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ENVIRONMENTAL SENSOR TECHNOLOGY CO. INC.
Among them, the LCD screen is used to display the gas concentration, time and various
information parameters. The two LED lights on the top are alarm lamps, which flash
alternately when the gas alarms. The LED at the left side of the bottom of the LCD is the
power light, which is green and lights when the battery voltage is not enough. While the LED
at the right side is the communication light that becomes red and flashes once when
communicating one set of the data (applicable for EST-2000 series only).
The five buttons on the panel respectively are Power/Confirm, Menu/Shift, Back, Plus/Up and
Minus/Up.
1. Power/Confirm: long press (for about 3 seconds) facilitates the power and the instrument
switches the on-and-off machine. Short press facilitates the Confirm.
2. Menu/Shift: after booting, long press (for about 3 seconds) facilitates the menu to enter the
menu mode. Short press facilitates the shift.
3. Back: long/short press will both facilitate the Back and it will return to the last menu or exit
the menu mode.
4. Plus/Up: add a displayed unit to the value or turn upward for an option. Long press
facilitates the continuous operation.
5. Minus/Up: reduce a displayed unit to turn downward for an option. Long press facilitates
the continuous operation
In addition, there is a power connector on the left side of the product and the battery is
installed in the back cover of the product. The parts and names of the products are shown in
the following figure.