User Guide

Operating Manual alpha DO 1000

annunciator comes on. Press ENTER key to accept the value and the

controller displays the status of the probe.

4. For Two-Point Calibration, calibration is carried out at 0% saturation first.

Immerse the probe in solution and allow it to stabilise. When the reading is

stable, the “READY” annunciator comes on. Press the ENTER key to

accept the value.

Note: If the displayed value is > ±5% of the theoretical value, the

controller will not accept the zero calibration and retains the

previous calibration values.

5. If the calibration is successful, the controller switches to the second point,

100% saturation. Take the probe out of the zero solution, rinse in clean

water and calibrate in air. When the reading is stable, “READY”

annunciator comes on. Press ENTER key to accept the value and the

controller displays the status of the probe.

Note: If the displayed value is > ±30% of the theoretical value, the

controller will not accept the high-level calibration and retains the

previous calibration values.

6. After calibration to a second value, this controller will automatically display

condition of the probe in the upper display and the temperature in the

lower display. You can view these values without calibration --- see section

5.1.1 for instruction. The probe condition is re-determined after each

calibration.

7. Press the ENTER key. If you entered the calibration mode using the CAL

key, the controller will return to the Measurement mode. If you entered the

calibration mode from the Advanced Set-up mode, the controller will return

to the sub-function menu.

Note: If there is a calibration error, the controller displays “ERR”. If

this happens, push both the ▲ and ▼ keys (escape) to restart

the calibration beginning from step 1.

Note: When calibrating with manual temperature compensation, the

controller automatically changes from the preset process

temperature to the calibration temperature. After leaving the

Calibration mode, the controller switches back to process

temperature (for setting the calibration temperature and the

process temperature, see section 7.4.3).