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 The Need
Modern gas, oil and coal fired boiler operations require dependable, low-maintanence, application flexible devices to monitor and control combustion processes. The measurement of excess oxygen in flue gas is particularly important for obtaining maximum combustion fuel efficiency while minimizing thermal or fuel-bound Nitrogen oxides generation. The zirconium oxide insitu probe has become the industry standard for making this flue gas-oxygen measurement. However, most insitu probe designs do not afford ideal accessibility to filter, cell and heater components, requiring removal of the probe from the process flange for servicing.
The Solution
The WDG Insitu flue gas oxygen probe differs from all other oxygen insitu probes. The unique inner/outer probe design facilitates removal of cell, heater and thermocouple assembly through the probe head. Once the inner probe assembly is removed, the outer probe support pipe allows straight run access to insitu filter for cleaning with compressed air. The inner probe assembly also exposes the reference side of the zirconium cell to ambient air eliminating the need for instrument air utilities at the probe mounting location. The combination of component access and reduced utility requirements provides a cost-effective reduced maintenance solution for today and tomorrow's gas, oil and coal fired boiler operations.
There are three control options available for the WDG Insitu flue gas oxygen probe to maximize integration with existing plant or process control systems.
- IQ Series Transmitter provides probe head mounted full function electronics with analog outputs, alarms, expanded system diagnostics, auto calibration feature and optional Hart communication.
- 2000 Series Microprocessor Control provides 4 line local display, analog outputs, alarms, expanded system diagnostics, auto calibration option.
- 1200/1210 Series Compact Control provides 2 line local display, one analog output, alarms, general system diagnostics, software supported manual calibration.
Other Products of Interest
| Specifications |
| Principle of Operation: |
Zirconium Oxide |
| Output Range: |
From 0-1% to 0-100% oxygen |
| Accuracy: |
±1% of measured value or ±0.05% oxygen, whichever is greater |
| Response: |
63% of a step change in <20 seconds |
| Drift: |
<0.1% of cell output per month (<0.005% O2 per month with 2% O2 applied) |
| Linearity: |
±1% of output span |
| Repeatability: |
±1% of output span |
| Max. Flue Gas Temp: |
1250ºF (600ºC). Probe material highly corrosion resistant |
| Alarm: |
Alarm can be set to oxygen, start of calibration, start of verify, or both |
| Contact Rating: |
1 A, 30 V max., noninductive load, AC or DC |
| Diagnostics: |
Watchdog timer and service alarm (trouble alarm). System test for A/D, RAM, and EEPROM. Twenty-entry event log. |
| Communications: |
RS-485, RS-232 (IQ links), HART© Option available |
| Analog Output: |
Isolated linear current output. Select O2, cell temperature, thermocouple mV or cell mV. The output can be 4-20 mA, 0-20 mA, 20-4 mA or 20-0 mA and is fully scalable. Hold or track during calibration and select degree of damping. Maximum load 1100 ohms. |
| Sample Pressure: |
±10 in. water gauge |
| Power Requirements: |
115 VAC, ±10%, 47-63 Hz; 230 VAC, ±10%, 47-63 Hz, 150 VA max. |
| Enclosure: |
UL Type 4X (NEMA 4X). Optional NEC Class 1, Div 2 version available (for subatmospheric pressure only) |
| Calibration: |
Oxygen cell lifetime extender. Calibrate or verify calibration. Store last calibration gas run time and process recovery time. Timed automatic calibration with optional Remote Calibration Unit. |
| Calibration Gas Requirements: |
Use calibration gases at 10 psig, 1 to 2 schf (0.70 kg/cm2, 0.47 to 0.94 L/min) |
Product Data Sheets
Application Note
Refer to the Product Data Sheets in the Documentation tab to see the applicable certifications for this product.
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