Applied Biosystems 7900HT Fast Real-Time PCR System and SDS ...

Adjusting the Sensitivity of the Plate Sensor SwitchAdjusting the Sensitivity of the Plate Sensor SwitchWhen to PerformMaterialsRequiredAdjusting thePlate SensorSwitchThe plate sensor switch located underneath the arm of the Zymark TwisterMicroplate Handler requires adjustment under the following circumstances:• When changing sample block module formats• If the Plate Handler is having difficulty sensing plates• Optical plate (of the current sample block format)The dimensions of different plate formats can place different requirements on howthe Plate Handler grips plates. To ensure smooth operation of the AutomationAccessory, adjust the plate sensor switch when changing consumable formats.1. Power off the Zymark Twister Microplate Handler.PHYSICAL HAZARD. The Zymark Twister MicroplateHandler must be powered off at all times during the following procedure. Failureto comply can result in physical injury to the user or damage to the PlateHandler.2. Clear the switch position by turning the thumb wheel all the way to the Upextreme (as indicated on the side panel).Thumb wheelGR2014aPlate-sensor switch3. Begin the adjustment of the sensor switch:a. Grasp an optical plate by the sides, making sure not to place pressure in thecenter of the plate to deform it.b. Place the plate between the fingers of the gripper assembly and align it tothe middle of the centering device.c. While holding the plate in position, slowly turn the thumb wheel to lowerthe switch onto the reaction plate until the switch:– Contacts the top of the plate, and– Emits a soft, audible “clicking” noiseIMPORTANT! The sound emitted by the sensor switch is very faint and may bedifficult to hear. To make the adjustment easier, place your ear close to thesensor switch while making the adjustment and listen for the switch to engage.Applied Biosystems 7900HT Fast Real-Time PCR System and SDS Enterprise Database User Guide 7-37DRAFTSeptember 1, 2004 11:39 am, CH_Maintenance.fm