Gemmy PLC-012, Manual

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How to calibrate Speed Indicator PLC-012, PLC-024
This universal centrifuge was initially calibrated by adjusting the rpm in
house to match the practical rotation. If this adjustment becomes
failed after use by the span of time, recalibrate the speed indicator is
required as depicted below
：
1
、
Turn the switch to ON position.
2
、
Set speed to 1000 rpm by turning the control knob and measure
the correct rpm of rotor spinning by an electronic digital
tachometer. Then see whether or not the setting variable could
match practical variable. Refer to operation established by the
tachometer manufacturer.
3
、
Adjust the rpm of speed indicator to match the measured rpm by
turning the screw under the speed indicator until they are
matched exactly. Clockwise turning indicates the increase of
scale of rpm, counterclockwise turning indicates the decrease of
scale of rpm
4
、
Repeat the above procedures until the practical speed matches
the value on tachometer.
WARNING
：
： ：
：
Take care of the HIGH SPEED when calibrate the speed which may
cause personal injury. GEMMY recommend the 2 engineers for speed
calibration, one uses digital tachometer to measure the practical speed
and the other one adjust the speed indicator.
NOTE
： ： ： ：
1
、
The operation of AC motor is easily affected by its surrounding
power consumption, which will result in a fluctuation of speed.
To assure an accurate rpm and its corresponding RCF, do not
place this equipment in the draft, sunlight or near a piece of
equipment that emits heat as well as Electromagnetic
conduction emission.
2
、
Users are requested to use a digital tachometer to measure the
practical rpm and calibrate the speed any time when it is
required in order to attain the accurate testing result.
3 、 Always start the timer from ZERO
4
、
Always open lid only until the motor has stopped completely.
5
、
When the maximum speed is operated, remember to keep the
rotor balanced in order to avoid the possible broken tubes.
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