Leica 3325, 3326, 3327, 3328 User manual

The Leica

Darkfield

Quebec

Colony Counter Model

3325/3326/3327/3328

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1.0 INTRODUCTION

The LEICA DARKFIELD QUEBEC®Colony Counter provides effi­cient, accurate and convenient colony counting. Even, glare­free illumination over the entire culture plate assures clear,
quick results. By touching the colony with the counting probe
(Models 3327/3328), colonies are recorded on the digital dis­play; they appear bright and are readily distinguished from
other structures. Wolffheugel and Stewart counting plates are
available.

2.0 UNPACKING & ASSEMBLY

Carefully remove the LEICA DARKFIELD QUEBEC®Colony
Counter and accessories from the packing box and inspect
them to assure damage did not occur in shipping.

Place the instrument on a hard, flat surface.
A leg located on the bottom can be set at either a tilt angle or

locked flat to the instrument base.
Similarly, the 1.5X magnification lens may be raised or lowered

for user preference. A 1.5X auxiliary lens (Catalog No. 3331) is
available as an accessory and is designed to be placed over
the existing lens to increase the total magnification to 3X.

The LEICA DARKFIELD QUEBEC

®

Colony Counter (Model 3327
& 3328) includes a five-digit L.C.D. counter with a reset button,
a ground contact and counting probe (Figure 1). An optional
push button counter also is available.

The counting probe (Models 3327/3328 only) is shipped with the
needle tip reversed for protection from damage. To assemble
the counting probe for use, loosen the knurled nut, remove the
needle, place the blunt end in the chuck and retighten.

The ground contact has a magnetic base and is attached to
the instrument case so the arm extends over the culture plate
and touches the surface of the agar.

The push button counter plugs into the two-hole receptacle
at the rear of the colony counter.

3.0 TESTING THE INSTRUMENT

Before using the LEICA DARKFIELD QUEBEC®Colony Counter
it should be tested. Plug the electrical cord into a grounded
120V/60 cycle AC outlet (Model 3325/3327) or
230V/50 cycle AC outlet (Model 3326/3328).

Turn the instrument on using the switch located on the rear
panel. Touch the tip of the counting probe to the ground arm
probe. A count should register on the L.C.D. display, if the
colony counter is operational.

To return the L.C.D. display counter to “0” depress the reset
button.

4.0 CARE OF THE COUNTING PROBE

Care should be taken to keep the tip of the counting probe
sharp. If the needle is blunt, small colonies will be difficult to
count and accurately register.

The probe tips touching media and/or colonies should be
cleaned as dictated by good laboratory procedures. Solutions
of 70% isopropyl alcohol, iodine/alcohol, Lysol®Brand or form­aldehyde may be used to clean the tip without harm.

FFiigguurree 22

FFiigguurree 11

Explanattion of Warning Symbols

CCAAUUTTIIOONN::

Replace with same type and rating fuse

CCAAUUTTIIOONN::

Risk of electric shock

CCAAUUTTIIOONN::

(Refer to accompanying documents)

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