U-50 Multi-parameter water quality checker

Various sensors have been consolidated into a single probe

Simultaneous measurement and display of up to 11 parameters are possible. The sensors can be individually replaced.
However, only one type of standard solution is required.

Can be easily operated by anybody

Equipped with a one-touch automatic calibration function. The cable connection is an easy-to-attach/detach one-touch type. The data is conveniently displayed in real-time through the Auto-Hold function, allowing for easy visual monitoring during measurements. Furthermore, it is equipped with a diagnostic function that indicates the replacement timing of each sensor and displays errors.

Easy and convenient data management function

Easy computer integration is possible with USB connectivity.

The LCD display makes it easy to read and operate

The data is displayed clearly on the LCD screen for easy viewing. Possible to operate easily with one hand. Various functions are displayed with easily recognizable icons.

Convenient for field measurements

Designed for field measurements, it having been enhanced with impact resistance using soft resin materials. Also equipped with a convenient carrying bag as a standard accessory.

The turbidity sensor (U-53) is compliant with EPA Method 180.1

The U-53 incorporates a turbidity sensor that is compliant with EPA Method 180.1. Equipped with a wiper.

		U-51	U-52	U-52G	U-53	U-53G
Sensor Probe	Measurement temperature	−10 to 55℃
	Maximum sensor diameter	Approx. 96 mm
	Probe length	Approx. 340 mm
	Cable length	Standard: 2 m, option: 10, 30 m
	Mass	Approx. 1,800 g (Approx. 3.97 lbs)
	Automatic calibration (uses pH4)	●
	Turbidity wiper	—	—	—	●	●
	Measurement depth	Max. 30 m
	Liquid contact part material (liquid end material)	PPS, glass, SUS316L, SUS304, FKM, PEEK,Q, titanium, FEP membrane, POM
	Water resistance	JIS protection level 8
Control Unit	Outer dimensions	115 (W) × 66 (D) × 283 (H) mm
	Mass	Approx. 800 g (approx. 1.76 lb)
	LCD	320 × 240 liquid crystal display; backlit, black and white
	Data memory	10,000
	Communication	USB
	Battery	C batteries x 4
	Water resistance	JIS protection level 7 (when sensor cable is fitted)
	Battery Life	Approx. 70 hours (without backlight)			Approx. 500 measurements
	Storage temperature	−10 to 60℃
	Ambient temperature	−5 to 45℃
pH ●Two-point calibration ●Automatic temperature	Measurement principle	Glass electrode method
	Range	pH0 to 14
	Resolution	0.01 pH
	Repeatability	±0.05 pH
	Accuracy	±0.1 pH
Oxidation Reduction Potential (ORP)	Measurement principle	Platinum electrode method
	Range	−2000 mV～＋2000 mV
	Resolution	1 mV
	Repeatability	±5 mV
	Accuracy	±15 mV
Dissolved Oxygen (DO) ●Salinity conversion (0 to 70 PPT/automatic) ●Automatic temperature compensation	Measurement principle	Polarographic 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) ●Auto range ●Automatic temperature conversion (25℃)	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 mS/cm 1.00 to 9.99 mS/cm: 0.01 mS/cm 10.0 to 99.9 mS/cm: 0.1 mS/cm
	Repeatability	0.0 to 99.9 mS/m: 0.1 mS/m 0.100 to 0.999 S/m: 0.001 S/m 1.00 to 9.99 S/m : 0.01 S/m
	Accuracy	*±1% F.S. (Median of two-point calibration)
Salinity	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	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 σt, σ0, σ15	Measurement principle	Conductivity conversion
	Range	0 to 50σt
	Resolution	0.1 σt
	Repeatability	±2 σt
	Accuracy	±5 σt
Temperature	Measurement principle	Thermistor method
	Range	−10 to 55℃
	Resolution	0.01 ℃
	Repeatability	*±0.10℃ (at calibration point)
	Accuracy	JIS class B platinum thermometer sensor (±0.3+0.005 \| t \|)
Turbidity (TURB)	Measurement principle	—	LED light source and 30°scattering method		Tungsten lamp source and 90°scattering method
	Range		0 to 800 NTU		0 to 1000 NTU
	Resolution		0 to 99.9 NTU: 0.1 NTU 100 to 800 NTU: 1 NTU		0 to 9.99 NTU: 0.01 NTU 10 to 99.9 NTU: 0.1 NTU 100 to 1000 NTU: 1 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: ±0.5 NTU 10 to 1000 NTU: 3% (Reading) or ±1 NTU whichever is greater
Water depth	Measurement principle	—	—	Pressure method
	Range			0 to 30 m
	Resolution			0.05 m
	Repeatability			±1 % F.S.
	Accuracy			±0.3 m
GPS	12 channel parallel	—	—	●	—	●

Note:
* Battery life based on continuous operation using alkaline C dry batteries when the monitor temperature is over 20℃ and the backlight OFF.
* Accuracy is measured by calibrating 4 points for turbidity and electrical conductivity and 2 points for all other measurements against standard solution.
* Repeatability is measured by the ability to reproduce the results against the standard solution (at 25℃ normal pressure condition).

U-50

Multi-parameter water quality checker

The ability to simultaneously measure and display up to 11 parameters using a single device.

*Optional features

Data Collection Software

Various sensors have been consolidated into a single probe

Can be easily operated by anybody

Easy and convenient data management function

The LCD display makes it easy to read and operate

Convenient for field measurements

The turbidity sensor (U-53) is compliant with EPA Method 180.1

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