 (HART, UNIVERSAL) Overview

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SITRANS TF420 (HART, UNIVERSAL) Overview

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SITRANS TF420 (HART, universal)
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SITRANS TF420 (HART, Universal) là một bộ truyền tín hiệu nhiệt độ của Siemens, được thiết kế để đo và chuyển đổi tín hiệu nhiệt độ từ các cảm biến nhiệt độ thành tín hiệu dòng điện 4-20 mA. Bộ chuyển đổi này hỗ trợ giao thức HART, cho phép truyền thông hai chiều giữa cảm biến và hệ thống điều khiển, giám sát.

Dưới đây là một số điểm nổi bật về SITRANS TF420 (HART, Universal) của Siemens:

Chuyển đổi nhiệt độ đáng tin cậy: SITRANS TF420 sử dụng các cảm biến nhiệt độ cao cấp để đo nhiệt độ đáng tin cậy và chính xác trong các môi trường công nghiệp khắc nghiệt.
HART Communication: Bộ chuyển đổi SITRANS TF420 hỗ trợ giao thức HART, cho phép gửi và nhận dữ liệu nhiệt độ thông qua một giao thức truyền thông thông minh. Giao thức HART cung cấp truyền thông hai chiều giữa cảm biến và hệ thống điều khiển, giúp giám sát trạng thái của cảm biến và thực hiện cấu hình từ xa.
Universal Input: SITRANS TF420 được thiết kế với đầu vào "Universal", có thể hoạt động với nhiều loại cảm biến nhiệt độ khác nhau, bao gồm cả RTD và thermocouple, giúp đơn giản hóa quá trình cài đặt và tích hợp vào hệ thống điều khiển và giám sát.
Tùy chọn đầu ra tín hiệu: Bộ chuyển đổi SITRANS TF420 có tùy chọn đầu ra tín hiệu dòng điện 4-20 mA, là một tín hiệu phổ biến trong hệ thống điều khiển và giám sát quy trình công nghiệp.
Thiết kế bền bỉ: SITRANS TF420 được thiết kế để hoạt động ổn định và đáng tin cậy trong môi trường công nghiệp khắc nghiệt, với khả năng chống rung động, chịu nhiệt độ cao và chịu va đập.
Hiển thị đơn giản: Bộ truyền tín hiệu SITRANS TF420 có màn hình hiển thị đơn giản và dễ sử dụng, cho phép người dùng dễ dàng đọc và xác nhận giá trị nhiệt độ đo được.
Cấu hình linh hoạt: Bộ chuyển đổi SITRANS TF420 có khả năng cấu hình linh hoạt, cho phép người dùng tuỳ chỉnh các thiết lập và hiệu chuẩn dễ dàng.
Ứng dụng đa dạng: SITRANS TF420 có thể được sử dụng trong nhiều ngành công nghiệp và ứng dụng, bao gồm hóa chất, dầu khí, thực phẩm và đồ uống, và các quy trình đo lường nhiệt độ khác.

Tóm lại, SITRANS TF420 (HART, Universal) của Siemens là một bộ chuyển đổi nhiệt độ chất lượng cao, được thiết kế để đáp ứng các yêu cầu đa dạng của khách hàng và đảm bảo hoạt động ổn định và tin cậy trong suốt quá trình vận hành. Chúng là lựa chọn phổ biến trong nhiều ứng dụng công nghiệp và đo lường.

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Overview

SITRANS TF420 in dual chamber enclosure

SITRANS TF420 in single chamber enclosure

2‑wire temperature transmitter with HART communication interface
Universal input for virtually any type of temperature sensor
Connection of two independent input circuits for redundant operation (high input availability)
Input drift detection
Can be configured via PC, HART 7 or optional local operation

Benefits

Universally applicable as a temperature transmitter with galvanic isolation for:
- Resistance thermometer (2-wire, 3-wire, 4-wire connection)
- Thermocouples
- Linear resistances, potentiometer and DC voltage sources
Local operation of the temperature transmitter via display (single chamber enclosure) or control keys accessible from outside (dual chamber enclosure)
Rugged single or dual chamber enclosure made of die-cast aluminum or stainless steel 316/316L
Electronic compartment isolated (watertight) from terminal compartment in dual chamber enclosure
Degree of protection IP66/68 (1.5 m/2 h)
Electromagnetic compatibility according to EN 61326 and NE21
Test terminals for direct read-out of the output signal without breaking the current loop
Remote installation option:
- Measuring point is difficult to access
- Measuring point is subjected to high temperatures
- Measuring point is subjected to vibration through plant
- Long neck pipes and thermowells must be avoided
Temperature transmitters of the "intrinsically safe protection type, increased safety for zone 2, flameproof and dust-protected" type of protection can be installed in hazardous areas. The transmitter meets the requirements of the EU Directive 2014/34/EU (ATEX), the FM and CSA regulations as well as other national approvals, e.g. EACEx, NEPSI, KCs, Inmetro.
SIL2/3 (with order note C20) according to IEC 61508 and Electrical Equipment For Furnaces And Ancillary Equipment (EN 50156-2)

Application

SITRANS TF420 with its two sensor inputs can be used everywhere where temperatures need to be measured without interruption under particularly adverse conditions and where a convenient local display is ideal. Which is why users from all industries have opted for this field device. The rugged enclosure protects the electronics. The stainless steel model is almost completely resistant to sea water and other aggressive substances. The inner workings offer high measuring accuracy, universal input and a wide range of diagnostic options.

Function

Configuration

The communication capability over the HART protocol V 7 permits parameterization using a PC or HART communicator (hand-held communicator). The SIMATIC PDM makes it easy.

The optional local operation on the device gives you the possibility to configure the device's most important functions very quickly.

Principle of operation

SITRANS TF420 as temperature transmitter

Two sensor signals, whether resistance thermometers (RTD), thermocouples (TC), Ω or mV signals, are amplified and linearized. Input and output side are galvanically isolated. An internal cold junction is integrated for measurements with thermocouples.

The device outputs a temperature-linear direct current from 4 to 20 mA. As well as the analog transmission of measured values from 4 to 20 mA, the HART version also supports digital communication for online diagnostics, measured value transmission, and configuration.

SITRANS TF420 automatically detects when a sensor should be interrupted or is indicating a short-circuit. If the back-up functionality has been selected in the primary value display, the SITRANS TF420 automatically switches to the 2nd input without interrupting the measured value; e.g. primary value input 1 with input 2 as backup. The practical test terminals allow direct measurement of 4 to 20 mA signals over an ammeter without interrupting the output current loop.

Function block diagram SITRANS TF420 with integrated SITRANS TH420

Technical specifications

SITRANS TF420 (HART, universal)
General
Supply voltage^{1) 2)}
Without explosion protection (non-Ex)	10.5 ... 48 V DC
With explosion protection (Ex i)	10.5 ... 30 V DC
Additional minimum supply voltage when using test terminals	0.8 V
Maximum power loss	≤ 850 mW
Minimum load resistance at supply voltage > 37 V	(V_supply - 37 V)/23 mA
Insulation voltage, test/operation
Without explosion protection (non-Ex)	2.5 kV AC/55 V AC
With explosion protection (Ex i)	2.5 kV AC/42 V AC
Polarity protection	All inputs and outputs
Write protection	Wire jumper (transmitter), switch (on display) or software
Warm-up time	< 5 min
Starting time	< 2.75 s
Programming	HART
Signal-to-noise ratio	> 60 dB
Long-term stability	Better than: ± 0.05% of measuring span/year ± 0.18% of measuring span/5 years
Response time	4 ... 20 mA: ≤ 55 ms HART: ≤ 75 ms (typically 70 ms)
Programmable damping	0 ... 60 s
Signal dynamic
Input	24 bit
Output	18 bit
Influence of change in supply voltage	< 0.005% of measuring span/V DC
Input
Resistance thermometer (RTD)
Input type
Pt10 ... 10000	IEC 60751 JIS C 1604‑8 GOST 6651_2009 Callendar-Van Dusen
Ni10 ... 10000	DIN 43760-1987 GOST 6651-2009/OIML R84:2003
Cu5 ... 1000	Edison Copper Winding No. 15 GOST 6651‑2009/OIML R84:2003
Connection type	2-wire, 3-wire or 4-wire
Wire resistance per wire	Max. 50 Ω
Input current	< 0.15 mA
Effect of the wire resistance (with 3-wire and 4-wire connections)	< 0.002 Ω/Ω
Cable, wire-wire capacity
Pt1000, Pt10000 (IEC 60751 and JIS C 1604‑8)	Max. 30 nF
All other input types	Max. 50 nF
Fault detection, programmable	None, short-circuited, defective, short-circuited or defective Note When the low limit for the configured input type is below the constant detection limit for short-circuited inputs, the detection of short circuits is disabled regardless of the configuration of the fault detection.
Detection limit for short-circuited input	15 Ω
Fault detection time (RTD)	≤ 75 ms (typically 70 ms)
Fault detection time (for 3-wire and 4-wire)	≤ 2 000 ms
Thermocouples (TC)
Input type
B	IEC 60584‑1
E	IEC 60584‑1
J	IEC 60584‑1
K	IEC 60584‑1
L	DIN 43710
Lr	GOST 3044‑84
N	IEC 60584‑1
R	IEC 60584‑1
S	IEC 60584‑1
T	IEC 60584‑1
U	DIN 43710
W3	ASTM E988‑96
W5	ASTM E988‑96
LR	GOST 3044‑84
Cold Junction Compensation (CJC)	Constant, internal or external over Pt100 or Ni100 RTD
Temperature range internal CJC	-50 ... +100 °C (-58 ... +212 °F)
Connection external CJC	2-wire or 3-wire
External CJC, wire resistance per wire (for 3-wire and 4-wire connections)	50 Ω
Effect of the wire resistance (with 3-wire and 4-wire connections)	< 0.002 Ω/Ω
Input current external CJC	< 0.15 mA
Temperature range external CJC	‑50 ... +135 °C (‑58 ... +275 °F)
Cable, wire-wire capacity	Max. 50 nF
Total wire resistance	Max. 10 kΩ
Fault detection, programmable	None, short-circuited, defective, short-circuited or defective Note The short-circuited fault detection only applies to the CJC input.
Fault detection time (TC)	≤ 75 ms (typically 70 ms)
Fault detection time, external CJC (for 3-wire and 4-wire)	≤ 2 000 ms
Linear resistance
Input range	10 Ω ... 100 kΩ
Minimum measuring span	25 Ω
Connection type	2-wire, 3-wire or 4-wire
Wire resistance per wire	Max. 50 Ω
Input current	< 0.15 mA
Effect of the wire resistance (with 3-wire and 4-wire connections)	< 0.002 Ω/Ω
Cable, wire-wire capacity
R > 400 Ω	Max. 30 nF
R ≤ 400 Ω	Max. 50 nF
Fault detection, programmable	None, defective
Potentiometers
Input range	0 ... 100 kΩ
Minimum measuring span	25 Ω
Connection type	2-wire, 3-wire or 4-wire
Wire resistance per wire	Max. 50 Ω
Input current	< 0.15 mA
Effect of the wire resistance (with 4-wire and 5-wire connections)	< 0.002 Ω/Ω
Cable, wire-wire capacity
R > 400 Ω	Max. 30 nF
R ≤ 400 Ω	Max. 50 nF
Fault detection, programmable	None, short-circuited, defective, short-circuited or defective Note When the configured potentiometer size is below the constant detection limit for short-circuited inputs, the detection of short circuits is disabled regardless of the configuration of the fault detection.
Detection limit for short-circuited input	15 Ω
Fault detection time, wiper arm (no short-circuit detection)	≤ 75 ms (typically 70 ms)
Fault detection time, element	≤ 2 000 ms
Fault detection time (for 4-wire and 5-wire)	≤ 2 000 ms
Supply voltage
Measuring range
Unipolar	‑100 ... 1700 mV
Bipolar	‑800 ... +800 mV
Minimum measuring span	2.5 mV
Input resistance	10 MΩ
Cable, wire-wire capacity
Input range: ‑100 ... 1700 mV	Max. 30 nF
Input range: ‑20 ... 100 mV	Max. 50 nF
Fault detection, programmable	None, defective
Fault detection time	≤ 75 ms (typically 70 ms)
Output and HART communication
Normal range, programmable	3.8 ... 20.5 mA/20.5 ... 3.8 mA
Extended range (output limits), programmable	3.5 ... 23 mA/23 ... 3.5 mA
Programmable input/output limits
Fault current	Enable/disable
Fault current setting	3.5 ... 23 mA
Update time	10 ms
Load (with current output)	≤ (V_Supply - 10.5)/0.023 Ω
Load stability	< 0.01% of measuring span/100 Ω (measuring span = currently selected range)
Input fault detection, programmable (detection of input short-circuits is ignored with TC and voltage inputs)	3.5 ... 23 mA
NAMUR NE43 Upscale	> 21 mA
NAMUR NE43 Downscale	< 3.6 mA
HART protocol versions	HART 7
Measuring accuracy
Input accuracy	See "Input accuracy" table
Output accuracy	See "Output accuracy" table
Operating conditions
Ambient temperature
Without local operation in single chamber enclosure	‑50 ... +85 °C (‑58 ... +185 °F)
With local operation	‑40 ... +85 °C (‑40 ... +185 °F)
For transmitters with functional safety	‑40 ... +80 °C (‑40 ... +176 °F)
Storage temperature	‑50 ... +85 °C (‑58 ... +185 °F)
Reference temperature for sensor calibration	24 °C ±1.0 °C (75.2 °F ±1.8 °F)
Relative humidity	< 99% (no condensation)
Degree of protection
Temperature transmitter enclosure	IP66/IP68
Terminals	IP00
Structural design
Weight
Single chamber enclosure	Aluminum: 0.85 kg (1.87 lbs) Stainless steel: 1.69 kg (3.73 lbs)
Dual chamber enclosure	Aluminum: 1.3 kg (2.87 lbs) Stainless steel: 3.3 kg (7.28 lbs)
Maximum core cross-section
Single chamber enclosure	1.5 mm² (AWG 16)
Dual chamber enclosure	2.5 mm² (AWG 14)
Tightening torque for clamping screws	0.5 ... 0.6 Nm
Vibrations	IEC 60068‑2‑6
2 ... 25 Hz	± 1.6 mm (0.07 inches)
25 ... 100 Hz	± 4 g
Certificates and approvals
Explosion protection ATEX/IECEx and others
Certificates³⁾	IECEx DEK 19.0069X IECEx DEK 19.0070X DEKRA 19ATEX0106 X (Category 1) DEKRA 19ATEX0108X (Category 2) DEKRA 19ATEX0107X (Category 3) A5E50642461A‑2021X (Category 3)
"Intrinsic safety ia/ib" type of protection	For use in Zone 0, 1, 2, 21
ATEX	II 1 G Ex ia IIC T6 ... T4 Ga II 2 (1) G Ex ib [ia Ga] IIC T6 ... T4 Gb II 2 (1) D Ex ib [ia Da] IIIC T100 °C Db
IECEx and others	Ex ia IIC T6 ... T4 Ga Ex ib [ia Ga] IIC T6 ... T4 Gb Ex ib [ia Da] IIIC T 100 °C Db
"Intrinsic safety ic" type of protection	For use in Zone 2, 22
ATEX	II 3 G Ex ic IIC T6…T4 Gc II 3 D Ex ic IIIC T100 °C Dc
IECEx and others	Ex ic IIC T6 ... T4 Gc Ex ic IIIC T100 °C Dc
"Increased safety ec" type of protection	For use in Zone 2
ATEX	II 3 G Ex ec IIC T6…T4 Gc
IECEx and others	Ex ec IIC T6 ... T4 Gc
"Flameproof enclosure db" type of protection	For use in Zone 1
ATEX	II 2 G Ex db IIC T6…T4 Gb
IECEx and others	Ex db IIC T6 ... T4 Gb
"Protection by enclosure tb/tc" type of protection	For use in Zone 21, 22
ATEX	II 2 D Ex tb IIC T100 °C Db II 3 D Ex tc IIIC T100 °C Dc
IECEx and others	Ex tb IIC T100 °C Db Ex tc IIIC T100 °C Dc

¹⁾ Note that the minimum supply voltage must correspond to the value measured at the terminals of the SITRANS TF420. All external voltage drops must be taken into account.

²⁾ Protect the device from overvoltage with the help of a suitable power supply or suitable overvoltage protection equipment.

³⁾ Additional available certificates are listed on the internet at http://www.siemens.com/processinstrumentation/certificates

Measuring ranges/Minimum measuring span

RTD

Input type	Standard	Measuring range in °C (°F)	α₀ in °C^-1 (°F^-1)	Minimum measuring span in °C (°F)
Pt10 ... 10000	IEC 60751	‑200 ... +850 (‑328 ... +1 562)	0.003851 (0.002139)	10 (50)
	JIS C 1604‑8	‑200 ... +649 (‑328 ... +1 200)	0.003916 (0.002176)	10 (50)
	GOST 6651_2009	‑200 ... +850 (‑328 ... +1 562)	0.003910 (0.002172)	10 (50)
	Callendar-Van Dusen	‑200 ... +850 (‑328 ... +1 562)	-	10 (50)
Ni10 ... 10000	DIN 43760-1987	‑60 ... +250 (‑76 ... +482)	0.006180 (0.003433)	10 (50)
Ni10 ... 10000	GOST 6651-2009/OIML R84:2003	‑60 ... +180 (‑76 ... +356)	0.006170 (0.003428)	10 (50)
Cu5 ... 1000	Edison Copper Winding No. 15	‑200 ... +260 (‑328 ... +500)	0.004270 (0.002372)	100 (212)
	GOST 6651‑2009/OIML R84:2003	‑180 ... +200 (‑292 ... +392)	0.004280 (0.002378)	100 (212)
	GOST 6651‑94	‑50 ... +200 (‑58 ... +392)	0.004260 (0.002367)	100 (212)

Input type	Standard	Measuring range in °C (°F)	Minimum measuring span in °C (°F)
B	IEC 60584‑1	0 (85) ... 1 820 (32 (185) ... 3 308)	100 (212)
E	IEC 60584‑1	‑200 ... +1 000 (‑392 ... +1 832)	50 (122)
J	IEC 60584‑1	‑100 ... +1 200 (‑212 ... +2 192)	50 (122)
K	IEC 60584‑1	‑180 ... +1 372 (‑356 ... +2 502)	50 (122)
L	DIN 43710	‑200 ... +900 (‑392 ... +1 652)	50 (122)
Lr	GOST 3044‑84	‑200 ... +800 (‑392 ... +1 472)	50 (122)
N	IEC 60584‑1	‑180 ... +1 300 (‑356 ... +2 372)	50 (122)
R	IEC 60584‑1	‑50 ... +1 760 (‑122 ... +3 200)	100 (212)
S	IEC 60584‑1	‑50 ... +1 760 (‑122 ... +3 200)	100 (212)
T	IEC 60584‑1	‑200 ... +400 (‑392 ... +752)	50 (122)
U	DIN 43710	‑200 ... +600 (‑392 ... +1 112)	50 (122)
W3	ASTM E988‑96	0 ... 2 300 (32 ... 4 172)	100 (212)
W5	ASTM E988‑96	0 ... 2 300 (32 ... 4 172)	100 (212)
LR	GOST 3044‑84	‑200 ... +800 (‑392 ... +1472)	50 (122)

Input accuracy

Basic values

Input type	Basic accuracy	Temperature coefficient¹⁾
RTD
Pt10	≤ ±0.8 °C (1.44 °F)	≤ ±0.020 °C/°C (°F/°F)
Pt20	≤ ±0.4 °C (0.72 °F)	≤ ±0.010 °C/°C (°F/°F)
Pt50	≤ ±0.16 °C (0.288 °F)	≤ ±0.004 °C/°C (°F/°F)
Pt100	≤ ±0.04 °C (0.072 °F)	≤ ±0.002 °C/°C (°F/°F)
Pt200	≤ ±0.08 °C (0.144 °F)	≤ ±0.002 °C/°C (°F/°F)
Pt500	T_max. < 180 °C (356 °F) = ≤ ±0.08 °C (0.144 °F) T_max. > 180 °C (356 °F) = ≤ ±0.16 °C (0.288 °F)	≤ ±0.002 °C/°C (°F/°F)
Pt1000	≤ ±0.08 °C (0.144 °F)	≤ ±0.002 °C/°C (°F/°F)
Pt2000	T_max. < 300 °C (572 °F) = ≤ ±0.08 °C (0.144 °F) T_max. > 300 °C (572 °F) = ≤ ±0.4 °C (0.72 °F)	≤ ±0.002 °C/°C (°F/°F)
Pt10000	≤ ±0.16 °C (0.288 °F)	≤ ±0.002 °C/°C (°F/°F)
Pt x	Largest tolerance of neighboring points	Largest temperature coefficient of neighboring points
Ni10	≤ ±1.6 °C (2.88 °F)	≤ ±0.020 °C/°C (°F/°F)
Ni20	≤ ±0.8 °C (1.44 °F)	≤ ±0.010 °C/°C (°F/°F)
Ni50	≤ ±0.32 °C (0.576 °F)	≤ ±0.004 °C/°C (°F/°F)
Ni100	≤ ±0.16 °C (0.288 °F)	≤ ±0.002 °C/°C (°F/°F)
Ni120	≤ ±0.16 °C (0.288 °F)	≤ ±0.002 °C/°C (°F/°F)
Ni200	≤ ±0.16 °C (0.288 °F)	≤ ±0.002 °C/°C (°F/°F)
Ni500	≤ ±0.16 °C (0.288 °F)	≤ ±0.002 °C/°C (°F/°F)
Ni1000	≤ ±0.16 °C (0.288 °F)	≤ ±0.002 °C/°C (°F/°F)
Ni2000	≤ ±0.16 °C (0.288 °F)	≤ ±0.002 °C/°C (°F/°F)
Ni10000	≤ ±0.32 °C (0.576 °F)	≤ ±0.002 °C/°C (°F/°F)
Ni x	Largest tolerance of neighboring points	Largest temperature coefficient of neighboring points
Cu5	≤ ±1.6 °C (2.88 °F)	≤ ±0.040 °C/°C (°F/°F)
Cu10	≤ ±0.8 °C (1.44 °F)	≤ ±0.020 °C/°C (°F/°F)
Cu20	≤ ±0.4 °C (0.72 °F)	≤ ±0.010 °C/°C (°F/°F)
Cu50	≤ ±0.16 °C (0.288 °F)	≤ ±0.004 °C/°C (°F/°F)
Cu100	≤ ±0.08 °C (0.144 °F)	≤ ±0.002 °C/°C (°F/°F)
Cu200	≤ ±0.08 °C (0.144 °F)	≤ ±0.002 °C/°C (°F/°F)
Cu500	≤ ±0.16 °C (0.288 °F)	≤ ±0.002 °C/°C (°F/°F)
Cu1000	≤ ±0.08 °C (0.144 °F)	≤ ±0.002 °C/°C (°F/°F)
Cu x	Largest tolerance of neighboring points	Largest temperature coefficient of neighboring points
Linear resistance
0 ... 400 Ω	≤ ±40 mΩ	≤ ±2 mΩ/°C (1.11 mΩ/°F)
0 ... 100 kΩ	≤ ±4 Ω	≤ ±0.2 Ω/°C (0.11 Ω/°F)
Potentiometers
0 ... 100%	< 0.05%	< ± 0.005%
Supply voltage
mV: -20 ... 100 mV	≤ ±5 μV	≤ ±0.2 μV/°C (0.11 μV/°F)
mV: -100 ... 1700 mV	≤ ±0.1 mV	≤ ±36 μV/°C (20 μV/°F)
mV: ± 800 mV	≤ ±0.1 mV	≤ ±32 μV/°C (17.8 μV/°F)
TC
E	≤ ±0.2 °C (0.36 °F)	≤ ±0.025 °C/°C (°F/°F)
J	≤ ±0.25 °C (0.45 °F)	≤ ±0.025 °C/°C (°F/°F)
K	≤ ±0.25 °C (0.45 °F)	≤ ±0.025 °C/°C (°F/°F)
L	≤ ±0.35 °C (0.63 °F)	≤ ±0.025 °C/°C (°F/°F)
N	≤ ±0.4 °C (0.72 °F)	≤ ±0.025 °C/°C (°F/°F)
T	≤ ±0.25 °C (0.45 °F)	≤ ±0.025 °C/°C (°F/°F)
U	< 0 °C (32 °F) ≤ ±0.8 °C (1.44 °F) ≥ 0 °C (32 °F) ≤ ±0.4 °C (0.72 °F)	≤ ±0.025 °C/°C (°F/°F)
Lr	≤ ±0.2 °C (0.36 °F)	≤ ±0.1 °C/°C (°F/°F)
R	< 200 °C (392 °F) ≤ ±0.5 °C (0.9 °F) ≥ 200 °C (392 °F) ≤ ±1 °C (1.8 °F)	≤ ±0.1 °C/°C (°F/°F)
S	< 200 °C (392 °F) ≤ ±0.5 °C (0.9 °F) ≥ 200 °C (392 °F) ≤ ±1 °C (1.8 °F)	≤ ±0.1 °C/°C (°F/°F)
W3	≤ ±0.6 °C (1.08 °F)	≤ ±0.1 °C/°C (°F/°F)
W5	≤ ±0.4 °C (0.72 °F)	≤ ±0.1 °C/°C (°F/°F)
B²⁾	≤ ±1 °C (1.8 °F)	≤ ±0.1 °C/°C (°F/°F)
B³⁾	≤ ±3 °C (5.4 °F)	≤ ±0.1 °C/°C (°F/°F)
B⁴⁾	≤ ±8 °C (14.4 °F)	≤ ±0.8 °C/°C (°F/°F)
B⁵⁾	Not specified	Not specified
CJC (internal)	< ±0.5 °C (0.9 °F)	Included in basic accuracy
CJC (external)	≤ ±0.08 °C (0.144 °F)	≤ ±0.002 °C/°C (°F/°F)

¹⁾ Temperature coefficients correspond to the specified values or 0.002% of the input span, depending on which value is greater.

²⁾ Accuracy of the specification range > 400 °C (752 °F)

³⁾ Accuracy of the specification range > 160 °C (320 °F) < 400 °C (752 °F)

⁴⁾ Accuracy of the specification range > 85 °C (185 °F) < 160 °C (320 °F)

⁵⁾ Accuracy of the specification range < 85 °C (185 °F)

Output accuracy

Output type	Basic accuracy	Temperature coefficient
Average value measurement	Average of accuracy of input 1 and input 2	Average of temperature coefficient of input 1 and input 2
Differential measurement	Sum of accuracy of input 1 and input 2	Sum of temperature coefficient of input 1 and input 2
Analog output	≤ ±1.6 μA (0.01% of the full output span)	≤ ±0.48 μA/K (≤ ±0.003% of the full output span/K)

Dimensional drawings

SITRANS TF420, single chamber enclosure, dimensions in mm (inch)

SITRANS TF420, dual chamber enclosure, dimensions in mm (inch)

Circuit diagrams

Connections

Input connection

SITRANS TF420 in single chamber enclosure (7NG044*), input connection assignment

SITRANS TF420 in dual chamber enclosure (7NG045*), input connection assignment

Output connection

SITRANS TF420 in single chamber enclosure (7NG044*), output connection assignment

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SITRANS TF420 (HART, UNIVERSAL) Overview

Overview

Benefits

Application

Function

Configuration

Principle of operation

Technical specifications

Measuring ranges/Minimum measuring span

Input accuracy

Output accuracy

Dimensional drawings

Circuit diagrams

Connections