K-Patents PR-21-S - Manual (Page 125)

12 Sensor verification 119
Important: When you have performed a verification on a sensor, reload/refresh
the verification page to view the newest results. The date given on the verifica-
tion page is the page load date, not necessarily the verification date.
PROCESS REFRACTOMETER PR-23
Sensor verification
Page loaded on February 2, 2009 at 03:19:28 PM
Sensor information
Serial number: R05676
Test results
Nominal nD Measurement Sensor
at 25°C at
actual
temp.
Measured
nD
Accuracy Result Head
temp.
°C
Head
hum.
%
Supply
current
mA
1 1.3300 1.3297 1.3296 0.0001 pass 30 3 39
2 1.3700 1.3697 1.3696 0.0001 pass 30 3 39
3 1.4200 1.4196 1.4197 0.0000 pass 30 3 39
4 1.4700 1.4697 1.4697 0.0000 pass 30 3 39
5 1.5200 1.5196 1.5196 0.0000 pass 30 3 39
Verification result: pass
Traceability and conformance
Measurements should be done by using Cargille Refractive Index Liquids with
stated in accuracy of ±0.0002 R.I.
Cargille Index of Refraction Liquids are manufactured and calibrated using
instruments whose accuracy is verified by daily comparision to N.I.S.T. (N.B.S.)
traceable standards. N.I.S.T. standards are based on angle measurements using
a Wild divided circle spectrometers.
K-Patents PR-23 Refractometer System: Sensor verification http://192.168.23.250/verif.shtml
1 of 1 2.2.2009 15:21
Figure 12.8 Instrument
verification certificate (example)
The date and time settings are taken from the browser, i.e. the computer used to
view the verification certificate. The DTR doesn’t have timekeeping functionality.
To print the verification certificate, simply use your browser’s print function. The
page is designed so that with browser default settings it normally fits onto a single
sheet of A4 or letter sized paper; the navigation bar is omitted for cleaner printout
(Figure 12.8).
Note: If you need to verify two sensors connected to one DTR, you need to verify
one and then to save or print the certificate, as the results from the verification of
the second sensor will overwrite the results of the first sensor. Check the sensor
serial number on the certificate to see that you have correct results on screen and
reload/refresh if needed.
12.4 Corrective action
If you get the message VERIFICATION FAILED (Figure 12.9), first check that the prism and
the sample holder are absolutely clean and the sample holder sits tightly on the
sensor tip before a standard liquid is applied. Make sure the standard liquids are in
good condition and not past their expiration date. Also, inspect the prism surface,