Peltier Gas Cooler / Water Trap Assembly
Proper Sample Conditioning is key to accurate and reliable flue gas measurements. The ECOM J2K employs
a high capacity Thermoelectric Peltier Gas Cooler and Condensate Trap to ensure proper conditioning of the
flue gas sample. The flue gas is drawn from the stack, through the probe and sample line where it enters the
gas cooler assembly. The gas travels thru a surface coated metal body with good thermal conductivity. The
gas radiates its heat to this metal body. A PELTIER element (semiconductor cooling element supplied by a
continuous current) creates a heat transfer from WARM to COLD, drains the heat of the metal body, and
conveys it to a fan cooled heat sink.
The condensation created by the heat loss of the gas drops in to a bowl and is pumped out automatically by
the peristaltic pump, which is controlled by moisture sensing contacts inside the water trap bowl.
The J2K's high capacity internal pump flows the sample gas at a rate which does not allow sufficient contact
time of the gas with the condensate, eliminating any absorption or "wash out" of the NO2 or SO2 gas. At the
cooler outlet, the gas has a temperature of about. 5 °C with a relative humidity of < 50%, corresponding to
what is considered a "dry gas sample."
Filter Maintenance
The small round fiber filter, part number 75316, found in the top of the Peltier cooler assembly, should be
inspected and changed prior to each use. To change this filter, unscrew the clear glass cover. Replace filter
and replace glass cover. Do not over tighten.
NOx / Sox Filter Cartridge
This filter, part number 71292, is used to scrub nitrogen and sulfur compounds from the gas sample going to
the CO sensor only. This eliminates any cross interference on the CO sensor, providing more accurate CO
readings. This filter material will be purple when new, then will change to a brownish / black color, and finally
some of the beads will turn ashy-white, when the filter needs to be replaced.
