Fisher Scientific 282A, Инструкция по эксплуатации, Страница: 15 / 25

14
8 Temp: OFF
Pump: OFF
Time: 3:00 PM Temp: OFF
Pump: OFF
Time: 1:00 PM Temp: OFF
Pump: OFF
Time: 1:00 PM Temp: OFF
Pump: OFF
Time: 3:00 PM Temp: OFF
Pump: OFF
Time: 3:00 PM Temp: OFF
Pump: ON
Time: 12:00 AM Temp: OFF
Pump: ON
Time: 12:00 AM
The default settings for any step are: TEMP- OFF, PUMP- OFF, and TIME- 12:00 AM. The outlined areas above
indicate actual program editing. Notice the final step programmed for each day is copied through to the end of
that day. This was accomplished by selecting Y (yes) at the ‘
?’ menu (see MENU6, Step 6).
Program Execution Enabling/Disabling
To execute a program, press the MENU key until the upper display shows PGRM. Press the UP key to display ON,
then press SET or wait 2 seconds and control will return to the default mode automatically. The program will then
search for the current day and begin execution at the most recent step.
To stop program execution, press the MENU key until the upper display again shows PRGM. Press the DOWN
arrow key to display OFF, then press SET or wait 2 seconds for the program to stop automatically.
CALIBRATION PROCEDURES
The Model 282A Isotemp® Vacuum Oven is carefully calibrated before leaving the factory. However, re-calibration
will be necessary when component parts are repaired or replaced. This is especially true regarding the vacuum
readout system. In fact, it may be necessary to re-calibrate this system if critical vacuum levels are required to
meet particular applications due primarily to altitude and atmospheric conditions.
Calibration Mode
Follow the instructions below to access the calibration mode:
1. Set the POWER switch to the OFF position.
2. Remove the right side panel from the Model 282A.
NOTE: Refer to instructions for removing the side panel on page 9 before proceeding.
3. Locate two sets of jumpers on the back of the control board labeled JP4. To enter the calibration mode,
remove the bottom jumper and place it across the bottom pins as shown in Figure 2, page 5.
4. Set the power switch to the ON position. The upper display will show INIT, which is the first calibration menu.
By pressing the MENU key repeatedly, all calibration menus can be viewed in the upper display. Table 8
summarizes the calibration menus.
NOTE: Any part of the calibration can be conducted individually without altering data from the others.
5. To abort a calibration and return to the control mode, simply set the power switch to the OFF position and
remove JP4 before completing a calibration. The previous calibration data will not be affected.
Table 8: Calibration Menus
Prompt Calibration Routine Comments
INIT Initialize data memory. Four options. Selectively clears data variables,
program and clock. Resets all calibration data to
defaults.
TCCB Measure and Control
thermocouple calibration. Requires two temperature points (T2 – T1) >
100°C. temperature control loop is on during
calibration.
VCMC Pressure sensor. Requires two pressures, ambient plus second point
near 0 in Hg.
D/AC Temperature and vacuum
recorder outputs Adjust full scale. Temperature, vacuum inputs not
required.
CJCD Cold junction compensation
temperature Display for verification only. No adjustment