This product has been replaced by the Horiba U-50

---

The Horiba W-20XD Series has been replaced by the Horiba U-50 Multiparameter Water Quality Meter

---

HORIBA has designed the Horiba W-20XD Series Multi-Parameter Water Quality Meter to be extra durable with the convenience of the auto-calibration feature

---

HORIBA sensor technology development have reached their culmination

---

Horiba has designed the Horiba W-20XD Series Multi-Parameter Water Quality Meter to be extra durable with the convenience of the auto-calibration feature. Years of Horiba sensor technology development have reached their culmination in the form of a single sensor probe: a compact monitoring solution offering high pressure tolerance, long-term continuous measurement capability and highly accurate, simultaneous analysis of 13 parameters. In addition to the Water Quality Monitoring System's own capabilities, it was designed by Horiba to be compatible with GPS and PC.

Features

• Up to one month Data logging
  The sensor's built-in memory function enables continuous measurement for as long as one month*. Measurement data is stored in the probe therefore the probe only can be deployed at the site on a line.  Data can even be captured by personal computers in remote locations. Data storage capacity: 2880 sets.
  *With measurements every 15 minutes, shorter data collection frequencies exhaust the battery life faster.
• Measurement at depths to 100 meters
  With its durability and capability to operate at a high pressure , the sensor enables the user to take measurements as far as 100 meters below the water surface. In addition to rivers, lakes and other shallow bodies, high-precision measurements can be readily obtained from dams and the open sea.
• Simultaneous measurement of 13 parameters
  With the W-23XD unit (only), simultaneous measurements of up to 13 parameters to include ion measurements.  With the W-22XD, 10 parameters can be measured at one time.
• System enables GPS and PC connectivity
  System capabilities can be greatly increased by installing the Global Positioning System (GPS), supplied with unit U-2002. GPS allows measurement of location and time, in addition to water quality. With the acquired longitude, latitude and depth data, subject locations can be mapped in 3-D.

Specifications

Multi-Probe¹
Measurement temperature	0~55ºC
Storage temperature	-5~60ºC
Measurement depth ²	to 100 m
Maximum probe size	95 mm
Probe length	100% mm
Continuous use ³	30days
Data logging	○
Manual data memory (2880 items)	○
Automatic calibration	○
Conductivity: Auto range / Automatic temperature conversion (25ºC) / SI units
Measurment Principle	4 AC electrode method
Range	0~9.99 S/m
Resolution	0.1%F.S.
Repeatability	±1%
Accuracy	±3%
Salinity
Measurment Principle	Conductivity conversion
Range	0~4%
Resolution	0.01%
Repeatability	±0.1%
Accuracy	±0.3%
Total Dissolved Solids (TDS): Conversion factor setting
Measurment Principle	Conductivity conversion
Range	0~100 g/L
Resolution	0.1%F.S.
Repeatability	±2 g/L
Accuracy	±5 g/L
Seawater specific gravity: Display σt, σ0, σ15
Measurment Principle	Conductivity conversion
Range	0~50σt
Resolution	0.1σt
Repeatability	±2σt
Accuracy	±5σt
Temperature
Measurment Principle	Thermistor method
Range	0~55ºC
Resolution	0.01ºC
Repeatability	±0.3ºC
Accuracy	±1.0ºC
Turbidity: Unit selection
Measurment Principle	Penetration and scattering method
Range	0~800 NTU
Resolution	0.1 NTU
Repeatability	±3%
Accuracy	±5%
Water depth
Measurment Principle	Pressure method
Range(NTU or mg/L)	0~100m
Resolution	0.1 m
Repeatability	±3%
Accuracy	±5%
Simultaneously measurable parameters	W-22XD: 10 | W-23XD: 13

1. Organic solvents, strong acids, and strong alkaline solvents cannot be measured.
2. The maximum depth for ion measurements are 100 m for nitric acid ion, chioride ion, fluoride ion, 15 m for calcium ion, ammonia, and 3 m for potassium ion.
3. Based on the data measured automatically at 15 minutes intervals. The battery life taken into account. Periodical maintenance and calibration is necessary when a lot of shellfishes and seaweeds exist at the measurement point.

Option Specification

Control Unit
Water proof construction	IP-67
pH: Two-point calibration / Automatic temperature compensation
Measurment Principle	Glass electrode method
Range	pH 0~14
Resolution	0.01 pH
Repeatability	±0.05 pH
Accuracy	±0.1 pH
Dissolved oxygen: Salt correction (0 to 40 ppt /automatic) / Automatic temperature compensation
Measurment Principle	Diaphragm galvanic battery method
Range	0~19.99 mg/L
Resolution	0.01 mg/L
Repeatability	±0.1 mg/L
Accuracy	±0.2 mg/L
Oxidation reduction potential (ORP)
Measurment Principle	Platinum electrode method
Range	1999 mV
Resolution	1 mV
Repeatability	±5 mV
Accuracy	±15 mV

Specifications for W-23XD

Ion: Auto range
Measurment Principle	Ion electrode method
Resolution	0.1%F.S.
Repeatability	±5%
Accuracy	±10%
Range
Nitric acid ion	NO3: 0.62~62,000 mg/L(pH 3~7)
Chloride ion	Cl-: 0.4~35,000 mg/L(pH 3~11)
Calcium ion	Ca2+: 0.4~40,080 mg/L(pH 5~11)
Fluoride ion	F-: 0.02~19,000 mg/L(pH4~10:20 mg/L)
Potassium ion	K+: 0.04~39,000 mg/L(pH5~11:3.9 mg/L)
Ammonia	NH3: 0.1~1,000 mg/L(pH 12 or more)

• The accuracy rating value is obtained from measurements at an intermediate point of the standard solution after two-point calibration (at room temperature and pressure). The repeatability and accuracy rating percentages are based on the full scale (except for salinity).

Downloads

Horiba W-20XD Series Multi-Parameter Water Quality Meters - Data Sheet

Horiba W-20XD Series Multi-Parameter Water Quality Meters -Software Manual