Cosa-xentaur Xentaur LPDT Manuel d'utilisateur télécharger pdf (Page 32)

Section 3: Instrument

page 25

diagram of the SetUp State.

The setup state provides nine capabilities, each one con-

trolled from its own mode. Depressing the MODE button

navigates through the modes in the following order:

Se-

lect Alternate Display Units ‹

Select Sensor Type ‹

Set

Measured Attenuation of Sensor at a Low Dewpoint ‹

Set

the Low Dewpoint at which the Attenuation was measured ‹

Set the Calibration Mid-range Adjust ‹

Perform a Test

and Verification of the Analog Output ‹

Set dewpoint cor-

responding to 4mA of Analog Output ‹

Set dewpoint cor-

responding to 20mA of Analog Output ‹

Lock/Unlock the

instrument ‹ (back to)

Select Alternate Display Units.

These nine functions are explained in their respective sec-

tions which follow.

Changes can be made only to an

unlocked instrument

, the changes are stored (when the

MODE button is pressed) and retained even if the unit is

turned off.

Display of alternate units

: In this mode, a second engi-

neering unit can be chosen to be displayed alternating

with the engineering unit selected in the operating state,

for example, a dewpoint can be displayed alternating

with the sample temperature, or dewpoint can be alter-

nately shown in °C and in PPM.

Selecting the sensor type

: In this mode the user can

select the software matching the type of sensor installed

in the instrument;

;7

: XTR-100 (-100°C to +20°C);

;7

: XTR-65 (-65°C to +20°C).

3&4

Adjusting low end sensor attenuation and dewpoint

These modes are used to enter a data pair representing a

low dewpoint and the sensor attenuation measured at

this low dewpoint. (see Sensor Theory of Operation

appendix E). This data pair should not be modified

unless the sensor is replaced. The sensor shipping con-

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Cosa-xentaur Xentaur LPDT Manuel d'utilisateur Page 32

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