Leica CM1950 Manuel D’Utilisation

11

Leica CM1950  – Cryostat

2.4

Securing/Locking the Handwheel

Always lock the handwheel and cover the cutting edge with the
knife guard prior to manipulating the knife or specimen, changing
the specimen, or taking a break.

To lock the handwheel, press the lever (1) outward. Continue turning the
handwheel slowly until the grip is in the upper or lower position and the
handwheel is locked. Press the lever fully outward; gently rock the hand-
wheel until the locking mechanism clicks into place noticeably.

To release the handwheel, press the lever (2) on the handwheel toward the
cryostat housing.

Centering of the handwheel (motorized instruments only)

Pull out the handwheel’s handle and position it in the middle of the
handwheel. The handle automatically engages in this position.

An important safety device on the cryostat is the centering of the
handwheel for motorized instruments.

Rotate the handwheel only if the refrigeration system is on and the
cryochamber is cold.

12 o’clock
position

6 o’clock
position

1

2

Fig. 8

Fig. 7

Fig. 9

2.

Safety and Design

Knife guard

Prior to manipulating the knife and specimen, changing the speci-
men or knife, or taking a break, always lock the handwheel and
cover the cutting edge with the knife guard.

The CE, CN and CN-Z knife holders feature knife guards; the glass anti-roll
plate of the CE knife holder also serves as a knife guard.