The patent pending heat exchanging device eliminates the contamination of condensates in air sampling lines and in scientific measuring equipment. It uses heat exchange from the coolant system in internal combustion engines to continuously and consistently heat an air sampling line in the device.
The device is composed of a heavy steam traced bundled hose which contains two (2) process tubes and one (1) air sampling line. The process tubes in the device are spliced in to the primary coolant system of the internal combustion engine. The engine coolant (approximately 195 degrees Fahrenheit at 30 PSI) recirculates in the process tubes of the hose at approximately 3 meters per second. The process tubes in the device are in direct contact with the air sample line, made of ultra-high purity PFA. One end of the air sampling line is attached to a mass spectrometer, for example, and the other terminal end is used for air sample collection. This method and device facilitate maximum heat transfer to help maintain consistent high temperatures in the air sampling line, thus eliminating condensation contamination.
All three tubes in the bundled hose are incased in water soluble chloride in an absorption-resistant fibrous glass insulation that resists wicking. The insulation is covered in a non-halogenated thermoplastic urethane.
The length of device can be made to client specifications. A 200-foot length of the hose can maintain constant temperatures of 155 degrees Fahrenheit in the air sample line. Lengths greater than 200 feet require an auxiliary pump to recirculate coolant in the process tubes.
The device requires no heat strips, tapes, or wraps, which require enormous energy to power. Moreover, there are no brittle wires to break or inaccurate thermostats to monitor. The heat exchanging device overcomes the inherent problems of traditional heating methods for air sampling lines. There are no cold spots in the hose.
When condensation contamination in air sample lines, or worse, when condensation is sucked in to the analytic device, requiring extensive decontamination time, a heat exchanging device is your solution.