eutech-instruments alpha ph 190 18 din phorp controllertransmitter Benutzerhandbuch

 

 

- 21 - 

 
P2.3: Set Hysteresis value 
Hysteresis prevents rapid contact switching if your value is fluctuating near the set 
point. Once activated, the relay will not return to resting position until the measured 
value has passed through the set point plus hysteresis value. 
 
Example: With a high set point of 10.00 and a hysteresis value of 0.5, the relay will 
activate at pH values above 10.00, but will not de-activate till the measured pH 
value decreases below pH 9.50. 
 
The hysteresis window can be set to any value within the range shown below: 

• 

pH mode: 0.00 to 2.00 pH 

• 

ORP mode: 0 to 300 mV 

 
1. 

Key in the password “022” as per procedure in Section 5. 

2. 

Press ▲ key once. The screen will scroll P2.0 and SP2. Press ENTER three 
times. 

3. 

The screen will scroll P2.3, HYS2, and current hysteresis value. 

4. 

Press the ▲ or ▼ keys to adjust the hysteresis value. 

5. 

Press ENTER to confirm and return to general Setup mode. 
Press ▲ and ▼ keys together (ESCAPE) to return to measurement mode.