ABB S 751 / 3 DR-K50 2CDH781001R2577 S 751 DR/3 unit, 3 x single-pole

The AO2000-LS25 is an optical instrument for continuous in-situ gas monitoring in

stack, pipes, process chambers or similar and is based on tunable diode laser

absorption spectroscopy (TDLAS). The AO2000-LS25 utilizes a transmitter/

receiver configuration (mounted diametrically opposite each other) to measure the

average gas concentration along the line-of-sight path.

The measuring principle is infrared single-line absorption spectroscopy, which is

based on the fact that each gas has distinct absorption lines at specific

wavelengths. The measuring principle is illustrated in Figure 1-1.

The laser wavelength is scanned across a chosen absorption line of the gas to be

measured. The absorption line is carefully selected to avoid cross interference

from other (background) gases. The detected light intensity varies as a function of

the laser wavelength due to absorption of the targeted gas molecules in the optical

path between transmitter and receiver. In order to increase sensitivity the

wavelength modulation technique is employed: the laser wavelength is slightly

modulated while scanning the absorption line. 

The modular architecture of the AC 800PEC not only greatly

reduces the complexity of the overall system, but thanks to

redundant subsystems also provides increased reliability. In

the case of a problem in one subsystem, the main controller

switches over to the remaining subsystems, which are scaled

in such a way that the overall task can still be fulfilled. Should

the main controller fail, a second controller is available in hot-standby.

SST Profibus Interface Card / 5136-PFB-ISA WoodHead

Woodhead Molex 5136-RE-VME PROFIBUS INTERFACE CARD SST

WOODHEAD SST-PFB-GE NSNB

SST Woodhead ControlLogix SST-PB3-CLX Profibus Module

MOLEX SST-DN4-PCU-2 / SSTDN4PCU2 

MOLEX SST-PFB3-VME-2 / SSTPFB3VME2

5136-DNP-VME-4 / 4CHANNEL DEVICENET PRO VME INTERFACE, 0190-05731 / SST/WOODHEAD

Woodhead Interface ControlNet Card PLC Communication Module SST-5136-CN-VME

MOLEX WOODHEAD 5136-CN-PCI INTERFACE CARDS SST CONTROLNET CARD PCI 5V BUS

MOLEX SST-DHP-PCI / SSTDHPPCI 

SST-PB3-VME-1