Metso 3300 Series User manual

Concentration TCU Manual
Series 3300

2 MANUAL
Manual Series 3300

MANUAL 3
Contents Manual Series 3300
3300 Concentration TCU
User's manual
Contents
1. General information
1.1 Description 4
1.2 Sensors 4
1.3 Temperature compensation 4
1.4 Applications 4
1.5 TCU specications 5
1.6 Warranty 5
1.7 Conformity 5
1.8 Disposal 5
2. Installation
2.1 Dimensions 6
2.2 Installation notes 6
2.3 Mounting the TCU 7
2.4 Electrical connections 8
2.5 Connecting the sensor 10
2.6 Mounting the sensor 11
2.7 Testing the system after installation 14
2.8 Troubleshooting 15
2.9 Maintaining the sensor operation 16
3.Operation
3.1 Keyboard and display 17
3.2 Menu description 18
3.3 Adjusting the TCU 19
Appendix
A Menu 21
B Sensor connection diagram and test probe 23
C The packing system of the sensors 24
D Spare parts 25
E List of related documents 26
915.16 Rev.: 2013-04-08

4 MANUAL
Manual Series 3300 1. GeneRAL InFoRMAtIon
1. General information
1.1 Description
The series 3300 Concentration TCU is designed for con-
centration measurement based on electrical conductivity
and temperature using Metso 4-electrode conductivity
sensors series 4300. It is designed for wall mounting or
panel mounting in industrial plant environments.
The TCU has four set-up modes, three for concentration
and one for conductivities. Each of the four set-up modes
has access to individual setting of temperature compen-
sation, output range, alarm, and calibration. The set-up
modes are selectable remotely or from the keypad.
The TCU has two 4-20 mA current outputs, a display, and
a keypad. The line-powered version has two relays for
alarms.
Optionally the HART© protocol for eld device trans-
mitters can be implemented. For the full specications,
please refer to 915.19 HART Field Device Specication for
series 3000.
HART© communication: Add “H” to the type number.
1.2 Sensors
Sensors are based on the 4-electrode principle according
to which the current and the voltage are measured across
separate electrodes. That eliminates the errors from the
polarization eect that is generally a problem at high
conductivities.
The value of the cell constant is stored in the sensor. This
makes all sensors interchangeable without sacricing
accuracy and without the need for recalibration or re-
entering the cell-constant when exchanging the sensor.
A large selection of sensor types is available meeting the
needs for almost any application.
1.3 Temperature compensation
In an electrolyte, all ions present will contribute to the
conductivity. Dierent ions will contribute with dierent
amounts and the amounts will vary with temperature.
When the conductivity is used for the calculation of a
chemical concentration, it is necessary to calculate what
the conductivity would be at a xed temperature (the
conductivity is temperature compensated). This con-
ductivity is calculated from measured conductivity and
temperature. As dierent ions have dierent temperature
dependences, the temperature compensation is to be
selected to t the actual application. The temperature is
measured with a Pt-1000 resistor in the sensor.
1.4 Applications
The type 3300 Concentration TCU is designed for applica-
tions in the chemical industry, mainly strong acids, but
bases and salts are also covered.
The values to do the signal conditioning for each applica-
tion are stored under a recipe No. The values control the
measuring range, the temperature compensation, the
linearization, the expansion, and the conversion to engi-
neering units.
Concentration recipes
If non-standard recipes are specified they are implemented in Set-up 1
Conductivity temperature compensation
TCU versions type No
Loop-powered Line-powered
Wall mounted 3307 3317
Panel mounted 3308 3318
Set-up 1, 2, and 3
Recipe Application Span Temperature
196.03 HCl 0-15 % 10-80°C
194.59/2 HCl 25-40 % 0-60°C
194.60 HCl 30-36 % 15-45°C
194.56 HF 99.7-100 % 0-50°C
194.56/2 H2O in HF 0-3000 ppm 0-50°C
196.62 HNO3 0-20 % 0-90°C
194.51/3 HNO3 50-75 % 0-65°C
194.70 P2O5 45-60 % 20-80°C
196.42 H2SO4 0-10 % 0-100°C
196.43/3 H2SO4 0-20 % 15-80°C
194.31 H2SO4 50-80 % 25-60°C
194.28 H2SO4 72-82 % 20-70°C
194.10 H2SO4 92-100 % 20-70°C
194.06 H2SO4 93-100 % 20-110°C
196.59 H2SO4 0-230 g/l 0-50°C
194.25 SO3 (Oleum) 18-34 % 20-80°C
194.26 SO3 (Oleum) 55-70 % 25-80°C
196.58 NaOH 0-10 % 0-100°C
194.61 NaOH 20-40 % 20-50°C
194.62 NaOH 45-55 % 40-75°C
196.56 NaCl 0-10 % -5+100°C
196.60 SO2 0-25 g/l 0-50°C
Set-up 4
Reference temperature 25°C
OFF
STD Salt 0 - 200°C
IEC 746 BII 0 - 150°C
NaOH 1% 0 - 150°C
HNO3 1% 0 - 150°C
H2SO4 1% 0 - 150°C
H3PO4 1% 0 - 150°C

MANUAL 5
1. GeneRAL InFoRMAtIon Manual Series 3300
1.5 TCU specications
Conductivity range: 0 nS/cm-2 S/cm (0 µS/m-200S/m)
at reduced accuracy up to 100 S/
cm (10000S/m)
Accuracy, typical (cc=0,2):±0.5%
40nS/cm – 200mS/cm
±2.5% 40nS/cm – 2S/cm
Electrode system: 2 or 4 electrodes
Cell Constant range: Automatic 0.01 to 5
Manual 0.0001 to 99999
Temperature sensor: Pt1000, 4-wire interface
Temperature range: -40°C to +250°C
Sampling rate: 1 sample per sec in normal mode
3 sample per sec. in fast mode
Display: Graphic LCD with backlight in
line-powered types
Current outputs: Line-powered version
Two galvanically isolated 4-20
mA outputs, sharing the return.
Voltage capacity: 16V@20mA
Voltage to ground max. ±85V
Resolution 16 bit
Linearity: ± 0.02%
Endpoints: ± 0.2%
Loop-powered version
Two galvanically isolated 4-20
mA passive outputs, one of
which is the power supply for the
instrument.
Voltage 16-30 V on mA1.
Voltage 6-30V on mA2.
Remaining specications as for
the line-powered version.
Control inputs: Two galvanically isolated inputs
sharing a common return.
Input voltage: +12 to 30V DC
referred to common.
Voltage to ground max. ± 85V
Alarm: Line-powered version
Two relays: One NO contact each.
Contact rating 250VAC 6A, make
current 15A,
Max. breaking capacity 1500VA
Max. break Voltage 400VAC
Dielectric strength coil-contact
4000V, contact-contact 1000V
Enclosure: IP65 when front cover open
IP67 when front cover closed
Temperature ranges: Operation -10 to +60°C
Storage –20 to +70°C
Power supply: Line-powered version
85-265Vac, 50-60Hz, 5VA
Loop-powered version
16-30V on mA1
Housing: Cast aluminium, painted.
1.6 Warranty
We warrant that each new instrument delivered by us is
free from defects in material and workmanship and that
properly used it will perform in full accordance with the
applicable specications.
Any instrument that within its warranty period is found
not to meet those specications after examination by
or in the presence of the supplier will be repaired or re-
placed free of charge except for shipping costs.
The warranty period for electronic parts, TCUs, etc. is two
years from delivery - for mechanical parts, sensors, and
accessories one year from delivery.
1.7 Conformity
1.8 Disposal
After ended lifetime, this equipment should
be scrapped in an environmentally sound
manner.
The equipment contains no batteries.
Declaration of conformity
We, Metso Denmark A/S hereby declare on our sole respon-
sibility that the:
Conductivity TCU type 3300 with corresponding sensors is in
conformity with the following standards:
Emission:
Product family standard industry EN 61000-6-4:2007
EN 61000-3-2:2006 including A1:2009 and A2:2009 or
EN 61000-3-12:2005; Harmonic current
EN 61000-3-3:2008 or EN 61000-3-11:2000; Flicker
Immunity:
Product family standard industry EN 61000-6-2:2005
Exi:
In respect to the EC directive 94/9/EC Annex II,2.3.1 for equip-
ment in categori 3:
- The TCU has no ignition sources in normal operation.
-During normal operaton the increase of surface temperature
from ambient will be below 5°C for line-powered TCUs and
below 2°C for loop-powered TCUs.
Place, date Signature
Lyngby, 2012-08-07
Metso Denmark A/S
The equipment is constructed for permanent
installation and must be grounded for safety
reasons. A power switch must be available
close to the equipment.

6 MANUAL
Manual Series 3300 2. InstALLAtIon
2.2 Installation notes
When planning the installation of the series 3000 conductivity TCU, a number of issues have to be considered;
• Whether mounted on a wall, in a panel or onto a piping
or cable tray, the place should be free of vibrations and
mechanically shocks should not occur.
• Protect the instrument from process electrolyte, and
from downpour. If necessary use a Protection Shield.
• Protect the instrument from excessively high or low
temperatures and from direct sunlight.
• Be aware of the sensors requirements for liquor volume
around the sensor tip.
• Mount the sensor at a place where it is protected from
mechanical impact, where it can be accessed and
extracted from the process liquor for service jobs, and
where the process liquor is properly grounded via the
process piping.
• Avoid long sensor cables if possible.
• Protect the sensor cable from mechanical impact, exces-
sive high or low temperatures and process electrolyte.
• Look up for ground loop currents, which can cause a
uctuating or faulty reading. There should be no po-
tential between the mounting place of the TCU case
and the sensor. If mounting the TCU on a cable tray,
the cable tree should be electrically connected to the
process piping. Also, look up for a potential dierence
between the protective ground and the process piping
and/or the mounting place of the TCU.
• A special situation arises where the process piping is
made by isolating material e.g. PTFE lined steel- piping,
PVC or PP piping, giving no ground-connection of the
process electrolyte. If the sensor is of the type where no
metal structure is in electrical contact with the process
electrolyte giving a grounding of the process electro-
lyte that way, it is necessary to establish a grounding
electrode in the process electrolyte, which must be
connected to the metal structure of the sensor or to the
housing of the TCU.
Dimensions in millimetres
2. Installation
2.1 Dimensions

MANUAL 7
2. InstALLAtIon Manual Series 3300
2.3 Mounting the TCU
Wall mounting
To access the sensor connector, open the lid and
dismount the four corner screws
Panel mounting
Panel cut-out: 138*138 mm
(5.34”* 5.34”)
Pipe mounting
The TCU bottom part can be turned 90° for
mounting on a horizontal tube
Pipe mounting kits
Type No. For pipe
dimension
4902a 25-38 mm
4902b 35-52 mm
4902c 50-73 mm
4902d 72-94 mm
4902e 82-114 mm

8 MANUAL
Manual Series 3300 2. InstALLAtIon
2.4 Electrical connections
Loop-powered version

MANUAL 9
2. InstALLAtIon Manual Series 3300
Line-powered version

10 MANUAL
Manual Series 3300 2. InstALLAtIon
2.5 Connecting the sensor

MANUAL 11
2. InstALLAtIon Manual Series 3300
If the sensor is mounted in a downstream pipe the
mounting point shall be moved away from locations
where an air funnel may be created (c)(d), otherwise it
may be necessary to insert a ow damper just after the
measuring point (f)(g).
If a continuous TCU is wanted even in case the pipe runs
empty, an installation like (h) can be used. The sensor
is mounted at the under side of the horizontal pipe in a
cone, to let air bubbles pass without disturbing the TCU.
Sensor (i) is used to for concentration control in a loop.
The dosing is injected before the sensor, preferably with
a pump between the dosage and the sensor to provide
for mixing before the TCU. The sensor is mounted on the
pressure side of pump to minimize inuence from air
bubbles.
It is recommended to install valves so that the sensor
can be removed for service without a shutdown of the
process.
2.6 Mounting the sensor
General rules
The sensor should be mounted at a place where there
will be no occurrence of air pockets or bubbles.
The best installation is obtained across a pump (a) or in
an upstream pipe (b) (e).

12 MANUAL
Manual Series 3300 2. InstALLAtIon
Sensor (a) is mounted in a tank where it is intended to
control dosing via a pump. If the agitation in the tank
stops, the control loop is opened, and the dosage control
will fail. Control loop will also fail if the liquor level falls
below the sensor measuring head.
Sensor (b) is mounted in a horizontal pipe. If the ow is
too low or in case of no ow, air bubbles may occur or the
pipe may not be lled. Consequently, the sensor will be
measuring partially in air, giving a faulty reading.
Sensor (c) is installed where bubbles may occur due to lo-
cal boiling caused by the vacuum created by the liquor in
the long downstream pipe.
Sensor (d) is installed in a downstream pipe close to an
open ending. The pipe will never be lled and the sensor
will give a faulty reading.
Sensor (e) is installed in the suction side of a pump where
the pressure is low while the pump is running. Conse-
quently, air bubbles may be formed causing a faulty
reading.
Wrong mounting

MANUAL 13
2. InstALLAtIon Manual Series 3300
Typical mounting of 4338 and 4339 sensors

14 MANUAL
Manual Series 3300 2. InstALLAtIon
2.7 Testing the system after installation
From factory the Metso TCU system has been set up ac-
cording to the specications of the purchase order and
the sensor has been adjusted in the relevant liquid.
The TCU determines the concentration based on conduc-
tivity and temperature. Deviations from accurate labora-
tory analyses of the liquor may occur for various reasons,
like for instance liquor composition and installation.
After installation, it is recommended to do a test by com-
paring TCU readings with laboratory results. We recom-
mend using at least 10 readings taken over several days.
Those readings must cover the concentration range of
the TCU as far as possible.
Example:
The readings shall be plotted in a X-Y diagram to show
how well they correlate, whether the sensitivity is correct,
and whether there is any oset. When evaluating the re-
sults, the standard deviation of the laboratory tests shall
be considered. If the correlation between the laboratory
results and the TCU readings is low, the installation shall
be checked. Especially it shall be considered if air bubbles
occur and if the sensor tip is constantly surrounded by
liquid. It may also be helpful to check the working proce-
dure in the laboratory. If the correlation is satisfying but
there is a slope error and/or an oset error, the calibration
line can be changed.
See section 3.3 “Adjusting the TCU”.
G.O.S. 19661 20 - 40 % NaOH
Date Time TCU Laboratory value
021004 09:15 24.0 26.3
021004 12:00 25.1 26.9
021004 14:30 27.7 28.9
021005 09:30 34.1 34.7
021005 11:00 30.9 32.1
021005 13:30 29.0 30.0
021005 15:30 29.2 31.0
021006 09:00 24.0 29.5 disregarded
021006 11:30 32.3 33.6
021006 14:00 31.5 32.5

MANUAL 15
2. InstALLAtIon Manual Series 3300
2.8 Troubleshooting
• Locate the problem to the TCU, the sensor, sensor instal-
lation or to the electrical connections.
If possible shift to another sensor or use a test probe to
check the TCU.
• Temperature reading very wrong:
Check Pt1000 in sensor for short circuit or interruption
The check can be done by resistance measurement from
the sensor connector.
• Temperature reading partly wrong:
This error may arise from a poor thermal contact of the
Pt1000 element to the sensor structure.
The thermal contact can be checked by measuring the
response time for a temperature change.
Another source of error may be the installation. The steel
part of the sensor with the reduced diameter is to be
fully inserted in the process liquor ow.
• Conductivity/process value far out of range:
Check the sensor cable for damage and check the sen-
sor cable connection in the TCU for broken wires.
• Is the sensor tip surrounded with process liquor
• Check the measuring section of the sensor for scaling
deposits and for electrode damages.
• No reading in display:
Check line voltage, fuses and check that the connectors
are in place.
• Setting of the temperature compensation
• Setting of analog output and accordance to setting of
analog input of DCS
• Make a record of set-up info (Appendix A)
If help is required from factory please make a record
of the measurement display and the service display.
This can be done with photos. Use backlight if
possible or illuminate the display from up or down in
a 45° angle to avoid reexes. Do not use ash.

16 MANUAL
Manual Series 3300 2. InstALLAtIon
2.9 Maintaining the sensor operation
Cleaning the sensor
Cleaning may be necessary if deposits have built up to an
extent that aects the cell constant of the electrode part.
When cleaning the sensor do not use hard material to
scrape or grind. Use a soft brush or cloth and a suitable
cleaning remedy depending on the nature of the depos-
its. Be carefull not to damage the electrodes as this might
aect the accuracy of the sensor.
Chemical cleaning can be applied by using any reagent,
that will not aect the sensor material. Sulphamic acid
(NH2SO3H) is recommended. Use 250 g in 1 litre of water.
Heat the water to ease dissolving. The solution can be
used cold or warm.
List of usable cleaning acids for sensors.
Insert for max. 2h at 30°C~ 86°F
Acetic acid CH3 COOH
Citric acid C3H4 (OH) (COOH)3
Formic acid HCOOH
Lactic acid C3H4 (OH) COOH
Nitric acid HNO3
Oxalic acid (COOH)2 , max. 40% w/w
Phosphoric acid H3PO4
Sulphamic acid NH2SO3H
Sulphuric acid H2SO4 , max. 30% w/w
Tartaric acid C2H2 (OH)2 (COOH)2
Warning! Do not use:
Hydrochloric acid HCl
Hydrouoric acid HF
Commercially available cleaning chemicals may contain
corrosion inhibitors, that can create an electrical isolating
layer on the electrodes. This will result in a high scaling
signal after cleaning and a degraded performance of the
sensor.
Removing a sluice sensor
Maximum pressure during withdrawal: 5 bar
1. Unscrew the nut while holding back the sensor to
avoid a violent push-out.
2. Let the sensor move out under control until the stop.
3. Close the ball valve.
4. Unscrew the sensor from the sluice chamber.
Mounting a sluice sensor
1. Check the O-ring for damage before remounting the
sensor.
2. Open the ball valve
3. Insert the sensor and tighten the 1”nut.
Sensor type 4216 4223 4226
Length (mm) 248 228 338

MANUAL 17
3. oPeRAtIon Manual Series 3300
3.Operation
3.1 Keyboard and display
Keyboard:
Measurement display:
Service display:
Menu display:
• OK:
Switch from measurement display to menu display.
Accepting a menu selection, or value.
•esc: Returning from menu or submenu.
• Up and down ▲▼:
In menu: To navigate up and down in the menu.
When entering text or numerical value: Changing value.
• Left and Right◄►:
To navigate in a menu line to a position for modication.
• Metso:
Selects measurement display or service display
•Line 1: Active set-up and Set-up type
• Line 2: Recipe text
• Line 3: Alarm status
• Line 4: Process value
• Line 5: - -
•Line 6: Liquor temperature
• Line 1: TCU serial number and active set-up
• Line 2: Software version
• Line 3: Process value
• Line 4: Measured conductivity, uncompensated
• Line 5: Pt1000 value and liquer temperature.
• Line 6: Cell constant and cell constant mode
• Line 7: Current channel value and range
•Line 8: Voltage channel value and range
• Further menu description in section 3.2 and Appendix A.

18 MANUAL
Manual Series 3300 3. oPeRAtIon
3.2 Menu description
System
Settings in System menu are valid for all set-ups
Set-up select
Selects between Set-up 1, Set-up 2, Set-up 3, Set-up 4
and External.
Each set-up holds an individual set of values and selec-
tions.
Set-up 1, 2 and -3 are assigned to Concentration whereas
set-up 4 are assigned to standard conductivity.
For overview see appendix A.
External set-up selection is controlled from the digital
inputs, (See 2.4 Electrical connection.)
Set-up selection can also be controlled from HART.
Temperature adjust ↑↓
Correct the reading of measured liquor temperature by
pressing <UP> an <DOWN> keys. Adjustment range ±1°C
Contrast adjust ↑↓
Correct the display contrast by pressing <UP> and
<DOWN> keys.
Language
Select TCU language:
English, Swedish, Finnish, Spanish, or Portuguese.
Conductivity unit
Select between S/cm and S/m
Temperature unit
Select between °C and *F
Backlight
Selects between O and On
When set to O backlight it will be on for 20 seconds af-
ter each key pressed and it will be on for 30 seconds after
power-on.
A loop-powered TCU has no backlight.
Run mode
Selects between 1 second update or Fast update.
Controls how often a measurement is made.
In Fast update the TCU samples the sensor as fast as
possible. The sampling rate will be increased from 3 to 4
samples per second when“Manual cell constant” is used.
HART mode
Selects between Read/write, Read only, and O.
HART functionallity is optional and is only implemented
in TCU with type no. ending with letter H.
HART version
Also selects between HART version 6 and HART version 5.
This aects the response from command 0 and 15.
Poll address
Used from HART. Initial set to 0.
Passwords set
Sets the passwords for each submenu in the main menu:
System, Adjustments, Temperature Comp., mA Output
and Alarm. Each password is a 4 digit number.
A password of 0000 give free access. This is factory default.
If the password is forgotten press <LEFT> and <UP> at
the same time. This will clear the password.If password is
used on one or more menu points the System menu shall
also be protected to protect the password.
Adjustment
Settings in adjustment menu are valid only for actual
set-up
Adjust low
Adjust high
Only implemented in Concentration set-up.
See sec. 3,3 for adjustment procedure.
Cell constant mode
Selects between Automatic and Manual mode.
In Automatic mode the cell constant is read from the sen-
sor whereas in Manual mode a xed value is used. When
the mode is changed from Automatic to Manual the au-
tomatic value is transferred to the Manual value.
Manual cell constant can be used to reduce the sampling
period in Fast mode or to make an individual adjustment.
However, the automatic setting of cell constant is lost
when the sensor is exchanged
Cell constant value
Here a manual cell constant value can be entered.
Most sensors have a value between 0.17 and 0.24.
The conductivity reading is proportional with the cell
constant value .
Application
Only implemented in Concentration set-up.
Settings in Application menu are valid only for actual
set-up
Recipe
Select here between available recipes. see section 1.4.1
Unit1
Unit2
The text for the two text strings following the big PV
value can be changed.
Recipe text
The text in line 2 can be changed. The character set is:
Ááäçéêíñóô►◊µΩæÆøØåÅäÄöÖ !”#$%&´()*+,-./
0123456789:<=>?@ABCDEFGHIJKLMNOPQRSTU
VWXYZ[\]^_▲abcdefghijklmnopqrstuvwxyz◄¦►▼⌂
Restore setup
The actual setup is restored to factory defaults.
Temperature Compensation
Only implemented in Conductivity set-up.
Settings in Temperature Comp. menu are valid only for
actual set-up
Select the temperature compensation. See section 1.4.2.
Additionally it is possible to restore all values for actual
setup to factory defaults.
mA output
Settings in mA output menu are valid only for actual set-up

MANUAL 19
3. oPeRAtIon Manual Series 3300
Output select
• O
• Process value
• PV 0-x-∞ Only in conductivity menu
• Conductivity without temperature compensation
• Temperature
• Scaling
Low limit
High limit
Set the values for the selected variable for 4 mA and 20
mA output
For selection O the high limit sets a xed output current
with 0 as 4 mA and 100 as 20 mA. Low limit is not used.
PV 0-X-∞ compresses the output current according to the
formula:
Output current (mA) = χ / (χ + High limit) x 16 + 4
where χ is the process value PV. Low limit is not used.
Alarm
Not implemented in loop-powered version
Settings in Alarm menu are valid only for actual set-up
Alarm select
• O
• Process value
• Conductivity without temperature compensation
• Temperature
Alarm type
• Maximum NO
• Maximum NC
• Minimum NO
• Minimum NC
NO: Relay contact open during non-alarm, closed during
alarm
NC: Relay contact open during alarm, closed during not
alarm
Relay coil is powered when contact closed.
Hystrese: 1% of value, 0.5° for temperature
Alarm limit
Alarm display ash
Valid for all set-up modes with line-powered TCU
Selects between O and On
If set to On an alarm condition will make the backlight
ash.
Autoclean
Not implemented in loop-powered versions
Settings in Autoclean menu are valid for all set-up modes.
The Autoclean function controls the wash sequence of
Autoclean Sensor type 4397. Alarm relay is used for acti-
vating ushing. The normal setting of Alarm 1 is ignored.
mA output 1 is frozen during the ush and hold time.
3.3 Adjusting the TCU
Adjusting for concentration
Calibration is the procedure of entering new endpoints
for the low and high end of the basic TCU range. This is
done from the menu points Adjust lo and Adjust hi. If no
calibration has ever been done since the application was
selected, the Adjust lo will have a value equal to the low
endpoint, and the Adjust hi a value equal to the high end-
point, of the basic TCU range. Selecting an application,
or reselecting the actual application, will overwrite any
adjustments with the default values.
To perform an adjustment, proceed as follows:
• Grab samples from the process stream and read simulta-
neous display readings of the TCU
• Analyze the sample in the laboratory to get chemical
values.
• Read the actual value of Adjust lo and Adjust hi.
• Plot the Laboratory values (y) versus the TCU readings (x).
• Calculate the linear regression line.
• Calculate (or read from the graph) the estimated labora-
tory values corresponding to the actual value of Adjust lo
and of Adjust hi.
• Go to the menu point Adjust lo and Adjust hi and enter
the estimated values.
Spreadsheet 91511.xls helpful to do the calculations.
Example
Application 194.61 (20-40 % NaOH)
Since no adjustment has previously been done, actual
value of Adjust lo was found to be 20, and actual value
of Adjust hi was found to be 40
Assume the following data are collected:
The linear regression gives the equation:
y = 0.88492 * 4.87653
By entering 20 resp. 40 for x in the formula, the following
low-end and high-end values are obtained:
Adjusting lo (x=20) 22.575
Adjusting hi (x=40) 40.273
TCU reading (x) Lab. values (y)
24.0 g/l 26.3 g/l
27.7 g/l 28.9 g/l
30.9 g/l 32.1 g/l
29.2 g/l 31.0 g/l
32.3 g/l 33.6 g/l

20 MANUAL
Manual Series 3300 3. oPeRAtIon
Adjusting for STD conductivity
When the TCU is set up for STD conductivity it can be
adjusted by using Cell Constant in manual mode. The
conductivity reading will be proportional with the Cell
Constant value. The factory cell constant will be restored
when Cell constant mode is set to automatic.