C-Tech H1820, Product Manual, Page: 7 / 10

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
Press the “UNITS” to choose the needed pressure unit.

Press the “Max” to switch between the maximum and the minimum pressure.

“DIF” is identical with “SET”. Press “DIF” for some time accompanied by
℃/℉
and “MAX” to
designate the alarming value of vacuum pressure, and confirm by pressing “ HOLD ”.

Press “
℃/℉
” to switch the unit of temperature.
Mode
Divided into normal and monitoring mode
 The mode is normal When the device is turned on, and in short time press the “ HOLD button ”
for monitoring mode. Again short press it to exit the monitoring mode. Under the monitoring
mode, the temperature is showed normal, with the SET light on the screen flashing, Whose cycle
is 1 Hz. The buzzer sounds once every three seconds. If the current pressure is lower than the
designated pressure at this time, an alarm will run. In Which period, the backlight flashes and
the buzzer alarms continuously, whose frequency is 1 Hz. The alarming will automatically
disappear, or pressing any key, or automatically disappear after 30 seconds, when current
pressure is higher than the set pressure, and after that, the device is still in the monitoring mode.

Under monitoring mode or normal one, long pressing “ HOLD ” will enter the set screen of
alarming pressure, at Which time, SET lights for a long time with six “0” (000000) on the screen.
Decimal point will be displayed in light of the present unit, at which time the rightmost digit
flashes. At this preference, short pressing “SET” could switch the location of cursor. “Max” is for
digit plus and “
℃/℉”
is for digit minus. (set range 0-99kpa) Short press “ HOLD ” to exit and
reserve, whose designation value will be saved in single-ship micro-computer. During the process,
short press “Units” to exit the settings.
Calibration
Divided into four modes

Under normal mode, long press “HOLD” to enter calibration mode.

At this time lighting Cal, the upper row of digit exhibits 1, and short press the “HOLD button” to