Meter for Monitoring up to eleven different water quality parameters
Multiparameter water quality meter FEATURES:
  • Rugged
  • Fully submersible sensor
  • Measure and display up to 11 items simultaneously
  • Ideal for multi-parameter water quality measurements without having a permanent installation
Multiparameter Water Quality Meter Product Description
Multiparameter Water Quality Meter


Multiparameter Water Quality Meter


The U-50 multiparameter water quality meter brings laboratory accuracy and the ease of push-button operation to water quality measurement in the field.  Eleven parameters can be measured: pH, pH(mV), ORP, temperature, dissolved oxygen, electrolytic conductivity, turbidity, total dissolved solids, salinity, seawater specific gravity, and depth.  Featuring a powerful sensor probe and state-of-the-art functions, the multiparameter water quality meter makes it easy to get highly reliable water quality data simply and quickly just by submersing the sensor in the water.  The multiparameter water quality meter's control unit has a waterproof design that allows you to work without concern of splashing or accidentally dropping the instrument in the water.  The multiparemeter water quality meter is flexible enough to use for checking the quality of a broad range of water samples, from factory effluent to urban drainage, river water, lake and marsh water, aquatic culture tanks, agricultural water supplies, and sea water.  NOTE: Seawater or high salinity water may errode metallic parts.  After use, promptly wash the sensor probe thoroughly with tap water.


Water Quality Meter Control Unit
The U-50 multiparameter water quality meters control unit allows for convenient operation with one hand.  The easy to read LCD screen can display all 11 measurement parameters as the same time.  You can change the text size on the multiparameter water quality meters for easier reading.  The multiparameter water quality meters have a patented auto-calibration feature that provides hassle free calibration.  The multiparameter water quality meter's shock resistant cover was designed for rough treatment in the field and easy cleaning.  The U-50 allows the cable to be quickly connected and disconnected to the multiparameter water quality meter's control unit.  The backlit display allows you to even take multiparameter water quality measurements in the dark.


Water Quality Meter Sensor Probe
The U-50 multiparameter water quality meters have a rugged sensor housing that contain five sensors which provide eleven different parameter measurements.  The turbidity sensor precision has been improved over conventional instruments and the U-53 multiparameter water quality meter has a high precision field replaceable turbidity sensor with wiper.  The dissolved oxygen sensor has improved stability with the multiparameter water quality meters using a new three electrode design for fast response and polarographic sensor for ease of maintenance.  The U-50 multiparameter water quality meters have individually replaceable pH and ORP electrodes to reduce replacement costs.


Limited Data Logger
The U-50 multiparameter water quality meters can store up to 10000 data sets in memory.  Data can be stored manually or automatically for later display and print out from the multiparameter water quality meter.  There is no need to manually record measured values on site with the U-50 multiparameter water quality meter.  Once the multiparameter water quality meter has recorded data you can recall data for a specific site, a specified date/time, or all of the data depending on your needs.  You can check the multiparameter water quality meter's data capacity at any time by using the data memory check feature.  With the optional USB cable the multiparameter water quality meter's data can be transferred to a computer for further analysis.


The standard handheld multi-parameter water quality measurment system comes with:

  • Handheld multiparameter water quality meter with water quality probe and cable
  • Instruction manual
  • 500 ml pH 4 Buffer
  • 250 ml Reference inner solution
  • Calibration beaker
  • DO installation tool and membrane repair kit
  • pH, DO, and ORP sensors
  • Backpack
Multiparameter Water Quality Meter Specifications
Parameters U-51 U-52 U-53
Sensor Probe Measurement temp 23 to 131 F (-5 to 55 C)
Max Sensor Diameter Approx. 3.75 in (96mm)
Probe length Approx. 13.39 in (340 mm)
Cable length Standard: 6.56 ft (2m), option: 32.8, 98.4 ft (10, 30m)
Weight Approx. 3.97 lbs. (1.8 kg)
Automatic calibration (uses pH4) Yes
Turbidity wiper No Yes
Measurement depth 98.43 ft (30 m) Max.
Material PPS, glass, SUS316L, SUS304, FKM, PEEK, Q, titanium, FEP membrane, POM
Water resistance IP 68, JIS protection level 8
Control Unit Display Simultaneous display of 10 parameters Simultaneous display of 11 parameters
LCD 320x240 liquid crystal with backlight (black and white)
Outer dimensions 4.52x2.6x11.14 in (115x66x283 mm) WxDxH
Weight Approx. 1.76 lbs (800 g)
Data memory 10,000 data sets
Communication USB
Battery C batteries x4
Battery life Approx. 70 hrs (without backlight) Approx. 500 measurements
Water resistance IP 67, JIS protection level 7 (when sensor cable is attached)
Storage temperature 14 to 140 F (-10 to 60 C)
Ambient temperature 23 to 113 F (-5 to 45 C)

* Two-point calibration
* Automatic temperature compensation

Measurement principle Glass electrode
Range 0 to 14 pH
Resolution 0.01 pH
Repeatability + 0.05 pH
Accuracy + 0.1 pH
Oxidation Reduction Potential (ORP) Measurement principle Platinum electrode
Range -2000 to 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
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 C)

Measurement principle 4 AC electrode
Range 0 to 10S/m (0 to 100 mS/cm)
Resolution 0.000 to 0.999 mS/cm: 0.001
1.00 to 9.99 mS/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 mS/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 Measurement principle Conductivity conversion
Range 0 to 70 PPT
Resolution 0.1 PPT
Repeatability + 1 PPT
Accuracy + 3 PPT
Total Dissolved Solids (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,σo,σ15

Measurement principle Conductivity conversion
Range 0 to 50 σt
Resolution 0.1 σt
Repeatability +2 σt
Accuracy + 5 σt
Temperature Measurement principle Thermistor
Range 23 to 131 F (-5 to 55 C)
Resolution 0.02F (0.01C)
Repeatability *+ 0.18F (+ 0.10C) (at calibration point)
Accuracy JIS class B platinum thermometer sensor (+ 0.3+0.005 |t|)
Turbidity (TURB) Measurement principle N/A LED light source and 30 scattering Tungsten lamp source and 90 scattering
Range N/A 0 to 800 NTU 0 to 1000 NTU
Resolution N/A 0.1 NTU 0.01 NTU
Repeatability N/A *+ 5% (Reading) or + 0.5 NTU whichever is greater + 3% (Reading) or + 0.1 NTU whichever is greater
Accuracy N/A + 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 N/A Pressure
Range N/A 0 to 30 m
Resolution N/A 0.5 m
Repeatability N/A + 1% F.S.
Accuracy N/A + 0.3 m
* Battery life based on continuous operation using alkaline C dry batteries when the monitor temperature is over 20C 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 25C normal pressure condition).
Multiparameter Water Quality Meter Options
U-51-2 Multiparameter Water Quality Meter (PN# DIDA02)
Probe includes 6.5 ft (2 m) cable.
U-51-10 Multiparameter Water Quality Meter (PN# DIDA10)
Probe includes 32.8 ft (10 m) cable.
U-52-2 Multiparameter Water Quality Meter (PN# DIDB02)
Probe includes 6.5 ft (2 m) cable.
U-52-10 Multiparameter Water Quality Meter (PN# DIDB10)
Probe includes 32.8 ft (10 m) cable.
U-52-30 Multiparameter Water Quality Meter (PN# DIDB30)
Probe includes 98.4 ft (30 m) cable.
U-53-2 Multiparameter Water Quality Meter (PN# DIDC02)
Probe includes 6.5 ft (2 m) cable.
U-53-10 Multiparameter Water Quality Meter (PN# DIDC10)
Probe includes 32.8 (10 m) cable.
U-53-30 Multiparameter Water Quality Meter (PN# DIDC30)
Probe includes 98.4 ft (30 m) cable.
529244 Hard carrying case with foam insert (PN# DID180)
KU-20-2 USB cable and software (PN# DID190)
Flow Chamber/cell (PN# DID200)
7112 pH sensor (PN# DID110)
7313 ORP sensor (PN# DID140)
7543 DO sensor (PN# DID150)
7210 Reference sensor (PN# DID130)
7800 U-52 Turbidity sensor (PN# DID160)
7801 U-53 Turbidity sensor (PN# DID170)
3F30-110 Multi 1970i Portable Multi-parameter Meter
Multiparameter meter with universal AC power supply.  Probes not included.
2F30-104B22 Multi 3400i Kit Multi-parameter Meter
Includes Multi 3400i, SenTix 41-3 pH electrode, CellOx 325-3 oxygen electrode, TetraCon 325-3 conductivity sensor, technical buffers 4 and 7, 3 M KCl, cleaning solution, 3 exch. membr. heads, electrolyte, abrasive foil, cond standard (1413 S/cm)  All sensors have 9.8 ft (3 m) of cable.
2FD451 Multi 3410 Set 1 Single Channel Digital Multiparameter Meter
Includes Multi 3410, SenTix 940 pH IDS sensor, QSC kit, PC comm. pkg, case & accessories.  Sensor has 5 ft (1.5 m) of cable.
2F40-114B0E Multi 3500i Kit Handheld Multiparameter Meter
Includes Multi 3500i, SenTix 41-3 pH electrode, ConOx-3 conductivity/oxygen electrode, PC comm. pkg, case & acc..  All sensors have 9.8 ft (3 m) of cable.
W-22XD-2 Multiparameter Probe
Use the multiparameter probe to monitor 10 different parameters, including total suspended solids, water depth, and ORP.
W-23XD-2 Water Quality Sonde
Water quality instrumentation for simultaneously measuring up to 13 different parameters.
WQMS Water Quality Monitoring System
The standard unit includes a datalogger, temperature sensor, pH sensor, conductivity sensor (with a 0-5000S range unless otherwise specified), and DO sensor.
Water quality sensors for permanent installation.

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