Biral SWS-100-LW: SWS-200-LW, User Manual

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Calibration Procedures Section 5
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Calibration Procedures
5 CALIBRATION PROCEDURES
This section explains how to CHECK the calibration of the sensor and ONLY IF
NECESSARY how to recalibrate it.
ALL THE PROCEDURES IN THIS SECTION REQUIRE
A SWS – LW CALIBRATION KIT
The Meteorological Optical Range (MOR) calibration of the forward scatter
channel and the backscatter channel are checked by the procedure outlined
below.
The Calibration Reference Plaque used for the calibration check has been assigned
a forward scatter value which is a simulation of a MOR expressed in kilometres.
This value is shown on the label on the black plastic connector which attaches the
arm to the calibration screen.
The SWS Lightweight plaque also has a backscatter value which although it also is
expressed in kilometres, is an artificial value assigned only for the purpose of
checking that the sensitivity of the backscatter channel is within its proper limits.
The SWS Lightweight sensor requires a calibration plaque mounting bracket to be
attached to the support pole using the upper sensor U-Bolt mounting. This
bracket is supplied with the calibration kit, but can be supplied separately if more
than one sensor is to be calibrated using a single calibration kit. This bracket is
shown in place in Figure 5-1 Calibration Plaque Mounting Details.
The round calibration screen should first be attached to the calibration arm, and
this assembly should then be attached to the mounting bracket as shown in
Figure 5-1 Calibration Plaque Mounting Details.