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W-21SDI Water Quality Monitoring System

Continuous simultaneous analysis of 8 water quality parameters
with extensive data logging capabilities FITS in 2" Well

water quality monitoring system

Features of the W21SDI & W22XD
Water Quality Monitors

Submersible down to 100 m
ISCO ready Sonde for SDI
Multi Probes for simultaneous measurement
pH
DO
Conductivity, Salinity, TDS
Seawater s.g
Temperature
ORP, ions
Remarkable compact size in heavy duty steel cover
Data Logging
GPS option
One touch Multi-Parameter calibration
Detachable cables
CE Mark
Turbity (W22XD)
Depth (W22XD)

Water Quality Measurement
The Horiba water quality measurement system comprises a battery powered meter control unit with a submersible probe. The is supplied with different sensors and cable lengths to match your requirements. There are are several versions of the probe system depending on the number of sensors mounted in the probe. The products on this page all fit into 2 inch bore wells. The W-21SDI measures 8 key parameters and is SDI compatible. (The W22XD includes turbidity and depth but is not SDI compatible.)

Up to one month Data logging
Simply leave the probe submerged in the sample and the sensor's built-in memory function enables continuous measurement for up to one month. Personnel do not need to be present during the measurement process. Data can even be retrieved by personal computers in remote locations.

Simultaneous measurement of 8 parameters
With the W-21SDI unit simultaneous measurements of 8 parameters (from pH, dissolved oxygen, and conductivity, salinity, TDS, ORP, seawater specific gravity and temperature can be obtained — much more quickly and easily than with conventional instruments. With its powerful measurement capabilities, the compact W-21SDI is ideal for well logging and is recommended for all water quality researchers and professionals.

Measurement at depths as low as 100 meters
With its superior durability and high pressure resistance, the newly developed sensor facilitates measurements as far as 100 meters below the water surface. Thus, in addition to rivers, lakes and other shallow bodies, high-precision measurement can now be readily obtained — and water quality can be monitored — at dams, and even in the open sea.

System enables GPS various other data processing mechanisms
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, and enables main unit screen display of the obtained data — an indispensable function for maintaining detailed records. With the acquired longitude, latitude and depth data, subject locations can be mapped in 3-D.

Specifications and Configuration

Control Unit	Rating	IP67	W21SDI	W22XD
Multiprobe	Measurement temperature	0-55 °C
	Storage Temperature	-5 to~+60 °C
	measurement Depth	up to 100m (60m SDI)
	Probe size max diam	46 mm
	Probe length	380 mm
	Continuous use	30 days
	Data Logging	yes
	Automatic Calibration	yes
pH 2 pt calibration ATC	Principle	Glass Electrode
	Range	0-14 pH
	Resolution	0.01 pH
	Repeatability	±0.05pH
	Accuracy	±0.01 pH
Dissolved Oxygen Salt Correction (0-40 ppt) ATC	Principle	Galvanic
	Range	0-19.99 mg/L
	Resolution	0.01 mg/L
	Repeatability	±0.1 mg/L
	Accuracy	±0.2 mg/L
Conductivity Auto range ATC (25°C)	Principle	4 electrode
	Range	0-9.99 S/m
	Resolution	0.1% FS
	Repeatability	±1%
	Accuracy	±3%
Salinity	Principle	conversion
	Range	0-4%
	Resolution	0.01%
	Repeatability	±0.1%
	Accuracy	±0.3%
TDS Calculated from conductivity	Principle	conversion
	Range	0-100 g/L
	Resolution	0.1% FS
	Repeatability	±3 g/L
	Accuracy	±5 g/L
Seawater Specific Gravity	Principle	conversion
	Range	0-50
	Resolution	0.1
	Repeatability	±2
	Accuracy	±5
Temperature	Principle	Thermistor
	Range	0-55 °C
	Resolution	0.01 °C
	Repeatability	±0.3 °C
	Accuracy	±1.0 °C
ORP	Principle	Platinum Electrode
	Range	±1999 mV
	Resolution	1mV
	Repeatability	±5mV
	Accuracy	±15mV
Turbidity	Principle	Trans/Scattering
	Range	0-800 NTU
	Resolution	0.1 NTU
	Repeatability	±3%
	Accuracy	±5%
Water Depth	Principle	Pressure
	Range	0-100 m
	Resolution	0.1 m
	Repeatability	±3%
	Accuracy	±5%

Ordering Information

Model	Description	Price
HA-W21SDISet	pH, DO, Conductivity Salinity TDS. Seawater SG, temp, ORP and data logging Main Unit, sensor probe, pH 4 buffer, fill, beaker, syringe, wrench, case, batteries and manual. (Probe diameter 47 mm)	call
HA-W22XDSet	As above but including turbidity and depth (not SDI compatible)
HA-WC2	2 meter detachable cable
HA-WC10	10 meter detachable cable
HA-WC30	30 meter detachable cable
HA-WC50	50 meter detachable cable
HA-WC100	100 meter detachable cable
HA-U22XD-30	As above 30 meter cable

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