Bordering Ohio and West Virginia along the Ohio River, the Racine Hydroelectric Plant operates using a high-lift gated dam that has been in commission since 1967. The plant is owned and operated by The American Electric Power Company and consists of two 24,000 kilowatt bulb-type Kaplan turbines operating 24 hours per day as conditions on the river permit.

Throughout the years, the Racine Plant has continually monitored dissolved oxygen in the Ohio River to ensure levels do not fall out of regulation. When the plant’s existing dissolved oxygen monitor and sensing system became irreparable, plant engineers contacted NexSens Technology to learn more about the value added by integrating a NexSens real-time data logging system with Analytical Technology Inc. (ATI) process monitoring systems.

Out with the old, in with the new

NexSens applications engineers were contracted to assist with the removal of the old dissolved oxygen system and implementation of the new system at the plant’s operations facility. Within an existing steel enclosure, engineers mounted an ATI Q45D dissolved oxygen monitor with an Auto-Clean air blast DO sensor.

ATI’s Auto-Clean system periodically generates a series of high-pressure air blasts to remove foulants from the face of the sensor. The Auto-Clean is set up at user-defined intervals to adjust for high or low fouling environments. This feature significantly reduces manual cleanings and sensor maintenance intervals for plant engineers.

The rugged five-millimeter Teflon membrane DO sensor is mounted within a NexSens A100 flow cell designed specifically for industrial applications. By connecting into the existing water lines, the flow cell continually provides a fresh sample for the DO sensor to analyze.

The Q46D dissolved oxygen monitor features an interactive LCD user interface screen that allows plant engineers to view live DO concentration and temperature readouts and perform on-site DO sensor calibrations. Air and sample sensor calibrations allow compensation for temperature, barometric pressure, and salinity.

Mounted against the steel enclosure, a NexSens iSIC data logger with landline modem interfaces with the Q46D monitor. This allows all dissolved oxygen data to be logged into the iSIC’s memory and sent via landline telephone to NexSens iChart servers in an offsite location.

With iChart software’s unique alarm notification feature, plant engineers have set up alarm notifications to be sent via email when dissolved oxygen readings fall below 5 mg/L. Additionally, iChart is set up to automatically send daily Excel data reports via email to collaborating agencies along the river. The automation and data processing capabilities of the NexSens system have greatly increased dissolved oxygen process monitoring efficiency for plant officials.


X2 Environmental Data Logger

The NexSens X2 Environmental Data Logger offers the latest in real-time monitoring technology with wireless communication, large plug-and-play sensor library, and ultra-low power consumption.

ATI Q46D Dissolved Oxygen Monitor

DO monitoring in wastewater aeration systems, eflluent channels, or natural waters are easily handled by the Q46D on-line monitoring instrument.