SICK GM35 User Manual

19
8009389/YN39/V3-0/2015-08| SICK OPERATING INSTRUCTIONS|GM35
Subject to change without notice
PRODUCT OVERVIEW
2.2 Functional principle
2.2.1 Opto-electronic in-situ measuring principle
The Gas Analyzer with Measuring Probe GM35 is based on in-situ technology with opto-
electronic direct measurement. Measured values are recorded through no-contact
measurement directly in the gas flow across the entire duct cross-section (cross-duct). The
GM35 SR-unit determines the concentration of the respective gas component based on
wavelength-specific light absorption by the gas mixture in the active measuring path.
Fig. 5: Optics layout of the GM35
The beam from the sender/receiver unit (SR-unit) passes lengthwise through the active
measuring path (
see page 26) and is reflected by the reflector at the other end. The
reflected light from the beam splitter then passes through a filter or cell wheel to detectors
configured optionally to measure CO or N
2
0 as well as CO
2
and H
2
O. By filtering the light
received into its spectral components, the receiver elements record the absorption of the
gas molecules at characteristic points of the spectrum in the IR range of 1.6 to 4.9 µm.
Reflector of
the measuring
probe
Front window of the SR-unit
Measuring path in the gas
duct (Measuring gap or
diffusion filter depending on
the probe)
Deflection mirror
Filter wheel and detector for
CO
2
and H
2
O
CO detector
Cell wheel CO/N
2
Filter for CO measurement
Visor with opto-electronic adjustment tool
IR transmitter
lamp
Chopper
Lens mirror Reference filter pivot segment
Beam splitter
Zero point reflector
and blanking
diaphragm

SICK GM35 Specifications

General

Brand	SICK
Model	GM35
Category	Measuring Instruments
Language	English