Raman Rxn2 Operating Instructions
Endress+Hauser 33
7.4.1.2 Laser interlock circuit
If an interlock in a fiber cable breaks, the laser output for that channel is disabled. Other channels with intact fiber
interlocks will continue to have the laser available to them.
For laser output to occur on a channel, a probe and remote interlock shorting plug, Endress+Hauser p/n 70193450,
must be installed to their respective connectors.
Auxiliary interlock laser emission indicators are located on the probes. See the specific probe operating instructions
for more information.
7.4.2 Spectrograph
The spectrograph includes the optical elements used to filter out the Rayleigh scatter and focus the Raman scatter
onto the detector. The spectrograph assembly (which includes the detector) in the Raman Rxn2 is contained in a
sealed assembly and has no user-serviceable parts.
7.4.3 Calibration switching module
The calibration switching module (CSM) is a key component of the Raman Rxn2. Using high-reliability switches, it
routes the several channels and performs automatic wavelength calibration with a neon source and laser wavelength
calibration with an internal Raman shift standard. It also contains a software-controllable shutter for the laser.
The neon lamp provides a broad spectrum of lines for wavelength calibration across the Raman spectrum. The neon
lamp also is not susceptible to spectral shift with changes in temperature or pressure as are calibration protocols that
rely on Raman bands.
The calibration can be performed on the internal neon lamp without reconfiguring the analyzer to accommodate an
external calibration unit. The internal Raman shift standard allows the laser wavelength to be tracked.
Because the calibration light source is internal to the Raman Rxn2, it is susceptible to interference from stray light
entering the connected probes. Prevent stray light from entering any probe connected to the base unit by covering
the ends of any attached probes that are not being used.
Refer to the Software operation chapter of the Raman RunTime Operating Instructions (BA02180C) for more
information on calibrating the Raman Rxn2 analyzer.
7.4.4 Fuses
There are no fuses to replace on the Raman Rxn2. The Raman Rxn2 is powered by a special adapted advanced
technology extended (ATX) power supply, which has no external fuses. If a short circuit were to occur inside the
Raman Rxn2 it would be on the DC output side of the power supply. In this event, the power supply would turn itself
off and the user must manually reset the power by removing the plug for 5 minutes after the source of the short
circuit is resolved.
7.4.5 Mobile cart accessory option
An ergonomic mobile cart/trolley is available as an option for all Raman Rxn2 configurations. The Raman Rxn2 with
mobile cart model includes the Raman Rxn2 embedded analyzer, built-in probe and optic storage, a routine-analysis
sample compartment, and fiber storage. For connecting main power to the mobile cart, an integrated internationally
approved pigtailed power cord is provided.
The pigtail incorporates a standard IEC-320 C-14 inlet to which any standard and locally approved power cord with
an IEC-320 C-13 plug may be attached to provide mains power to the cart accessory. The mobile cart accepts AC
power from 100 to 240 V and 50/60 Hz. Internal to the mobile cart, all mains power is distributed to the Raman
Rxn2 base unit, touchscreen monitor and optional calibration accessory using an internationally approved power
distribution strip with internationally approved cordage.
For mobile cart options sold within the continental United States, an approved 3 m (39.4 in) power cord is provided
with the mobile cart for attachment to mains power. For mobile cart options sold outside the continental United
States, a power cord is NOT included. It is the responsibility of the end user or local distributor to provide a locally
approved power cord for attachment to mains power.
See the Raman Rxn Mobile Cart Operating Instructions (BA02175C) for more information.
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