La relación del principio de confianza con otros criterios utilizados para determinar el deber objetivo de cuidado o la creación de un para determinar el deber objetivo de cuidado o la creación de un

Note: Take into account that the intensity of the water vapor band in the sample spectrum does not depend on the absolute residual water vapor concentration but results from a water vapor concentration difference during the background and the sample measurement.

With the above described operation conditions and a spectral resolution of 4cm-1, typi- cally a residual water vapor band intensity in the range of significantly less than 0.1%T can be achieved.

. . . .

P U R G I N G T H E S P E C T R O M E T E R

G e n e r a l I n f o r m a t i o n

Purging the spectrometer is not necessarily required, especially when you perform measurements under vacuum conditions. However, if the spectrometer is not evacu- ated, purging is recommended, especially when you frequently open the compartment covers (e.g. due to a detector or beamsplitter replacement or a sample substitution) or if the ambient air humidity content is too high because this measure reduces the level of water vapor, CO₂ or other components of the ambient air inside the spectrometer.

Note: Water vapor, CO₂ and other atmospheric contaminants cause

unwanted absorption. Therefore, open the sample compartment, the detector compartment and/or the interferometer compartment only if necessary in order to prevent water vapor, CO₂ or other contaminants from entering the above mentioned compartments.

Figure 27: OPUS Measurement dialog

Specifying the measurement delay time

5

Purging the Spectrometer

Purge the spectrometer, for example, with dry air or low pressure nitrogen gas. Provide the following purge gas conditions:

•

Dry (dew point < -40°C corresponds to a degree of dryness of 128ppm humidity), oil-free and dust-free air or nitrogen gas

•

Maximum pressure of 2 bar (29 psi)

•

Initial purge gas flow rate should not exceed 500 liters/hour

•

Sustained purge gas flow rate should not exceed 200 liters/hour

Danger: Do not use flammable gases for purging the spectrometer. Some spectrometer components become very hot during operation. If flammable gases come in contact with hot components there will be the risk of fire and/or explosion!

For information about how to connect the spectrometer to a purge gas supply line, refer to chapter Installation.

If you want to purge an enclosed accessory (e.g. micro ATR unit) you have to cover the opening, which is also intended for evacuating and venting the sample compartment (see figure 28), using the supplied cap in order to ensure a sufficient purge of the accessory. Put the cap over opening and screw on the cap.

Attention: If you want to perform measurements under vacuum conditions do not forget to remove this cap again! Otherwise, the evacuation of sample compartment via the small purge gas inlet in the Quick- Lock clamping device (figure 28) will take too long causing a red VACUUM LED after a certain period of time.

This opening is intended for evacu- ating, venting and purging the sam- ple compartment.

Purge gas inlet for purging an enclosed accessory mounted on a QuickLock baseplate

Figure 28: Sample Compartment

. . . . .

Purging the Spectrometer

C o n t r o l l i n g t h e F l a p s

VERTEX 70v is primarily designed for vacuum operation, but it can be purged as well. To activate the purge mode, select in the OPUS Measure menu the Optic Setup and Service function. Click on the Devices/Options tab and make sure that the Purge Mode check box is activated. See figure 29.

This operating mode allows you to control (open and close) the flaps in order to purge either the sample compartment or the optical bench or both. The flaps are controlled via the OPUS software. The corresponding buttons are at the Basic page of the Measure- ment dialog window. See the following figure.

Figure 29: Activating the Purge Mode

Purge mode is activated.

Current state of the flaps

Next possible action that can be performed by clicking on this button.

5

Exchanging the Beamsplitter

The flaps can be opened or closed only if the pressure difference between the sample compartment and the optical bench is below the threshold value of 5 hPa.

S p e c i a l C a s e

Besides the normal purge mode in which the optical bench and/or the sample compart- ment are only purged, the following special case is also possible: the vented sample compartment is purged while the optical bench is evacuated. For the realization of this special case, the spectrometer needs to be equipped with windows mounted on either the sample compartment walls or the flaps which are closed in this case. To realize this special case, proceed as follows:

•

Make sure that the purge mode is deactivated in OPUS. (See figure 20.)

•

Evacuate the optical bench and the sample compartment. (See chapter Opera- tion, section Evacuating and Venting the Spectrometer.)

•

Afterwards, vent the sample compartment again. (In this condition, the flaps are closed.)

•

Connect a hose to the purge gas inlet for the sample compartment. (The purge gas inlet is at the spectrometer rear side. See chapter Installation, section Con- necting VERTEX 70v to the Purge Gas Line, figure 7.)

•

Now start the purge gas supply.

Note: The flaps isolate the sample compartment hermetically from the optical bench.

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E X C H A N G I N G T H E B E A M S P L I T T E R

G e n e r a l I n f o r m a t i o n

The standard version and the optional version of VERTEX 70v differ from each other with regard to the interferometer compartment cover design (see fig. 33a and 33b) and the availability of the beamsplitter storage positions (see fig. 31) inside the interferome- ter compartment.

Feature Standard Version Optional Version (S239/V)

Interferometer compartment cover design

A beamsplitter exchange requires the removal of the complete interferometer com- partment cover.

Wing-shaped cover provides for easy access to the beam- splitter.

Availability of the beamsplitter storage positions inside the interferometer compartment

. . . . .

In document EL PRINCIPIO DE CONFIANZA EN DERECHO PENAL (página 179-185)