LAQUA U-51
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LAQUA U-51

Overview

The HORIBA LAQUA U-51 is a professional field-ready multi-parameter water quality checker designed for environmental monitoring, groundwater investigations, wastewater treatment, aquaculture, and industrial water analysis. As part of the U-50 Series, the U-51 integrates multiple sensors into a single probe, enabling simultaneous measurement and display of up to 10 key water quality parameters in one test. Its rugged waterproof construction, automatic calibration, and large data storage capacity make it ideal for demanding field applications.

Key Features

  • Simultaneous measurement of up to 10 water quality parameters
  • Integrated multi-sensor probe design
  • One-touch automatic calibration
  • Real-time monitoring with Auto-Hold function
  • USB connectivity for easy data transfer
  • Large backlit LCD display
  • Diagnostic functions for sensor status monitoring
  • User-replaceable sensors
  • Data storage for up to 10,000 records
  • Waterproof construction for field use
  • Measurement depth up to 30 m depending on configuration

Measured Parameters

  • pH
  • ORP (Oxidation Reduction Potential)
  • Dissolved Oxygen (DO)
  • Conductivity
  • Salinity
  • Total Dissolved Solids (TDS)
  • Seawater Specific Gravity
  • Temperature

The U-51 model focuses on core water quality parameters and does not include turbidity or GPS functions found in higher U-50 Series models.

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Description

Technical Specifications

Parameter Specification
pH Range 0.00 – 14.00 pH
pH Resolution 0.01 pH
pH Accuracy ±0.1 pH
ORP Range -2000 to +2000 mV
ORP Resolution 1 mV
ORP Accuracy ±15 mV
Dissolved Oxygen Range 0.00 – 50.0 mg/L
DO Resolution 0.01 mg/L
DO Accuracy ±0.2 mg/L (0–20 mg/L), ±0.5 mg/L (20–50 mg/L)
Conductivity Range 0 – 10 S/m (0 – 100 mS/cm)
Salinity Range 0 – 70 ppt
TDS Range 0 – 100 g/L
Temperature Range -5°C to 55°C
Temperature Resolution 0.01°C
Data Memory 10,000 records
Display 320 × 240 Graphic LCD with Backlight
Communication USB
Power Supply 4 × C-size Batteries
Battery Life Approx. 70 hours
Probe Diameter Approx. 96 mm
Probe Length Approx. 340 mm
Probe Weight Approx. 1.8 kg
Maximum Measurement Depth Up to 30 m
Waterproof Rating JIS Protection Class 8 (Probe), IP67 Control Unit

Applications

  • River and lake monitoring
  • Groundwater investigations
  • Wastewater treatment monitoring
  • Aquaculture and fisheries
  • Environmental impact assessments
  • Drinking water source monitoring
  • Industrial process water testing
  • Research and academic institutions

Benefits

The U-51 combines multiple water quality measurements into a single portable instrument, reducing the need for separate meters and simplifying field operations. The integrated probe design, automatic calibration, and rugged construction help improve efficiency while delivering reliable results in challenging environments.

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