eutech-instruments alpha ph 200 phorp controllertransmitter Manuale Utente

- 14 - 

This controller features selectable Automatic Temperature Compensation (ATC) or 
Manual Temperature Compensation (MTC). 
 
ATC: ATC mode requires a Pt 100 temperature element. ATC automatically 
compensates for temperature fluctuations. You can offset your ATC temperature 
reading by ±10

o

C. 

Important: If there is no temperature element wired to the controller and ATC is 
selected on, the screen will flash in pH or ORP mode, and you will see an error 
message (OR) in temperature mode. 
 
MTC: MTC lets you select a specific value at which temperature will be 
compensated. You can select a manual temperature value from – 10 to 110

o

C. 

Factory default is 25.0

o

C. 

 
See Setup program P3.3 for instructions on ATC or MTC selection. 
 
To offset temperature: 
1. 

Press MODE to select 

o

C mode. The display shows MTC or ATC, then the 

temperature. 

2. 

Key in the password “011” as per procedure in Section 5. 

3. 

The screen will flash the current 

o

C reading. 

4. 

For ATC: Determine the temperature of your solution with an accurate meter 
(such as the Temp 5). Press the ▲ or ▼ keys to offset the 

o

C value on the 

controller display to match the value of the solution you are measuring. 
For MTC: Press the ▲ or ▼ keys to offset the 

o

C value on the controller 

display to match the desired value. 

5. 

Press ENTER. The display flashes “DONE”. Press ENTER again to return to 
measurement mode. 

 

22.5

25.0

done