Thermo Fisher Scientific Alpha pH 190 (In the process of updating the brand guideline & product image) - Manual (Page 26)

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P1.3: 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 low set point of 4.00 and a hysteresis value of 0.5,
the relay will activate at pH values below 4.00, but will not de-
activate till the measured pH value rises above pH 4.50.
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. The screen will scroll P1.0 and SP1. Press ENTER three
times.
3. The screen will scroll P1.3, HYS1, 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.