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Brand: Pepperl+Fuchs
Pepperl+Fuchs KFD2-UT2-Ex1 Universal Temperature Converter
Description
KFD2-UT2-Ex1 universal temperature converter, one channel, 20 mm housing
The KFD2-UT2-Ex1 is a single-channel isolated barrier from the Pepperl+Fuchs K-System that reads a resistance thermometer, thermocouple, potentiometer or millivolt source located in a hazardous area and converts it into a 0 or 4 to 20 mA signal for the safe area. It is configured by PACTware software through a front programming socket, so there is no keypad or display to learn.
Reading the part number: KFD2 is the 24 V DC isolated barrier range in a 20 mm housing, UT2 is the second generation universal temperature converter, and Ex1 means one channel with an Ex ia field circuit. The two-channel sibling is KFD2-UT2-Ex2, and the 12.5 mm KCD2-UT2-Ex1 covers the same single-channel job in a narrower case.
Seven Star LLC supplies this module in Oman and the GCC as an independent supplier in Muscat.
Technical specifications of the KFD2-UT2-Ex1
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Pepperl+Fuchs KFD2-UT2-Ex1 |
| RTD inputs | Pt10, Pt50, Pt100, Pt500, Pt1000 (EN 60751), the GOST versions of the same Pt types, Cu10, Cu50, Cu100 and Ni100 (DIN 43760); 2-, 3- or 4-wire; lead resistance max. 50 Ω per line; measuring current approx. 200 µA |
| Thermocouples | B, E, J, K, N, R, S, T (IEC 584-1), L (DIN 43710), TXK, TXKH, TXA; external or internal cold junction compensation |
| Potentiometer / voltage | 0 to 20 kΩ (2-wire) or 0.8 to 20 kΩ (3-wire); voltage selectable within -100 to 100 mV, input resistance ≥ 1 MΩ |
| Output | 0 to 20 mA or 4 to 20 mA; source mode load 0 to 550 Ω with open-circuit voltage ≤ 18 V; sink mode with 5 to 30 V across the terminals |
| Fault signal | Downscale 0 or 2 mA, upscale 21.5 mA (NAMUR NE 43) |
| Accuracy after calibration | Pt100 4-wire: ± (0.06 % of value in K + 0.1 % of span + 0.1 K); thermocouple: ± (0.05 % of value in °C + 0.1 % of span + 1 K), 1.2 K for types R and S, including ± 0.8 K cold junction error; mV: ± (50 µV + 0.1 % of span) |
| Reaction time | mV 1 s; thermocouple 1.1 s; 3- or 4-wire RTD 920 ms; 2-wire RTD 800 ms; potentiometer 2.05 s |
| Supply | 20 to 30 V DC, terminals 14+/15- or Power Rail; power dissipation ≤ 0.98 W |
| Functional safety | SIL 2 acc. to IEC/EN 61508 / IEC/EN 61511 |
| Hazardous area data | CESI 04 ATEX 143, [Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I; inputs Uo 9 V, Io 22 mA, Po 50 mW; IECEx TUN 07.0003 |
| Ambient temperature | -20 to 60 °C |
| Housing | Type B2, 20 x 119 x 115 mm, IP20, approx. 130 g, screw terminals, 35 mm DIN rail |
How the KFD2-UT2-Ex1 measures and reports faults
The module excites the sensor, measures it, linearises the characteristic for the selected type and drives a proportional output current. Line fault detection is built in: for RTDs it covers both sensor breakage and sensor short-circuit, for thermocouples it covers breakage. When a fault is found the output goes to the configured downscale or upscale value and an LED lights, while a collective error message is passed to the Power Rail.
For thermocouples the removable K-CJC-** terminal block is an accessory that gives internal cold junction compensation; without it, a fixed or externally measured reference temperature has to be configured. The programming input is not isolated from the supply, which is why the PACTware cable itself provides the galvanic isolation and avoids ground loops.
System fit and related parts
Use the KFD2-UT2-Ex1 for one temperature point per module and a 4 to 20 mA analog input at the control system. If two sensors are to share one 20 mm housing, take the KFD2-UT2-Ex2. If the rack space is tight, the KCD2-UT2-Ex1 saves 7.5 mm per loop. If local trip contacts and a display are needed, the KFD2-GUT-Ex1.D is the better fit, and KFD2-GUT-1.D is the version without hazardous-area input rating.
Selection and ordering checklist
- Sensor type, number of wires and measuring range.
- Output range (0 to 20 or 4 to 20 mA) and source or sink mode.
- Fault level: downscale 0 or 2 mA, or upscale 21.5 mA.
- Cold junction method for thermocouples and whether a K-CJC terminal block is needed.
- Ex ia entity values of the sensor and cable against Uo 9 V, Io 22 mA, Po 50 mW.
- PACTware and a programming cable for commissioning.
Installation, commissioning and maintenance of the KFD2-UT2-Ex1
Snap the module on a DIN rail, wire the sensor to terminals 1 to 4 and the loop to terminals 7 to 9, then program it. A decade box for RTDs or a millivolt calibrator for thermocouples lets you verify the characteristic at zero, mid and full scale. Keep the PACTware parameter file with the loop sheet so a replacement module can be loaded identically.
In service the module needs no routine adjustment. Inspect terminals for corrosion in coastal plants, keep ambient temperature inside the stated range and record the fault LED behaviour during loop checks.
Accuracy and wiring practice with the KFD2-UT2-Ex1
The deviation figures in the datasheet are made of three terms: a share of the measured value, a share of the span and a fixed offset. Because the span term scales with the configured range, setting an unnecessarily narrow range increases the relative error. For long RTD cables use three or four wires, since two-wire connections add the cable resistance to the reading. For thermocouples, route the compensating cable to the cold junction block without intermediate joints.
Ambient temperature influences are given per kelvin of change from 23 °C, and supply voltage influence is below 0.01 % of span, so the main error sources in practice are the sensor, the cable and the reference junction.
Typical applications in Oman and the GCC
The KFD2-UT2-Ex1 is used in refineries, gas plants, power stations and desalination units where skin, bearing, process and stack temperatures in Zone 0, 1 or 2 are brought to a DCS or PLC. Warm marshalling rooms are common in the region, so check cabinet temperature against the 60 °C limit and leave spacing between modules.
Family comparison
| Part | Key difference |
|---|---|
| KFD2-UT2-Ex1 (this part) | 1 channel, 20 mm, PACTware |
| KFD2-UT2-Ex2 | 2 channels in a 20 mm housing |
| KCD2-UT2-Ex1 | 1 channel, 12.5 mm housing |
| KFD2-GUT-Ex1.D | 1 channel with 2 relays and display |
Information to send with an RFQ
- Part number KFD2-UT2-Ex1 and quantity
- Sensor type and range
- Output mode and fault level
- Zone and gas group
- Supply method (Power Rail or terminals)
- Delivery location
Documents and quotation
The manufacturer datasheet for KFD2-UT2-Ex1 is attached on this page, so you can check wiring, approvals and dimensions before ordering. Send the exact part number, quantity and delivery location in Oman or the GCC and Seven Star LLC will reply with a quotation.
Seven Star LLC is an independent supplier in Muscat and is not the manufacturer; confirm availability, lead time and any project approval requirements in your RFQ.
Datasheets & Documents
- Datasheet Pepperl+Fuchs KFD2-UT2-Ex1 Datasheet Download
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About brand
Pepperl+Fuchs is a German manufacturer of industrial sensors and explosion protection equipment, founded in 1945 in Mannheim by Walter Pepperl and Ludwig Fuchs as a radio repair shop. Defective transformers led them into manufacturing, and the company developed its first proximity switch in the late 1950s. Pepperl+Fuchs is headquartered in Mannheim and is a pioneer of intrinsically safe electrical equipment for hazardous areas.
Seven Star LLC lists Pepperl+Fuchs sensors, isolated barriers, power supplies and hazardous-area mobile devices, and supplies them to instrument and automation teams in Oman by exact model designation.
Pepperl+Fuchs company profile
| Founded | 1945, Mannheim-Sandhofen, Germany, by Walter Pepperl and Ludwig Fuchs |
|---|---|
| Headquarters | Mannheim, Germany |
| Ownership | Privately owned (Pepperl+Fuchs SE) |
| Origins | Radio repair workshop that began making replacement transformers |
| Product families | Inductive, capacitive, ultrasonic and photoelectric sensors, rotary encoders, R2000 LiDAR scanners, KFD and HiC isolated barriers, Zener barriers, remote I/O, purge and pressurization systems, Ex-rated enclosures |
Milestones
- 1945: Walter Pepperl and Ludwig Fuchs open their radio repair shop in Mannheim.
- 1958: The first proximity switch is developed (some company sources say 1959).
Pepperl+Fuchs product families on this page
On the interface side there are two systems. The K-System mounts on DIN rail and is represented here by the KFD2-UT2-Ex2 universal temperature converter. The H-System plugs into termination boards and is represented by the HiD2030 SMART transmitter power supply with HART. The PS1000-A6-24.20 is a 24 VDC, 20 A power supply for cabinets. Sensors listed include the NJ2-12GK-SN NAMUR inductive sensor, the R101 retro-reflective photoelectric sensor and the R2000 2-D LiDAR scanner. For field staff there are the Tab-Ex 05 DZ1 tablet for Zone 1/21 areas and the Smart-Ex 03 DZ2 smartphone for Zone 2/22 and Division 2 areas.
Where Pepperl+Fuchs equipment is used
Isolated barriers sit between field instruments in Zone 0 or Zone 1 and the DCS or safety system in refineries, gas plants and chemical works. NAMUR sensors report valve position and machine states in classified areas. Photoelectric sensors and LiDAR scanners work in conveying, packaging, warehousing and vehicle guidance. Ex-rated tablets and phones are carried on operator rounds and maintenance jobs.
Pepperl+Fuchs products we list
Ordering Pepperl+Fuchs parts: what we need
Send the complete model designation as printed on the device, including every suffix; a single letter can change the supply voltage or the output type. Add the part number if the label shows one. For barriers, tell us the field device and signal type, the number of channels and whether the safety loop needs a SIL-assessed module. For mobile devices, state the zone or division and the regional radio version.
Facts checked against Pepperl+Fuchs's own chronicle pages, October 2026.
Browse Pepperl+Fuchs products by category: Sensors & Transmitters, Industrial Computer, Isolator & Barrier, Power Modules.
FAQ
Questions about the Pepperl+Fuchs KFD2-UT2-Ex1 Universal Temperature
Answers from our engineering team on installation, compatibility and integration.
01Which sensors can the KFD2-UT2-Ex1 read?
Pt, Cu and Ni RTDs, thermocouple types B, E, J, K, N, R, S, T, L, TXK, TXKH and TXA, potentiometers and voltage from -100 to 100 mV.
02How is the module configured?
With PACTware through the front programming socket. The input and the supply are not isolated from the programming input, so the cable provides isolation.
03What output does it provide?
A 0 or 4 to 20 mA signal in source mode (0 to 550 Ω load) or sink mode, with downscale 0 or 2 mA and upscale 21.5 mA fault signals.
04What are the entity values of the input?
Uo 9 V, Io 22 mA and Po 50 mW at terminals 1 to 4, under certificate CESI 04 ATEX 143.
05What is the temperature limit?
Ambient -20 to 60 °C, in a 20 mm type B2 housing with IP20 protection.
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