Intelligent Sensors Provide Multiple Measurements With Single Transmitter

Intelligent Sensors Provide Multiple Measurements With Single Transmitter
T80 universal transmitter and S80 intelligent sensors from Electro-Chemical

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The T80 universal transmitter and S80 intelligent sensors from Electro-Chemical measure pH, ORP, specific ion, dissolved oxygen, turbidity, conductivity and resistivity in municipal and industrial wastewater.

Specific ions include ammonium, bromide, cadmium, calcium, chloride, cyanide, cupric, fluoride, lead, nitrate, nitrite, potassium, sodium, sulfide and silver. The newest sensor measures the activity of free copper ions in concentrations from 1.0 ppb to 6,300 ppm.

“When you plug a sensor in, it automatically configures the analyzer,” says Steve Rupert, senior product manager. “The sensors have an identity, but the analyzer allows the user to program the sensor. If you had a copper sensor and you needed a nitrate sensor, you could switch out the electrode in the sensor, go to the transmitter with the sensor attached and tell it to analyze nitrate.”

The sensors are available in insertion/submersion or valve retractable designs. Standard models have a 3/4-inch O.D. 316 stainless steel body with 10-foot cable or optional detachable cable assembly for easy assembly.

The insertion/submersion design uses a 3/4-inch MNPT compression fitting as the process connection to accommodate installation in pipe tees, flow cells or through tank walls.

The valve retractable sensor uses a 1-inch ball valve with 1-inch process connection. Loosening the rear compression fitting allows the sensor to slide through the valve for either insertion into the process or retraction. Once retracted, the ball valve can be closed and the sensor removed for maintenance or replacement without shutting down the process line.

The transmitter features an intuitive menu and LCD display to provide graphical and numerical information, as well as 4-20 mA output with Modbus RTU and alarm relays. Hart communication is available.

Displays include data, millivolt and graphical screens. The data screen displays measurement type, measured value with units, percentage of milliamp output of the 4-20 mA channel and temperature.

The mV screen displays measurement type, raw millivolt signal from the sensor, percentage of milliamp output of the 4-20 mA channel and temperature.

Graphical screens display measurement type, measured value with units and graphical display of the milliamp output.

“You can switch between a single channel and dual channel with a single button,” Rupert says.

The analyzer also can be configured for alarm (setpoint) relays, time-activated relays or fault relays.

“The expiration timer is a nice safety feature,” he says. “If you add sulfuric acid to a system and the pH doesn’t change, something is wrong. The expiration timer shuts down the relay and signals a soft fault alarm telling you the relay is not working.” 800/729-1333; www.ecdi.com.



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