Westinghouse PCA-612 Portable Combustion Analyzer

This Westinghouse PCA-612 analyzer powers on but cannot be tested fully - the oxygen sensor requires replacement. Selling AS-IS with all parts seen in photos.

The Westinghouse PCA-612 portable combustion analyzer is designed to provide a simple and inexpensive means to study boiler efficiency. An efficiency study provides useful information for proper calibration and maintenance of existing boiler combustion controls. The efficiency information is also useful in commissioning a trim control system.

The Westinghouse PCA-612 portable combustion analyzer does the following:

1. Measures excess Oxygen content in flue gas.
2. Measures carbon monoxide (CO) content in flue gas.
3. Measures net stack temperature.
4. Calculates combustion and boiler efficiency.
5. Calculates CO2 level.
6. Measures smoke density of flue gas.
7. Displays all of the above measurements and calculations (except smoke density and CO, level) on a digital liquid crysta! display (LCD) readout.
8. Stores all of this information in memories.
9. Prints all information on demand

The PCA-612 consists primarily of a sampling probe, an analyzer, a temperature sensor, and a smoke pump. There is also a power cord, a carrying strap, and a carrying case that holds all of these components.

The sampling probe consists of a probe tube and a handle sealed by an O-ring. A particle filter located in the handle end and a thermocouple assembly runs the length of the inside of the probe tube. The handle is coated with heat-resistant rubber for operator safety and comfort. Silicone tubing conducts the gas sample to the analyzer. 

To make sure that all samples are taken from the correct depth in the stack, there is an adjusting cone on the probe. To use this cone, the operator calculates depth of the stack from which the user wants to take a sample (usually 1/3 of djameter of stack). If the correct depth of stack A is 10 inches (254 mm). The user then slides the cone until there are 10 inches from the sample end of the probe and the end of the cone, and then tightens the screw. When the probe is inserted firmly into the stack, this will stop penetration at 10 inches and assure that the sample is taken from the correct depth in the stack. The cone also acts as a seal, to keep outside air from contaminating the flue gas sample. 

Primary components in the analyzer enclosure are an O2 sensor, CO sensor, microprocessor PCB, power supply PCB, sample pump, battery pack, display, front panel, thermal printer, and printer interface PCB. There is also tubing, cables, wires, connectors, switches, brackets, and fasteners to support all of these components.