Hach EC1000 Instruction Manual page 19

Item Name
1 LED Display Main display field. Consists of eight 14-segment alpha-numeric 0.54" high red LED characters.
During normal operation, this field displays either the pH or mV value (depending on the mode of
operation selected). This field also displays menu messages, edit menu values, and error messages.
See Figure 1 .
2 Secondary The secondary display field consists of three 7-segment numeric 0.3" high green LED digits.
Display Field During normal operation, this field displays temperature. In the setup menu, this field displays
abbreviations to help indicate which branch of the setup menu the operator is in. See Figure 1.
3 SETUP key This key enters the setup menu. The setup is entered when it is pressed.
4 pH/mV key During normal operation (instrument displaying pH/mV), this key toggles the reading between
pH and mV. If the instrument is in any of the menus, pressing this key returns the instrument to
normal operation.
5 ENTER key This key, within the menus, either moves a level deeper into the menus, or accepts an edited selection.
6 CLEAR key This key, within the menus, either clears changes in an edit portion of a menu, or backs up one menu
level. If this instrument is in an edit portion of a menu selection, and the value is changed, then this key
restores the original value. Otherwise, this key causes the menu selection to back up one level; if the
menu is at the top level, this key returns the instrument to normal operation (instrument
displaying pH/mV).
7 RIGHT This key, in an edit portion of a menu selection, selects the next digit to the right to edit. The selected
ARROW key digit flashes. When the instrument is in one of the non-editing portions of the calibration/setup menus,
or in normal operation (instrument displaying pH/mV), this key is not valid; if pressed, an INVALID
message flashes on the main display.
8 HOLD/DOWN During normal operation (instrument displaying pH/mV), this key functions as a hold. When pressed,
ARROW key the outputs (alarm relays, recorder, and controller outputs) alternately hold at the current value, or
release to normal operation. When the outputs are held, the first character in the main display
flashes an H. ( Note: The H appears only during normal operation; in the menus, the H does not
appear. ) After the outputs are in the hold state for 30 minutes, they automatically release. When
the instrument is in one of the calibration/setup menus, this key scrolls down through the menu
selections. When the instrument is in an edit portion of a menu selection, this key decreases the
selected (flashing) digit.
9 ALARM ACK/ During normal operation (instrument displaying pH/mV), this key functions as an alarm acknowledge.
UP ARROW When pressed, the alarms are alternately disabled or enabled. When the alarms are disabled, the
key three alarm indicators flash, and the alarm relays are in the non-alarm state. After the alarms are
disabled for 30 minutes, they automatically enable. When the instrument is in one of the
calibration/setup menus, this key scrolls up through the menu selections. When the instrument is in an
edit portion of a menu selection, this key increases the selected (flashing) digit.
10 CAL key This key enters the calibration menu. From this menu, the pH electrode, temperature probe, and mV
offset can be calibrated, and the calibration reviewed.
11 System warning Red LED. Indicates a probe failure or controller malfunction. Refer to Table 4 on page 42 for specific
system warnings that appear on the main LED display. For most system warnings, the user must query
the system to determine the warning. See Figure 1 .
12 Alarm 2 Red LED. User programmable setpoint alarm. See Figure 1.
13 Alarm 1 Red LED. User programmable setpoint alarm. See Figure 1.
Table 1 Controller Front Panel
Function
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