GE Sensing OxyTrak 411 Data sheet

Sensing

Applications

OxyTrak™ 411

Panametrics In Situ Flue Gas Oxygen Analyzer

OxyTrak 411 is a Panametrics product. Panametrics has joined other GE high-technology sensing businesses under a new name

GE Industrial, Sensing.

An in situ oxygen analyzer for

• Utility boilers; natural gas or oil fired

• Process heaters; natural gas or oil fired

Features

• Self calibrating

• Sealed internal reference sensor_no reference gas required

• IR through-the-glass keypad for Zone 1/Division 1 areas

• Probe lengths of 19, 39 or 60 inches (0.5, 1 or 1.5 m)

• One-step, one-gas, calibration verification

• Drop-down menu user program

• RS485 or RS232 communications port

• Isolated current loop or voltage output

• Fail-safe fault alarm

• Onboard system diagnostics

Sensing

Self Calibrating with No Reference Gas

The OxyTrak 411 uses a patented miniaturized zirconia sensor with a sealed internal-reference chamber to accurately determine flue gas oxygen content and rapidly respond to process changes. This new sensor’s unique design is self calibrating. The internal electrical calibration of the sensor is performed automatically without the need for calibration gases.

User-Friendly

The OxyTrak 411 is a modular design that maximizes serviceability. A separate port is provided for access to the sensor core.

Why Monitor Flue Gas?

Ideally, every burner should mix a precise ratio of air and fuel, and the fuel should burn stoichiometrically to yield only heat, water vapor and carbon dioxide. In reality, this rarely happens. Burners age, mixing is imperfect, colorific value of fuel varies, firing rates change, and the weather changes from day to day. Any of these factors can change the amount of air required for safe and efficient combustion of fuel. Accurate flue gas analysis minimizes fuel costs and reduces pollution in all combustion processes.

Accurate and reliable oxygen measurement has always been dependent upon tedious sensor calibration and costly reference gases_until now.

Too little O

Increase air

supply

Typical

zone of

control

Too much O

Decrease air supply

Low High

Combustibles

losses

O2&

combustibles

optimum

control

point

O2only

operating

set point

Excess

air losses

Typical Combustion Control Scenario

% Excess O

PPM Combustibles

Combustion applications typically trim burner air supply to run excess oxygen at an optimal level to ensure complete combustion.

The system works by pumping oxygen out of sealed reference chamber to establish a baseline and then measuring the electrical charge as oxygen ions re-equalibrate back into the chamber equal to oxygen partial pressure in the flue gas. The electrical charge measured is directly proportional to oxygen concentration.

In addition, the sensor’s sealed internal-reference chamber eliminates the need for a reference gas. If manual calibration verification is desired, a gas port is provided for a simple, one-gas, one-step procedure, using air or other gases and remote or local user interfaces.

Sensor assembly access port and probe assembly

Glass

seal

Sensor

Diffused process gas flow

ZrO

Inner reference chamber

Inner electrode

Outer electrode

Sealed-reference zirconia oxygen sensor and sensor technology

Sensor assembly access port with sensor assembly partially removed

Sensor assembly

(not to scale)

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