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231393
Pepperl + Fuchs 231393 available at EU Automation. Get in touch today for a quick price.
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What happens next?
1. Email confirmation
You will get an email confirming that we have received your enquiry.
2. Dedicated Account Manager
One of our team will be in touch to confirm your part(s) specification and condition.
3. Your quote
You will receive a comprehensive quote tailored to your specific needs.
The Pepperl+Fuchs 231393, model KFD2-STC4-Ex1.H, is a single-channel isolated barrier and SMART transmitter power supply for process automation applications. It supplies 2-wire and 3-wire SMART transmitters in hazardous areas while transferring a galvanically isolated 0/4–20 mA signal to the control side. The module supports bidirectional HART, BRAIN and Foxboro communication, with integrated HART test points and an internal 250 Ω communication resistor. Operating from a 20–35 V DC supply through terminals or a Power Rail, it provides up to 17.6 V DC field voltage, supports loads up to 800 Ω and is rated up to SIL 2. The IP20 housing mounts on a standard 35 mm DIN rail and operates across an ambient temperature range of -20°C to 60°C.
| Specification | Description |
|---|---|
| Manufacturer | Pepperl+Fuchs |
| Part Number | 231393 |
| Model | KFD2-STC4-Ex1.H |
| Product Type | SMART transmitter power supply and isolated barrier |
| Number of Channels | 1 |
| Signal Type | Analog input |
| Supported Field Devices | 2-wire and 3-wire SMART transmitters; 2-wire SMART current sources |
| SMART Protocols | HART, BRAIN and Foxboro |
| Input Signal | 0/4–20 mA |
| Output Signal | 0/4–20 mA, with overload above 25 mA |
| Supply Voltage | 20–35 V DC |
| Supply Connection | Power Rail or terminals 14+ and 15− |
| Power Consumption | 1.9 W |
| Power Dissipation | 1.5 W |
| Available Field Voltage | At least 17.6 V at 20 mA using terminals 1+ and 3 |
| Output Load | 0–800 Ω at 20 mA |
| Internal HART Resistance | 250 Ω between terminals 8 and 9 |
| Output Ripple | Maximum 50 µA RMS |
| Signal Deviation | Maximum 10 µA at 20°C, including calibration, linearity, hysteresis, load and supply-voltage variations |
| Ambient Temperature Influence | 0.25 µA/K |
| Frequency Range | Field to control side: 0–7.5 kHz; control to field side: 0.3–7.5 kHz |
| Settling Time | 200 µs |
| Rise/Fall Time | 20 µs |
| Functional Safety Rating | SIL 2 in accordance with IEC 61508 |
| Hazardous-Area Application | Intrinsically safe interface for Zones 0, 1 and 2 and Divisions 1 and 2 |
| Galvanic Isolation | Input/output and input/power supply separation in accordance with IEC/EN 60079-11 |
| Status Indication | Green power LED |
| Test Facilities | Integrated terminal test points for HART communicators |
| Terminal Type | Removable screw terminals |
| Mounting | 35 mm DIN rail in accordance with EN 60715 |
| Degree of Protection | IP20 |
| Operating Temperature | −20 to 60°C |
| Dimensions | 20 × 124 × 115 mm |
| Housing Type | B2 |
| Approximate Mass | 200 g |
| Approvals | ATEX, IECEx and cULus |
What type of device is this?
It is a single-channel isolated barrier and SMART transmitter power supply designed to interface field instruments in hazardous areas with control equipment in a safe area.
Which field instruments can be connected?
The device supports 2-wire and 3-wire SMART transmitters, as well as 2-wire SMART current sources.
What input and output signals does it support?
It accepts a 0/4 mA to 20 mA analogue input and transfers it to the control side as an electrically isolated 0/4 mA to 20 mA output.
Does it support HART communication?
Yes. Bidirectional HART communication can be superimposed on the analogue signal. Integrated test sockets also allow a HART communicator to be connected.
Which other SMART communication protocols are supported?
In addition to HART, the 231393 supports BRAIN and Foxboro SMART communication protocols.
What is the required supply voltage?
The rated supply range is 20 V DC to 35 V DC. Power can be provided through the Power Rail or through terminals 14+ and 15-.
What load can be connected to the output?
The output supports a load of 0 to 800 ohms at 20 mA.
What is the purpose of the internal 250-ohm resistor?
The internal 250-ohm resistor between terminals 8 and 9 can be used when the loop resistance is too low for reliable HART communication.
What level of galvanic isolation is provided?
The input and output, as well as the input and power supply, are galvanically isolated with a specified peak isolation value of 375 V. The output-to-power-supply connection has functional insulation rated at 50 V AC.
Can it be used with instruments installed in hazardous areas?
Yes. It is designed for intrinsically safe applications and carries ATEX, IECEx and cULus-related approvals for specified gas, dust and mining environments. Installation must follow the applicable certification and control documentation.
What are its operating temperature and ingress protection ratings?
The specified ambient operating temperature range is -20°C to 60°C, and the enclosure has an IP20 rating.
How is the device mounted?
It mounts on a standard 35 mm DIN rail in accordance with EN 60715. It can also connect to a compatible Power Rail arrangement.
What are the device dimensions and approximate mass?
The unit measures approximately 20 × 124 × 115 mm and has a mass of about 200 g.
What indication is provided on the front panel?
A green LED indicates the power-supply status. The front panel also includes a labelling area and removable terminal blocks.
What functional integrity rating does it meet?
The device is rated up to SIL 2 in accordance with IEC 61508 when applied within the specified system design and operating conditions.
- Supplying two-wire and three-wire SMART transmitters in hazardous areas
- Providing galvanic isolation between field instrumentation and control systems
- Transmitting 0/4–20 mA analogue signals to safe-area equipment
- Enabling bidirectional HART communication across isolated process loops
- Connecting SMART current sources to industrial control and monitoring equipment
- Supporting BRAIN and Foxboro communication protocols in process applications
- Increasing available field voltage for demanding transmitter installations
- Integrating intrinsically safe instrumentation within Zone 0, Zone 1 and Zone 2 environments
- Monitoring pressure, temperature, flow and level transmitters in process plants
- Supporting SIL 2 measurement loops in industrial automation systems
- Mounting signal isolation channels on 35 mm DIN rail or Pepperl+Fuchs Power Rail systems
This content has been produced using multiple sources. EU Automation takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
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Customer reviews
steve
Daniel
Excellent customer service...
Alex Bailey is my main point of contact at EU Automation...he is extremely friendly, has exceptional customer service skills and always offers great pricing & lead times.
4 months ago
Jerry Schrink
Tom Higgins provided amazing service
Tom Higgins provided great prompt service. I contacted Tom by phone and within 10 minutes there was a quote in my in box. WOW Thank you Tom and Thank you EU Automation!
4 months ago
Paulo Pereira
Excellent service and communication…
Excellent service and communication from Alex Bailey. He truly goes above and beyond to ensure his clients are 100% satisfied. The entire process was seamless, and his attention to detail made a huge difference. Highly recommended for anyone looking for amazing service!
4 months ago
Gary
Tom Higgins did a great job at getting…
Tom Higgins did a great job at getting us the part we needed. He saw a concern with the part a verified before shipping.
5 months ago
Lessle Smith
Thomas Higgins has gone above and…
Thomas Higgins has gone above and beyond to make things happen for my facility. His customer service and knowledge were an asset in helping me with my order and the logistics challenges!
5 months ago
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