Swagelok CR-288 Concentration Monitor User`s Manual

Swagelok CR-288 Concentration Monitor User`s Manual
Swagelok® CR-288® Concentration Monitor
User’s Manual
2
Swagelok CR-288 Concentration Monitor User’s Manual
Contents
1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
Basic Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
2.0 Monitor Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
2.1 Sensor
.........................................................
5
2.2 Digital Display Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
2.3 Cable
..........................................................
6
2.4 Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
2.5 Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
2.6 Serial to USB Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
3.0 Basic Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
3.1 Sensor
.........................................................
7
3.2 Digital Display Unit (DDU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
3.3 Cable
..........................................................
9
3.4 Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9
4.0 288-connect Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1 Basic Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1.1 Opening the Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1.2 Editing and Saving Sensor Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1.3 Chemical Calibration of Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1.4 Data Graphing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1.4.1 Graph Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1.4.2 Zoom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1.4.3 Scale Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1.4.4 Shown Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1.4.5 Update Info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1.4.6 Pause Data Collection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1.4.7 Clear All Graphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1.4.8 Find Temperature Compensation Coefficient . . . . . . . . . . . . . . . . . . . 16
4.1.5 Data Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2 Advanced Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2.1 Using the Digital Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2.2 Chemical Concentration Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.2.3 Rolling Averages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.0 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.1 Re-Zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.2 Window Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.0 Monitor Operation: Stand Alone DDU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.1 Initial Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.2 Using the Analog Outputs to Collect Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.0 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.0 Glossary
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
9.0 Spare Part Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Swagelok CR-288 Concentration Monitor User’s Manual
1.0 Introduction
The Swagelok CR-288 concentration monitor
provides real-time, temperature-compensated
concentration measurement in a compact,
ultrahigh-purity package. The monitor uses an
optical system to accurately measure liquid
chemical concentrations in real time. The digital
display unit and 288-connect® software combine
convenient, scalable data interface and acquisition
options via a graphical user interface and liquid
crystal display (LCD).

WARNING
Touching live electrical parts can
cause fatal shocks and severe burns.
Incorrectly installed or improperly
grounded equipment is a hazard.
●
●
The monitor includes the following components:
●
●
Optical liquid concentration sensor
●
Digital display unit (DDU)
●
Sensor-to-DDU cable
●
288-connect software
3
●
●
Sensor
Do not touch live electrical parts.
No user serviceable parts are in
the CR-288. Refer servicing to your
authorized Swagelok representative.
Keep all panels and covers securely
in place.
Properly ground the DDU before use.
Plug the power supply unto a properly
wired receptacle.
Follow local electrical codes and
the guidelines in the manual when
installing the CR-288. Failure to do
so may create an electrical shock
hazard. Shock hazards can exist even
when equipment is properly installed.
The operator should be properly
trained and follow established safety
practices.
Cable
288-connect Software
DDU
Fig. 1 Monitor Components
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Swagelok CR-288 Concentration Monitor User’s Manual
Basic Principles of Operation
Index of Refraction
Common chemical solutions have a linear
relationship similar to the one shown in Fig. 2, with
refractive index increasing when concentration
increases. The concentration monitor incorporates
actual refractive measurement from the process
stream to obtain a true concentration value.
1.43
1.42
Index of Refraction
The sensor is an optical device that continuously
emits a monochromatic light into the process
stream and collects the reflected light on a
photodiode array, where the location of the light
is associated with a specific index of refraction
value. It also measures the internal sensor
temperature and the fluid temperature.
The DDU is designed to survey the response of up
to four sensors at one time. Index of refraction and
temperature signals from the sensors are captured
in a digital signal processor and translated into
information displayed on the LED screen.
1.41
1.40
1.39
1.38
1.37
1.36
1.35
1.34
1.33
1.32
0
5
10
20
25
30
35
40
45
Concentration, %
Fig. 2 Index of Refraction
Temperature
1.384
1.383
Index of Refraction
As a chemical solution's temperature increases,
refractive index tends to decrease in a non-linear
relationship. At a specific temperature this value
is known as the Index of Refraction (IoR). The
monitor tracks this relationship to obtain the
[email protected], which is the temperature compensated
concentration analysis.
The refractive measurements are standardized
at 20˚C to allow baseline characterization of the
relationship between changing temperatures and
the IoR. The monitor’s software determines the
[email protected] when the monitor has been exposed to
system fluid and conditions as described in this
manual.
15
1.382
1.381
1.380
1.379
1.378
1.377
1.376
1.375
1.374
20
25
30
35
Temperature, ˚C
Fig. 3 Temperature
40
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Swagelok CR-288 Concentration Monitor User’s Manual
2.0 Monitor Overview
2.1
Sensor
The sensor is designed to be mounted inline with
liquid chemical delivery tubing. Each sensor has
onboard thermistors to measure fluid and sensor
temperatures, onboard memory (2kb) to store
basic information, and is laser-etched with a
unique serial number for identification.
Internally, only sapphire and modified PTFE come
into contact with the system fluid.
Fig. 4 Sensor
2.2
Digital Display Unit (DDU)
The system uses a Digital Display Unit for
displaying concentration and temperature
readings. The DDU supports up to four sensors
and displays concentration and temperature for
each sensor simultaneously. There are eight 4
to 20 mA analog outputs, one for each sensor’s
concentration and temperature measurements,
and two digital outputs located across the top of
the DDU.
Top
The serial inputs for sensors 1 through 4 are
mounted on the bottom of the unit. When the
sensors are plugged into the DDU, information
from each sensor is displayed on the LCD screen.
Bottom
Fig. 5 DDU
Sensor 1
Input
Sensor 2
Input
Sensor 3
Input
Sensor 4
Input
Fig. 6 Digital Display Unit Sensor Ports
5
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Swagelok CR-288 Concentration Monitor User’s Manual
2.3
Cable
A 10 ft (3 m) cable is supplied with the
concentration monitor. The serial end (HD
15) connects to the DDU and the IP67 end
connects to the sensor. Cable extensions are not
recommended.
2.4
Software
Fig. 7 Cable
288-connect® software is provided on the
enclosed CD-ROM. This Windows® based
software enables sensor calibration, monitoring,
and data logging capabilities.
2.5
Power Supply
Specifications:
Input — 100 to 240 V (ac), 50 / 60 Hz, 32 W
Output — 24 V (dc)  5 %, 1 A
2.6
Serial to USB Adapter
Fig. 8 Software
The included adapter hardware and software
permit the user to connect the DDU to a USB port
if needed.
Fig. 9 Power Supply
Swagelok CR-288 Concentration Monitor User’s Manual
7
3.0 Basic Installation
3.1
Sensor
Install the sensor into a fluid system. The sensor
is not sensitive to flow direction. The sensor is
sensitive to ambient light conditions, changes in
the light conditions will effect the concentration
readings.
During operation, the fluid system must be
pressurized so that fluid comes in contact with the
sapphire optical window at all times. If bubbles or
air is in contact with the optical window the DDU
will read "sensor in air."
3.2
Digital Display Unit
The DDU may be mounted to a vertical surface
using the mounting tabs on the sides of the unit.
The terminal block should be oriented on the top,
with the sensor ports face down. This ensures that
the text on the LCD screen is oriented properly.
The DDU may also rest horizontally.
Fig. 10 Sensor with Fine Thread Flare Fittings
 WARNING
The DDU is not designed to be exposed to
chemicals and should be installed in a safe
environment such as an electrical cabinet.
Any exposure to water or other chemicals
may result in electrical shorts, corrosion,
or other damage.
To supply power, a 24 V (dc) supply with at
least 1 A maximum current capacity is required.
A 24 V (dc) power supply is included with
the monitor. A user-supplied power source
must comply with necessary electromagnetic
compatibility requirements.
Terminal Block
The DDU will use approximately 0.5 A at 24 V (dc)
when 4 sensors are connected.
Note: It is recommended that any electrical
component be grounded. Use a 14 gauge
wire attached to one of the mounting screws
to ground the DDU.
Powering the DDU Using Supplied Source
Mounting
Tabs
Mounting
Tabs
1. Snap the terminal block onto the DDU.
2. Plug the power supply into an AC outlet.
Sensor Ports
Fig. 11 DDU Front
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Swagelok CR-288 Concentration Monitor User’s Manual
Powering the DDU Using an Alternate 24 V (dc)
Power Source
1. Remove the terminal block from the DDU.
2. Remove existing wires from the power supply.
3. Place the 24 V positive (+) lead in the left most
screw terminal and screw it down tightly.
4. Place the ground (–) lead in the second
terminal from the left and screw it down tightly.
5. Replace the terminal block on the DDU.
The LCD display on the DDU shows the following
items for each sensor from left to right:
●
●
●
Two-digit ID based on the last two digits of
serial number etched on the sensor
Concentration (%) with up to three decimal
place resolution
Temperature with a two decimal place
resolution in degrees Celsius (˚C)
24 V (+)
Ground
Fig. 12 Terminal Block Removed from the DDU
Assessing Status of the DDU
The DDU unit has three LEDs to the right-hand
side of the LCD screen.
The top LED is the Power LED. It will illuminate
green whenever the device is properly powered.
The middle LED is the Communications LED. It
will illuminate green whenever a successful serial
connection is established with the 288-connect
computer software.
The bottom LED is the Error LED. It will illuminate
red when the board is getting an error signal from
a sensor.
Sensor Serial
Sensor Serial
Number
Concentration
Temperature
Number
Power LED
Communications
LED
Concentration
Port #
1
2
3
4
Power LED
Communications
LED
Error LED
Error LED
Temperature
One Sensor in Use
Four Sensors in Use
Fig. 13 CR-288 DDU LCD Display
Swagelok CR-288 Concentration Monitor User’s Manual
3.3
9
Cable
1. Align the arrows and connect the IP67 end of
the cable to the top of the sensor.
2. Connect the HD 15 end of the cable to one of
the four sensor input ports on the bottom of
the DDU.
IP67 End
3. Use a screwdriver to secure the HD 15 end to
the DDU.
HD 15 End
Fig. 14 Sensor Cable
3.4
Software
1. Run the Setup_288-connect_V366.exe
installation program found on the 288-connect
CD provided in the shipping box. An icon for
288-connect will appear on your desktop and
a default data storage location will be created
on your computer's hard drive. The default
location is C:\CR288Data but can be changed
to any desired hard drive location.
2. Connect the serial cable to the DDU and your
computer. If your computer lacks a serial port,
use the supplied USB serial port converter.
Note: A driver for the converter must be installed
prior to use. Run the installation program
found on the USB converter CD provided
with the converter kit.
It is important to use the supplied converter
as not all USB serial port converters
support the full range of functionality
needed by the monitor.
Fig. 15 Software Installer Dialog Box
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Swagelok CR-288 Concentration Monitor User’s Manual
4.0 288-connect Software
4.1
Basic Functions
4.1.1 Opening the Program
1. Launch the program by double clicking on the
288-connect icon on your desktop.
2. Click on the "Auto Open" box that appears on
the left side of the data display screen. The
message box should respond with “Opened,
Talking.”
The LCD data replication will update, showing
all current sensor information, providing a
duplicate of the display from the DDU.
4.1.2 Editing and Saving Sensor
Information
Saving Factory-Loaded Sensor Information
This function provides a way to back-up and
restore the onboard sensor information. Back-up
should be done for each sensor connected to the
DDU and provides a way to reset the sensor to the
factory loaded information.
Note: Do not use a file saved for one sensor to
restore another sensor.
Fig. 16 LCD Data Display Screen
Note: Each open session of 288-connect software
will support one DDU, which supports 4
sensors. To support more sensors, a second
session of 288-connect must be opened.
1. Identify the sensor’s port number by inspecting
the cable connection or by matching the serial
number.
2. Click the Sensor Calibration tab and select
the desired sensor from the dropdown box.
3. Click Load Memory to bring all sensor
information from the sensor memory into the
program to be viewed onscreen.
4. To save the factory loaded information to an
external file the first time the sensor is loaded,
click Save Complete Sensor Info to File
and store the resulting file (approx. 2k, with
a *.cr288 extension automatically added) in a
secure location on the computer hard drive.
5. Stored information can be restored from the
hard drive by clicking on Load Complete
Sensor Info from File and selecting the
desired file.
Fig. 17 Load and Save
Swagelok CR-288 Concentration Monitor User’s Manual
11
Editing Sensor Memory
6. Click the Sensor Info tab.
●
●
●
●
●
7.
Sensor Number
This is the number laser etched on the
sensor. This value cannot be edited.
Comments
This may be edited to any 20 character
string.
Fluid Temp Compensation Coefficient
(RIU/degC) This is the primary method
of changing the thermal compensation
behavior of the sensor. Typical values
range from –0.00004 to –0.00030. It
is recommended to edit this for each
system fluid used. See Find Temperature
Compensation Coefficient.
AO Range
The 4 to 20 mA analog outputs allow
adjustment of the concentration and
temperature ranges of the analog outputs.
See Using Analog Outputs to Collect
Data.
Rolling Averages
This can be used to increase the amount
of averaging that the DDU processor
performs on the collected data. See
Rolling Averages.
To edit a field, point and click on the field.
Enter the new information in the pop-up box
that appears.
8. To update the sensor memory to apply the
changes, click Save Memory.
9. To back-up the updated information to an
external file on the computer hard drive, repeat
step 4 using a different file name.
Fig. 18 Edit Sensor Info Window
Note: Once the sensor info has been edited, a
red text box will appear in the lower left
corner of the displayed screen indicating a
change.
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Swagelok CR-288 Concentration Monitor User’s Manual
4.1.3 Chemical Calibration of Sensor
Chemical calibration tells the sensor the
characteristics of the chemical to be monitored.
The relationship between concentration and index
of refraction is linear for most chemicals at a
constant temperature and so can be defined with
only two points. However, some chemicals do
have a non-linear relationship making it necessary
to enter additional data points. 288-connect
accepts up to ten data points to compensate for
non-linear relationships, allowing for polynomial
fits.
From the main screen:
1. Click the Sensor Calibration tab.
2. Click Load Memory.
3. Click the Chemical Calibration tab.
Follow Constructing a Chemical Concentration
Table to enter the process chemical data. Once
the process chemical has been established in
sensor memory, the sensor and software are
functional.
Constructing a Chemical Concentration Table
To add a new chemical, click the Chemical
Concentration tab and:
Fig. 19 Chemical Calibration Window
1. Change the chemical name and click Delete
All Points. This clears all data from the
chemical concentration table.
2. If the relationship between IoR and
concentration for your chemical is known:
Leave the Get [email protected] from Sensor check
box empty. Input the points from your table
by entering [email protected] and Concentration. Click
Add Calibration Point after each set of data.
Repeat until entire table has been entered.
3. If the relationship between IoR and
concentration for your table is unknown:
Determine the relationship by running various
known concentrations of the new chemical
through the sensor and building the table
manually. Use these steps:
a. Check the Get [email protected] from Sensor
box.
b. Flow the first known concentration
through the sensor.
Note: The calibration should completely span
the desired process temperature range.
Swagelok CR-288 Concentration Monitor User’s Manual
c. Enter the concentration in the
Concentration box.
d. Allow sufficient time for process
stabilization (approx. one minute), then
click Add Calibration Point.
e. Flow the next fluid concentration until
calibration is complete.
When the desired number of points have been
recorded, save them by clicking Save Current
Chemical To File, which will create a file with
a *.chem extension on the computer hard
drive. This file can then be used to import the
chemical calibration table to other sensors.
4.
Click Save Memory to update the sensor
memory.
4.1.4 Data Graphing
The software provides real-time graphical
representation of the sensor output.
These features can be accessed by clicking on the
Data Graph tab.
Update Info
Find Temp Comp
Pause Data Collection
Clear All Graphs
Fig. 20 Data Graph Screen
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Swagelok CR-288 Concentration Monitor User’s Manual
4.1.4.1 Graph Navigation
The tabs on the top and right-hand side can be
used to select what sensor data will be viewed.
The software stores the last 5000 data points
in memory for display on this graphic interface.
Since there is one point per 1.3 seconds, this
display can show up to 108 minutes of data.
4.1.4.2 Zoom
Press and hold the right mouse button while
drawing a box around the data to zoom in.
Click UnZoom or AutoScale Shown to zoom out.
4.1.4.3 Scale Adjustment
The scales may be adjusted by editing the values
in the scale labels. When this is done, the Data
Graph switches to “User Scale Axis,” meaning it
will no longer automatically resize itself.
1. Edit the scale values by clicking in the
appropriate box and entering the desired
scale.
2. Click Track Time in the lower left of the
window to continue to see new data points as
they appear.
3. Check the boxes in the second column to
superimpose linear or 2nd order polynomial
lines on the data. The lines always match the
entire data set not just the data shown, i.e. if
the graph is zoomed in to show a small part of
the data, the imposed line will not necessarily
match the shown data since it is fitted to all
the data.
4.1.4.4 Shown Data Statistics
The following values are calculated from only the
data shown in the graph. A particular region can
be viewed to learn its properties.
Standard deviation (Std.Dev.) - gives the square
root of the variance in data.
Slope - indicates if the data is trending upward
(positive) or downward (negative).
Average - the average of the measured values.
The average can be copied to the clipboard.
Select or zoom to the desired data, right click in
the average box, copy, switch to database and
paste. This feature is useful if you are collecting
data live and entering it into a database program.
Fig 21 Shown Data Statistics
Swagelok CR-288 Concentration Monitor User’s Manual
4.1.4.5 Update Info
The Update Info button updates the sensor serial
number and comment information that appears
immediately beneath the Update Info button.
Update Info can be used if a sensor comment has
been edited after data collection has started and
it is necessary to show the change on the Data
Graph screen.
4.1.4.6 Pause Data Collection
Checking this box will stop the data graph from
gathering further data from the sensor. While
the box is checked, the sensor will continue to
gather data and output to the analog outputs,
digital outputs and DDU, but the software will stop
gathering data.
4.1.4.7 Clear All Graphs
To clear the Data Graph of its collected data, click
Clear All Graphs at the bottom center of the
Data Graph tab. This removes all of the collected
data from all connected sensors from the graphic
display only. The Clear All Graphs button does not
affect data logging that is in progress, only the
graphic buffer.
The timestamp of the data log program is
preserved, so new displayed data will not begin at
time zero but rather continue from the time of the
last data point before the clear.
Note: Update Info will not change the sensor
information in data files started prior to
pressing the Update Info button. This
information has already been written
to the data file and will not be changed
retroactively.
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Swagelok CR-288 Concentration Monitor User’s Manual
4.1.4.8 Find Temperature Compensation Coefficient
Temperature changes have an effect on index
of refraction and therefore on the reported
concentration from the sensor. The Find
Temperature Compensation Coefficient function
automates a method to determine the temperature
compensation coefficient.
Fig. 22 Temperature Compensation Coefficient Screen
Using the Temperature Compensation
Coefficient Function
1. Let the sensor run for a period of time
representative of typical process temperatures
while holding the concentration of the fluid
constant.
If the temperature is constant for most of the
process but changes during a small amount of
time, only collect data around that event. The
software stores only about 1.5 hours of data in
memory.
2. Click Find Temp Comp on the Data Graph
tab.
3. A popup box will appear which will supply
a temperature compensation coefficient,
typically a number such as -0.00008 or
-8e-5.
4. Record this value, or right click and copy.
Swagelok CR-288 Concentration Monitor User’s Manual
5. Click the Sensor Calibration tab.
6. Select the appropriate port for the sensor in
question and click Load Memory.
7. Click on the Fluid Temperature
Compensation Coeff field on the Sensor Info
tab, type the recorded value or right click and
paste, and click OK.
8. Click Save Memory to update the sensor
memory.
Fig. 23 Entering the Temperature Compensation Coefficient
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Swagelok CR-288 Concentration Monitor User’s Manual
4.1.5 Data Logging
This function allows the user to store data in a
separate file from 288-connect on the computer
hard drive that can then be manipulated. The
main data acquisition method can be accessed by
using the Data Logging tab.
1. Click on the Data Logging tab to display the
Data Logging setup information.
2. Put the file location and name into the Where
box. An extension of *.csv will be added to the
file name automatically.
Note: Do not use the same file location for
multiple sessions of 288-connect that are
open concurrently.
3. In the What box, select the ports from which
you wish to log data and the data types.
Basic Data will log only Fluid Temperature and
Concentration.
Note: It is not necessary to include the date in
the file name as a date string will be part of
the file name automatically.
All Data will log all six data types:
Concentration, [email protected], fluid temperature,
sensor temperature, Pixel Position (raw
algorithm output), and index of refraction (IoR).
4. Click Start Now to begin logging. As the
program logs, it will maintain a count of the
number of logged points on the left-hand side
of the screen; this confirms that the data is
being logged.
Note: When any database program opens a data
file, it makes the file read-only to all other
programs.
The data log automatically rolls over to a new file
with a different timestamp and the same name
originally specified every 10 000 data points. This
prevents a data file from becoming too large, and
makes manipulation of the data in a spreadsheet
easier.
Before opening a data file in a database
program, click Stop Logging. Enter a new
file name in the Where box and click Start
Now. Data logging will continue in the new
file. Open the original file in the database
program.
Fig. 24 Data Logging Screen
Swagelok CR-288 Concentration Monitor User’s Manual
4.2
Advanced Functions
4.2.1 Using the Digital Outputs
The DDU provides two 5 V (dc) digital output
channels, on pins 19 and 20 of the terminal block.
These channels can be used to activate alarms
on an external device if the concentration drops
below a specified constant. There will be no
software indication of an alarm.
The digital outputs can be set for each sensor,
and each sensor can control both channels.
Note: If two sensors have an alarm set for the
same output channel, both alarms are
active on that channel. For example:
●
●
The sensor on Port 1 has been set to
activate the alarm on pin 19 when the
concentration percentage drops below
5 %.
The sensor on Port 2 has been set to
activate the alarm on pin 19 when the
concentration percentage goes above
10 %.
If the alarm on pin 19 is activated, it is known
that either the sensor on Port 1 is below 5 %
or the sensor on Port 2 is above 10 %, but
not which, since the sensor on Port 1 and the
sensor on Port 2 share pin 19.
Fig. 25 Digital Output Setting Selection
19
20
Swagelok CR-288 Concentration Monitor User’s Manual
The software can be used to set alarms for both
pins 19 and 20 for each sensor.
Setting Alarms
1. Click on the Sensor Calibration tab.
2. Select the correct port number for the desired
sensor and click Load Memory.
3. Click the Digital Alarms tab.
4. Alarms can be set for the following items:
●
●
●
Alarm outside concentration range: This
setting will activate an alarm if the reported
concentration goes outside of the range
specified in the Lowest Concentration and
Highest Concentration fields.
Alarm on sensor problem: This setting
will activate an alarm if the sensor has a
problem. A common cause of this is the
sensor being exposed to air. This error
will also cause the DDU processor (DSP)
to display “Sensor In Air?” on the LCD
screen.
Number cycles to delay alarm: This delays
the alarm for the number of consecutive
cycles entered. It can be useful in
compensating for expected process
transients.
Note: A cycle = 1.3 seconds and corresponds to
the frequency a data point is logged.
5. Click Save Memory to update the sensor
memory.
Fig. 26 Digital Output Setting Selection
Swagelok CR-288 Concentration Monitor User’s Manual
21
4.2.2 Chemical Concentration Offset
Chemical concentration offset is a function used
to offset the concentration reading from the
calculated concentration.
It can be used to compensate for variances due to
chemical process changes or chemical lot-to-lot or
supplier variations.
When this function is used, the software will follow
a linear relationship between index of refraction
([email protected]) and concentration for the chemical
being monitored based on the entered offset. If
the relationship entered in chemical calibration is
not linear and still needs to be used, follow the
Re-Zero procedure instead.
Note: The chemical calibration table entered and
saved to sensor memory is not overwritten
in memory by this function.
Using Chemical Concentration Offset
1. Click on the Sensor Calibration tab.
2. Select the port number for the desired sensor
and click Load Memory.
3. Click on the Chemical Calibration tab.
4. Enter the actual concentration of the chemical
in the present fluid stream in the Titrated
Concentration Now box to the left.
5. Click Update. A new value will appear in
the box on the right. This value represents
the amount that will be subtracted from the
concentration before displaying it or outputting
it to the analog outputs or software.
6. Click Save Memory to update the sensor
memory and make the chemical concentration
offset permanent.
7. Observe the Data Graph to verify that the
concentration is now the same as the value
entered.
Fig. 27 Titration Adjust Screen
22
Swagelok CR-288 Concentration Monitor User’s Manual
4.2.3 Rolling Averages
Rolling averages are used to increase the amount
of averaging that the DSP performs on the data.
This increases the response time of the DDU.
Rolling averages can be applied to the following
data to be observed on the DataGraph tab:
●
Concentration
●
Temperature
●
[email protected]
●
PixelPos
Rolling averages cannot be applied to the IoR.
Using Rolling Averages
1. Click on the Sensor Calibration tab.
2. Select the correct port number for the desired
sensor and click Load Memory. (The program
will automatically show the Edit Info tab.)
Note: Under stable conditions, the IoR can
be compared to the [email protected] to observe
the delay added to the other signals by
the averaging, as well as the resulting
smoothing effect of the averaging.
4. Click on the Rolling Averages field.
5. Enter a number 0<=n<=100. This number
specifies the number of points to maintain
in the rolling average. A point requires
approximately 1.3 seconds, therefore 46 points
add approximately one minute to the response
time.
6. Click Save Memory to update the sensor
memory and make the change permanent.
Fig. 28 Rolling Averages
Swagelok CR-288 Concentration Monitor User’s Manual
23
5.0 Maintenance
5.1
Re-Zero
The Re-Zero function is used to compensate
for differences between sensors and operating
environments (ambient temperatures, ambient
light, etc.) and to compensate for slow drift in the
signal experienced over time.
Re-Zero should be done on a sensor every six
months at a minimum to correct for any drift or
when changing sensors.
1. Click on the Sensor Calibration tab.
2. Select the correct port number for the desired
sensor and click Load Memory.
3. Ensure that the sensor is exposed to DIW
(deionized water) at a stable temperature
( 2˚C).
4. Click on the Data Graph tab, then the [email protected]
tab, to ensure that the slope of the [email protected]
value remains 2e-5 or lower over a two minute
period of time. If the slope is greater than 2e-5,
check for any temperature or concentration
variations in the system. Stabilize any
variations.
Note: Follow the Chemical Concentration Offset
procedure if it is not possible to run DIW
through the sensor.
5. Click on the Factory Calibration tab.
6. Click ZeroNow. A new number will appear in
the box.
7. Click Save Memory.
8. Return to the Data Graph tab. The [email protected]
should now be 1.33300 +/- 0.00001.
Note: If the Chemical Concentration Offset
function has been used prior to using
the Re-Zero function, the chemical
concenration offset value should be reset
to zero.
Fig. 29 Re-Zero Screen
24
5.2
Swagelok CR-288 Concentration Monitor User’s Manual
Window Cleaning
Some fluids may develop a film that adheres to
the sensor’s optical window over time. This may
cause poor sensor performance. The sensor may
be disassembled for optical window cleaning if the
Re-Zero procedure does not correct the issue.

WARNING
Before servicing any installed sensor
you must:
● depressurize the system
● flush system.
Residual material may be left in the
sensor and the system.
Hole
plugs
Socket head
cap screws
Washers
Sensor
1. Disconnect the sensor cable and remove the
sensor from the system.
Gasket
2. Remove the hole plugs, socket head cap
screws, and washers. Separate the sensor
from the body.
Body
3. Carefully clean the optical window with an
appropriate solvent and clean cloth.
4. Place the mounting plate against the bottom
of the body. Install the gasket back into the
top of the body.
Mounting
plate
Fig. 30 Disassembled Sensor
4. Assemble the sensor to the body and insert
the washers and socket head cap screws.
5. Torque the socket head cap screws to 20
to 25 in.∙ozf (0.14 to 0.17 N∙m) using a cross
pattern.
6. Torque the cap screws a second time, to 45
to 48 in.∙ozf (0.31 to 0.34 N∙m), using a cross
pattern.
7. Insert the hole plugs.
8. Reinstall the sensor into the system and
reconnect the sensor cable.
Optical
window
9. Pressurize the system and inspect for leaks.
10. Follow the Re-Zero procedure.
Fig. 31 Underview of Sensor
Swagelok CR-288 Concentration Monitor User’s Manual
6.0 Monitor Operation: Stand-Alone DDU
Remote Monitoring of Chemical
Concentration
The DDU features analog output channels that
may be used to remotely monitor chemical
concentration without a computer workstation.
The analog output signals can be acquired by a
local data acquisition system.
6.1
Note: Initial setup and calibration of the sensor
requires the installation and use of the
system software.
Initial Set-Up
1. Install 288-connect on a computer workstation.
Refer to Software Installation.
2. Connect the serial port located on the top of
the DDU to the workstation using a serial cable
of sufficient length.
3. Enter the Lowest and Highest Concentration
and the Lowest and Highest Temperature
values. Refer to Editing a Sensor.
4. Click Save Memory to update the sensor
memory and make the change permanent.
5. Close the program and remove the DDU
connection to the computer workstation.
6.2
Using the Analog Outputs to Collect
Data
1. Remove power from the DDU.
1
24 V+ Supply
2
Power GND
3
Source
4
GND
5
Source
6
GND
7
Source
8
GND
9
Source
10
GND
11
Source
12
GND
13
Source
14
GND
15
Source
16
GND
17
Source
18
GND
Digital Alarm 1
19
NC
Digital Alarm 2
20
NC
Sensor 1 Concentration
2. Remove the terminal block from the DDU.
Sensor 1 Temperature
3. Connect wire leads to appropriate terminals.
Sensor 2 Concentration
Sensor 2 Temperature
Sensor 3 Concentration
Sensor 3 Temperature
56
12
9 10
13 14
17 18
Sensor 4 Concentration
Sensor 4 Temperature
34
78
11 12
15 16
19 20
Fig. 32 DDU Terminal Block and Pin Assignments
25
26
Swagelok CR-288 Concentration Monitor User’s Manual
4. Plug the terminal block back into the DDU.
5. Instruct the local data acquisition system to
acquire 4 mA to 20 mA current signals, once
properly wired. Table 1 describes the output
signals.
6. Use the following equation in order to translate
current signals into concentration and
temperature.
Concentration(%) = (mA – 4) / 16 * (C20ma – C4ma) + C4ma
Temperature(˚C) = (mA – 4) / 16 * (T20ma – T4ma) + T4ma
where:
C4ma = AO Range: Lowest Concentration (%) = 4 mA
C20ma = AO Range: Highest Concentration (%) = 20 mA
T4ma = AO Range: Lowest Temperature (degC) = 4 mA
T20ma = AO Range: Highest Temperature )degC) = 20 mA
Description
Factory Default
Concentration corresponding to 4 mA
–1.00 %
Concentration corresponding to 20 mA
30.00 %
Temperature corresponding to 4 mA
10 degC (50 degF)
Temperature corresponding to 20 mA
65 degC (149 degF)
Table 1 Signal Description
If the sensor has never been used or changed,
the values will be at the factory defaults
defined in Table 1.
Swagelok CR-288 Concentration Monitor User’s Manual
27
7.0 Troubleshooting
Symptom
LCD displays “no
sensor present”
LCD displays
“Sensor In Air” when
chemical is flowing
Excessive Noise
(signal drifts more
than 0.04 % in stable
chemical)
Probable Cause
Remedy
Loose cable / Bad
cable / Sensor not
connected
Detach and reattach both ends.
Replace or swap cable.
Bubble trapped in
flow cell
Turn the sensor upside down (so that cable
points downward) to release the bubbles.
Mounting in this position may prevent future
occurrences.
Dirt or other optical
window fouling has
obscured signal
Inspect the TIR curve on the Diagnostics tab for
a non-linear curve in a 'mountain' pattern. Clean
window with a DIW flush and Re-Zero.
Cable issue / Sensor
malfunction
Inspect the TIR curve on the Diagnostics tab.
If it’s non-linear or not appearing, swap cables.
If there is still a problem, sensor should be
replaced.
Optical window fouling
Clean window with a DIW flush and Re-Zero.
LED brightness issues
Check RawData tab within the Diagnostics tab
for the Brightness (should be ~=1.000) and Light
(should be stable value between 50/512 and
200/512).
If either value is outside range, clean window
with a DIW flush and Re-Zero.
Bad calibration
Verify chemical calibration is representative of
the current chemical. If necessary, recalibrate
the sensor per Constructing a Chemical
Calibration Table.
Large, Rapid
Concentration or
Index of Refraction
Changes
Ambient light changes
Protect sensors from significant external
changes in light. Re-Zero the sensor when clean
for any permanent changes in light conditions.
Small, Rapid
Concentration or
Index of Refraction
Changes
Changing sensor
location to different
port
Follow Re-Zero procedure or maintain original
ports location(s).
Serial cable
disconnected
Ensure that the serial cable is properly
connected to the computer and to the DDU.
Power not connected
Unplug the DDU for five seconds, then
reconnect power.
Software
Restart 288-connect.
USB to serial converter
error
Reload converter driver. Restart 288-connect
and DDU.
Software can’t get
“Opened, Talking”
status
28
Swagelok CR-288 Concentration Monitor User’s Manual
Symptom
Probable Cause
Remedy
Loose cable
Ensure proper cable connections.
Insufficient
administrator rights on
computer
Restart 288-connect.
Use a different serial port on computer or use
serial to USB converter.
Software error
Unplug the DDU for 5 seconds then reconnect.
Restart 288-connect.
Improper temperature
compensation
Change the temperature compensation
coefficient according to Data Graphing.
Variable heating and
cooling temperature
rates
Expose sensor to similar heating and cooling
rates. Adjust Temperature Compensation
Coefficient as needed.
Rapid temperature
change
Dampen heating and cooling rates above
5˚C / min.
Concentrations are
incorrect by a small
constant offset
Sensor needs
to be re-zeroed
Run DIW through the sensor. Re-Zero sensor
according to Re-Zero.
Concentrations
scale incorrectly
(fine at low
concentrations
but increasingly
incorrect at
higher ones)
Chemical calibration
is incorrect
Select the correct chemical according to
Calibration of the Sensor. For custom
chemicals, rebuild the chemical calibration table.
Power LED does
not come on when
device appears
properly powered
Voltage across the
power terminals is not
24 V (dc)
Check voltage. Follow Basic Installation
Procedure for Powering the DDU.
Red LED comes on
Error signal from
sensor
Contact your authorized Swagelok
representative.
Old sensor
information
displayed on Data
Graph tab
Sensor and DDU not
synchronized
Click Update Info on Data Graph tab.
“No E-box found”
displayed when click
on Auto Open
Red error box on
screen
Concentration
reading changes
incorrectly when
temperature
changes
For technical support or further assistance, please contact your authorized Swagelok representative.
Swagelok CR-288 Concentration Monitor User’s Manual
29
8.0 Glossary
288-connect — Software providing Windows-based user interface.
AO, Analog Output — A 4 to 20 mA output signal tuned to the sensor concentration and temperature
readings.
Concentration (%) — Ratio of fluid component A to component B.
Digital Display Unit (DDU) — Control box that receives sensor inputs, processes the information, and
displays it on a LCD screen.
First Derivative — Algorithm used to calculate pixel position from TIR data.
Fluid Temperature Compensation Coefficient (TCC) — Ratio of index of refraction to degrees C.
Index of Refraction (IoR) — A measure of the speed of light in a vacuum divided by the speed of light
in a system fluid at a specific temperature.
Index of Refraction at 20˚C ([email protected]) — A measurement of a system fluid’s index of refraction
after it has been temperature compensated to a standard
temperature of 20˚C.
Line Quality — Measure of the clarity of the optical path in the sensor.
Photodiode Array — An optical device used to detect and measure light.
Pixel — A subcomponent of a photodiode array. Pixels are arranged in a linear matrix to determine
precise location of light.
Raw Data — Plot of LED light intensity relative to pixel position.
Rolling Average — Continuous averaging algorithm for data smoothing.
Total Internal Reflectance (TIR) — A sensor’s reflected light as measured by the photo diode array.
Titration — A laboratory technique by which the concentration of an unknown chemical can be
determined.
Thermistor — A resistive circuit component whose resistance decreases as the temperature increases.
30
Swagelok CR-288 Concentration Monitor User’s Manual
9.0 Spare Part Information
Description
Sensor cable
Digital display unit (DDU)
288-connect software CD
Power supply
USB converter with driver
User’s manual
Ordering Number
CM-C10
CM-DT-111
CMU-288-S
CMU-DT-PS
MS-ADPT-USB-RS232
MS-13-210
DDU kit (DDU, CD, power supply,
CMU-DT-111-PKG
USB, manual)
Swagelok CR-288 Concentration Monitor User’s Manual
31
The Swagelok Limited Lifetime Warranty
Swagelok and its authorized distributors herby warrant to the purchaser of their Products that the nonelectrical components shall be free from defects in material and workmanship for the life of the Products.
All electrical components installed in or on the Product are warranted to be free from defects in material
and workmanship for twelve months from the date of purchase.
The purchaser's remedies shall be limited to replacement and installation of any parts that fail through a
defect in material and workmanship.
All customer-specified components carry the applicable manufacturer's warranty.
ALL OTHER REPRESENTATIONS, EXPRESS OR IMPLIED, WARRANTY, OR LIABILITY RELATING
TO THE CONDITION OR USE OF THE PRODUCT ARE SPECIFICALLY DISAVOWED, AND IN NO
EVENT SHALL SWAGELOK AND ITS AUTHORIZED DISTRIBUTORS BE LIABLE TO PURCHASER,
OR ANY THIRD PARTY, FOR ANY DIRECT OR INDIRECT CONSEQUENTIAL OR INCIDENTAL
DAMAGES.
Swagelok — TM Swagelok Company
CR-288, 288-connect — TM Jetalon Solutions, Inc.
Windows — Microsoft Corp.
© 2006 Swagelok Company
June 2006, R0
MS-13-210
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