ABI Prism® 7900HT Sequence Detection System ... - OpenWetWare

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 The following materials are required to adjust the plate sensor switch:
Adjusting the 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.
7-28 System Maintenance
Material Part Number
ABI PRISM Optical Reaction Plate (of the current sample block format) See page D-1
To adjust the plate sensor switch:
Step Action
1 Turn off the Zymark Twister Microplate Handler.
! WARNING PHYSICAL HAZARD. The Zymark Twister Microplate Handler must
be turned 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).
GR2014a
Thumb wheel
Plate-sensor switch
3 Begin the adjustment of the sensor switch as follows:
a. Grasp a 96- or 384-well ABI PRISM Optical Reaction 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.