1 Introduction
3
The position of the shadow edge is measured digitally using a CCD element (Fig-
ure 1.4) and is converted to a refractive index value n
D
by a processor inside the
sensor. This value is then transmitted together with the process temperature via an
interconnecting cable to the Indicating transmitter for further processing, display and
transmission.
a. Optical image
b. CCD element
c. CCD output
V
Figure 1.4
Optical image detection
1.3 General safety considerations
The process medium may be hot or otherwise hazardous. Use
shields and protective
clothing
adequate for the process medium - do not rely on avoiding contact with the
process medium.
Precautions when removing a standard sensor from the process line
:
•
Check first that the process line is depressurized. Open a vent valve to the atmos-
phere.
•
For a prism wash system, close a hand valve for the wash medium and disable the
wash valve.
•
Loosen the flange or the clamp cautiously, be prepared to tighten again.
•
Ensure you are clear of any possible spillage and you have a clear emergency es-
cape path.
•
After removal of the sensor, it may be necessary to mount a blind cover for security
reasons.
Note:
For the Safe-Drive™ system safety rules, see Section 11.5 and for additional
precautions required by explosive atmosphere, see Section 9.10.2.
Summary of Contents for K-PATENTS PR-23 AX Series
Page 1: ...IM EN PR23 v 2 00 Instruction Manual Vaisala K PATENTS Process Refractometer PR 23...
Page 2: ......
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Page 17: ...2 Inline refractometer sensor 7 2 2 2 PR 23 mounting guide...
Page 26: ...16 PR 23 instruction manual...
Page 29: ...4 Prism wash systems 19 Figure 4 1 A prism wash system for steam non sanitary...
Page 30: ...20 PR 23 instruction manual Figure 4 2 A sanitary prism wash system for steam...
Page 32: ...22 PR 23 instruction manual Figure 4 5 Wiring for a prism wash system for steam...
Page 33: ...4 Prism wash systems 23 Figure 4 6 A prism wash system for high pressure water non sanitary...
Page 34: ...24 PR 23 instruction manual Figure 4 7 A sanitary prism wash system for high pressure water...
Page 35: ...4 Prism wash systems 25 Figure 4 8 Wiring for a prism wash system for high pressure water...
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Page 179: ...11 Safe Drive 169 11 3 3 Safe Drive steam wash system parts...
Page 186: ...176 PR 23 instruction manual 11 4 2 Wiring Figure 11 9 PR 23 SD system wiring...
Page 204: ...194 PR 23 instruction manual Figure 11 19 Markings on the retractor handle...
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