Analyzer overview/Theory of operation: [later]
The NGA modular analyzer “shoebox” concept was developed in the 1990’s by the LaHabra / Anaheim division of Rosemount Analytical. Rosemount made a universal platform that acted as the gateway (control) to all of the ‘blind’ physics modules that may be attached to it. The physics (shoebox analyzers) ran the gambit of NDIR, paramagnetic, FID, HFID, Wet CLD, and CLD (chemiluminescence). By far, the CLD module is the most compact of the analyzers and the hardest to work on (in my opinion).
Over the years the NGA2000 morphed in to the MLT (Rosemount Germany) … and then in circa 2021, Rosemount (Hasselroth) Germany was shuttered (closed).
As of this writing November 17, 2023 the NGA-CLD analyzer status is NLA (no longer available). However, RIGAS can still get most parts for the NGA-CLD.
[later] Analyzer datasheet – Downloadable
[later] Analyzer manual – Downloadable
[later] Installation detail/Footprint
[later] Front Panel
[later] Back Panel
[later] Flow diagram
[later] I/O – Interconnect diagram
[later] List of parts common for service/rebuilds
[later] List of parts common for repairs/replacements
See linked PDF for a discussion about ozone (O3) starvation (usually caused by diminishing UV output from the ozone lamp). CLD_NOx_ozone_starvation_response_graph_discussion.pdf
[later] a discussion of chemiluminescence
See linked PDF for a discussion about ozone starvation (usually caused by diminishing UV output and therefore lessoning O3 production from the ozone lamp). CLD_NOx_ozone_starvation_response_graph_discussion.pdf
The designer of this analyzer failed on two major points:
Fix / upgrade / resolution:
If you’ve stumbled on to this FAQ, you must have a Rosemount NGA-2000 CLD analyzer to measure NOX either dry or wet (referring to the WCLD version). The detector portion of this analyzer is OEM p/n: 659754 (obsolete) and is sold by us under this part number: 35K0104R0. It is the same OEM detector and fully compatible with your NGA-2000 or uCEMS.
I’d like to point out that this detector assembly is COMPLETELY repairable and should never be chucked in to the dumpster. Here’s why:
We’ve been fixing about two of these per year for the past 20 years. Don’t listen to the rumors that you can’t procure a NGA-2000 CLD detector assembly, we can get them or repair them.