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½ inch ID tubing. If the unit is being plumbed using flexible tubing, install one
set of adapters in the plumbing ports. To prevent leaking, be sure to wrap the
threads of the adapters with Teflon
®
sealing tape before installing them in the
plumbing ports.
Flexible tubing, if used, should be of heavy wall or reinforced construction. All
tubing should be rated to withstand 80 psig at the highest operating tempera-
tures. Make sure all tubing connections are securely clamped. Avoid running
tubing near radiators, hot water pipes, etc. If substantial lengths of tubing are
necessary, insulation may be required to prevent loss of cooling capacity.
Tubing and insulation are available. Contact our Sales Department for more
information (see Preface, After-sale Support).
It is important to keep the distance between the unit and the instrument
being cooled as short as possible, and to use the largest diameter tubing
practical. Tubing should be straight and without bends. If diameter reductions
must be made, they should be made at the inlet and outlet of the
instrument being cooled, not at the CFT.
If substantial lengths of cooling lines are required, they should be pre-filled
with cooling fluid before connecting them to the unit.
Fluids
Never use flammable or corrosive fluids with this unit. Do not use
automotive anti-freeze. Commercial anti-freeze contains silicates that
can damage the pump seals. Use of automotive anti-freeze will void the
manufacturers warranty.
We recommends using distilled/deionized water with a 0.05 to 0.1 megohm-cm
reading.
Highly distilled/deionized water, above the 3 megohm-cm region, may
become aggressive and is not recommended for use with units with
wetted parts other than stainless steel. Distilled/deionized water in the
15 megohm-cm region is definitely aggressive and should not be used.
Units operating in these regions should be closely monitored. See
Water Quality Standards and Recommendations in this section.
If you do not have access to distilled/deionized water we recommend using
filtered tap water. We cannot recommend any custom fluids; these fluids are
too dependent on your particular application.
Below +8°C, a non-freezing solution is required. The selected cooling fluid
must have a viscosity of 50 centistokes or less. A 50/50 mixture, by volume,
of distilled/deionized water and laboratory grade ethylene glycol is suggested.
For units with extended temperature ranges above +35°C, we recommend
distilled/deionized water up to +80°C. Above +80°C, you are responsible for the
fluid(s) used.
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