A Product by Horiba
OverviewSpecificationsResources

U-50 series Multi-parameter water quality checker enables to measure and indicate the monitoring result simultaneously up to 11 parameters with one unit. Tough & powerful design,considering user friendly field monitoring on site, such as rive, ground water, drainage water, etc.


Flexible and powerful Features of U-50 Multiparameter Water Quality Checker


  • Multiple sensors allow for the measurement of 11 paramenters simultaneously. (pH, pH (mV), ORP, DO, COND, Salinity, TDS, Seawater, Specific Gravity, Temperature, Turbidity, Water depth)
  • Turbidity sensor U-53 conforms to US EPA method 180.1 Precision has been improved over conventional instruments. The Model U-53 high precision field replaceable sensor with wiper has aresolution of 0.01 NTU.
  • Turbidity sensor of U-54 conforms to EN ISO 7027. The model U-54 has a resolution of 0.01 NTU.
  • Improved stability of the dissolved oxygen sensor has been achieved with a new 3 electrode design for fast response and polarographic sensor for ease of maintenance.
  • pH and ORP electrodes can be replaced individually to reduce replacement costs.

U-50 series Feature comparison

U-51

U-52

U-52G

U-53

U-53G

U-54

U-54G

pH

DissolvedOxygen

Conductivity

Salinity

TDS(Total Dissolved Solid)

Seawater specific gravity

Temperature

Turbidity (LED)

Turbidity (Tangsten lamp)

Water depth

○*

○*

ORP (Oxidation Reduction Potential)

GPS

Note: *U-54/G(2m) don't have the feature of water depth.

Sensor Probe

Approx. 340mm

U-
51

U-
52

U-
52G

U-
53

U-
53G

U-54

U-54G

Max.items displaying simultaneously

10

11

11

11

11

11

11

Measurement temperature

-10to 55°C

Max. sensor diameter

Approx. 96mm

Probe length

Cable length

Standard: 2m, Option: 10m,30m

Mass

Approx. 1800g
(Approx. 3.97 Ibs)

Automatic calibration
(usepH4)

Applying to all models

Turbidity wiper

Measurement depth

Max. 30m

Material contact with liquid

PPS, glass, SUS316L, SUS304, FKM, PEEK, Q,Titaniumu,
FEP membrane,POM

Water resistance

JIS protection livel 8

Monitor

U-51

U-52

U-52G

U-53

U-53G

U-
54

U-
54G

Outer dimensions

115(W) X 66(D) X 283(H) mm

Mass

Approx.800 g
(Approx. 1.76 Ibs)

LCD

320 X 240 liquid crystal display with backlight (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

U-51, U-52, U-52G:
Approx. 70hours
(without backlight)

U-53, U-53G:
Approx.500 measurements

Approx. 70 hours (without backlight)

Approx. 70 hours (withoutbacklight)

Storage temperature

-10 to 60°C

Ambient temperature

-5 to45°C

pH(All models in common)

  • Two-point calibration
  • Automatic temperature

Specification attribute

Specification value

Measurement principle

Glass electrodemethod

Range

pH 0 to 14

Resolution

0.01pH

Repeatability

±0.05pH

Accuracy

±0.1pH

Oxidation Reduction Potential (ORP)

Specification attribute

Specification value

Measurement principle

Platinum electrodemethod

Range

-2000 mV to +2000 mV

Resolution

1 mV

Repeatability

±5mV

Accuracy

±15 mV

Dissolved Oxygen (DO, All models in common)

  • Salinity conversion (0 to 70 PPT /automatic)
  • Automatic temperature compensation

Specification attribute

Specificationvalue

Measurement principle

Polarographic method

Range

0 to 50.0mg/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 ACelectrode 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 9.99mS/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

Conductivityconversion

Range

0 to 70 PPT (permillage)

Resolution

0.1PPt

Repeatability

±1 PPT

Accuracy

±3 PPT

Total Dissolved Solid (TDS)

  • Conversion factor setting

Specification attribute

Specification value

Measurementprinciple

Conductivity conversion

Range

0 to 100 g/L

Resolution

0.1%F.S.

Repeatability

±2 g/L

Accuracy

±5 g/L

Seawater specificgravity

  • Display δ1, δ0, δ15

Specification attribute

Specification value

Measurementprinciple

Conductivity conversion

Range

0 to 50 δt

Resolution

0.1δt

Repeatability

±2 δt

Accuracy

±5 δt

Temperature

Specification attribute

Specification value

Measurement principle

Thermistormethod

Range

-10 to 55°C

Resolution

0.01°C

Repeatability

*±0.10°C (atcalibration point)

Accuracy

JIS class B platinum thermometer sensor (±0.3+0.005 |t|)

Turbidity (TURB)

U-51

U-52

U-52G

U-53

U-53G

U-
54

U-
54G

Measurement principle

LED
light
source
and
30°scattering
method

Tungsten lamp
source
and
90°scattering
method

LED
light
source
and
90°scattering
method

LED
light
source
and
90°scattering
method

Range

0 to 800 NTU

0 to 1000NTU

0 to 1000 NTU
0 to 0.99: 0.01 NTU
1 to 99.9:
0.1 NTU

0 to 1000 NTU
0 to 0.99: 0.01 NTU
1 to 99.9:
0.1NTU

Resolution

0 to 99.9 NTU: 0.1,
100 to 800 NTU: 1

0 to 9.99 NTU: 0.01,
10 to99.9 NTU: 0.1,
100 to 1000 NTU: 1,

0 to 0.99 NTU: 0.01,
1 to 99.9 NTU: 0.1,
100 to 1000 NTU: 1

0 to 0.99 NTU: 0.01,
1 to 99.9 NTU:0.1,
100 to 1000 NTU: 1

Repeatability

*±5% (reading) or ±0.5 NTU whichever is greater

±3%(reading) or ±0.1 NTU whichever is greater

±5% (reading) or ±0.5 NTU whichever is greater

±5% (reading) or ±0.5 NTU whichever isgreater

Accuracy

±5% (reading) or ±1 NTU whichever is greater

0 to 10 NTU: ±0.5
10 to1000 NTU: 3% (reading) or ±1 NTU whichever is greater

±5% (reading) or ±1 NTU whichever is greater

±5% (reading) or ±1 NTU whichever isgreater

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