Thermo Fisher Scientific Alpha pH 200 (In the process of updating the brand guideline & product image) - Manual (Page 36)

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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