Water Quality Monitor

Provides these measurements . . .

	temperature		depth		salinity
	dissolved oxygen		chlorophyll fluorescence		turbidity

. . . from a single instrument.

Accurate data, unattended
WET Labs and Sea-Bird Electronics have teamed to bring offshore research-grade measurement technology to inshore and estuarine research and ocean observing applications.

The WQM's sensors have the accuracy and precision to track subtle long-term changes in clean ocean environments. By combining multiple active and passive anti-fouling features, the WQM assures this data quality in coastal and inshore regimes. Extensively tested, field trials have demonstrated the WQM's unprecedented long-term stability in biologically rich coastal waters

Built for extended deployment
Biofouling and sediment loads are the dominant factors that degrade and limit the data quality from the WQM's sensors, not their inherent stability. These factors can overwhelm inadequately protected sensors and invalidate their data—often in just a few days. The WQM employs active flow control, passive flow prevention, light-blocking, active biocide injection and passive inhibitors to effectively and safely combat internal and external fouling. With fouling minimized, the superior inherent stability of the WQM sensors translates directly to superior long-term data quality.

Cost effective—now and later
The cost of monitoring is tied to the instrument life cycle and real value is ultimately provided only through quality data, day after day, month after month, year after year. The WQM provides quality data while dramatically reducing the need for field and factory service. The bottom line: the WQM delivers unequalled long-term data quality and minimizes operational and maintenance costs.

Anti-fouling features

Pump-controlled flow	Light-blocked sample chambers
Extensive copper cladding	Bio-wiper protects optical components
BLeach injection system (BLIS) protects DO sensor and CTD flow path
Anti-Foulant (AF) collar for conductivity cell (EPA approved)

Specifications

Mechanical

Electrical

Input voltage	12–18 VDC	Dimensions	65.4 x 18.5 cm
Current draw	275 mA typical sleep: <100 µA	Housing	Acetal copolymer, titanium, copper
Output	RS-232	Weight in air	5.4 kg
Connector	MCBH-6-MP	Weight in water	1.8 kg
Sample rate	1Hz	Depth rating^a	200 m

	Measurement
	Range	Accuracy	Precision	Units	Wavelength
Conductivity	0–9	0.003 mS/cm	0.001	S/m
Temperature	-5–35	0.002	0.001	Deg C
Depth	0–100, -200	0.1% FS	0.01% FS	dbar
Dissolved Oxygen	0–120%^b	0.1^c	0.02	mg/l
Fluorescence	0–50^d	0.2% FS^e	0.04% FS	µg/l	EX: 470 EM: 695
Turbidity	0–25^d	0.1	0.04% FS	NTU	700

A. Depth rating is the lesser of 200 m or the pressure sensor rating.
B. Oxygen range is relative to surface saturation.
C. +/- 0.2 mg/l or 2% of reading, whichever is greater.
D. Available measurement ranges:
0–30 µg chl/l, 0–10 NTU
0–50 µg chl/l, 0–25 NTU
0–125µg chl/l, 0–1000 NTU
E. Chlorophyll fluorescence is created by living organisms and is subject to taxonomical and physiological changes. Field calibration is highly recommended. Seeuser's guide for standard protocols.

Sales and support
WET Labs warranties the WQM for 1 year (parts and labor). A five-year warranty-service plan is available. Contact us at 541-929-5650, or sales@wetlabs.com.

Hardware User's Guide | WQM Spec Sheet | Software User's Guide | Software (zipped file)