Cerlic CTXP User manual

2005-07-27 MANE07/05 Ver 2.17
CTXP
Flow-through
Polarized Consistency Transmitter

Page 2
TABLE OF CONTENTS
1Introduction ................................................................................................ 3
2A few words about this manual ................................................................ 3
3Design......................................................................................................... 3
4Measuring principle ................................................................................... 3
5Unpacking the CTXP flow-through Sensor.............................................. 4
Optional parts can be ordered:............................................................................................ 4
6Mounting of flow-through sensor............................................................. 5
Automatic flushing ............................................................................................................. 7
7Removing the sensor................................................................................. 7
8Service and maintenance .......................................................................... 7
9Menu for CTXP sensor .............................................................................. 9
Settings................................................................................................................................ 9
Calibrate.............................................................................................................................. 9
Cleaning Press “ENTER” to go to sub menu for Cleaning program............................... 9
Scale / Alarm .................................................................................................................... 10
System............................................................................................................................... 10
10 Calibration ................................................................................................ 11
Multiple Calibration curves.............................................................................................. 11
Calibration points.............................................................................................................. 12
Negative values................................................................................................................. 12
Calibration screen............................................................................................................. 13
Automatic adjustment of the calibration .......................................................................... 14
Getting good measurement ............................................................................................... 14
Zero Calibration................................................................................................................ 15
Sample point Calibration .................................................................................................. 15
Calibration with multiple points....................................................................................... 17
11 Deposit compensation, and alarm.......................................................... 17
12 Scaling ...................................................................................................... 18
13 In-Depth Technical Description .............................................................. 18
14 Technical data .......................................................................................... 20
Certificate of conformity: ................................................................................................. 20
Optional parts can be ordered:.......................................................................................... 20
15 Dimensions............................................................................................... 21
CTXP 03/25...................................................................................................................... 21
Appendix 1. Sample instructions - manual test........................................... 22
Appendix 2. Support information.................................................................. 23
Appendix 3. Setup information ..................................................................... 25

Page 3
1Introduction
The CTXP 03/25 consistency transmitter has been developed to measure fiber consistencies
as a function of the ability of fibers to depolarize a polarized beam of light. In conjunction
with the BB2 signal processing unit, fiber consistencies can be measured more or less inde-
pendently of the particle consistencies in applications primarily in the pulp and paper indus-
try. Examples of such applications would be monitoring of ultra filtrate, monitoring of vor-
tex cleaner steps, consistency control prior to the paper machine headbox, and retention con-
trol.
2A few words about this manual
This manual primarily contains information about Cerlic's CTXP 03/25 consistency trans-
mitter. Transmitter functions as well as the measuring principle are discussed, but the man-
ual primarily describes the applications and the starting up of the CTXP 03/25 when it is
connected to the BB2. Menu functions and technical data of the BB2 control box can be
found in the BB2 service manual
3Design
The CTXP 03/25 is made from acid proof stainless steel and is mounted with pipe fittings
(DN25) directly onto a 25 mm (1") pipe. The transmitter has an internal design providing
superior cleaning properties, which permits precise and reliable measurement with the least
amount of maintenance possible, even in critical applications. The measuring window of the
steel cell is made from quartz glass (suprasil). Electronic and optical components are well
protected within the steel shell to handle very demanding environments.
A shielded 10 m (33’) cable is used for signal transmission between the sensor and the BB2
control box. The cable sheath is made of polyurethane and is highly resistant to aggressive
materials and fluids.
4Measuring principle
The CTXP 03/25 measures through the medium. The transmission is made with polarized,
monochromatic light. The measuring principle is based on the ability of fibers to depolarize
the light to a much greater degree than solid particles. The light source consists of a bright,
light-emitting diode which is pulsed with high power. The light is filtered so that only one
plane of polarization is emitted. Two detectors measure the V and H polarization planes. The
detector signals are processed in the BB2 and are presented as fiber consistency. The tem-
perature is measured by the transmitter to be used for temperature compensation of the
measured value. It can be read in the BB2 box, and used as secondary value when a transmit-
ter id configured to use both analog outputs of the BB2. The temperature is not a precision
measurement, but shall be seen as an indication.
Cross section of the CTXP 03/25.

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5Unpacking the CTXP flow-through Sensor
The unit has been tested and approved before delivery from the supplier. Please check to
confirm that no visible damages have occurred during shipment.
Damages
If damages occurred during the shipment, immediately contact the UPS or truck line as well
as your Cerlic representative. The shipment can be returned only after contact has been made
with Cerlic.
Packaging
The original packaging is designed to protect the equipment and should be used for storage
or if the goods must be returned.
Content
Please check that the content corresponds to your order and packing list.
Every shipment should include:
CTXP Sensor, P/N depending on the type of sensor.
Optional parts can be ordered:
•Spare Butt Weld End DN25 - 30x25 mm, for CTXP 03/25 P/N 11203082
•25 mm hose adapter DN25, for CTXP 03/25 P/N 10305122
•33 ft. (10 m) signal cable. The cable can be extended up to P/N 20805510
330 ft. (10x10m).
•Y-splitter, to connect two sensors to one BB2 P/N 21505534
•Connection box for two sensors to one BB2 control box P/N 11505748
with 3 ft. (1m) cable to connect to BB2

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6Mounting of flow-through sensor
The CTX 20/25 is mounted directly in a 1” (25mm) pipe. The sensor shall always be
mounted with its glass windows vertically (the cable connector pointing downwards). With
larger pipes, a 1” by-pass line should be used depending on consistency. Normally, installa-
tion in a by-pass pipe should be done according to the picture below.
There are three possibilities to mount the CTXP sensors, NPT-couplings (standard delivery
in the US), Butt weld end connection (standard delivery except for the US), or Hose connec-
tion. See the Dimension section for more information.
•The inlet of the by-pass pipe should be located where the stock and dilution water are
well mixed and the flow is turbulent. Appropriate distance from a pump discharge or
a pipe elbow is about five pipe diameters downstream (b).
•The by-pass pipe should be as short and straight as possible.
•A turbulent flow gives a better representation of the consistency. In order to obtain
the highest possible flow rate in the by-pass pipe, install the by-pass pipe before an
elbow or reduce.
•It should be noted that the distance between the point where the dilution water is
added and the measuring point should be as short as possible, but not less than five
times the pipe diameter. Longer distances can add delay or lag time to your control
loop.
Please carefully observe the information below concerning installation in by-pass pipes.
Incorrect installation can result in measuring problems.

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•Installing the sample or bypass line in a vertical pipe will reduce the influence of en-
trained air in the process liquid and the tendency for laminar flow.
•In order to avoid the water film on pipe walls, the sample or by-pass pipe should ex-
tend at least ¾” (20mm) (a) into the pipe. Horizontal pipes should have the sample
inlet located between 20°-70°on either side of the pipe.
•When measuring pulp stock, the inlet for the by-pass pipe should be inserted with
the stream at an angle of 45°and the end of the by-pass pipe should be cut parallel
to the pipe wall.
•If there is any risk of resin coating, splinters, rags, wires or twigs, then the measur-
ing inlet should be inserted with the flow at an angle of 30°and the discharge should
be to an open tank via a throttling valve.
•The diameter of the by-pass pipe (d) should be 1” (25 mm) and should not have any
throttling valve or pipe bend closer than 20” (0.5 meter) before the sensor (c).
•The by-pass pipe should be made so that dewatering of the pulp stock is avoided at
shutdown. If there is a risk for this, then the valve (V1) upstream the sensor should
be actuated and controlled in sequence, i.e. the valve closes when the pump stops.
•The flow rate (v) of the by-pass pipe should be at least equivalent to the main pipe
but not less than 1.5 f/s (0.5m/s). At slower rates, there is a risk for dewatering and
build up on the glass windows. For pulp stock with resin and printing ink, the flow
rate should double.
•If the flow through the by-pass pipe is so great that there is cavitation in the sensor,
then the valve after the sensor should be throttled back.
•The temperature of the sensor must not exceed 150°F (65°C).
•Install the sensor so that it will not be exposed to considerable and fast changes in
temperature.
•Avoid installation spots where the sensor is exposed to severe cold weather.
•Avoid installation spots where the sensor is exposed to direct sunlight to keep the
temperature within limits.
•Protect the sensor from high pressure spraying during cleaning.
•The sensor should never be submerged under water.
•Always install the cables between sensor and control box in conduit when possible.
•Install the sensor in a way that it is not susceptible to vibrations.
•The sensor must not be removed while still under process pressure.
•The sensor must not be used as a ground point for welding.
•If welding is to be done on the pipe system, then the cable and the sensor should be
removed.
•Always remount the protective cover on the sensor connector when the cable is re-
moved.

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Automatic flushing
Two three-way valves can be used to automatically flush the sensor with water. The flush
water temperature shall be close to the temperature of the measured media to avoid tempera-
ture stress of the sensor. In some applications where dilution of the measured media is al-
lowed, only one three-way valve can be used, and the flush water can go out the same way as
the media. The valves before the meter must not in any way throttle the flow when open. If
there is a risk of turbulence in the valve, it must be placed more than 20” (0.5 meter) before
the sensor.
Sometimes the sensor may need manual cleaning using a bottle brush and diluted acid. By
mounting a T-pipe and a ball valve with a plug on the outlet, the sensor can be manually
cleaned without first removing the sensor. The media valves are first closed, the sensor is
flushed with water, and finally the plug is removed to let the brush into the sensor.
7Removing the sensor
•Close all valves to isolate the sensor.
•Disconnect the sensor from the by-pass pipe by using the couplings on each side of the
sensor. Remove the sensor and save the Teflon gaskets for reassembly.
•Clean the sensor with a clean cloth. Do not use a wire brush!
•Flush through the sensor thoroughly.
Before the sensor is disconnected the valves in the by-pass pipes must be closed. Make sure
that no flow passes through the pipe. If the sensor is disconnected under process pressure
this could cause serious injury or even death. Cerlic does not accept any responsibility for
accidents caused when the sensor is disconnected while still under line pressure.
8Service and maintenance
The sensor does not require much maintenance. In some applications the measure cell may
need to be cleaned. Use warm water and a small bottle brush to clean the measure cell; do
not use a metallic brush or sharp tools. Hydrochloric acid can be used to dissolve coating in
the measure cell. Plug one end of the cell and fill it with 5% HCl. Let the sensor be for a
couple of hours, then flush the cell with plenty of clean water. Repeat the treatment if neces-
sary. If Hydrochloric does not solve the coating other chemicals may be used as long as they
don’t affect the O-rings made of Viton.
Media
in
Waste
Flush wate
r
Media
out
Plug for brush
T
-
pipe

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The sensor housing may not be opend except by Cerlic service personel. Opening the sensor
housing will void all warrenty.

Page 9
9Menu for CTXP sensor
Use or to select the sensor in the main display. Press ENTER for five seconds to access the
menu for the selected sensor.
Settings
Tag Name of the sensor (10 characters) shown in the main display.
Calibration Curves ”A”-“D”, or “Ext”. Tells BB2 which one of the four calibration
curves to use. “Ext” will allow you to use the three digital inputs to
change curves from a remote location.
I-Time Integration time in seconds, for dampening of output signal
Integrate ”Normal” or “Extra”, Normal integrate the raw values, Extra addi-
tionally integrate the calculated consistansy value
Unit ”%”, ”ppm”, ”g/l”, or ”mg/l”
Analog ”None”, ”Out 1”, ”Out 2”, or ”Both”. Analog output for the sensor
Second ”Temp”, “Clean”, “Raw” or ”=Prim”. If “Both” is chosen above, Out 1 will
always give the primary value. Out 2 will either give the temperature
scaled 0-100°C, the measured value at the last flushing, Raw values (for
test), or the same signal as Out 1. The temperature is additional infor-
mation, not a precision measurement.
Calibrate
Selected Cal The selected curve ”A”-“D”, or “Ext”. Tells BB2 which one of the
four calibration curves to use. “Ext” will allow you to use the three
digital inputs to change curves from a remote location.
Used Cal The currently used curve ”A”-“D”, same as selected except when
“external is selected.
Adjust ”No”, ”Store” or ”Lab”. Stores the reading of the meter when a sam-
ple is taken, and can then automatically adjust the sample value
when the sample analyzed by lab is different to the reading.
Take sample “No”, “Zero”, “# 1”-“# 5”, see section 12 for more information.
Sample # 1 Lab test – consistency/suspended solids value for Sample # 1
Sample # 2 Lab test – consistency/suspended solids value for Sample # 2
Sample # 3 Lab test – consistency/suspended solids value for Sample # 3
Sample # 4 Lab test – consistency/suspended solids value for Sample # 4
Sample # 5 Lab test – consistency/suspended solids value for Sample # 5
Cleaning Press “ENTER” to go to sub menu for Cleaning program
Cleaner ”None”, ”Flush”, or ”Brush”
Interval. min 000- 999 minutes, time between cleaner cycles
Length sec 000 – 999 seconds, duration of cleaning cycle. A brush will do as
many strikes as it can start within this time, always at least one.
Freeze sec 0-999 seconds, freeze time of output after a flushing cycle
Relay ”-”, ”#1”, or ”#2”. Pick relay to send signal to “Brush” or “Flush”
valve. These are the same relays that can be used for “Alarms Re-
lay” above.
Next time The next scheduled cleaning time, Pushing “Enter” on this line will
set the time to current time, and will start a cleaning cycle. Used for
testing the “Brush” or “Flush” system.
Clean The consistency value recorded at the end of the last flush cycle.

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Scale / Alarm
Max 0-99.9 % or 0-99999.9 ppm. mg/l, or g/l (units selected in the “Set-
tings” menu), equal to 20 mA output signal.
Min 0-99.9 % or 0-99999.9 ppm. mg/l, or g/l (units selected in the “Set-
tings” menu), equal to 4 mA output signal.
Hi Alarm 0-99.9 % or 0-99999.9 ppm. mg/l, or g/l (units selected in the “Set-
tings” menu), a value of zero inactivates the alarm
Low Alarm 0-99.9 % or 0-99999.9 ppm. mg/l, or g/l (units selected in the “Set-
tings” menu) , a value of zero inactivates the alarm
Alarm Relay ”-” ”#1”, ”#2”, or ”#1 and #2”. Check that the relay is not used for
cleaning
System
Type Type of sensor, read only
Serial Serial number of the sensor, read only
SoftW Software version of the sensor, read only
Temp Sensor temperature, read only
MaxTemp The highest temperature the sensor has been exposed to, read only
Samples Sub menu to view SA values and consistency or suspended solids
values used for this calibration curve. This is a READ ONLY Section.
Used Cal The currently used calibration curve ”A”-“D”.
SA 0 SA value for zero sample
SA 1 SA value for sample # 1
Cons 1 Lab test - consistency or suspended solids value for Sample # 1
…. SA and Cons repeated for samples 2 to 5
Info This menu is for Cerlic internal use, it may change without notice
MS Linearized light signal, which are SA values in calibration chart
Con Unit value in %, ppm, mg/l, or g/l after MS value has been converted
to units due to sample values. This is displayed on main screen
SA 0 SA value for zero sample
SA 1 SA value for sample # 1
Cons 1 Lab test - consistency or suspended solids value for Sample # 1
Ch1a Raw value for channel 1
Ch2a Raw value for channel 2
Ch1 Raw value for channel 1, compensated for changed intensity
Ch2 Raw value for channel 2, compensated for changed intensity
Ch1/Ch2 Relation between channel 1 and 2
Intensity Currently used intensity
Zero Int Intensity for clear water, set during zero calibration
I-offset Intensity offset, set during zero calibration
Samp/s Number of samples per second
Service Not accessible for users.

Page 11
10 Calibration
The BB2 has a self-optimizing calibration algorithm/curve able to handle several calibration points
and calibration curves in order to give maximum measuring precision in difficult applications.
Usually however, a single point calibration is preferred. After a calibration has been carried out,
make it a habit to look at the calibration curve in the sensor information screen to make sure it
represents a smooth line without ant sharp bends.
It is important that the sensor has been in operation for 30 minutes before a calibration is done.
This is for the electronics and temperature to stabilize. Make sure the lab sample is entered in the
correct unit. Unit is selected in the sensors setting menu.
Multiple Calibration curves
The CTXP sensors have the possibility to define four independent calibration curves to han-
dle different types and qualities of pulp. Each curve has up to five calibration points. All four
curves have a common zero calibration point. The four calibration curves are properties of
each sensor. That is they are stored in the sensor and can not be used by another sensor. The
choice of calibration curve can be done in the setup or calibration menu, or from an external
device. When external selection is chosen in the setup menu of the sensor, the sensor will
use the curve decided by the state of the digital inputs of BB2. The external selection is a
property of BB2. If more than one sensor connected to one BB2 is set up to use external se-
lection, they will change simultaneously when the state of the inputs changes. If the digital
inputs of a BB2 selects curve “A” all sensors connected to this BB2, set up to use external
selection, will use their own curve “A”.
The calibration curve selection is done in the sensor menu. If ”Extern” is selected the state
of the digital inputs of BB2 decide what calibration curve is used.
Curve B
Curve A
Curve C
Curve D
A
B
C
D
E
x
tern
000
001
01
x
1
xx
BB2
digital
inputs
Men
u choice

Page 12
Calibration points
To calculate the consistency or concentration out of the depolarization the sensor uses a calibration
curve. The curve is built up of the zero calibration point and at least one calibration point. Each
point has a sample value and a consistency value. To be used a point needs both values, the sample
value is set by “take sample” in the calibration menu, and the consistency value is manually en-
tered in the same menu after having analyzed the actual consistency at the time the sample was
taken. A calibration point can be disabled by setting the consistency value to zero. In most applica-
tions one calibration point in addition to the zero sample is the best solution, adding more samples
then just confuses the measurement. The only cases more than one calibration point is useful is
when the measurement turns out to be non linear, or when the sensor needs to be very accurate at
widely separated consistencies.
The zero calibration defines the zero point used as a reference for all other calibration points.
The other points define the relation between a certain depolarisation and real consistency.
Negative values
The sensor contentiously compares the depolarization of light to its calibrated points. If, for some
reason, the depolarization is less than when the sensor was zero calibrated, the meter shows a
negative consistency. This is not a fault, it just indicates the liquid in the sensor depolarizes less
light than the liquid used as zero reference. Please contact Cerlic service if this is a problem for
you.
Depolarization
Consistency
0
0

Page 13
Calibration screen
The CTXP sensor information menu is the calibration curve screen. To change between the
main menu and the calibration screen, press and ENTER simultaneously.
BB2 uses at least a zero sample and one sample (two point’s calibration). Up to five samples
may be used to create a calibration curve (multi point calibration). The samples are sorted
internally in order of signal intensity. The sample numbers however, doesn’t change, only
the order they are used. The calibration menu displays sample values placed in a graph.
•X-scale displays consistency/suspended solids, where min –value (4 mA output) is shown
to the left and max -value (20 mA output) is shown to the right.
•Y-scale displays the depolarization due to fibers from the sensor light source. BB2 uses
the depolarization values to calculate which measuring signal corresponds to min-
consistency/suspended solids and max-consistency/suspended solids.
•Actual measuring value is indicated with an arrow that moves up and down to the left of
the Y-scale axis. The current calibration curve (A-D) is shown to the right.
•Samples that are not within the chosen scale of the active sensor are not displayed on the
calibration screen. However, these samples are still used in the calculations. If you want
to see a point outside the sensor scale, then you may temporarily change the scale in the
Scale / Alarm sensor menu.
If the sample values are switched or the lab result is incorrectly performed, then the calibra-
tion curve will be incorrect. Such a mistake is easy to discover on the calibration screen
since a part of the calibration curve will go in the wrong direction. Different measuring val-
ues should never correspond to the same consistency / suspended solids.
Incorrect calibration!


Two point calibration
Several point calibration
The curve goes backwards be-
cause two samples have been ex-
changed when entering the lab re-
sults. Higher Y-value must mean
higher X-value. The curve must
have a direction upwards and to
the right.

Page 14
Automatic adjustment of the calibration
The function ”Adjust” in the calibration menu is used to automatically adjust the calibration
in an easy way. When a sample is taken to be analyzed by lab, BB2 stores the reading. When
the sample has been analyzed, the result is keyed in to the BB2 who will compare it to the
stored reading and calculate a new setting for the sample value. Automatic adjustment only
works for single point calibrations and is primaryli intended as an easy way to get started
with a new sensor. Once the automatic adjustment is done, and the sensor gives a sensible
reading, we recommend to use statistical adjustment to get a higher accuracy over time, se
below.
Running an automatic adjustment:
It is important that the instrument has been turned on for about 30 minutes prior to calibra-
tion so that the sensor and electronics can stabilize. Even though the sensors have daylight-
filters they are sensitive to the infrared parts of the sunlight.
Select the sensor to be calibrated in the menu by using or arrows
Press ENTER for approximately five seconds to enter the sensor menu.
Use and arrows to select “Calibrate” and select “Adjust”, and then “Store”. Press
ENTER.
•Press ENTER when taking the sample.
•Get the sample analyzed.
Press ENTER for approximately five seconds to enter the sensor menu.
Use and arrows to select “Calibrate” and select “Adjust”, and then “Lab”. Press
ENTER.
Press ENTER to use the stored reading , or to key in a value.
Key in the result of the lab analyze, then press ENTER.
BB2 will show current and suggested new value for ”Sample 1”, acknowledge the change by
pressing ENTER or abort using or .
Getting good measurement
Statistic adjustment of the lab sample value is a much better way to good measurement than
frequent calibration. This is done comparing the lab results with the instrument reading over
time. If a systematic discrepancy is detected, the value of the lab sample used in BB2 is
changed accordingly. If for example several lab results for a period of time in average shows
5% more than the instrument, the sample value in BB2 shall be increased 5% of its value,
e.g. if the sample value is 10000 mg/l it shall be changed to 10500. Using statistic method
will increase the accuracy and reliability of the measurement as time passes while new cali-
brations will start from scratch. An Excel sheet to help doing statistical adjustment of the
calibration can be downloaded from http://www.cerlic.com

Page 15
Zero Calibration
The sensor is zero calibrated at the factory, and does normally not need to be zero recali-
brated. Before doing a zero calibration make sure that it is really needed. Make sure the win-
dows are clean, and use clean de-aerated water to check the meter reading. Tap water is best
de-aerated by leaving the water in an open bucket for at least two hours. Refer to chapter
”Removing the sensor” before the sensor is disconnected
The zero point is common for all four calibration curves. If the zero point is re-calibrated it
will affect all other used calibration points in all calibration curves of the sensor.
To run a zero calibration:
•Remove the sensor from the process line and plug one end of the sensor with a rubber
stopper or plug.
•Lay the sensor on its side and fill with de-aerated water until the windows are covered.
NOTE!
The sensor must not be submerged into the bucket! Plug one end of the sensor and
pour the water into the opening at the other end.
•Select the sensor to be calibrated in the menu by using or arrows
•Press ENTER for five seconds to enter the sensor menu.
•Use and arrows to select “Calibrate” and select ”Take sample”.
•Select ”Zero” and press ”ENTER”.
•If you really want to destroy the existing calibrations, change “No” to “Yes”, then press
”ENTER”
•After you have filled the sensor with water, then press ”ENTER” again.
•Wait for the zero calibration to finish. It will take approximately thirty seconds before
the unit returns to the menu.
For more information concerning use of menu/dialogues, refer to the manual for BB2 control
box.
Sample point Calibration
For best possible results when calibrating with one point, the consistency / suspended solids
sample should be similar in concentration to the usual range of the liquid or medium. It is
however easier to use statistical tuning if the sample point is higher when measuring very
low consistencies or concentrations.
NOTE!
Look at the calibration curve in the sensor information screen to make sure it repre-
sents a smooth line without ant sharp bends.
Note that the curve always must be ascending and going right, a descending or left go-
ing curve indicates that one measuring value may correspond to incorrect consistency /
suspended solids values.

Page 16

Page 17
Calibration with one point is done in the following way:
•Open the valve on the upstream side of the sensor completely.
•Open the valve on the downstream side halfway.
•Go to the CALIB menu and select “Take sample – #1”.
•Press ”ENTER”.
•Press ”ENTER” to calibrate, take a sample according to sample instruction
”APPENDIX 1” while the sensor is calibrating.
•Mark the sample with sample (1).
•Take the sample to the lab for analysis.
•Enter the suspended solids or consistency value that was determined by the lab in the
menu under ”Calibrate – Sample #1”
Calibration with multiple points
•Open the valve on the upstream side of the sensor completely.
•Open the valve on the downstream side halfway.
•Go to the calibration menu and do the following:
•Select "Calibrate” and press ”ENTER”.
•Select a sampling number “1-5” and press "ENTER". Take sample.
•Press ”ENTER” to calibrate, take a sample according to sample instruction
”APPENDIX 1” while the sensor is calibrating.
•Mark the sample with the sample number.
•Repeat the steps above with a new sample for each desired sample point, up to 5 points
may be entered. Make sure you get different concentration or consistency value for each
sample point.
•Take the samples to a laboratory to determine the concentration.
•Record the lab value in the menu ”Calibrate” under ”Samples # 1 - 5".
11 Deposit compensation, and alarm
BB2 has a choice to output the measured value during the last flushing on its second 4-20
mA output. This is useful in demanding applications where it can be used to trigger an alarm
to manually clean the sensor when it reaches a certain level, those make sure the sensor is
cleaned when needed, but not when it’s not needed. The signal can also be used to compen-
sate the measure value for deposits in the sensor, extending the interval between manual
cleaning.

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12 Scaling
On the "Scale / Alarm" menu there are two options showing at which consistency or solids
concentration, that the output signal will give 4 mA and 20 mA respectively. There are also
two options showing at which consistencies or solids the BB2 will give an alarm for low or
high consistency or solids respectively.
MAX sets the 20 mA point output
MIN sets the 4 mA point output
Hi-Alarm sets the High Alarm set point, a value of zero inactivates the alarm
Low-Alarm sets the Low Alarm set point, a value of zero inactivates the alarm
13 In-Depth Technical Description
The measuring principle is based on the ability of fibers to depolarize NIR (Near Infra Red)
light polarized into one plane. The light source is a pulsed diode. Two detectors register the
V- and H-planes of the transmitted light, and the BB2 makes a calculation of these signals to
obtain the current fiber consistency.
The following diagrams show how the CTXP reacts to fibers and different fillers as com-
pared to how a CTX transmitter with a so called straight transmission reacts.
Sulfate pulp (hardwood pulp) / Titanium dioxide
Since titanium dioxide consists of very small particles, its ability to block out light is very
good. That makes the CTX react very strongly to an addition of TiO2. The measuring prin-
ciple of the CTXP makes it almost completely insensitive to variations of light intensity in a
nominal measuring interval, and therefore the CTXP does not react as strongly to TiO2as
the CTX.

Page 19
Sulfate pulp (hardwood pulp) / Clay
The ability of clay to block out light is relatively good. That makes the CTX react as if the
fiber consistency increases with an addition of clay. The measuring principle of the CTXP
makes it almost completely insensitive to variations of light intensity in a nominal measuring
interval, and therefore the CTXP does not react as strongly to clay as the CTX.
Groundwood pulp / Chalk
Groundwood pulp blocks out light to a very high degree. Therefore, the CTX does not react
to the same degree to the chalk, which also blocks out light to a relatively high degree. The
CTXP reacts to a lesser degree to chalk than to titanium dioxide, but more than if one com-
pares with clay.

Page 20
14 Technical data
CTXP 03/25 P/N 11305537
Material 316SS (SIS2343)
Process connection DN25, 1” npt connections are standard in the US,
butt weld ends 30x25 mm are standard outside the US
Process pressure 365 psig (PN25)
Process temperature 32…+150°F (0…+65°C)
Light source GaAs diode, 880 nm monochromatic
Measuring principle Straight transmission and depolarization, 3 mm measuring line
Connection cable 5-pin M12-connector
Weight incl. cable 8 lbs. (3.7 kg)
Measuring range Min: 0 – 0.1%
Normaly: 0 – 1%
Max Consistansy 1.5 – 2% (depending on pulp type).
Certificate of conformity:
The CTX sensors along with their central unit BB2 are in conformance with the following
EC Directive(s) when installed in accordance with the installation instructions contained in
the product documentation:
73/23/EEC Low Voltage Directive as amended by 93/68/EEC
89/336/EEC EMC Directive as amended by 92/31/EEC and 93/68/EEC
The following standards and/or technical specifications have been applied:
EN 61000-6-4:2001 Electromagnetic compatibility (EMC) Part 6-4
Generic standards – Emission standard for industrial environments
EN 61000-6-2:2001 Electromagnetic compatibility (EMC) Part 6-2
Generic standards - Immunity for industrial environments
EN 61010-1:2001 Safety requirements for electrical equipment for measurement,
control, and laboratory use
Optional parts can be ordered:
•Spare Butt Weld End DN25 - 30x25 mm, for CTXP 03/25 P/N 11203082
•25 mm hose adapter DN25, for CTXP 03/25 P/N 10305122
•33 ft. (10 m) signal cable. The cable can be extended up to P/N 20805510
330 ft. (10x10m).
•Y-splitter, to connect two sensors to one BB2 P/N 21505534
•Connection box for two sensors to one BB2 control box P/N 11505748
with 3 ft. (1m) cable to connect to BB2