K-Patents PR-23 User Manual

6 Conguraon and calibraon
49
NAMUR NE 43 uses the 3.8 to 20.5 mA signal range for measurement information,
with ≥21 mA or ≤3.6 mA to indicate diagnostic failures (see Figure 6.11). With that
information, it is easier to detect a failure condition on a refractometer, for example,
it clearly tells you whether you have an empty pipe or a failed instrument.
0 3.6
3.8
4
20
20.5
21
mA
failure OK
Measurement Data
failure
Figure 6.11 Default mA output values
− 6 MANUAL SET allows you to set different output values to check the output signal.
Press the BACK key to return normal output function.
Note: If you want to ’turn off’ the mA output, select NOT DEFINED in the Source menu.
6.4 Calibrang the concentraon measurement
mA OUTPUT
FIELD CALIBRATION
CHEMICAL CURVE
n
D
CCD
TEMP
Pt-1000
Indicating
transmitter
DTR
Sensor
CONC
CALC
1.
2.
3.
4.
5.
6.
DAMPING
Figure 6.12 The six layers of
concentraon calibraon
The concentration calibration of
the K-Patents inline refractome-
ter PR-23 is organized in six lay-
ers.
1. The information from the CCD
element and the Pt-1000 tem-
perature element. The po-
sition of the shadow edge
(Figure 1.4, “Optical image
detection”) is described by
a number called CCD and
scaled from 0–100 %.
2. The sensor calibration: The
actual refractive index n
D
is
calculated from the CCD value.
The process temperature is
calculated from the Pt-1000
resistance. The sensor out-
put is n
D
and temperature
TEMP in Centigrade. Hence,
the calibrations of all PR-23 sensors are identical, which makes sensors inter-
changeable. Furthermore, the calibration of each sensor can be veriied using stan-
dard refractive index liquids, see Chapter 13.

K-Patents PR-23 Specifications

General

Brand	K-Patents
Model	PR-23
Category	Measuring Instruments
Language	English