K-Patents PR-23 Troubleshooting Guide
TROUBLESHOOTING GUIDE
FOR PR-23 ALL MODELS
1 (14)
January 9, 2015
K-PATENTS OY Postal Address: P.O.Box 77, FI-01511 Vantaa, Finland Street Address: Elannontie 5, FI-01510 Vantaa, Finland Tel. int.+358 207 291 570
Fax int.+358 207 291 577 info@kpatents.com www.kpatents.com Vat No. FI03035575 Business ID 0303557-5 Registered in Helsinki
TROUBLESHOOTING GUIDE FOR PR-23 ALL MODELS
Contents
1. Instrument diagnostics ................................................................................................................................ 2
2. Interpreting the Optical Image and Diagnostic Values ............................................................................... 3
3. Prism washing ............................................................................................................................................ 8
4. Typical Faults and Causes ....................................................................................................................... 11
5. Preventive Maintenance Inspection Plan ................................................................................................. 13
TROUBLESHOOTING GUIDE
FOR PR-23 ALL MODELS
2 (14)
January 9, 2015
K-PATENTS OY Postal Address: P.O.Box 77, FI-01511 Vantaa, Finland Street Address: Elannontie 5, FI-01510 Vantaa, Finland Tel. int.+358 207 291 570
Fax int.+358 207 291 577 info@kpatents.com www.kpatents.com Vat No. FI03035575 Business ID 0303557-5 Registered in Helsinki
1. Instrument connectivity for diagnostics
The K-Patents Process Refractometers PR-23 include an Indicating transmitter unit (DTR), which offers the
most convenient channel to diagnose and troubleshoot faulty operation of the refractometer. The same
information can also be obtained through an internal built-in web server using a laptop. Furthermore, FC-11
Field communicator can be connected to the transmitter for data logging and to obtain more detailed
diagnostic information. The FC-11 is specially designed tool for service, troubleshooting and configuration of
the K-Patents instruments.
Figure 1 Instrument diagnostics can be obtained through the transmitter, a laptop or FC-11.
The instrument’s web server can be reached through the instrument’s IP-address. The default IP-address for
the PR-23 series is 192.168.23.254. The FC-11 automatically connects to the instrument if the address has
not been changed. To obtain connection between instrument and laptop, type the IP-address on the
search/address field of the browser. The webpage opens in all common web browsers. Sometimes the IPaddress of the computer needs to be configured prior to establishing the connection, especially if there is no
router between the instrument and the laptop.
1.1 IP configuration for Windows 7
The connection to the instrument is established using a router between the laptop and the instrument. In the
event no router is available or there are other difficulties in connecting to the instrument, follow the
instructions below.
The IP-address of the computer can be configured through Windows control panel by selecting Network and
Sharing Centre, adapter settings and choosing LAN connection properties with a right click of the mouse (1).
Then select the Internet Protocol Version 4 (TCP/IPv6) and click properties (2). This will open a window that
allows configuring the IP-address. The first two sets of numbers in the IP-address should be the same as in
the sensor’s IP-address, however, the IP-addresses should not be totally identical (3). The Subnet mask is
TROUBLESHOOTING GUIDE
FOR PR-23 ALL MODELS
3 (14)
January 9, 2015
K-PATENTS OY Postal Address: P.O.Box 77, FI-01511 Vantaa, Finland Street Address: Elannontie 5, FI-01510 Vantaa, Finland Tel. int.+358 207 291 570
Fax int.+358 207 291 577 info@kpatents.com www.kpatents.com Vat No. FI03035575 Business ID 0303557-5 Registered in Helsinki
given automatically. Make sure that the PC’s wireless function is disabled.
Figure 2 Configuring of instrument’s IP-address when connecting without router
1.2 Web Browser Display
The web browser gives you access to the “remote panel” of the instrument, which mimics the user interface
on the actual transmitter. The simulated panel can be operated by pressing the “soft keys” with your mouse.
You can access all the information through the webpage, but also the printable version of the calibration
verification is available on the webpage.
2. Interpreting the Optical Image and Diagnostic Values
All tools for troubleshooting and performance check of the instrument can be found under “sensor status” in
the transmitter menu (Press MENU 3 SENSOR STATUS). The “sensor status” display shows the optical
image, slope and diagnostical values. You can also activate manual wash from this display to check
functioning and efficiency of the prism washing.
The optical image can be used for inspecting the condition of the optics. The diagnostic values can be used
to evaluate the stability of the measurement and condition of the electronics and optical components of the
TROUBLESHOOTING GUIDE
FOR PR-23 ALL MODELS
4 (14)
January 9, 2015
K-PATENTS OY Postal Address: P.O.Box 77, FI-01511 Vantaa, Finland Street Address: Elannontie 5, FI-01510 Vantaa, Finland Tel. int.+358 207 291 570
Fax int.+358 207 291 577 info@kpatents.com www.kpatents.com Vat No. FI03035575 Business ID 0303557-5 Registered in Helsinki
instrument.
Figure 3 Sensor status page shows the current diagnostic values and optical image
TROUBLESHOOTING GUIDE
FOR PR-23 ALL MODELS
5 (14)
January 9, 2015
K-PATENTS OY Postal Address: P.O.Box 77, FI-01511 Vantaa, Finland Street Address: Elannontie 5, FI-01510 Vantaa, Finland Tel. int.+358 207 291 570
Fax int.+358 207 291 577 info@kpatents.com www.kpatents.com Vat No. FI03035575 Business ID 0303557-5 Registered in Helsinki
2.1 Optical Image and Slope
The optical image can be described as a window to the process medium. However, it also gives information
about the condition of the prism and the optics. Scratches or coating layers on the prism can be identified
from the optical image. Altering shapes are formed with every change in the prism-process interface.
Generally, the instrument has two different optical images, i.e. the raw image and IDS scaled optical image.
The raw image is the real response signal from the fotocells of the CCD-element, which is also unique to
every instrument. Consequently, the IDS image was developed to unify the optical images making the
instrument more user friendly. The IDS image is created by mathematical scaling of the raw image to a
rectangular shape improving the measurement stability on high and low refractive index (RI) ranges.
Figure 4 IDS image on the left and raw image on the right
The detection of the measurement point is based on the steepest slope in the optical image (borderline of
activated vs inactivated light reflection). The slope image gives a derivative graph of the optical image that
can be used to examine the quality of the optical image and stability of the measurement.
Figure 5 Optical image and slope without sample
Without a sample on the prism surface, the IDS scaled optical image should always return to “box” shape.
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