Instruction manual

NGA 2000 MLT Hardware
REPLACEMENT AND CLEANING OF PHOTOMETRIC COMPONENTS
17 - 8
Emerson Process Management GmbH & Co. OHG
Instruction Manual
90002929
07/2006
17.5 Physical Zeroing
Adjustment of the physical zero - level will only be required if a light source, a filter cell, or an analysis
cell have been replaced or repositionned.
Needed for the adjustment is a 3 mm hexagon wrench SW 3.
❍ Switch on the analyzer (cf. Section 6.).
❍ Admit zero gas to the instrument.
❍ Slightly loosen the light source mounting screws (shown in Fig. 17-2 as Item 1) for
correspondend channel.
❍ Set the raw signal [(press "Status" (F2) → "RawMeas." (F2)] precisely to ± 100.000 counts
by turning the corresponding light source.
❍ Tighten the light source mounting screws (shown in Fig. 17-2 as Item 1) for correspondend
channel.
If the turning of the light source is not sufficient, the zero point can be adjusted by sliding the zero
point diaphragm at the downer side of the detectors adapter (Fig. 17-4).
When the physical zeroing has been correctly set, perform an electrical zeroing (see software
manual).
PHYSICAL ZEROING