Keller LEO Series
KELLER digital pressure gauges (LEO1, LEO2, LEO3, LEO Ultimate) for service, testing and calibration.
The LEO series brings together KELLER digital pressure gauges with a piezoresistive measuring element and an LCD display, intended for service, testing and calibration. LEO1 and LEO2 run on a CR2430 battery and show the pressure together with the minimum or maximum value since the last reset. LEO3 adds a 4...20 mA output, through whose loop it is powered, and an RS485 interface. LEO Ultimate is a high-accuracy reference instrument, with USB and Bluetooth interfaces and an IP67 metal housing.
We prepare the quotation on the basis of the exact identification of the gauge. Please send us the model name (LEO1, LEO2, LEO2-Ei, LEO3 or Ultimate; for LEO5 a photo of the nameplate helps), the pressure range in bar, the connection type and, where applicable, whether the instrument works in an area with explosion risk. We check the configuration in the manufacturer's current documentation before quoting. The lead time is usually 1–4 weeks to order, and 24–72 h when the item is available locally or at the supplier.
Models and codes
| Code | Note |
|---|---|
| LEO1 | −1...3 to 0...1000 bar, ±0.1 %FS, peak recording, no interface |
| LEO2 | 0...4 to 0...700 bar, ±0.1 %FS, no interface, CR2430 battery |
| LEO2-Ei | intrinsically safe variant of the LEO2, for potentially explosive atmospheres (mentioned in the datasheet) |
| LEO3 | −1...3 to 0...1000 bar, 4...20 mA output and RS485 |
| LEO Ultimate | −1...1 to 0...1000 bar, ±0.05 %FS, USB and Bluetooth, IP67 |
| LEO5 | frequently requested name; the manufacturer's documentation points to LEO Ultimate, and the specifications are confirmed on the existing instrument |
Key specifications
| LEO2 pressure range | 0...4 – 0...700 bar |
|---|---|
| LEO1 and LEO3 pressure range | −1...3 – 0...1000 bar |
| LEO1, LEO2, LEO3 accuracy | ±0.1 %FS |
| LEO1, LEO2, LEO3 total error band | ±0.2 %FS at 0...50 °C |
| LEO Ultimate accuracy | ±0.05 (optional ±0.01) %FS |
| Power supply | CR2430 (LEO1, LEO2); 4...20 mA loop (LEO3) |
| Interfaces | LEO3: RS485 and 4...20 mA; LEO Ultimate: USB 2.0 and Bluetooth BLE |
| LEO2 battery life | up to 1000 ore |
In the manufacturer's documentation LEO1, LEO2, LEO3 and LEO Ultimate are active, and the LEO2 datasheet is dated 06/2025. The manufacturer's documentation for LEO5 currently points to LEO Ultimate, so LEO5 no longer appears as a separate product.
Frequently asked questions
What do I need to send for a quotation on a LEO gauge?
The model name from the instrument (LEO1, LEO2, LEO3, LEO Ultimate), the pressure range in bar and the connection type. If you have a LEO5 or a code from which the configuration cannot be read, a photo of the nameplate lets us identify the instrument.
Can I replace a LEO5?
The manufacturer's documentation for LEO5 points to LEO Ultimate. We do not have a current datasheet for LEO5, so functional equivalence and the pressure range are confirmed from the data of the existing instrument before quoting.
Is there a variant for areas with explosion risk?
The LEO2 datasheet mentions the intrinsically safe LEO2-Ei variant. For it only the CR2430 battery from Renata is permitted. We check the exact classification in the manufacturer's documentation.
Other Keller series
The current LEO5 specifications and the full order codes (process connection, variants) are checked by code before quoting.
Updated: 2026-11-12