DHR Series Getting Started Guide Page 25
• Bearing lock: Applies a software lock to the bearing to prevent the instrument’s shaft from rotating.
This lock is over-ridden when the experimental procedure starts. A continuous red light indicates the
bearing is locked. Pressing the button when the bearing is locked releases it. If the button is pressed for
3 seconds, the bearing rotates to its “home” position and then locks. This is indicated by a flashing red
light. The “home” position is used when fitting a geometry.
• Start: Used to start an experimental procedure. When the button illuminates green, pressing it starts the
current active experiment in TRIOS. If the geometry is not at the measurement gap, the gap automati-
cally closes before starting the experiment.
• Stop: Terminates whatever operation the instrument is performing, for example finding the gap zero,
mapping the bearing or running an experimental procedure. A flashing red light indicates that a
measurement is in progress.
• Release: Used as the Smart Swap release button.
• Cycle display: Used to display alternative screens on the instrument’s user interface.
Smart Swap™
The Discovery Series rheometers feature “Smart Swap” technology that automatically senses the tempera-
ture control system present and configures the rheometer operating software accordingly, loading all rele-
vant calibration data. The use of this feature is covered in this manual.
Also standard across the entire range are Smart Swap™ geometries. These geometries can be automati-
cally identified when installed on the rheometer. The magnetic coating on the head of each geometry pro-
vides the read/write technology that will uniquely identify it to the instrument.
Auto GapSet Mechanism
The auto GapSet facility has four major functions, as follows:
• Automatic setting of gaps via software
• Programmed gap closure
• Thermal gap compensation
• Axial force control (in conjunction with the axial force transducer)
These features of the GapSet mechanism are described in detail in the TRIOS Software Online Help.
True Position Sensor
No motor is 100% efficient, so there is always heat generated as a by-product of torque development. This
can result in thermal expansion of components within the motor/bearing. An inductive linear position sen-
sor located at the point the drive shaft exits the motor housing measures movement due to thermal expan-
sion and makes a real-time adjustment to the geometry gap. The True Position Sensor is standard on all
DHRs and is always active. It works with all geometries and environmental systems.
The performance of the True Position Sensor is enhanced by using the motor water cooling option. The
water flows though a channel in the motor carriage casting before routing through the motor core. This
provides a thermal break and is particularly effective when using environmental systems such as EHP and
ETC.
NOTE: The water cooling is optional, but recommended during high-torque, long-lasting test procedures.
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