MTS Model 680-01 High-Temperature Grips - Manual (Page 38)

Model 680.01 High-Temperature Grips 38
Hydraulic power will be applied to the systems hydraulic actuator during the
following steps.
This can cause personal injury and/or equipment damage.
Exercise caution to avoid having your hands pinched while working near the load
unit while hydraulic pressure is applied. If a high-temperature furnace is installed
in the load unit, exercise extreme care to prevent the actuator from applying any
force to the furnace; severe furnace damage will occur even if minimal force is
applied to the furnace.
5. Apply low hydraulic power to the system.
6. Place the two halves of the other specimen adapter around the lower end of
the specimen and hold in place.
7. Select force control and adjust the actuator until the lower grip’s extension
just contacts the lower specimen adapter.
Note When force control is selected to control the actuator and the force
command is set to zero, the actuator will automatically move the proper
amount when you screw the specimen into the specimen adapter.
8. While holding the lower specimen adapter in place, screw it into the lower
grip extension until the adapter is fully threaded into the extension. This
may be done by rotating the specimen adapter or the extension. (The
extension has wrench flats for a 1-1/8 inch open-end wrench.)
9. When satisfied that the specimen is properly installed (specimen adapters
fully screwed into grip extensions), actuate the hand-operated pump until
the required hydraulic pressure is shown on the pressure gage.
Adjust the Water Flow
Water flow through the grips must be sufficient to prevent damage to the grips.
Minimum cooling water requirements are for 4 L/min (1 gpm) flow at 2.75 Pa
(40 psi). Fully open the water flow control valves. The temperature of the outer
surface of the grip body should not exceed 121°C (250°F) under any
circumstances.
WARNING