Thermo Fisher Scientific Alpha pH 190 (In the process of updating the brand guideline & product image) - Manual (Page 40)

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Appendix 2: Simple Explanation on the Function of Hysteresis
The controller relay activates
when the set-point is reached.
In the reverse direction, it does
not de-activate when the value
reaches the set-point. Instead,
it continues to be active till the
value reaches the amount set
by the Hysteresis band.
Appendix 3: Factory Defaults
Resetting the controller to factory default settings (See program
P6.0) clears all calibration data and most other setup functions.
The following settings will remain unchanged:
1.
Measurement mode (pH or ORP)
2. Temperature compensation mode (ATC or MTC)
3. Temperature offset calibration value, if in ATC mode.
pH Defaults
pH input
Asymmetrical
offset 0.0 mV
slope 59.2 mV
Set point 1 pH 4.00 / LOW / Hysteresis pH
1.00
Set point 2 pH 10.00 / HIGH / Hysteresis
pH 1.00
mV Defaults
mV input
Asymmetrical
offset 0.00 mV
Set point 1 - 100 mV / LOW / Hysteresis 5
mV
Set point 2 900 mV / HIGH / Hysteresis 5
mV
Temperature Defaults
Temp. Compensation
mode
remains unchanged
MTC mode reset to 25 o C if in MTC mode
ATC mode remains at last calibration if in
ATC mode
4.0 4.5 9.5 10.0 7.0
RELAY OFF
HYSTERESIS BAND
(DEFAULT = 0.5 pH)
FORWARD DIRECTION
REVERSE DIRECTION
SP1 SP2
RELAY ON
SP1 Set to LO
SP2 Set to HI