Delta NANOTRACE DF-745 Instruction Manual download pdf (Page 43)

User Interface DF-745 39

Figure 25: Calibrate Menu

7.4.3.1 Check/Adjust Zero

Figure 26: Check/Adjust Zero Menu

The Check/Adjust Zero screen displays many pieces of information including a live reading

of moisture in ppb (or ppm) and the state of the zero gas control valves. Also depicted are

Zero Reference and Zero Offset values.

The Zero Reference value is a reflection of the deviation of the instrument’s baseline from

what was set at the factory. The zero reference of an instrument from the factory will be

0.00. After a manual or auto zero is performed, this value may change slightly.

If the moisture cell has been previously calibrated by the user, Restore Factory Zero will

be enabled on this screen. Enacting this will erase any user zero and restore the factory set

point.

The User Zero Offset and Active Zero Offset are two mechanisms to modify the zero

baseline. When the Active Zero feature is turned on, the User Zero Offset display is

inactive and Active Zero Offset will be displayed instead. See page 57 for additional

information on the Active Zero feature.

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Delta NANOTRACE DF-745 Instruction Manual Page 43