Keller LEO 3 Digital Manometer

Introduction – Keller LEO 3 Digital Manometer

The Keller LEO 3 Digital Manometer is a high-precision measuring instrument designed for industrial pressure monitoring, calibration, and process control. Engineered with an insulated piezoresistive pressure sensor, it delivers accurate and stable performance across a wide range of pressure applications from –1 bar up to 1000 bar. Its integrated LCD display shows live pressure values, along with Min/Max readings or analog output values, enabling operators to view critical data directly on the device.

The LEO 3 includes a scalable 4–20 mA analog output and a robust RS485 bus interface, allowing seamless integration into industrial automation, pump control systems, and pressure testing setups. Users can configure pressure units, perform zero-point calibration, or rescale the analog output directly through the device or through Keller’s configuration software.

Keller’s proprietary ManoConfig and CCS30 software tools provide extensive setup and data-logging capabilities, ensuring easy commissioning and accurate measurement recording. This makes the LEO 3 an ideal choice for industrial buyers, automation engineers, and calibration professionals seeking high reliability. Dubai Sensor supplies the Keller LEO 3 to customers across the UAE and the wider MENA region, supporting local industrial and testing applications.

Key Features & Benefits

• High-accuracy piezoresistive pressure sensor (±0.1% FS)
  
• Total error band within ±0.2% FS (0…50°C)
  
• Wide pressure range options from –1…3 bar up to 0…1000 bar
  
• Scalable 4–20 mA analog output with turn-down functionality
  
• RS485 half-duplex digital interface (Keller bus protocol)
  
• Supports up to 128 devices on the RS485 bus
  
• Zero-point calibration directly via front-panel buttons
  
• Min/Max function for pressure evaluation
  
• Multiple pressure units plus 5 user-defined units
  
• IP65 protection for industrial environments
  
• Robust stainless-steel wetted materials (AISI 316L / AISI 318LN depending on range)
  
• Compatible with Keller ManoConfig & CCS30 software
  
• Optional rubber protective cover for harsh conditions
  
• Digital display with clear 4½-digit readout for pressure or analog value
  

Technical Specifications – Keller LEO 3 Digital Manometer

Performance

Pressure Ranges

Electrical

Display

Mechanical

Environmental

Standards & Certifications

• CE conformity according to 2014/30/EU (EMC)
  
• EN IEC 61326-1 / 61326-2-3
  
• EN IEC 61000-6-1 / 61000-6-2
  
• EN IEC 61000-6-3 / 61000-6-4
  
• Keller production certified according to ISO 9001
  

Applications & Industries

The Keller LEO 3 Digital Manometer is suitable for:

• Pump control and monitoring
  
• Fluid mechanics and hydraulic systems
  
• Pressure testing and leak testing
  
• General industrial process monitoring
  
• Maintenance and calibration workshops
  
• Manufacturing and utility systems
  
• OEM instrumentation solutions
  

The device is widely used in the UAE and MENA region for industrial plants, testing facilities, water systems, and automation applications due to its accuracy and compact design.

Installation, Commissioning & Maintenance

• Install the manometer using the appropriate pressure connection (G1/4 standard or optional 1/4” NPT).
  
• Ensure the device is mounted vertically with the pressure port facing downward for optimal accuracy.
  
• Supply 8–32 VDC to the 4–20 mA loop using the correct pin assignment of the 5-pin connector.
  
• Use Keller ManoConfig software to set pressure units, adjust zero point, or rescale output.
  
• RS485 communication parameters (address, baud rate) can be modified as required.
  
• Periodic recalibration is recommended due to ±0.2% FS per year long-term stability.
  
• For harsh environments, the optional rubber cover adds impact and wear resistance.
  

Why Choose Keller LEO 3 Digital Manometer

The Keller LEO 3 offers a rare combination of precision, configurability, and industrial robustness. With a ±0.1% FS accuracy, high-quality stainless-steel construction, and an integrated analog + digital communication interface, it provides the reliability required in demanding industrial measurement tasks.

Its compatibility with Keller’s free software tools makes setup and data acquisition intuitive. For engineers seeking a compact yet advanced digital manometer that delivers consistent and traceable results, the LEO 3 is an excellent investment. Through Dubai Sensor, customers benefit from local availability and technical support across the UAE and MENA region.

Ordering Guide

1. Select the pressure range based on your application (relative or absolute, –1…3 to 0…1000 bar).
   
2. Choose the pressure connection (G1/4 standard or 1/4” NPT).
   
3. Confirm required accessories, such as RS485–USB interface (K-114) or rubber protective cover.
   
4. Specify calibration certificate (5-point, 11-point, or external accredited).
   
5. Verify output requirements, including scaling of the 4–20 mA signal.
   

Dubai Sensor supplies the Keller LEO 3 Digital Manometer as an official distributor, offering assistance with model selection, configuration, and technical support.

FAQ – Keller LEO 3 Digital Manometer

1. What pressure ranges are available for the Keller LEO 3?

The LEO 3 is available in multiple ranges, including relative pressure from –1…3 bar up to –1…30 bar, and absolute pressure up to 0…1000 bar, depending on the model.

2. Does the LEO 3 support both analog and digital outputs?

Yes. It provides a 4–20 mA analog output (2-wire) and a RS485 digital interface that uses Keller’s proprietary protocol.

3. Can the analog output be rescaled?

Yes. The 4–20 mA output is fully scaleable (turn-down) using the device’s front-panel buttons or through Keller ManoConfig software.

4. Which communication protocol does the RS485 interface support?

The LEO 3 supports the Keller bus protocol.
MODBUS RTU is not supported.

5. What is the accuracy of the device?

The accuracy is ±0.1% FS, with a total error band of ±0.2% FS over 0…50°C.

6. What pressure units can be displayed?

The LEO 3 supports bar, mbar, hPa, kPa, MPa, PSI, kp/cm², plus 5 user-defined units configurable through software.

7. Is the LEO 3 suitable for industrial environments?

Yes. It comes with IP65 protection, stainless-steel wetted materials, and an optional rubber protective cover for harsher conditions.

8. What are the power supply requirements?

The device operates on 8–32 VDC in a 2-wire loop-powered configuration.

9. Does the LEO 3 include data logging or configuration software?

Yes. Keller provides ManoConfig (for configuration) and CCS30 (for measurement recording and export). Both are license-free.

10. What connectors are supplied with the device?

The LEO 3 uses a 5-pin round plug (M16×0.75). Units are supplied with a 5-pin Binder mating connector for electrical connection.