Sanitary Standard Compliance; Compact Process Refractometer Pr-23-Gc; Pr-23-Gc Sensor Model Code - Vaisala K-PATENTS PR-23 Series Instruction Manual

9 Sensor specifications
To ensure EHEDG compliant installation, follow the mounting specifics provided on
the mounting drawing supplied by Vaisala with each PR-23-AP refractometer ordered
with the -EH option.
9.4.8 3A Sanitary Standard compliance
The user should ensure that the refractometer is not a source of contamination to
product due to damaged or worn product contact surfaces. Misuse (e.g. too long prism
wash time or too high wash pressure) or mishandling may result in metal scratches
or roughened surfaces. Such surfaces may not stay clean in processing.
Vaisala offers a 3A Sanitary Standard Accepted repair and maintenance package in
which all wetted parts, prism, gaskets and dryer are replaced. Note that this repair
service can be completed by 3A authorized service center only (Vaisala factory or re-
gional headquarters).

9.5 Compact process refractometer PR-23-GC

Compact process refractometer PR-23-GC is designed for the general industry small
pipeline and bypass line applications e.g. in chemical, oil, gas, petrochemical and kraft
pulping processes.

9.5.1 PR-23-GC sensor model code

MODEL AND DESCRIPTION
PR-23 = Sensor
Sensor model
-GC = General purpose compact
Refractive Index range limits
-73 = n 1.320–1.530 (0–100 Brix) Sapphire prism
D
-74 = n 1.260–1.470, Sapphire prism
D
-82 = n 1.410–1.620, YAG prism
D
-92 = n 1.520–1.730, GGG prism
D
Process connection
-K = Sandvik L coupling 76.1, insertion length 14 mm
Sensor wetted parts material
SS = AISI 316 L
HA = Alloy 20
HC = Alloy C276 / ASTM C276
NI = Nickel 200/201
TI = Titanium ASTM B348 GR 2
SU = AISI 904L
XS = Duplex 2205 / SAF2205
Electrical classification
-GP = General Purpose
-AX = ATEX and IECEx certified Ex II 3 G, Ex nA IIC T4 Gc (up to Zone 2) (T
-IA = ATEX and IECEx certified Ex II 1 G, Ex ia IIC T4 Ga (up to Zone 0) (T
-CS = CSA certified Class I, Div.2, Groups A, B, C, D T4 (T
-FM = FM certified Class I, Div.2, Groups A, B, C, D T6 (T
-IF = FM certified to US and Canadian standards Class I, Div.1, Groups A, B, C, D T4 (T
Sensor housing
-SC = Stainless steel AISI 316
(A) Available with STR Indicating Transmitter and IS isolator only
-20 ... +65°C)
amb
-20 ... +65°C) (A)
amb
-20 ... +45°C)
amb
-20 ... +45°C)
amb
97
MODEL
PR-23
-GC
-73
-74
-82
-92
-K
SS
HA
HC
NI
TI
SU
XS
-GP
-AX
-IA
-CS
-FM
-20 ... +45°C) (A) -IF
amb
-SC