SKIL Controls - Oxygen Monitor:

Technical Data

Ordering

The SKIL flue gas oxygen monitor is designed to provide a reliable and accurate measurement of oxygen within the flue gases from industrial boilers, furnaces and incinerators. The monitoring of oxygen within the flue gas is the most reliable and repeatable means of assessing correct burner operation, combustion efficiency and thereby minimising emissions in the atmosphere.

The Model 2010 is a solid state electronic monitor consisting of a flue stack mounted zirconium dioxide sensor and wall mounted indicator control unit.

Applications:

Direct measurement of excess air (residual oxygen content) after combustion - ideal for boilers and furnaces. The determination of the oxygen content within protection gases with respect to gas packaging of foods etc. Control facility to ensure minimum consumption of gas.

Principle of operation:

The oxygen content of the flue gas is measured via a heated zirconium dioxide (Zr02) cell. The surface of the cell when installed, is positioned in direct contact with the flue gases, therefore omitting the need for sample pumps and cooling systems making the OC2010 ideal for measurement of oxygen content.

The probe is mounted in the flue gas channel and any subsequent flue gas is diverted to the heated cell via a guide tube. The oxygen content is the difference between the atmosphere and the flue gases. A resultant display range of 0.5% to 20.9% oxygen is provided by the 3 digit display. The signal (isolated 4 to 20 mA) is retransmitted for use with a recording device that will accept 4-20mA signals.

Features:

Solid state electronics
Accurate, instantaneous read-out
Simple & precise alarm settings
Probe fault alarm
Simple calibration control
Isolated 4 to 20mA

Benefits:

No moving parts or pumps
Easy mounting and maintenance
Attractive design in anodised aluminium
Probes can be exchanged without recalibration
Long calibration intervals
Cost effective

Specification:

Monitoring unit

Display: 3 Digit, seven segment display showing 0.50% to 20.95% oxygen.
Output signal: 0 (4) - 20mA corresponding to 0 - 20.95% oxygen 0 - 4mA switch selectable, Maximum series resistor 600 ohm.
Accuracy: Display ± 1% on last digit, Current output < ± 0.2% of maximum signal.
Ambient temperature: 0 - 600C
Supply voltage/supply power: 240V ± 10% 50/60Hz 15VA In the heating period of the probe (approx. 2 minutes) 30VA Max. thereafter.
Alarms/output relays: Two individually set alarms - 6A rated at 250 volts AC.
Protection: IP54 (IP64 on request)

Measuring probe

Insertion length: 29mm (plus length of possible guide pipe)
Working temperature: Flue gas temperature 0 - 6000C, Ambient temperature 0 - 600C ( Optional ) High temperature probe will be required for temperatures above 6000C.
Time constant: (T90) Typically 4 seconds, maximum 15 seconds.
Measuring accuracy: After 1000 hours: at 5% O2 < ± 0.15% O2 at 10% O2 < ± 0.30% O2
Repeatability: At 2% O2 ± 0.1% O2 Between 4 - 6% O2 < ± 0.2% O2
Connection: 2 metre long Teflon cable finished with multi-pole connector.
Calibration interval: 6 months (on gas boilers) otherwise 12 months.

Ordering information and model code:

Key Model Code.

Code: OC2010
Description: Single channel oxygen monitor for flue gas temperatures of 0 - 5500C.

Table 1 - stack diameter

Table 2 - accessories

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