Real Time Wastewater Monitor
The SENTRY bio-electrode sensor measures the rate of carbon consumption
Real-time WWTP influent monitoring
Optimise WWTP performance and saves energy
Identifies system imbalance and toxic shock events
Real-time data about the concentration of organic matter
Water and Wastewater Real-Time Monitoring
SENTRY is a unique bio-electrode sensor measuring the rate of carbon consumption of the biology in wastewater treatment plants, providing clear knowledge of the characteristics of the wastewater being treated.
It provides real-time data about the concentration of organic matter and detects changes in the influent that can adversely affect WWTP performance.
The minute-by-minute data from SENTRY enables wastewater stream engineers and operators to continually monitor the microbial stability of their treatment process or anaerobic digesters and can be used to improve and optimise system performance and energy efficiency.
SENTRY data shows the actual oxygen demand, allowing process adjustments that can reduce electrical consumption and chemical usage.
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WWTP – Influent Monitoring
SENTRY can detect changes in the influent characteristics that can lead to effluent violations and impaired water quality standards. SENTRY provides a real-time insight into the organic matter present and provides operators with an opportunity to make process changes to reduce electrical consumption and chemical costs.
WWTP – Energy Optimization
SENTRY provides a minute-by-minute signal that can be used to control aeration systems. Real-time data about the concentration of organic matter in the wastewater informs operators of the actual oxygen demand and detects changes to influent characteristics, allowing adjustment of aeration to minimize energy consumption.
Anaerobic Digestion Optimization
SENTRY can be used to optimize biogas production while maximizing volatile solids destruction. SENTRY’s bioelectric sensor detects volatile (fatty) acids, providing a unique measurement of biological activity that can be used to control pumps and valves and simplify the design of feedstock mixtures.
SENTRY
How Does SENTRY Work
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Wessex Water
United Utilities
WWTP Biomass Loss
Anaerobic Digestion
Specification
Sensor Type: Bioelectrochemical
Measurement Type: Electron generation rate (electrical current) from biological oxidation of organic matter in solution.
Metric: SENTRY Signal (SenS), reported as consumable cBOD (or VFA in anaerobic environments). Surrogate for readily biodegradable chemical oxygen demand (rbCOD).
Measurement Performance Range: 0.1 to 25,000 mg/L rbCOD equivalent
Measurement Frequency: SENTRY signal generated each minute (1,440 values per day) Applied voltage signal generated each minute (1,440 values per day)
Sensor Control Panel
Operating Temperature: -20°C to 55°C (-4 °F to 131 °F)
Humidity: 5-90%, non condensing
Power Supply Requirements: 24 VDC, 1.1 amp max
Analog Outputs: 4-20 mA (Active); Loop resistance 500 Ohm; Update rate 20KHz, Resolution 12 Bit; Short-circuit, over-current, over-temperature, ESD, and transients protected.
Dimensions: W 0.31 x L 0.40 x D 0.13 meters
Weight: 3.3 Kg
Sensor
Storage Temperature: 1 – 4 °C (33.8 – 39.2 °F)
Operating Temperature*: 4 – 60 °C (39.2 – 140 °F)
Immersion Depth*: 25 feet (7.6 meters.), maximum
Immersion Pressure*: 75 kPa (10.8 psi), maximum
Sample pH Range*: 6.0 to 8.0 Standard Units
Water Velocity: 0.5-5 m/s (1.6 – 16.4 ft/s)
Incompatibility (within proximity to dosing point): Metal salts – based coagulants, polymers, disinfectants, prolonged exposure to air
Mounting Options: Open channer or in-pipe. Secured by 1.5” NPT threading in sensor body.
Mounting Requirements: sensor electrode must be completely and constantly submerged in water during operation.
Distance (sensor to control panel): 45 meters (150 feet), maximum.
Length: 219 mm
Diameter (measured at widest point): 49.5 mm (1.94 inches)
Scheduled Maintenance: Sensor cleaning every 90 days depending on conditions, sensor and cable inspection every 90 days, no calibration required
(*) Optimal operational ranges, application depending. Can effectively perform outside of optimal range at the discretion of a SENTRY
Client Manager or SENTRY Representative based on a review of local conditions.