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September 1, 2004 11:39 am, CH_Maintenance.fm
Adjusting the Sensitivity of the Plate Sensor Switch
Applied Biosystems 7900HT Fast Real-Time PCR System and SDS Enterprise Database User Guide 7-37
Adjusting the Sensitivity of the Plate Sensor Switch
When to Perform
The plate sensor switch located underneath the arm of the Zymark Twister
Microplate Handler requires adjustment under the following circumstances:
• When changing sample block module formats
• If the Plate Handler is having difficulty sensing plates
Materials
Required
• Optical plate (of the current sample block format)
Adjusting the
Plate Sensor
Switch
The dimensions of different plate formats can place different requirements on how
the Plate Handler grips plates. To ensure smooth operation of the Automation
Accessory, adjust the plate sensor switch when changing consumable formats.
1. Power off the Zymark Twister Microplate Handler.
PHYSICAL HAZARD. The Zymark Twister Microplate
Handler must be powered off at all times during the following procedure. Failure
to comply can result in physical injury to the user or damage to the Plate
Handler.
2. Clear the switch position by turning the thumb wheel all the way to the Up
extreme (as indicated on the side panel).
3. Begin the adjustment of the sensor switch:
a. Grasp an optical plate by the sides, making sure not to place pressure in the
center of the plate to deform it.
b. Place the plate between the fingers of the gripper assembly and align it to
the middle of the centering device.
c. While holding the plate in position, slowly turn the thumb wheel to lower
the switch onto the reaction plate until the switch:
– Contacts the top of the plate, and
– Emits a soft, audible “clicking” noise
IMPORTANT! The sound emitted by the sensor switch is very faint and may be
difficult to hear. To make the adjustment easier, place your ear close to the
sensor switch while making the adjustment and listen for the switch to engage.
Thumb wheel
Plate-sensor switch
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