Metrohm NIRS Analyzer PRO - Manual (Page 11)

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wavelength range from 1100-1650 nm. (The optical switch may be heard moving when instrument
scans are taken, if the ambient noise level is low enough.)
2.3 Diode Array Spectrometer
The diode-array spectrometer is composed of 512
discrete InGAs detector diodes. It has no moving
parts.
The wavelength accuracy is intrinsically stable, and
requires no adjustment. Temperature is maintained
internally to assure consistent and accurate
response.
NOTE: There are no user-serviceable parts in the
Diode Array Assembly. Do not attempt to open,
disassemble, or service this unit. Any attempt at
service or opening will immediately void the
warranty.
Power Supply
This takes the incoming AC Mains voltage and steps it down to 24 VDC, as used by the instrument.
Cooling Fan
The fan circulates air internally to maintain consistent, controlled temperature to the spectrometer
and all internal components. This assures repeatable optical response.
Sampling Point
This may be either a Window Reflectance system (as shown here), a Fiber Optic Probe, or Direct
Light. The internal instrument interface is the same for all styles. A fiber optic bundle carries the light
to the sample. A small bundle carries the returning energy from the sample to the Optical Switch.
AC Mains Block
This is explained in the section on electrical Connection. All connections should be made in
compliance with local codes, by a qualified electrician. Always use safety lockout procedures when
performing electrical wiring.
Ethernet RJ-45 Connector
The Ethernet cable is plugged in on the instrument motherboard.
Control PCB
Instrument functions are controlled from this PC board. There are no user-serviceable items or
procedures in connection with this board.