Firma:                   Lauda

Modell:                WK 450

Kommentar:        Dokumente deut./engl.

Vorderansicht

Rückansicht

Construction and mode of operation

A refrigeration unit which essentially consists of a fully hermetical enclosed compressor with air-cooled lamellar condenser works for an evaporator which is installed in an insulated bath and cools the bath contents. At the front of the instrument fresh air is sucked in and heated air is removed at the rear; there­by the condenser and the compressor are cooled. The refrigeration circuit is hard-soldered, high vacuum dried, Mied with refrigerant ( R 12 ) and special cooling machine oil and maintenance-free.

The liquid bath is filled through a charging hole at the top. The liquid level can be read at the level indicator. At the rear of the instrument a drain cock is mounted for easy emptying of the bath, if required.

Each model can be supplied with two types of circulating pumps of different output. The nipples "flow" and 'Ireturn" are installed at the rear and marked.

For temperature control a capillary tube thermostat is mounted which switches off the refrigeration unit when a set temperature is reached.

Water Cooling Units of series WK 250 and WK 450 have proved ideally suitable for use in industrial laboratories, scientific institutes and production plants where cooling by tap water is difficult because of too high temperature, dirty­ing, excessive hardness, fluctuations of pressure,insufficient flow.

Furthermore the models WK 250, WK 250 T and WK 450 can operate at tempera- tures down to -25 °C when using a mixture of anti-freezing agent and water. Model WK 450 P operates only in the range above 0 °C.

Technical Data

Ref.No.                                                     3192

Operating range               (°C)                  +5/+40

Accuracy of control          (°C)                  ± 1

Refrigerating machine      (PS)                 1/3

Refrigerant                                               R 12

Cooling capacity              (Kcal/h)

          + 20°C                                            380

          + 10°C                                            340

              0°C                                             300

          - 10°C                                             240

          - 20°C                                             140

Bath capacity                  (Liter)               7

Pump output                    (l/min)              10

Discharge head               (mWG)            40

Pump connection            (mm i.d.)          R ½”

Power supply                   (V/Hz)              220/50

Connected load                (Watt)              600

Dimension WxDxH          (mm)                355x460x650

Weight                              (kp)                  52