Endpoint Formats - Mettler Toledo SevenGo Duo pro SG78 Instrucciones De Manejo

T1: Typical sample temperature
T2: Reference temperature
GT1: Measured conductivity at typical sample temperature
GT2: Measured conductivity at reference temperature
Non-linear
The conductivity of natural water shows strong non-linear temperature behavior. For this reason, use the
non-linear correction for natural water.
The measured conductivity is multiplied by the factor f
and thus corrected to the reference temperature of 25 °C:
G = GT · f
T25
If another reference temperature is used, for example 20 °C, the conductivity corrected to 25 °C is divid-
ed by 1.116 (see f
GT = (GT · f
20
Note
Conductivity measurements of natural water can only be performed at temperatures ranging from 0 °C to
36 °C. Otherwise, the warning message "Temp. out of nLF correction range" appears.
3. TDS factor
TDS (Total dissolved solids) is calculated by multiplying the conductivity value with the TDS factor. A
fac tor between 0.40 and 1.00 can be entered.

6.8 Endpoint formats

Auto
With the automatic endpoint the selected stability criterion determines the end of an individual reading
depend ing on the behavior of the sensor used. This ensures an easy, quick and precise measurement.
a) Place sensor in the sample.
b) Press READ.
A appears on the display.
The measurement ends automatically when the measured value is stable.
If READ is pressed before the signal is stable, the endpoint format changes to manual .
Manual
Unlike Auto, user interaction is required to stop the measurement reading in manual mode.
a) Place sensor in the sample.
b) Press READ.
M appears on the display.
c) Press READ to end the measurement.
Timed
The measurement stops after the set time, which can be set between 5 s and 3600 s.
a) Place sensor in the sample.
b) Press READ.
T appears on the display.
The measurement ends automatically when the set time period expires.
If READ is pressed before the signal is stable, the endpoint format changes to manual .
Information on the display
The following symbols appear in the display, depending on the endpoint setting.
pH/ORP/Ion/Conductivity meter SG78
25
for 20.0 °C)
25
)/1.116
25
appears on the display to signalize measurement stability.
appears on the display to signalize measurement stability.
for the measured temperature (see "Appendix")
25
appears.
Menus and settings
appears.
appears.
25