Thermo Fisher Scientific Alpha TDS 190 (In the process of updating the brand guideline & product image) - Manual (Page 32)

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Appendix 1: 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 2: Factory Defaults
Resetting the controller to factory default settings (See program P8.0) clears
all calibration data and most other setup functions.
The following settings will remain unchanged:
1.
Measurement range
2. Temperature compensation mode (ATC or MTC)
3. Temperature offset calibration value, if in ATC mode.
TDS Defaults
TDS range
Remains unchanged at last selected range
Set point 1 10% full scale / Hyst. 5% full scale / Low
Set point 2 90% full scale / Hyst. 5% full scale / High
TDS Factor 0.70
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
Temperature Coefficient 2.1 %
Normalization Temperature 25.0 o C
100 110 850 900
RELAY OFF
HYSTERESIS BAND
FORWARD DIRECTION
REVERSE DIRECTION
SP1 SP2
RELAY ON
SP1 Set to LO
SP2 Set to HI
ppm