Chandler Engineering AMETEK 7200, Инструкция по эксплуатации

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2-8 SECTION 2 – OPERATING INSTRUCTIONS
Calibration menu
These menu items will open the Calibration window for the selected sensor. For more details,
see
Section 4 - Calibration of this manual.
Help menu
Index
This menu item opens the Help file.
About
This menu item opens the About screen, showing the CHA-Control software copyright
message, date, and version number.
Main screen controls and indicators
Oven Temperature
The Oven Temperature is displayed on the main screen, as measured by the oven
temperature c ontroller’s thermocouple . Below that is a Set Point control which you can use
to remotely change the oven temperature set point of the controller. Either use the arrows to
increase or decrease the set point, or type in a value in the box. The software will not accept
and make use of the new value until you either click somewhere else on the screen or use the
ENTER key on the
computer’s keyboard . To turn off the oven heating, enter a Set Point of
0.0°C.
Cabinet Temperature
The Cabinet Temperature displayed on the main screen is the temperature inside the
instrumentation cabinet, as measured by an RTD. Since the CHA uses very-low-flow-rate
flow meters to measure gas injected (
N
2
Flow Rate ) and to indicate the relative
expansion/contraction of the cement ( H
2
O Flow Rate ), room temperature changes could
affect the measurements by causing drift in the flow meters’ output signals. Th is is prevented
by keeping the doors of the instrumentation cabinet closed, allowing time for the Cabinet
Temperature to reach equilibrium as the nearby oven heats up to test temperature, and if
necessary, then rezeroing the N
2
Flow Rate and H
2
O Flow Rate , using the drop-down menu
items Calibration … Gas Injection Flow Rate and H
2
O Confining Flow Rate .
Cement Temperature
The Cement Temperature displayed on the main screen is the temperature inside the
cement sample being tested in the CHA vessel, as measured by an RTD. This temperature
provides an indication of the hydration/curing process of the cement during the test, and is
used to measure when the cement sample has reached the desired test temperature and begin
pressurization of the sample.
Pore Pressure
The Pore Pressure indicator monitors the pressure at the top of the cement sample column in
the CHA vessel, giving an indication of the stage of hydration/curing of the sample, and
whether or not any injected gas has migrated from the bottom of the sample, through the
sample and up to the top.