Flue gas oxygen and combustibles analyser
May 2005
Analytical Instrumentation & Environmental Monitoring
Ametek's convective WDG-HPIIC flue gas oxygen and combustibles analyser mounts directly on the combustion process to provide continuous measurement of oxygen or combustibles.
The field serviceable analyser is suitable for flue gas temperatures up to 1537°C using a choice of probe assemblies. Housed in a lift-off NEMA 3R weather resistant, stainless steel enclosure, the analyser can be provided in a range of mounting styles, and for hazardous area locations, explosion-proof versions are available.
Since the sample inlet and return are inside the filter and at the same absolute pressure as the process, there is no pressure drop across the filter. The flue gas oxygen diffuses through the filter and the sample flows through the sensor plumbing because of a convective motive force. The sample in the vertical cell housing is heated to 695°C while the sample in the return vertical tube is at approximately 249° C. This temperature difference generates a density difference that circulates the gas through the system. Process gas enters and replenishes the gas inside the filter by diffusion only. This eliminates filter blockage making the analyser ideal for high particulate applications.
The WDG-HPIIC is used in conjunction with Ametek's Series 2000 control unit. It has a four line X 20 character vacuum fluorescent display and indicates combinations of oxygen, time and date, cell temperature, user programmable text, thermocouple mV or cell mV. It has two independent oxygen alarms, each high or low selectable, one alarm can be assigned as oxygen, calibrate or verify. Two high combustible alarms are also available.
The WDG-HPIIC analyser is suitable for use in a variety of furnaces, boilers, lime and cement kilns and various types of incinerators. The units are available in various Ex configurations depending on the hazardous area classification. Ametek is represented locally by OEN Enterprises.
Noel Bauchop, OEN Enterprises, 011 675 4447, [email protected], www.oenenterprises.co.za
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