Happy New Year! Is anybody using a ThermoNESLAB chiller to cool their lasers? We have acquired an HX2000, which recommends the use of 30-50% glycol. The big concern here in San Diego is those bitter-cold nights we suffer through all winter long! Seriously though, Coherent does NOT recommend using glycol, for they claim it will shorten tube life. Unfortunately, NESLAB voids the warranty if its unit is run with straight distilled H2O because, in the event of East Coast-like freezing nights (I know, not likely!), the H2O's freezing and consequent expansion would cause a lot of damage to the chiller. Anybody have any experience or input here? The chiller's flow rate is on FL1, the pipe diameter is on FL2... Andrew
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