Large selection of sensors for four-beam pulsed light systems
Large two line LC display for set-up and measured value display
Large additional LED display for separate measured value display
Large concentration range from 2 FNU ot 150g/l
Measuring units : g/l, mg/l, TEF, ppm, %
Menu-controlled set-up and calibration in plain text
Five relay outputs ( sensor cleaning, error message, two freely configurable limit contacts, Hold )
Battery-powered measured value storage
One or two channel versions

Model 7110-MTF
The Model 7110 is a continuous on line transmitter that measures suspended solids content or turbidity. Depending on
the sensor model selected, the measurement is displayed in mg/l, ppm, g/l, % or NTU. The principle of measurement is
a patented light absorption method or scattered light technique. Two monochromatic LED's are pulsed at a frequency of
several kilohertz. The signals from the two photo detectors are separately converted into logarithmic functions and analyzed
relative to each other. This reliable field proven measurement technique compensates for sensor fouling and aging of the
optical components.
Model 7110-MTF Suspended Solids / Turbidity Transmitter
Range Selection NTU, g/l, mg/l, ppm, %
Measuring Range See sensor Specifications
Power Supply 115 Vac, 50/60 Hz or 24Vac/dc
Power Consumption 20 VA
Accuracy 1.0%
Repeatability 0.5%
Output Isolated 0-20 mA or 4-20 mA
Max Load 500 Ohms
Alarms 2 Input contacts,
1 sensor cleaning contact,
1 diagnostic contact.
Contact Rating 230 Vac, 3.0 A
Operating Temperature -20° to 60°C (-4° to 140°F)
Enclosure Rating IP65 (NEMA 4X)
Weight 1.6kg (3.5 lbs.)
General Sensor Specifications
Measurement Principle Four beam pulsed infrared light
Wave Length 880-920 nm
Light Source Infrared LED's
Sample Temperature 0-50°C (32-122°F)
Sample Pressure 6 bar (87 psi)
Insertion Sensor Cable Length 0.8m (2.5 ft.), includes 10m (32.8 ft.) extension cable
Submersion Sensor Cable Length 13.0m (42.5 ft.)
Maximum Distance Sensor to Transmitter 200m (656 ft.)
Materials of Construction 316 SS/POM/Epoxy
Applications
• Primary and Secondary Clarifiers
• Return and Waste Activated Sludge Concentration
• Mixed Liquor
• Centrifuge Effluent Concentration
• Aeration Basins
• Final Effluent