Purpose:
The U-50 series multi-parameter water-quality meter simultaneously measures and displays 11 parameters. Rugged, powerful and GPS-equipped, it is ideal for testing rivers, ground-water and waste-water.
Features:
• Read-outs in five languages (English, Japanese, Russian, Spanish, Portuguese)
• Simultaneous display of 11 parameters: pH, pH (mV), ORP, dissolved oxygen, conductivity, salinity, TDS, seawater specific gravity, temperature, turbidity and water depth
• U-53 turbidity probe meets US EPA requirements; resolution 0.01 NTU with automatic cleaning brush
• U-54 turbidity probe complies with EN ISO 7027; resolution 0.01 NTU
• Improved DO probe gives faster response and easier maintenance
Main Unit & Probe Specifications
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Main Unit
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|
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Dimensions
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115 mm W × 65 mm D × 280 mm H
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Weight
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approx. 800 g (1.76 lb)
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LCD
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320 × 240 back-lit monochrome
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Data port / memory
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USB, 10 000 data sets
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Battery
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4 × AA dry cells
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Battery life
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U-51/52/52G/54/54G ≈ 70 h (back-light off, 20 °C); U-53/53G ≈ 500 measurement cycles
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Protection
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JIS 7 (with cable attached)
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Storage / operating temp.
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–10 – 60 °C / –5 – 45 °C
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Probe
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Diameter × length
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approx. 96 mm × 340 mm
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Weight
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approx. 1 800 g (3.97 lb)
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Cable length
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2 m std.; optional 10 m or 30 m
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Measuring depth
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0 – 30 m
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Auto-cal.
|
pH 4 buffer (all models)
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Wetted materials
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PPS, glass, SIS316L, SUS304, FKM, PEEK, quartz, titanium, FEP membrane, POM
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Protection
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JIS 8
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Turbidity wiper
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built-in on U-53 & U-53G only
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Measurement Performance
|
Parameter
|
Range
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Accuracy
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Repeatability
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Resolution
|
|
Temperature
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–10 – 55 °C
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±0.3 °C
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±0.1 °C
|
0.01 °C
|
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pH
|
0 – 14
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±0.1
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±0.05
|
0.01
|
|
ORP
|
–2 000 – +2 000 mV
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±15 mV
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±5 mV
|
1 mV
|
|
Dissolved O₂
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0 – 50 mg L⁻¹
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±0.2 mg L⁻¹ (0-20); ±0.5 mg L⁻¹ (20-50)
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±0.1 mg L⁻¹
|
0.01 mg L⁻¹
|
|
Salinity / Conductivity
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0 – 70 ppt
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±3 ppt
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±1 ppt
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0.1 ppt
|
|
Depth
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0 – 30 m
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±0.3 m
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±1 % FS
|
0.05 m
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|
Turbidity (LED) U-51/52/52G
|
0 – 800 NTU
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±3-5 % FS or ±1 NTU
|
±3-5 % FS or ±0.5 NTU
|
0.1 NTU (0-100); 1 NTU (100-800)
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|
Turbidity (LED) U-53/53G/54/54G
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0 – 1 000 NTU
|
same as above
|
same as above
|
same as above
|
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TDS
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0 – 100 g L⁻¹
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±5 g L⁻¹
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±2 g L⁻¹
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0.1 g L⁻¹
|
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Seawater specific gravity
|
0 – 50 δt
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±5 δt
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±2 δt
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0.1 δt
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Notes
*Battery life measured with alkaline AA cells, display temp. ≥ 20 °C, back-light off.
*Accuracy for turbidity & conductivity after 4-point calibration; other items after 2-point calibration with standard solutions.
*Repeatability values refer to measurements in standard solutions.
Model Comparison (✓ = included)
|
Parameter
|
U-51
|
U-52
|
U-52G
|
U-53
|
U-53G
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U-54
|
U-54G
|
|
pH
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✓
|
✓
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✓
|
✓
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✓
|
✓
|
✓
|
|
ORP
|
✓
|
✓
|
✓
|
✓
|
✓
|
✓
|
✓
|
|
Dissolved oxygen
|
✓
|
✓
|
✓
|
✓
|
✓
|
✓
|
✓
|
|
Conductivity
|
✓
|
✓
|
✓
|
✓
|
✓
|
✓
|
✓
|
|
Salinity
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✓
|
✓
|
✓
|
✓
|
✓
|
✓
|
✓
|
|
TDS
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✓
|
✓
|
✓
|
✓
|
✓
|
✓
|
✓
|
|
Seawater specific gravity
|
✓
|
✓
|
✓
|
✓
|
✓
|
✓
|
✓
|
|
Temperature
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✓
|
✓
|
✓
|
✓
|
✓
|
✓
|
✓
|
|
Turbidity (LED)
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—
|
✓
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✓
|
—
|
—
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✓
|
✓
|
|
Turbidity (tungsten)
|
—
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—
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—
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✓
|
✓
|
—
|
—
|
|
Water depth
|
—
|
—
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✓
|
✓
|
✓
|
✓
|
✓
|
|
GPS
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—
|
—
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✓
|
—
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✓
|
—
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✓
|
*U-54/G (2 m cable) has no depth sensor.
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