Wenglor UniBar Pressure Sensors and Electronic Pressure Switches
Wenglor UniBar pressure sensors measure the relative pressure of liquids and gases from -1 to 600 bar, with an integrated 7-segment display, two PNP switching outputs and an optional analog output, so one device serves as a pressure sensor and an electronic pressure switch.
Pressure Sensor and Electronic Pressure Switch in One
The Wenglor UniBar family measures the relative (gauge) pressure of liquid and gaseous media in closed systems over -1...600 bar and has an integrated 7-segment display. The applied pressure is measured by an electronic amplifier and passed to a microprocessor, which evaluates the programmable switching points and shows the current pressure on the display. The switching output provides the signal, and the optional analog output provides the measured value (0...10 V or 4...20 mA). A high-visibility switching state indicator allows affected sensors to be found quickly during maintenance.
UniBar sensors have two PNP NO/NC switchable outputs and an adjustable switching hysteresis, so the same device measures the pressure and also works as an electronic pressure switch that starts a pump, valve or alarm at the set thresholds.
FFAP246 and FFAP275: Verified Technical Data
| Parameter | FFAP246 | FFAP275 |
|---|---|---|
| Measuring range | 0...1 bar | 0...10 bar |
| Max. overload / burst pressure | 5 bar / 6 bar | 20 bar / 40 bar |
| Design note | Low-pressure lines; hydrostatic level measurement | Small pressure diaphragm for a space-saving process connection; front-flush (piggable) design for hygiene-critical areas (food, pharma) |
| Adjustable switching range | 4...100% of full scale | |
| Measurement error | below ±0.5% of full scale; switching hysteresis 2%; temperature drift 0.025%/K | |
| Medium and ambient temperature | -25...80 °C (both) | |
| Electrical data | 16...32 VDC, below 60 mA at 24 V; 2 PNP NO/NC switchable outputs below 250 mA, 30 ms response time; 10-bit resolution | |
| Protection and connection | IP65 (tested by Wenglor); M12×1, 4-pin connector; G 1/2" process connection | |
| Materials | Housing PBT, PC, FKM; control panel polyester; media-contact surfaces 1.4435, 1.4404 stainless steel | |
Family Scope and Model Selection
According to Wenglor's catalogue and brochure data, the UniBar family is offered in many pressure range and process connection combinations across -1...600 bar (G1/8", G1/4", G3/8" and G1/2" female and male connections; plastic FA/FM or stainless steel FX housings). Output configuration also varies by model: 2×PNP, 1×PNP+1×analog or 1×relay+1×analog.
weFlux² pressure sensors
A separate compact stainless steel family with an IO-Link interface covers -1...400 bar. Manufacturer's current list (23.09.2026):
| Model | FX1P | FX5P | FX6P | FX7P | FX8P | FX9P | FX0P |
|---|---|---|---|---|---|---|---|
| Range | -1...1 bar | -1...10 bar | -1...25 bar | 0...40 bar | 0...100 bar | 0...250 bar | 0...400 bar |
Common features: IO-Link interface, PNP output and analog output, relative measurement, medium temperature -10...125 °C (low ranges) or -25...125 °C (high ranges). The last digits of the model number set the connection: ...002 = G 1/2", ...003 = G 1/4". For hydrostatic level measurement from the height of a liquid column, a low range is required: FX1P (-1...1 bar) or UniBar FFAP246 (0...1 bar); high-range models cannot resolve a few metres of water column.
Applications
- Continuous pressure monitoring in process lines
- Monitoring and regulating pressure in filling systems
- Compressed air system monitoring
- Fill level detection in tank and silo systems through pressure measurement
- Pressure regulation of units such as pumps and compressors; see pumps
- Filter fouling and blockage monitoring through inlet-outlet pressure difference; see cartridge filter selection
Which pressure range, process connection and output type suit your process depends on the pressure band to be measured, the hygiene requirement and the existing automation infrastructure. Describe your application and we will select the model together. For a comparison with manometers, see the pressure gauge selection guide.
Documents
Frequently Asked Questions
Technical answers from Mikron Proses.
Does the Wenglor UniBar work as both a pressure sensor and a pressure switch?
Yes. The UniBar series measures relative pressure over -1...600 bar and, with its integrated 7-segment display, two PNP NO/NC switching outputs (adjustable threshold 4...100%, 30 ms response time) and an optional 4-20 mA / 0-10 V analog output, works as both a transmitter and an electronic pressure switch.
Where are the FFAP246 and FFAP275 models used?
FFAP246 (0...1 bar, overload 5 bar) is used for low-pressure lines and hydrostatic level measurement in open tanks; the front-flush FFAP275 (0...10 bar, overload 20 bar) is used for pressure control in food, pharmaceutical and general process lines.
What is the difference between UniBar and weFlux² pressure sensors?
UniBar sensors are display/switch type devices with a 7-segment display and setting keys; weFlux² (FX1P...FX0P, -1...400 bar) are compact stainless steel pressure transmitters without a display, parameterized through IO-Link 1.1.
Where can I buy Wenglor UniBar pressure sensors in Turkey?
Mikron Proses supplies Wenglor UniBar and weFlux² pressure sensors in Turkey as main seller of Wenglor fluid sensors, with engineering selection and application support. Contact us through the contact page.
Which pressure sensor should I use for hydrostatic level measurement?
A low range is needed so that a liquid column of a few metres produces a usable signal: FX1P (-1...1 bar) or UniBar FFAP246 (0...1 bar). High-range models cannot resolve a few metres of water column.
Planning a project? Send us your flow rate, feed water source and target water quality to [email protected] — our engineers will reply with a technical proposal.