Hach 900 MAX Section, Keypad Description, Liquid Crystal Display, Numeric Keypad, “Soft” Keys

Section 1

1.2.1 Keypad Description

The keypad includes the numeric keypad, soft keys, and function keys.

Numeric Keypad

The numeric keypad consists digits 0 through 9, a +/- key, and a decimal key.

“Soft” Keys

Soft keys are blank, white keys located to the left and right of the display. If no function is shown for a specific key, that key is not currently active. The soft key labels appear on the display and indicates (with a straight line) the proper soft key to push for that action.

In some cases during a programming step an item from a list needs to be selected. The soft keys on the right side of the display will change to display UP and DOWN arrows. Scroll through the list of choices.

Power ON/OFF Key

To turn the instrument on, press the ON key. When the instrument is turned on, a green light located next to the ON key flashes to indicate that the sampler power is turned on. To turn the instrument off, press the OFF key.

Function Keys

Three white function keys (Table 1) are located just above the numeric keypad re used often while operating the sampler. These functions are dedicated keys to allow quick access.

Table 1Function Key Descriptions

Function Key

Main Menu

Description

This is the starting point to get to any other point in the program. Press the Main Menu key at any time during programming to return to the Main Menu Screen. The current action is cancelled if changes are not yet accepted.

Manual Mode

Manually controls the operation of the sample pump and the distributor arm.

ADVANCED DISTRIBUTOR soft key: Moves the distributor arm to the user selected bottle. Used to verify the operation of the distributor or when repositioning the arm if it was moved by hand.

GRAB SAMPLE soft key: Takes a sample in the same manner as when a program is running. Includes all pre-rinses and sample retries, if programmed.

PUMP OPERATION soft key: Allows manual control of the pump in both forward and reverse directions. Once started, the pump is stopped by pressing any key.

Run/Stop

Runs (or resumes) a program and stops a currently running program.

1.2.2 Liquid Crystal Display

The liquid crystal display (LCD) works in conjunction with the four soft keys.

When a soft key changes function, the display shows the new function.

Menu Bar

The Menu Bar appears in a black band on the top edge of the display. The upper left corner of the menu bar shows the time and date. The upper right corner shows the name of the current menu (Figure 1).

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