U-50 series Feature comparison
| U-51 | U-52 | U-52G | U-53 | U-53G | |
|---|---|---|---|---|---|
| pH | ○ | ○ | ○ | ○ | ○ |
| Dissolved Oxygen | ○ | ○ | ○ | ○ | ○ |
| Conductivity | ○ | ○ | ○ | ○ | ○ |
| Salinity | ○ | ○ | ○ | ○ | ○ |
| TDS(Total Dissolved Solid) | ○ | ○ | ○ | ○ | ○ |
| Seawater specific gravity | ○ | ○ | ○ | ○ | ○ |
| Temperature | ○ | ○ | ○ | ○ | ○ |
| Turbidity (LED) | — | ○ | ○ | — | — |
| Turbidity (Tangsten lamp) | — | — | — | ○ | ○ |
| Water depth | — | — | ○ | ○ | ○ |
| ORP (Oxidation Reduction Potential) | ○ | ○ | ○ | ○ | ○ |
| GPS | — | — | ○ | — |
Sensor Probe
| U-51 | U-52 | U-52G | U-53 | U-53G | |
|---|---|---|---|---|---|
| Max.items displaying simultaneously | 10 | 11 | 11 | 11 | 11 |
| Measurement temperature | -5 to 55°C | ||||
| Max. sensor diameter | Approx. 96 mm | ||||
| Probe length | Approx. 340 mm | ||||
| Cable length | Standard: 2 m, Option: 10, 30 m | ||||
| Mass | Approx. 1800 g | ||||
| Automatic calibration (use pH4) | Applying to all models | ||||
| Turbidity wiper | – | – | – | ○ | ○ |
| Measurement depth | Max. 30 m | ||||
| Material contact with liquid | PPS, glass, SUS316L, SUS304, FKM, PEEK, Titaniumu, FEP membrane, POM | ||||
| Water resistance | JIS protection livel 8 | ||||
Monitor
| U-51 | U-52 | U-52G | U-53 | U-53G | |
|---|---|---|---|---|---|
| Outer dimensions | 115(W) X 65(D) X 280(H) mm | ||||
| Mass | Approx. 800 g | ||||
| LCD | 320 X 240 Graphic liquid crystal with backlight (black and white) | ||||
| Data memory | 10000 | ||||
| Communication | USB peripheral | ||||
| Battery | C batteries X 4 | ||||
| Water resistance | JIS protection level 7 (when sensor cable is fitted) | ||||
| Battery life | U-51, U-52, U-52G: Approx. 70 hours (without backlight) U-53, U-53G: Approx. 500 measurements | ||||
| Storage temperature | -10 to 60°C | ||||
| Ambient temperature | -5 to 45°C | ||||
pH(All models in common)
- Two point calibration
- Automatic temperature
| Specification attribute | Specification value |
|---|---|
| Measurement principle | Glass electrode method |
| Range | pH 0 to 14 |
| Resolution | 0.01pH |
| Repeatability | ±0.05pH |
| Accuracy | ±0.1pH |
Dissolved Oxygen (DO, All models in common)
- Salinity conversion (0 to 70 PPT / automatic)
- Automatic temperature compensation
| Specification attribute | Specification value |
|---|---|
| Measurement principle | Polarograph method |
| Range | 0 to 50.0 mg/L |
| Resolution | 0.01 mg/L |
| Repeatability | ±0.1 mg/L |
| Accuracy | 0 to 20 mg/L: ±0.2 mg/L, 20 to 50 mg/L: ±0.5 mg/L |
Conductivity (COND, All models in common)
- Auto range
- Automatic temperature conversion (25°C)
| Specification attribute | Specification value |
|---|---|
| Measurement principle | 4 AC electrode method |
| Range | 0 to 10 S/m (0 to 100 mS/cm) |
| Resolution | 0.000 to 0.999 mS/cm: 0.001 1.00 to 9.99 mD/cm: 0.01 10.0 to 99.9 mS/cm: 0.1 0.0 to 99.9 mS/m: 0.1 0.100 to 0.999 S/m: 0.001 1.00 to 9.99 S/m: 0.01 |
| Repeatability | ±0.05% F.S. |
| Accuracy | ±1% F.S. (Median of two-point calibration) |
Salinity
| Specification attribute | Specification value |
|---|---|
| Measurement principle | Conductivity conversion |
| Range | 0 to 70 PPT (permillage) |
| Resolution | 0.1 PPt |
| Repeatability | ±1 PPT |
| Accuracy | ±3 PPT |
Total Dissolved Solid (TDS)
- Conversion factor setting
| Specification attribute | Specification value |
|---|---|
| Measurement principle | Conductivity conversion |
| Range | 0 to 100 g/L |
| Resolution | 0.1 F.S. |
| Repeatability | ±2 g/L |
| Accuracy | ±5 g/L |
Seawater specific gravity
- Display δ1, δ0, δ15
| Specification attribute | Specification value |
|---|---|
| Measurement principle | Conductivity conversion |
| Range | 0 to 50 δt |
| Resolution | 0.1 δt |
| Repeatability | ±2 δt |
| Accuracy | ±5 δt |
Temperature
| Specification attribute | Specification value |
|---|---|
| Measurement principle | Thermistor method |
| Range | -5 to 55°C |
| Resolution | 0.01°C |
| Repeatability | ±0.10°C (at calibration point) |
| Accuracy | JIS class B platinum thermometer sensor (±0.3+0.005) |
Turbidity (TURB)
| U-51 | U-52 | U-52G | U-53 | U-53G | |
|---|---|---|---|---|---|
| Measurement principle | 30°LED forward penetration and scattering method | 90°Tungsten lamp penetration and scattering method | |||
| Range | 0 to 800 NTU | 0 to 1000 NTU | |||
| Resolution | 0.1 NTU | 0.01 NTU | |||
| Repeatability | ±5% (reading) or ±0.5 NTU whichever is greater | ±3% (reading) or ±0.1 NTU whichever is greater | |||
| Accuracy | ±5% (reading) or ±1 NTU whichever is greater | 0 to 10 NTU: ±5 NTU | |||
Water depth
| U-51 | U-52 | U-52G | U-53 | U-53G | |
|---|---|---|---|---|---|
| Measurement principle | – | – | Pressure method | ||
| Range | – | – | 0 to 30 m | ||
| Resolution | – | – | 0.5 m | ||
| Repeatability | – | – | ±1% F.S. | ||
| Accuracy | – | – | ±0.3 m | ||
Oxidation Reduction Potential (ORP)
| Specification attribute | Specification value |
|---|---|
| Measurement principle | Platinum electrode method |
| Range | -2000 mV to +2000 mV |
| Resolution | 1 mV |
| Repeatability | ±5 mV |
| Accuracy | ±15 mV |
GPS 12 channel parallel (This is availalble for U-52G.)
