Leica DM IRB manual Operating modes, DRY and Immersion, Changing the operating mode

Operating modes

DRY and IMMERSION

The Leica DM IRB microscope is equipped with a switch function between the operating modes “Dry” and “Immmersion” (IMM) to ensure straightforward, error-free operation.

This prevents

–dry objectives from being immersed in oil by mistake

–immersion objectives from being used without immersion oil by mistake.

Changing the operating mode

The operating modes are switched by simulta- neously pressing the keys “lower z position”

and “focus position” on the control panel of the microscope. This means that immersion cannot be travelled to in Dry mode and dry objectives with a short working distance cannot be travelled to in Immersion mode.

To ensure smooth operation, immersion oil must be applied to all oil immersion objectives in the nosepiece that are to be used before you start work.

Contamination of the dry objectives is prevented by the fact that the objective nosepiece is always lowered before objectives are changed.

When switching from one operating mode to the other, please proceed as follows:

Starting in the DRY mode:

(Display at the bottom right in the LD display: D)

Press the keys “lower z position” and

”focus position” on the control panel of the microscope simultaneously to switch from Dry to Immersion.

The objective nosepiece is lowered and the message “Change Objective” appears in the display. The corresponding oil immersion objective is switched into the light path with the objective changing key (normally the upper objective changing key). From now on, only oil immersion objectives or objectives of the “Combined” category are travelled to.

(“I” now appears in the LC display at the bottom right).

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