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 dierent sensor models,
each model is adapted for dierent 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 n
D
and the process temperature T. This information is transmitted to the
indicating transmitter.
Chapter 2 – Product overview
15
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