Instruction manual

HOW TO USE YOUR HARRIER 18/80 19
Refer to the chapter headed “Good Operator Practice” on page 14 for
centrifugation of samples with the following characteristics:-
Specific gravity in excess of 1.2
Corrosive materials
Infective samples
5.5 Balancing the rotor
The loads should be reasonably balanced, which, in most cases, means
equalising the liquid levels by eye. In the swing out rotor do not exceed 5 grams
between loads when fully or partially loaded.
When loading trunnion carriers (Cat.No.34136.110 and buckets 43156.603) the
following procedure should be adhered to:-
1) Weight group the buckets to within 5g.
2) Weight group the trunnion block and buckets as an assembly to within 5g.
Failure to load the rotor carefully may trip the out-of-balance sensor, causing
the instrument to stop, in this case the status display will show “IMBALNCE”. An
unbalanced rotor will make the centrifuge vibrate and it will be noisy in
operation.
5.6 Removing the rotor
Open the lid. Remove all the buckets and trunnions. Using a suitable bar
inserted through the hole in the spindle nut, unscrew and remove the spindle
nut. Grip the rotor on opposite sides and lift it clear of the drive head.
NEVER USE EXCESSIVE FORCE.
5.7 Closing the lid
Once you have loaded the rotor close the lid and push it firmly down. You will
hear a ‘click' this means that the lid has locked down securely. The status will
read “READY” and the run may be started.
5.8 Parameter entry
The current parameters are shown in the display windows. To start the machine
with the current parameters press
(start).
To alter the parameters press the relevant keys as described below. The
parameters can be changed in any order.
5.8.1 Entering run time
To change the run time press the (time) key. The time display will flash, and
the status will read “SET HOURS”. Enter the number of hours and press
again. The status will now read “SET MINS”. Enter the number of minutes and
press again. If zero hours was selected the status will read “ SET SEC”,
enter the number of seconds and press again. The display will stop flashing
and will read “READY”. If an error is made at any stage, press CE and re-enter
the time.
N.B. The maximum time that can be entered is 99 hours and 59 minutes or 99
minutes and 59 seconds. An error will be produced if the time entered is too
great, i.e. a time greater than 59 seconds.