Sample Cooler

Product Description

Sample Coolers

JWT Sample Coolers are designed for use with on-line process analyzers, to reduce the sample temperature to a level acceptable for the instrument. They are compact, inexpensive, and designed for years of trouble-free service.

The coolers are a coiled tube-in-shell design, with counterflow design. Counterflow means that the cooling water enters the shell at the same end that the sample is leaving, thus giving you the lowest sample temperature possible.

Cooler Efficiency

Sample coolers need to be designed (and constructed) properly in order to achieve the best efficiency. Efficiency for coolers usually means the 'approach temperature', which is the temperature difference between the cooling water entering the cooler and the sample leaving the cooler. In order to improve the efficiency, our coolers have an inner tube that increases the cooling water flow rate (hence turbulence) across the cooling tubes. Therefore, efficiency is improved, resulting in lower final sample temperature and/or less cooling water being required.

Cooler Size

We offer 2 sample coolers, one with 3MM OD tubing, and the other with 6MM OD tubing. The 3MM OD tubing is perfect for those applications where you only need to cool enough sample for an analyzer (typical flow of 200-250 ccm). Although the 3MM tubing has better heat removal efficiency than 6MM tubing, it's limited in capacity due to the shorter length of tube, and is not suitable for cooling steam samples. (Longer tubes would increase the pressure drop to an unacceptable level. ) By offering a cooler with 3MM tube, we keep the cost low by not forcing you to buy a cooler that's much more than your application demands. (Such as the 6MM cooler. )

The 6MM coolers can be used for steam and hot water samples, and have enough capacity to cool a high temperature sample to within 3C of the cooling water temperature, up to approximately 800 ccm of sample flow. They are perfect for systems where you need enough sample for an analyzer and a continuous grab sample, or for secondary cooling to improve temperature control.

Replaceable Coils

Our design allows you to replace just the coil, should the coil fail in some way. The most common cause of failure is chloride stress-corrosion cracking at high temperatures. We can offer alternate materials (such as Inconel) if this is a problem in your application.

Note: Other sizes, capacities and materials are possible; Please consult the factory for assistance. Note 2: Max pressure is calculated based on ASME B31.1, Power Piping, at the maximum rated temperature.

Typical Performance - Approach Temperatures

Note: To use this table, select the flow rate and sample temperature, read the approach temperature. If the cooling water is 25C and the approach temperature 2C, the final sample temperature will be 27C. Cooling water flow is 3.5 lpm and 11 lpm for 3MM and 6MM coolers.

Cooling Water Requirements
Pressure: <9 Bar (Other pressures - consult factory)
Temperature: 25-35C Typical
Flow Rate: 3MM cooler: Less than 4 lpm
6MM Cooler: Less than 12 lpm

Chemistry: Typical process water, clean, with chloride concentration less than 10 ppm. Requirement varies based on the sample temperature, as chloride stress-corrosion cracking is more severe at higher temperatures.

Accessories

3MM cooler Sample connection fittings, 316SS: 3MM tube compression x 1/4'' NPT 3MM tube compression x 1/4'' BSPT

6MM cooler Sample connection fittings, 316SS: 6MM tube compression x 1/4'' NPT 6MM tube compression x 1/4'' BSPT