Drucker Diagnostics Model 842HS Centrifuge - Manual (Page 8)

CONTROL PANEL FUNCTIONS:
Time Adjustment and Timer Operation - The run time may be set from 30 seconds to 99
minutes and 30 seconds. Press the up and down arrow buttons next to the time display to adjust
the run time. Adjustments may be made prior to a run or after a run begins. A quick tap will adjust
the time by 30 seconds. Hold down the button for 1 minute adjustments - continue to hold for 5
minute adjustments.
Press the down button once while 00:30 is displayed to access the “hold” feature. When a “hold”
run is initiated, the timer will count up to keep track of total run time. The unit will run for a maximum
of 99 minutes and 30 seconds and will then shut off automatically. The “hold” run may also be
terminated by pressing the STOP/OPEN button. The total run time during a “hold” run is displayed
on the time display until the operator unlocks the lid by pressing the OPEN button or opens the lid
(during the automatic unlock after the run ends).
Speed Adjustment / RCF Display - Press the up and down arrow buttons next to the speed
display to change to run speed. Adjustments may be made prior to a run or after a run begins.
A quick tap will adjust the speed by 50 RPMs. Hold down the button for 100 RPM adjustments.
Continue to hold for 500 RPM adjustments.
Press the RCF button at any time to convert the current speed setting to the corresponding force
value (xg). The speed may be set by RCF by holding down the RCF button while using the up/
down speed set buttons. The jumps made in the RCF value while holding down the RCF button and
pressing the up and down arrow buttons correspond to 50 RPM adjustments in speed. Since the
RCF is a function of the square of the speed, this jump size will vary.
Starting and Stopping a Run - With the lid switch closed, press the START button to begin a
run. Press the STOP/OPEN button at any time during a run to terminate it.
Unlocking the Lid - The lid is unlocked whenever the red UNLOCKED indicator light is
illuminated. The lid unlocks automatically for 60 seconds at the end of a run. The lid can also be
unlocked for an additional 15 seconds by pressing the OPEN/STOP button while the unit is idle.
The lid cannot be unlocked while the rotor is spinning.
Imbalance Detection Reset - This centrifuge is equipped with imbalance detection. If an
imbalance is detected, the centrifuge will terminate the current run and will begin to brake to a stop.
The words “BALANC” and “ERROR” will flash on the speed display. Once the rotor has stopped,
open the lid to cancel the error reporting, balance the load and begin a new run. Alternately, the
error reporting can be canceled by pressing the OPEN/STOP button.
ADVANCED USER SETTINGS:
This centrifuge allows for total control of the run by the user. You may adjust the acceleration rate,
adjust the braking rate, adjust the imbalance sensitivity level, select from several audible settings,
and use the optional countdown delay.
Acceleration Rate - The user may adjust the acceleration rate from minimum (1) to maximum
(10) using the following procedure:
1. While the centrifuge is idle, press the PROGRAM button.
2. Use the UP/DOWN arrow buttons next to the speed display until “ACCEL” is
displayed in the speed display.
3. The current acceleration rate is displayed in the time display. Use the ‘UP/
DOWN arrow buttons next to the time display to adjust the acceleration rate
from 1 (minimum) to 10 (maximum).
4. Press the PROGRAM button to exit or use the UP/DOWN arrow buttons next to
the speed display to adjust additional settings.
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