Vaisala K-PATENTS PR-23 Series User manual

IM-EN-PR23-E
User Guide
Process Refractometer
PR-23 Series

PUBLISHED BY
Vaisala Oyj
Vanha Nurmijärventie 21, FI-01670 Vantaa, Finland
P.O. Box 26, FI-00421 Helsinki, Finland
[phone]
Visit our Internet pages at www.vaisala.com.
© Vaisala 2021
No part of this document may be reproduced,
published or publicly displayed in any form or by
any means, electronic or mechanical (including
photocopying), nor may its contents be modified,
translated, adapted, sold or disclosed to a third
party without prior written permission of the
copyright holder. Translated documents and
translated portions of multilingual documents are
based on the original English versions. In
ambiguous cases, the English versions are
applicable, not the translations.
The contents of this document are subject to
change without prior notice.
Local rules and regulations may vary and they
shall take precedence over the information
contained in this document. Vaisala makes no
representations on this document’s compliance
with the local rules and regulations applicable at
any given time, and hereby disclaims any and all
responsibilities related thereto.
This document does not create any legally
binding obligations for Vaisala towards customers
or end users. All legally binding obligations and
agreements are included exclusively in the
applicable supply contract or the General
Conditions of Sale and General Conditions of
Service of Vaisala.
This product contains software developed by
Vaisala or third parties. Use of the software is
governed by license terms and conditions
included in the applicable supply contract or, in
the absence of separate license terms and
conditions, by the General License Conditions of
Vaisala Group.
This product may contain open source software
(OSS) components. In the event this product
contains OSS components, then such OSS is
governed by the terms and conditions of the
applicable OSS licenses, and you are bound by the
terms and conditions of such licenses in
connection with your use and distribution of the
OSS in this product. Applicable OSS licenses are
included in the product itself or provided to you
on any other applicable media, depending on
each individual product and the product items
delivered to you.

Table of contents
1. About this document...................................................................................... 11
1.1 Version information............................................................................................ 11
1.2 Documentation conventions..............................................................................11
1.3 Trademarks..........................................................................................................12
1.4 Patent notice.......................................................................................................12
2. Product overview.............................................................................................13
2.1 Safety...................................................................................................................13
2.2 Storage conditions, packaging and transportation....................................... 15
2.3 PR-23 refractometer models............................................................................ 15
2.4 Refractometer sensor........................................................................................ 15
3. Mounting sensor...............................................................................................17
3.1 Choosing sensor mounting location................................................................17
3.2 PR-23 mounting guide...................................................................................... 19
3.3 Pipe mounting checklist...................................................................................20
3.4 Checklist for mounting in tank, vessel or large pipe.................................... 20
4. Indicating transmitter DTR...........................................................................21
4.1 Mounting indicating transmitter..................................................................... 23
4.2 Electrical connections...................................................................................... 24
4.2.1 Interconnecting cable................................................................................ 24
4.2.2 Connecting sensor......................................................................................25
4.2.3 Connecting indicating transmitter............................................................27
4.2.4 Power terminals for AC power.................................................................. 33
4.2.5 Power terminals for 24 VDC power..........................................................33
4.2.6 Relay connections...................................................................................... 34
4.2.7 Reset button................................................................................................36
5. Prism wash systems....................................................................................... 37
5.1 Prism coating..................................................................................................... 37
5.2 Prism wash......................................................................................................... 37
5.2.1 Recommended wash pressures and times.............................................. 37
5.2.2 Prism wash systems................................................................................... 39
5.2.3 Prism wash nozzles.................................................................................... 46
6. Startup and use............................................................................................... 50
6.1 Startup............................................................................................................... 50
6.1.1 Initial check................................................................................................. 50
6.1.2 Calibration check......................................................................................... 51
6.1.3 Testing prism wash...................................................................................... 51
6.2 Using indicating transmitter............................................................................. 51
6.2.1 Keyboard functions.................................................................................... 52
6.2.2 Display setup...............................................................................................53
6.3 Viewing system information............................................................................ 55
6.4 Viewing sensor status.......................................................................................55
6.4.1 Optical image with IDS.............................................................................. 55
6.4.2 Optical image with VD............................................................................... 57
6.4.3 Diagnostic values........................................................................................ 57
6.4.4 Temperature measurement....................................................................... 58
6.4.5 Sensor head humidity................................................................................ 58
6.5 Sensor verification............................................................................................ 58
Table of contents
1

7. Configuration and calibration....................................................................59
7.1 Configuring output signal damping............................................................... 59
7.1.1 Exponential damping.................................................................................59
7.1.2 Linear damping.......................................................................................... 60
7.1.3 Slew rate limit...............................................................................................61
7.2 Configuring output signal hold functionality................................................ 62
7.2.1 External hold............................................................................................... 63
7.2.2 Hold during wash........................................................................................63
7.2.3 Tolerance time.............................................................................................63
7.2.4 QF threshold............................................................................................... 64
7.2.5 Hold source interactions............................................................................64
7.2.6 Hold and signal damping...........................................................................65
7.2.7 Hold functions with DD‑23........................................................................ 65
7.3 Configuring refractometer system................................................................. 66
7.3.1 Configuring relays...................................................................................... 66
7.3.2 Configuring input switches....................................................................... 68
7.3.3 Configuring mA outputs............................................................................70
7.4 Calibrating concentration measurement........................................................72
7.4.1 Chemical curve............................................................................................74
7.4.2 Selecting display units and display decimals.......................................... 74
7.4.3 Field calibration...........................................................................................75
7.4.4 Entering field calibration parameters...................................................... 76
7.4.5 Direct BIAS adjustment..............................................................................76
7.5 Configuring prism wash................................................................................... 77
7.5.1 Wash cycle...................................................................................................77
7.5.2 Setting prism wash parameters................................................................82
8. Regular maintenance.................................................................................... 84
8.1 Checking sensor humidity level...................................................................... 84
8.2 Checking prism and prism gaskets.................................................................84
9. Troubleshooting.............................................................................................. 85
9.1 Hardware............................................................................................................85
9.1.1 Blank display............................................................................................... 88
9.1.2 Diagnostic LEDs..........................................................................................89
9.1.3 Display unreadable......................................................................................91
9.1.4 Troubleshooting messages........................................................................92
9.1.5 Diagnostic message priorities...................................................................97
10. Sensor specifications.................................................................................... 99
10.1 Sensor compatibility.........................................................................................99
10.2 Sensor rangeability...........................................................................................99
10.3 Sanitary process refractometer PR‑23‑AC...................................................100
10.3.1 PR‑23‑AC sensor model code.................................................................100
10.3.2 PR‑23‑AC mounting hardware model code...........................................102
10.3.3 PR‑23‑AC specifications.......................................................................... 106
10.3.4 PR‑23‑AC parts list....................................................................................107
10.3.5 PR‑23‑AC mounting specifics..................................................................107
10.3.6 Mounting specifics for EHEDG‑certified PR‑23‑AC configuration....... 112
10.3.7 3‑A Sanitary Standard compliance.......................................................... 112
10.4 Sanitary probe refractometer PR‑23‑AP....................................................... 113
10.4.1 PR‑23‑AP model code............................................................................... 113
10.4.2 PR‑23‑AP mounting hardware model code............................................116
10.4.3 PR‑23‑AP specifications............................................................................118
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10.4.4 PR‑23‑AP parts list.....................................................................................119
10.4.5 PR‑23‑AP mounting specifics...................................................................119
10.4.6 Mounting specifics for EHEDG‑certified PR‑23‑AP configuration....... 121
10.4.7 3‑A Sanitary Standard compliance.......................................................... 121
10.5 Compact process refractometer PR‑23‑GC..................................................122
10.5.1 PR‑23‑GC sensor model code..................................................................122
10.5.2 PR‑23‑GC specifications...........................................................................124
10.5.3 PR‑23‑GC parts list....................................................................................126
10.5.4 PR‑23‑GC mounting specifications.........................................................126
10.6 Probe process refractometer PR‑23‑GP........................................................ 131
10.6.1 PR‑23‑GP sensor model code..................................................................132
10.6.2 PR‑23‑GP specifications...........................................................................133
10.6.3 PR‑23‑GP thermal cover PR‑7062.......................................................... 134
10.6.4 PR‑23‑GP parts list....................................................................................136
10.6.5 PR‑23‑GP mounting specifications......................................................... 137
10.7 Process refractometer PR‑23‑RP...................................................................138
10.7.1 PR‑23‑RP sensor model code..................................................................139
10.7.2 PR‑23‑RP specifications...........................................................................140
10.7.3 PR‑23‑RP parts list..................................................................................... 141
10.7.4 PR‑23‑RP head parts list.......................................................................... 142
10.7.5 PR‑23‑RP dimensions...............................................................................143
10.7.6 PR‑23‑RP mounting specifications.........................................................144
10.7.7 PR‑23‑RP prism wash system..................................................................145
10.8 Teflon body refractometer PR‑23‑M/MS...................................................... 146
10.8.1 PR‑23‑M sensor model code....................................................................147
10.8.2 PR‑23‑M specifications.............................................................................149
10.8.3 PR‑23‑M parts list......................................................................................150
10.8.4 PR‑23‑MS sensor model code................................................................. 150
10.8.5 PR‑23‑MS specifications...........................................................................152
10.8.6 PR‑23‑MS parts list....................................................................................153
10.8.7 PR‑23‑M/MS mounting specifications....................................................154
10.9 Saundersâbody refractometer PR‑23‑W....................................................154
10.9.1 PR‑23‑W sensor model code................................................................... 155
10.9.2 PR‑23‑W specifications............................................................................ 157
10.9.3 PR‑23‑W parts list..................................................................................... 159
10.9.4 PR‑23‑W mounting specifications.......................................................... 159
10.10 Intrinsically safe refractometers PR‑23‑…‑IA, PR‑23‑…‑IF and
PR‑23‑…‑CI.........................................................................................................161
10.10.1 Intrinsically safe refractometer equipment.............................................161
10.10.2 Intrinsically safe mounting.......................................................................165
10.10.3 Isolator/barriers........................................................................................ 168
11. Safe-Drive.........................................................................................................170
11.1 Safe‑Drive system description.......................................................................170
11.2 PR‑23‑SD specifications................................................................................. 170
11.3 Safe‑Drive component parts lists...................................................................172
11.3.1 PR-23-SD sensor....................................................................................... 172
11.3.2 Safe‑Drive isolation valve SDI2‑23.......................................................... 173
11.3.3 Safe‑Drive steam wash system parts......................................................174
11.3.4 Safe‑Drive retractor SDR2‑23.................................................................. 175
Table of contents
3

11.4 Safe‑Drive mounting....................................................................................... 175
11.4.1 Welding isolation valve to pipe............................................................... 178
11.4.2 PR-23-SD system wiring...........................................................................182
11.4.3 Steam piping for SDI2...............................................................................182
11.4.4 High pressure water piping for SDI2.......................................................185
11.4.5 Water consumption of high pressure wash system..............................186
11.4.6 Non-retractable wash nozzle SDI2‑23‑WPR/WPN‑XS......................... 187
11.5 Safe sensor insertion and removal for Safe‑Drive generation 2.1.............. 189
11.5.1 Inserting Safe‑Drive sensor..................................................................... 190
11.5.2 Removing Safe‑Drive sensor................................................................... 198
11.6 Wash nozzle insertion and removal............................................................. 206
11.6.1 Inserting wash nozzle..............................................................................206
11.6.2 Removing wash nozzle........................................................................... 208
11.7 Thermal cover for SDI2‑23...............................................................................211
11.8 Blinding Safe‑Drive system............................................................................ 213
11.9 Identifying your refractometer generation.................................................. 214
12. PR‑23 process refractometers in potentially explosive
atmosphere......................................................................................................216
12.1 Equipment........................................................................................................ 216
12.2 Installation........................................................................................................ 219
13. Indicating transmitter DTR and STR specifications....................... 222
13.1 Compatibility...................................................................................................222
13.2 Indicating transmitter model codes............................................................. 223
13.3 Specifications..................................................................................................223
13.3.1 Indicating transmitter specifications..................................................... 223
13.4 Transmitter parts list...................................................................................... 225
14. Interconnecting cable.................................................................................226
14.1 Interconnecting cable model code...............................................................226
14.2 Interconnecting cable specifications........................................................... 226
15. Ethernet connection specification........................................................ 227
15.1 Cable requirements and connection............................................................ 227
15.1.1 Ethernet cable specification................................................................... 227
15.1.2 Connecting Ethernet cable..................................................................... 229
15.2 Connection settings....................................................................................... 230
15.2.1 IP settings for DTR...................................................................................230
15.2.2 IP settings for stand-alone computer.....................................................231
15.3 Testing Ethernet connection......................................................................... 232
15.3.1 Troubleshooting connection...................................................................233
15.4 Instrument homepage................................................................................... 234
15.4.1 Remote panel............................................................................................235
15.4.2 Sensor verification certificate.................................................................236
15.5 Collecting data using Ethernet..................................................................... 236
15.5.1 Communication protocol........................................................................ 236
15.5.2 Request-response pair specification..................................................... 238
15.5.3 Error message specification...................................................................240
16. Sensor verification....................................................................................... 242
16.1 Refractive index nDverification.................................................................... 242
16.1.1 Handling R.I. liquids................................................................................. 243
16.2 Verification procedure................................................................................... 243
16.3 Sensor verification certificate....................................................................... 246
16.4 Corrective action............................................................................................ 249
PR-23 Series User Guide IM-EN-PR23-E
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17. Regulatory compliance and certifications.......................................... 251
17.1 Declaration of conformity for PR-23 series refractometers....................... 251
17.2 Declaration of conformity for PR-23-...-AX models (ATEX)......................253
17.3 Declaration of conformity for PR-23-...-IA models (ATEX)....................... 255
Appendix A: Glossary and abbreviations................................................ 257
Appendix B: Principle of measurement...................................................258
Appendix C: PR-23 sensor verification form..........................................260
Appendix D: Field calibration form........................................................... 261
Appendix E: DTR command selection tree.............................................262
Appendix F: STR/Divert mode command selection tree.................... 263
Index................................................................................................................. 265
Warranty.......................................................................................................... 267
Technical support...........................................................................................267
Recycling..........................................................................................................267
Table of contents
5

List of figures
Figure 1 Refractometer equipment.............................................................................13
Figure 2 Sensor structure...............................................................................................16
Figure 3 Indicating transmitter enclosure..................................................................21
Figure 4 Linearized curve.............................................................................................. 22
Figure 5 Indicating transmitter dimensions and mounting feet measures..... 24
Figure 6 Sensor electrical connections......................................................................26
Figure 7 Opening indicating transmitter front panel.............................................29
Figure 8 External power switch...................................................................................30
Figure 9 Motherboard (AC power).............................................................................. 31
Figure 10 Motherboard (24 VDC)..................................................................................32
Figure 11 Location of reset button............................................................................... 36
Figure 12 Prism wash system for steam (non-sanitary)......................................... 39
Figure 13 Sanitary prism wash system for steam.....................................................40
Figure 14 Pressure reducing valve PR‑3341‑J............................................................. 41
Figure 15 Install strainer horizontally...........................................................................42
Figure 16 Wiring for a prism wash system for steam.............................................. 43
Figure 17 Prism wash system for high pressure water............................................44
Figure 18 Wiring for prism wash system for high pressure water....................... 45
Figure 19 Wash nozzles for flow cell AFC‑HSS‑XXX‑XX‑NC................................. 46
Figure 20 Process connection of wash nozzle in flow cell......................................47
Figure 21 Mounting of wash nozzle for sanitary probe
refractometer PR‑23‑AP............................................................................... 48
Figure 22 Mounting of wash nozzle for process refractometer PR‑23‑GP........ 49
Figure 23 Main display alternatives.............................................................................. 50
Figure 24 DTR keyboard and Main menu for sensor B............................................ 52
Figure 25 Display setup menu........................................................................................53
Figure 26 Main display format selection..................................................................... 54
Figure 27 System description.........................................................................................55
Figure 28 Optical images with IDS................................................................................56
Figure 29 Slope graph with IDS..................................................................................... 56
Figure 30 Optical images with VD.................................................................................57
Figure 31 Exponential damping.................................................................................... 60
Figure 32 Linear damping................................................................................................ 61
Figure 33 Slew rate damping..........................................................................................62
Figure 34 Eect of tolerance time on output............................................................ 64
Figure 35 Damping stops during hold......................................................................... 65
Figure 36 Relay menu for relay 1....................................................................................66
Figure 37 Output menu for mA Output 1......................................................................71
Figure 38 Default mA output values.............................................................................72
Figure 39 Concentration calibration layers................................................................. 73
Figure 40 Using FIELD SAMPLE soft key.....................................................................76
Figure 41 Automatic prism wash cycle........................................................................ 77
Figure 42 Wash logic.........................................................................................................79
Figure 43 Wash cycle......................................................................................................... 81
Figure 44 Transmitter card positions............................................................................86
Figure 45 Motherboard PR‑10600 and H1 interface card PR‑10701..................... 87
Figure 46 Troubleshooting blank display....................................................................88
Figure 47 Checking power supply.................................................................................89
Figure 48 Diagnostic LED functions.............................................................................. 91
Figure 49 Sensor nameplates.........................................................................................99
Figure 50 PR‑23 rangeability........................................................................................ 100
PR-23 Series User Guide IM-EN-PR23-E
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Figure 51 PR‑23‑M/MS/W rangeability with a sapphire prism (74)
and with a standard prism (73).................................................................100
Figure 52 PR‑23‑AC parts list........................................................................................107
Figure 53 Mounting with sanitary ferrule pipe diameter 3 in
(80 mm) or more...........................................................................................108
Figure 54 Flow cell AFC‑HSS‑H10 for pipe diameter 1 in (25 mm)
and H15 for pipe diameter 1.5 in (40 mm)..............................................109
Figure 55 Flow cell AFC‑HSS‑with wash nozzle connection (‑NC)
H10 for pipe diameter 1 in (25 mm) and H15 for pipe
diameter 1.5 in (40 mm)...............................................................................110
Figure 56 Flow cell AFC‑HSS‑H20 for pipe diameter 2 in (50 mm)
and H25 for pipe diameter 2.5 in (65 mm)...............................................111
Figure 57 Flow cell AFC‑HSS‑with wash nozzle connection (‑NC)
H20 for pipe diameter 2 in (50 mm) and H25 for pipe
diameter 2.5 in (65 mm)...............................................................................112
Figure 58 PR‑23‑AP parts list.........................................................................................119
Figure 59 Insertion of probe refractometer PR‑23‑AP‑XX‑TSS...........................120
Figure 60 Flush mounting probe refractometer PR‑23‑AP‑XX‑PSS....................121
Figure 61 PR‑23‑GC parts list........................................................................................126
Figure 62 Mounting sensor in pipe 2.5 in or larger..................................................127
Figure 63 Mounting sensor in 2 in pipe...................................................................... 128
Figure 64 Mounting sensor with PFC flow cell......................................................... 129
Figure 65 Mounting sensor with WFC flow cell....................................................... 129
Figure 66 Mounting wafer flow cell and sensor in vertical pipe..........................130
Figure 67 Mounting wafer flow cell and sensor in horizontal pipe......................131
Figure 68 Mounting thermal cover on PR‑23‑GP.....................................................135
Figure 69 PR‑23‑GP parts list........................................................................................136
Figure 70 PR‑23‑GP‑A/D/JSS flow cell....................................................................... 137
Figure 71 PR‑23‑GP‑LSS flow cell................................................................................ 138
Figure 72 PR‑23‑RP parts list......................................................................................... 141
Figure 73 PR‑23‑RP head parts list..............................................................................142
Figure 74 PR‑23‑RP‑73‑M20..........................................................................................143
Figure 75 CFC‑RP‑M20‑SS/HC/HA‑M10‑NC‑PG/SN/WP flow cell ....................144
Figure 76 CFC‑RP‑M20‑SS/HC/HA‑M20‑NC‑PG/SN/WP flow cell.................... 145
Figure 77 Prism wash system for PR‑23‑RP..............................................................146
Figure 78 PR‑23‑M/MS sensor...................................................................................... 147
Figure 79 PR‑23‑M parts list..........................................................................................150
Figure 80 PR‑23‑MS parts list........................................................................................153
Figure 81 PR‑23‑M with ½ in G/NPT process connection..................................... 154
Figure 82 PR‑23‑W Saundersâbody sensor............................................................155
Figure 83 PR‑23‑W parts................................................................................................159
Figure 84 PR‑23‑W mounting.......................................................................................160
Figure 85 Refractometer system PR‑23‑…‑IA/‑IF/‑CI with STR...........................162
Figure 86 Intrinsically safe sensor nameplates........................................................ 163
Figure 87 Intrinsically safe parts.................................................................................. 164
Figure 88 Warning sticker..............................................................................................164
Figure 89 Intrinsically safe wiring, PR‑23‑…‑IA/‑CI according to WRG‑362.... 166
Figure 90 Intrinsically safe wiring, PR‑23‑…‑IF with STR according
to WRG‑478.................................................................................................... 167
Figure 91 Isolator unit wiring........................................................................................169
Figure 92 Safe‑Drive system: isolation valve, PR‑23‑SD sensor, retractor........170
Figure 93 PR-23-SD sensor parts.................................................................................172
Figure 94 Safe‑Drive isolation valve parts................................................................. 173
Figure 95 Safe‑Drive steam wash system parts....................................................... 174
Figure 96 Safe‑Drive retractor.......................................................................................175
List of figures
7

Figure 97 Selecting mounting location...................................................................... 176
Figure 98 Mounting Safe‑Drive on vertical pipe.......................................................177
Figure 99 Mounting Safe‑Drive on horizontal pipe................................................. 178
Figure 100 Safe-Drive isolation valve installation guide sticker............................ 179
Figure 101 Welding Safe-Drive isolation valve to horizontal pipe....................... 180
Figure 102 Welding Safe-Drive isolation valve to vertical pipe.............................. 181
Figure 103 PR-23-SD system wiring..............................................................................182
Figure 104 Mounting steam wash to isolation valve.................................................183
Figure 105 Pressure-reducing valve PR‑3341‑J..........................................................184
Figure 106 Install strainer horizontally..........................................................................185
Figure 107 Mounting high pressure water wash to isolation valve.......................186
Figure 108 Installing non-retractable wash nozzle................................................... 188
Figure 109 Recommended work zone by side of SD............................................... 190
Figure 110 Mounting thermal cover...............................................................................212
Figure 111 Removing thermal cover............................................................................. 213
Figure 112 SDI mounting flange plug system.............................................................214
Figure 113 Identifying dierent Safe‑Drive generations......................................... 215
Figure 114 Refractometer system PR‑23‑…‑AX/FM/CS/CX....................................217
Figure 115 PR‑23‑…‑AX/FM/CS/CX sensor nameplates..........................................218
Figure 116 Safe sensor wiring........................................................................................220
Figure 117 Indicating transmitter DTR serial number label................................... 222
Figure 118 Indicating transmitter STR serial number label....................................222
Figure 119 Indicating transmitter DTR and STR parts (STR-specific
parts in italics)............................................................................................... 225
Figure 120 Connecting DTR to computer....................................................................227
Figure 121 Connecting DTR to LAN..............................................................................228
Figure 122 Connecting DTR to hub or switch............................................................ 228
Figure 123 Connecting DTR to WLAN......................................................................... 228
Figure 124 Using fiber optics Ethernet........................................................................229
Figure 125 Ethernet connector on underside of front panel.................................230
Figure 126 Typical IP configuration for stand-alone laptop when
connected to DTR; laptop wireless (WLAN) turned o......................231
Figure 127 Ping OK............................................................................................................233
Figure 128 Ping error message...................................................................................... 233
Figure 129 Instrument homepage open in browser.................................................235
Figure 130 DTR remote panel.........................................................................................236
Figure 131 Universal sample holder PR‑1012..............................................................242
Figure 132 Verification, pre-verificaton checks.........................................................243
Figure 133 Verification display...................................................................................... 244
Figure 134 Typical optical images.................................................................................244
Figure 135 Verification in progress............................................................................... 245
Figure 136 Verification completed successfully (here only with one
RI liquid)..........................................................................................................245
Figure 137 Instrument verification page open in browser.....................................246
Figure 138 Instrument verification certificate........................................................... 248
Figure 139 Verification failed..........................................................................................249
Figure 140 Finding verification information for sensor verification form..........250
Figure 141 Refractometer principle..............................................................................258
Figure 142 Optical images...............................................................................................259
Figure 143 Optical image detection.............................................................................259
PR-23 Series User Guide IM-EN-PR23-E
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List of tables
Table 1 Document versions (English)............................................................................11
Table 2 PR-23 patents....................................................................................................... 12
Table 3 Wash medium parameters for integral wash nozzles in
PR‑23‑AP/GP........................................................................................................38
Table 4 Wash medium parameters for flow cell wash nozzle AFC...................... 38
Table 5 Wash medium parameters for Safe‑Drive isolation valve
nozzle SDI............................................................................................................. 38
Table 6 Prism wash nozzle selection............................................................................47
Table 7 Chemical curve parameters............................................................................. 74
Table 8 Diagnostic LEDs..................................................................................................90
Table 9 Hardware troubleshooting...............................................................................92
Table 10 Measurement troubleshooting....................................................................... 94
Table 11 Wash troubleshooting.......................................................................................96
Table 12 Sanitary compact refractometer for pipelines......................................... 100
Table 13 Elbow flow cells for PR‑23‑AC‑xx‑HSS sensor..........................................102
Table 14 EHEDG certified elbow flow cells, connection sanitary clamp 2.5 in..103
Table 15 Elbow flow cells with prism wash nozzle for PR‑23‑AC‑xx‑HSS..........103
Table 16 Mounting hardware for PR-23-AC-xx-HSS sensor...................................104
Table 17 Mounting hardware for PR‑23‑AC‑xx‑ESS sensor................................... 104
Table 18 Side flow cells, connection sanitary clamp 2.5 in.....................................105
Table 19 General specifications..................................................................................... 106
Table 20 Sensor PR-23-AC specifications................................................................... 106
Table 21 Sanitary probe refractometer for large pipelines and vessels...............113
Table 22 Sanitary probe refractometer PR‑23‑AP with prism wash
for large pipelines and vessels....................................................................... 114
Table 23 Mounting hardware for PR‑23‑AP sensor....................................................116
Table 24 Side flow cells, connection sanitary clamp 2.5 in...................................... 117
Table 25 Aseptic steam valve for PR‑23‑AP‑ISS.........................................................117
Table 26 General specifications.......................................................................................118
Table 27 Sensor PR‑23‑AP specifications.....................................................................118
Table 28 PR‑23‑GC sensor model code........................................................................122
Table 29 Wafer flow cell model code............................................................................123
Table 30 Pipe flow cell model code...............................................................................124
Table 31 General specifications......................................................................................124
Table 32 Sensor PR‑23‑GC specifications....................................................................125
Table 33 PR‑23‑GP sensor model code........................................................................132
Table 34 General specifications......................................................................................133
Table 35 Sensor PR‑23‑GP specifications....................................................................134
Table 36 PR‑23‑RP sensor model code........................................................................139
Table 37 General specifications..................................................................................... 140
Table 38 Sensor PR‑23‑RP specifications................................................................... 140
Table 39 PR‑23‑M sensor model code.......................................................................... 147
Table 40 Flow cell for sensor PR‑23‑M......................................................................... 148
Table 41 General specifications......................................................................................149
Table 42 Sensor PR‑23‑M specifications......................................................................149
Table 43 Flow cell for PR‑23‑M specifications............................................................149
Table 44 PR‑23‑MS sensor model code....................................................................... 150
Table 45 Flow cell for sensor PR‑23‑MS........................................................................151
Table 46 General specifications......................................................................................152
Table 47 Sensor PR-23-MS specifications................................................................... 152
Table 48 Flow cell for PR‑23‑MS specifications..........................................................153
Table 49 PR‑23‑W sensor model code......................................................................... 155
List of tables
9

Table 50 Saundersâvalve body flow cell for sensor PR‑23‑W............................. 156
Table 51 General specifications...................................................................................... 157
Table 52 Sensor PR‑23‑W specifications..................................................................... 157
Table 53 Saundersâvalve body specifications......................................................... 158
Table 54 PR‑23‑SD specifications..................................................................................170
Table 55 PR-23-SD and isolation valve SDI-23 specifications................................ 171
Table 56 Safe‑Drive retractor SDR-23 specifications................................................ 171
Table 57 Nozzle flow at various pressures with 2 mm (0.080 in)
nozzle orifice diameter....................................................................................186
Table 58 Indicating transmitter DTR and STR model codes..................................223
Table 59 Indicating transmitter specifications.......................................................... 223
Table 60 Interconnecting cable model code..............................................................226
Table 61 Interconnecting cable specifications.......................................................... 226
Table 62 Request-response pair specification.......................................................... 238
Table 63 Verification results display............................................................................ 260
PR-23 Series User Guide IM-EN-PR23-E
10

1. About this document
1.1 Version information
This document provides instructions for installing, using and maintaining Vaisala K-
PATENTSâProcess Refractometer PR-23.
Table 1 Document versions (English)
Document code Date Description
IM-EN-PR23, E February 2021 Structure and style updates, updates to sensor specifications.
IM-EN-PR23, D January 2021 Minor updates.
IM-EN-PR23, C November 2019 New AX certificate
1.2 Documentation conventions
Warning alerts you to a serious hazard. If you do not read and follow
instructions carefully at this point, there is a risk of injury or even death.
WARNING!
Caution warns you of a potential hazard. If you do not read and follow
instructions carefully at this point, the product could be damaged or important data
could be lost.
CAUTION!
Note highlights important information on using the product.
Tip gives information for using the product more eciently.
Lists tools needed to perform the task.
Chapter 1 – About this document
11

Indicates that you need to take some notes during the task.
1.3 Trademarks
Vaisalaâand K-PATENTS® are registered trademarks of Vaisala Oyj.
Linuxâis a registered trademark of Linus Torvalds.
Windowsâis either a registered trademark or trademark of Microsoft Corporation in the
United States and other countries.
All other product or company names that may be mentioned in this publication are trade
names, trademarks, or registered trademarks of their respective owners.
1.4 Patent notice
This product is protected by the following patents and patent applications and their
corresponding national rights:
Table 2 PR-23 patents
Product Applicable patent
Process Refractometer PR-03/23/33 US 9063020 23.2.2032
Process Refractometer PR-03M/23M/MS/W US 6760098 1.8.2021
US 9028140 19.1.2032
SAFE-DRIVE™ Refractometer PR-23-SD FI 118442 17.6.2026
US 7631569 9.12.2027
Process Refractometer PR-23/33 also has the following additional patent applications
pending:
• FI 20106065
• DE 102011084387.6
• US 13/273,907
• FI 20106066
• DE 102011094386.8
• US 13/274,000
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2. Product overview
The PR‑23 in‑line refractometer is an instrument for measuring liquid concentration in the
process line. The measurement is based on the refraction of light in the process medium, an
accurate and safe way of measuring liquid concentration.
PROCESSINSTRUMENTS
PO W E R
1 2 3
Figure 1 Refractometer equipment
1Sensors
2Interconnecting cables
3Indicating transmitter
The in‑line refractometer sensor (1) measures the refractive index nDand the temperature of
the process medium. This information is sent through the interconnecting cable (2) to the
indicating transmitter (3). The indicating transmitter DTR calculates the concentration of the
process liquid based on the refractive index and temperature, taking predefined process
conditions into account. The output of the DTR is a 4 to 20 mA DC output signal
proportional to process solution concentration. Process data can also be downloaded to a
computer through an Ethernet cable.
The password for PR‑23 is:
7 8 4 5 1 2
2.1 Safety
This product has been tested for safety. Note the following precautions:
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Only licensed experts may install electrical components. They must
adhere to local and state legislation and regulations.
WARNING!
Precautions when removing the sensor from the process line:
•Make positively sure that the process line is not under pressure. Open a vent valve to
the atmosphere.
• For a prism wash system, close a hand valve for the wash medium and disable the wash
valve.
• Loosen the flange or clamp cautiously, be prepared to tighten again.
• Be out of the way of any possible splash and ensure the possibility of escape.
• Use shields and protective clothing adequate for the process medium, do not rely on
avoidance of contact with the process medium.
• After removal of the sensor, it may be necessary to mount a blind cover for security
reasons.
For the Safe-Drive system safety rules, see Safe sensor insertion and removal for
Safe‑Drive generation 2.1 (page 189) and for additional precautions required by explosive
atmosphere, see PR‑23 process refractometers in potentially explosive atmosphere
(page 216).
Wear protective eyewear.
Wear protective gloves.
It is the user’s responsibility to follow manufacturer’s safety and operating instructions. The
client’s organization has the responsibility to develop and maintain occupational safety and
create a safety culture where individuals are expected to follow safety instructions at all
times. Any negligence towards safety instructions or failure to comply with safe practices
should not be tolerated. It is the manufacturer’s responsibility to produce goods that are
safe to use when instructions are followed.
The process medium may be hot or otherwise hazardous. Use shields and protective
clothing adequate for the process medium. Do not rely on avoidance of contact with the
process medium.
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2.2 Storage conditions, packaging and
transportation
Soft shell packaging prevents damage to the refractometer. Transport the device in its
original packaging.
Before storing, remove any dirt and grease from the refractometer and make sure that it is
dry.
Storage conditions:
• Temperature: −40 °С…+40 °С (−40 °F… +104 °F)
• Humidity: No condensation
The product's shelf life is six months.
2.3 PR-23 refractometer models
The basic system of one or two sensors connected to an indicating transmitter (DTR) is the
same for all PR‑23 in-line refractometer models. However, there are dierent sensor models,
each model is adapted for dierent process requirements.
The models PR‑23‑AC and PR‑23‑AP meet the 3‑A Sanitary Standard requirements. With an
ATEX approved PR‑23‑…‑AX sensor or a FM approved PR‑23‑…‑FM sensor or a CSA
approved PR‑23‑…‑CS sensor or a Nepsi certified PR‑23‑…‑CX sensor a PR‑23 process
refractometer system can be used in potentially explosive atmosphere. Intrinsically safe
process refractometer PR‑23‑…‑IA/‑IF/‑CI can be used in hazardous locations in Zone 0 and
Zone 1. The Safe‑Drive system with a PR‑23‑SD sensor enables safe sensor insertion and
removal also when process line is in full operation.
2.4 Refractometer sensor
The following figure shows a cutaway picture of a refractometer sensor. The measurement
prism (6) is flush mounted to the surface of the probe tip. The prism (6) and all the other
optical components are fixed to the solid core module (7), which is springloaded (9) against
the prism gasket (5). The light source (3) is a yellow LED, and the receiver is a Charge
Couple Device (CCD) element (10). The electronics is protected against process heat by a
thermal isolator (8) and cooling fins (1). The sensor processor card (2) receives the raw data
from the CCD element (10) and the Pt‑1000 process temperature probe (4), then calculates
the refractive index nDand the process temperature T. This information is transmitted to the
indicating transmitter.
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1
2
3
4
5
6
7
8
9
10
Figure 2 Sensor structure
1Cooling fins
2Sensor processor card
3Light source
4Temperature probe
5Gasket
6Prism
7Core module
8Thermal isolator
9Disc spring
10 CCD element
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3. Mounting sensor
Choose the sensor mounting location with care to ensure reliable readings from the process.
Some basic rules, described in this section, apply to all sensor models. The model specific
instructions can be found in Sensor specifications (page 99).
• For the Sanitary compact refractometer PR‑23‑AC see Sanitary process refractometer
PR‑23‑AC (page 100)
• For the Probe sanitary refractometer PR‑23‑AP see Sanitary probe refractometer
PR‑23‑AP (page 113)
• For the Process probe refractometer PR‑23‑GP see Probe process refractometer
PR‑23‑GP (page 131)
• For the Teflon body refractometer PR‑23‑M and Teflon body semicon refractometer
PR‑23‑MS see Teflon body refractometer PR‑23‑M/MS (page 146)
• For the Saunders body refractometer PR‑23‑W see Saundersâ body refractometer
PR‑23‑W (page 154)
• For mounting an ATEX/FM/CSA approved sensor in explosive atmosphere, see
Installation (page 219)
• For mounting an intrinsically safe refractometer PR‑23‑…‑IA/‑CI, see Intrinsically safe
refractometers PR‑23‑…‑IA, PR‑23‑…‑IF and PR‑23‑…‑CI (page 161)
• For mounting of the Safe-Drive system with the PR‑23‑SD sensor, see Safe‑Drive
mounting (page 175)
3.1 Choosing sensor mounting location
A PR‑23 refractometer sensor can be located either indoors or outdoors in most climates.
However, when locating a sensor outdoors, make sure to provide some basic protection
against direct exposure to sunlight and rain. Take special care if the pipe wall is translucent
(for example of fiberglass), as light from outside reaching the prism through the pipe wall
may disturb the measurement.
The mounting location needs to be such that sediments or gas bubbles cannot accumulate
by the sensor. Good flow velocity is essential in keeping the prism clean.
If the process pipe vibrates, support the pipe. A vibrating pipe might
damage the in-line sensor mounted on it.
CAUTION!
Always check that the sensor head is kept cool enough; the sensor head should not be too
hot to keep a hand on. The sensor cover should not be exposed to high temperature
radiation. In most cases, draft and natural convection provide sucient air cooling if the air
gets to flow freely around the sensor head.
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17

Additional cooling is necessary when the ambient temperature is higher than 45 °C (113 °F)
or when the process temperature is above 110 °C (230 °F) and the ambient temperature is
above 35 °C (95 °F). The air cooling is improved by blowing pressurized air against the
sensor cover. The pressurized air can be supplied by the ventilation system. If no air is
available it is also possible to install water cooling with PR‑10038 cooling cover (except for
PR‑23‑SD where sensor head needs to be kept in original size for insertion and retraction).
Always mount the sensor so that the interconnecting cable points
downwards from the sensor head.
CAUTION!
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