K-Patents PR-33-AC - Manual (Page 19)

4 Startup and use 13
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4 Startup and use
4.1 Startup
4.1.1 Initial check
Connect the Sanitary OEM Refractometer to a 24 V dc supply (see section 2.1 and sec-
tion 3.3), and check that the instrument powers up properly. This is easiest to check
by measuring the milliamp output, which should be at 4 mA after the first start-up. It
is also possible to see a faint blinking amber light when the prism is looked at at an
oblique angle.
Connect the instrument to a computer with an Ethernet cable (RJ-45 to M12 type).
After the instrument has powered up, use a web browser to open the instrument home-
page (see section 2.3) and check that the serial number of the page corresponds to that
on the instrument nameplate. In case you have difficulties connecting to the instru-
ment, please see section 2.3.6.
4.1.2 Calibration check
Wait until normal process conditions occur. The concentration reading is precalibrated
at delivery and a copy of the Calibration certificate is shipped with the refractometer.
If the diagnostic message is
NORMAL OPERATION
but the concentration reading does
not agree with the laboratory results, consult Section 6.2, “Calibrating the concentra-
tion measurement”.
4.2 Viewing refractometer status
The basic information on the measurements is shown on the main page of the instru-
ment (section 5.1). More information is shown on the Diagnostics page (section 5.3).
The measurement result is calculated from the refractive index (n
D
) and process tem-
perature (T) values. Both of these values are available on the main page.
In addition to these measurements, the refractometer monitors its internal temper-
ature and humidity, which both are available on the Diagnostics page. The internal