User Guide

Operating Manual alpha DO 1000

4 OVERVIEW

4.1 Keypad and Display

4.1.1 Keypad

• Perform rapid calibration

• Allows entry to Set up mode

• Select individual functions within the function group of Set up mode

• Store input data in the Set up mode

• Start calibration in the calibration mode

• Select various function groups in the Set up mode.

• Set parameters and numerical values in sub functions of Set up mode

If pressed continuously, the setting speed increases

• Control the relays in the MANUAL function

• Return to the Measurement mode when both keys are pressed together

• Switch between AUTO and MANUAL relay operation using a code

• Display limit set-point values for the switch contacts in AUTO relay operation

mode

• Switch between RELAY A and RELAY B in MANUAL relay operation mode

4.1.2 Display

The LCD display features two numerical displays that show status messages and

measured values for easy, quick reference. The display provides short-text

information for setting parameters and configuration.

MEAS CALSETUPHOLD

ppmt

mg/l

ATC

READY

-8.8.8.8

-1.8.8.8

• HOLD: Relay position and current output are frozen

• SETUP: Set-up mode of function groups

• MEAS: Measurement mode

• CAL: Calibration mode of Dissolved Oxygen

• READY: Comes on after a successful calibration

• ATC: Comes on in the ATC mode. Disappears in the

Manual temperature Compensation mode. “ATC” flashes

if the temperature probe is faulty in its ATC mode

• Display for RELAY A/B. Green LED indicates measured value within limit while RED

LED indicates measured value outside limit.

• Alarm display if limit value overshoot or the ATC connection is broken.