Fluids - Neslab HX Series Installation, Operation And Maintenance Manual

Analog recirculating chiller

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reductions must be made, they should be made at the inlet and outlet of the

instrument being cooled, not at the HX.

If substantial lengths of connecting tubing are required, they should be

pre-filled with cooling fluid before connecting them to the unit.

Water-cooled units

The plumbing connections used to connect the water-cooled condenser in

the HX to the facility cooling water supply are located at the rear of the unit

(labelled TAP WATER and DRAIN). On models HX-75 through HX-300,

these fittings are ½ inch FPT. On models HX-500 and HX-750, these fittings

are 1 inch FPT.

Remove the plastic protective plugs from the TAP WATER and DRAIN

connections. Connect the TAP WATER fitting to the facility cooling water

supply. Connect the DRAIN fitting to a drain.

Fluids

The selected cooling fluid must have a viscosity of 50 centistokes or less at

the lowest operating temperature.

Never use flammable or corrosive fluids with this unit. Distilled and

deionized water may be aggressive and cause material corrosion.

Please contact NESLAB before subjecting this unit to prolonged

exposure to distilled or deionized water.

Tap water is the recommended fluid for operation from +8°C to +35°C.

Below +8°C, a non-freezing solution is required. A 50/50 mixture, by

volume, of water and laboratory grade ethylene glycol is suggested.

Do not use automobile anti-freeze. Commercial anti-freeze contains

silicates that can damage the pump seals. Use of automobile

anti-freeze will void the manufacturer's warranty.

For units with extended temperature ranges above +35°C, tap water is the

recommended fluid up to +80°C. Above +80°C, the user is responsible for

the fluid(s) used.

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