eutech-instruments alpha do 1000 dissolved oxygen controllertransmitter Benutzerhandbuch

Operating Manual  

alpha DO 1000 

 

12

You can reach the Calibration mode directly from the 
Measurement mode by pressing the CAL key and 
entering the Calibration security code. You can also 
reach the Calibration mode from the Advanced Setup 
mode.  
 

If the units of measure is in mg/l (default), then the 
calibration is also carried out in mg/l. The Dissolved 
Oxygen Controller allows a one- or two-point calibration.  

 

1. Enter Calibration mode. While in the 

Measurement mode, push the CAL key and 
scroll to Calibration code “11”.  Push the 
ENTER key again. The upper and lower display 
reads “CAL dO”. 

2.  Press the ENTER key. Use the ▲ or ▼ keys to 

select 1- or 2-calibration points.  

3. For One-Point Calibration, only Hi-value 

calibration is possible. The probe is allowed to 
equilibrate in a solution containing 8.24 mg/l of 
dissolved oxygen. The “CAL” indicator flashes 
at the top, right-hand corner. When reading is 
stable, the “READY” annunciator comes on. 
Use the ▲ or ▼ keys to adjust the displayed 
value to the correct value. 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 the Lo-value first, usually zero 
oxygen solution. Immerse the probe in the 
solution (low levels of dissolved oxygen) and 
allow it to stabilise. When the reading is stable, 
the “READY” annunciator comes on. Use the ▲ 
or  ▼ keys to adjust the displayed value to the 
correct value. Press the ENTER key to accept 
the value. 

°

Cal

2-p

l

h

1.00

CAL

0.00

8.24

24.2