Note that the timer would also eliminate power from the heaters and the
hydraulic pump during the cooling cycle.
F.
Fill the test cylinder with water by positioning the water supply valve to the "FILL CELL"
position. Water will flow into the test cell and air will be expelled from the loosened
thermocouple connection. When water begins to flow from the thermocouple
connection, tighten the thermocouple gland with a wrench. When water begins to flow
from the fitting on the test cell cap tighten the fitting.
G.
Apply pressure to the test cylinder by turning the "PUMP" switch to the "ON" position.
The pressure may then be increased by turning the air regulator clockwise until the
desired pressure is obtained. This pressure is indicated on the pressure gauge.
Pressure may be reduced by turning the regulator counter-clockwise and by slightly
opening the "PRESSURE RELIEF" valve.
APPLY HEAT TO THE TEST CELL
The Eurotherm Model 818 is the most important component of the temperature control
system and it is strongly recommended that operators carefully study the Model 818
instruction manual.
A.
Program the temperature profile you wish to perform into the Model 818 Controller.
B.
Turn the "HEAT" switch to "ON" to activate the heaters.
NOTE THAT THE PRESSURE WILL INCREASE SIGNIFICANTLY DUE TO THE
THERMAL EXPANSION OF THE WATER AND THE TEST CELL SHOULD BE
MONITORED CLOSELY UNTIL THE CURING TEMPERATURE IS ACHIEVED.
SOME OPERATORS SLIGHTLY OPEN THE "PRESSURE RELIEF" VALVE TO
HELP CONTROL THE PRESSURE DURING HEAT UP.
C.
The temperature controller will maintain the temperature schedule which was
programmed and upon termination of a test it is imperative that the "HEATER
SWITCH" is returned to the "OFF" position.
TERMINATION OF TEST
1.
After the cement has cured for the required amount of time the "HEAT" switch should
be turned "OFF".
2.
Immediately start the cool down procedure by turning the "COOLANT" switch to the
"ON" position. DO NOT release the test pressure until the temperature has been
reduced to a minimum of 200 degrees F.
