Rosemount Analytical WQS Specifications
• COMPLETE SYSTEM INCLUDES sensors, cable,
and instruments.
• MEASURES pH, ORP, Conductivity, Temperature,
Free Chlorine, Monochloramine, Dissolved Oxygen,
and Turbidity.
• VARIOPOL QUICK-DISCONNECT FITTINGS make
replacing sensors easy.
• MULTIPLE INSTRUMENT PLATFORM CHOICES.
• FEATURE-PACKED INSTRUMENTS: dual outputs,
three fully-programmable alarm relays, two-line display,
HART
®
or FOUNDATION fieldbus®digital communications.
FEATURES
The Model WQS water quality system is intended for
the determination of pH, ORP, conductivity, temperature, free chlorine or monochloramine, oxygen, turbidity,
and particle index in fresh water. The system combines user-specified instruments and sensors to create
a customized system for monitoring water quality.
Unlike systems from other manufacturers, the Model
WQS does not use expensive sample conditioning
systems or messy reagents.
Model WQS systems require less than 3 gph (183
mL/min) sample flow. There is little waste, which is
important in areas where water is scarce or a sewer is
not available.
Designed for quick startup and low maintenance
• No reagents — free chlorine and monochloramine
sensors are completely reagent-free
• Variopol quick disconnect sensors
• Prewired and plumbed
• Low sample flow; <3gph (183 mL/min)
Model WQS
Multi-Parameter Electrochemical /
Optical Water Quality System
Product Data Sheet
PDS 71-WQS/rev.H
September 2011
Multiple Instrument choices
• Analog outputs
• Digital outputs: HART, Foundation fieldbus
• 115/230VAC powered
• 24VDC loop powered
• Alarms/relay contacts
Ideal for continuous monitoring of water distribution systems:
• Provides constant surveillance of water quality
events that may affect the security of your distribution
network.
• Helps ensure acceptable water quality parameters
are maintained though out the distribution system.
• Assists in meeting the requirements of the Surface
Water Treatment Rule
®
FOUNDATION is a registered trademark of Fieldbus Foundation.
®
HART is a registered trademark of the HART Communication Foundation.
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APPLICATIONS
Rosemount Analytical recognizes that a “one size fits all” approach to water quality monitoring
does not provide the most efficient or economical solution to your needs. That is why
Rosemount Analytical offers a flexible approach that lets you choose the analyzers you want to
make the measurements you need. We offer platforms that range from basic analog output
instruments to transmitters with digital outputs powered by solar energy. Through our Emerson
Process Solutions Group we can provide wireless solutions and control systems that allow you
to look at each parameter from a central location.
ELECTROCHEMICAL MEASUREMENTS AVAILABLE
• pH
• ORP
• Conductivity
• Free Chlorine
• Monochloramine
• Dissolved Oxygen
OPTICAL MEASUREMENTS AVAILABLE
• Turbidity
WATER QUALITY FLOW SYSTEM SPECIFICATIONS
Sample Inlet: 1/4 inch OD tubing compression fitting or 1/4 FNPT
Sample Flow: minimum 2.2 gal/hr (134 mL/min)
maximum 5.0 gal/hr (305 mL/min)
Input Pressure: 5 psig (1.6 kPa) to 1,000 psig (7900 kPa)
Sample Temperature: 32 to 122°F (0 to 50°)
Wetted Materials: Polypropylene, acrylic, CPVC, brass, 316 stainless steel
SENSOR SPECIFICATIONS — pH/ORP
Model Number pH: 3900VP-02-10
Model Number ORP: 3900VP-02-12
Measured Range: pH: ACCUGLASS 0-14;
ORP: -1400 to +1400 mV
Temperature Compensation: pH: Automatic 32° to 185°F (0° to 85°C);
ORP: Temperature compensation is not required.
SENSOR SPECIFICATIONS — CONDUCTIVITY
Model Number: 400VP-13
Wetted Materials: Titanium, 316 SST, PEEK, EPDM
Cell Constants: 0.1/cm, 1.0/cm
Linear Range:
When used with 54e platform: 2 - 20,000 μS/cm at 25°C
When used with 1055 platform: 20 - 2,000 μS/cm 25°C
When used with Xmt platform: 10 - 20,000 μS/cm 25°C
SENSOR SPECIFICATIONS — FREE CHLORINE
Model Number: 499ACL-01-54-VP
Linear Range: 0 to 10 ppm (mg/L) as Cl2.
Cathode: platinum (normally wetted)
Accuracy: Accuracy depends on the accuracy of the chemical test used to calibrate the sensor.
pH Range: Continuous pH correction defined between 6.0 and 9.5.
Minimum Sample Conductivity: 50 µS/cm
Response Time: 22 sec to 95% of final reading at 25°C
Electrolyte Volume: 25 mL (approx.)
Electrolyte Life: 3 months (approx.)
Rosemount Analytical 3
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SENSOR SPECIFICATIONS — MONOCHLORAMINE
Linear Range: 0 - 15 ppm (mg/L)
Cathode: gold mesh
Accuracy: Accuracy depends on the accuracy of the laboratory method used to calibrate the sensor.
Linearity: 2% (typ.)
pH range: Response is practically independent of pH between pH 7.0 and 10.0. Sensor current at pH 10.0 is within
5% of sensor current at pH 7.0.
Sample Conductivity: >10 µS/cm at 25°C
Response time: <30 sec to 90% of final reading (0 to 2 ppm) at 25°C.
Drift: <2% of reading per week
Electrolyte Volume: 25 mL (approx.)
Electrolyte Life: 3 months (approx.)
SENSOR SPECIFICATIONS — DISSOLVED OXYGEN
Range: 0 to 20 ppm (mg/L) as O2.
Cathode: gold (not normally wetted)
Accuracy: ±0.2 ppm at 25°C
Repeatability: ±0.05 ppm at 25°C
Response time: 25 sec to 63% of final reading at 25°C
Electrolyte Volume: 25 mL (approx.)
Electrolyte Life: 4 to 6 months (approx.)
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