EUTECH INSTRUMENTS ALPHA TDS 190 18 DIN TOTAL DISSOLVED SOLIDS... User manual

Instruction Manual
αlpha TDS 190
1/8 DIN Total Dissolved Solids Controller
with Temperature display and Transmitter
68X276108
Rev 0 11/2004
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PREFACE
This manual serves to explain the use of the αlpha TDS 190 controller/transmitter.
This manual functions in two ways: first, as a step-by-step guide to help you
operate the meter;second, it serves as a handy reference guide.
This manual is written to cover as many anticipated applications of the αlpha TDS
190 controller/transmitter as possible. If there are doubts in the use of the αlpha
TDS 190 controller / transmitter, do not hesitate to contact the nearest Eutech
Instruments Authorized Distributor.
Eutech Instruments cannot accept any responsibility for damage or malfunction to
the controller/transmitter caused by improper use of the instrument. Remember to
fill in the guarantee card and mail it to your Authorized Distributor or Eutech
Instruments Pte Ltd.
The information presented in this manual is subject to change without notice as
improvements are made, and does not represent a commitment on the part of
Eutech Instruments Pte Ltd.
Copyright©2004
All rights reserved.
Rev. 0 11/2004
Eutech Instruments Pte Ltd.

TABLE OF CONTENTS
1INTRODUCTION 1
2SAFETY INFORMATION 2
3OVERVIEW 3
3.1 FRONT PANEL 3
3.2 BACK PANEL 4
3.3 WIRING 5
3.4 PANEL-MOUNTING THE CONTROLLER 5
3.5 FERRITE ASSEMBLY 6
4MEASUREMENT MODE 7
4.1 MEASUREMENT MODE DISPLAY 7
4.2 SET POINTS ADJUSTMENTS 8
5PASSWORD 9
6TDS CALIBRATION 11
7TEMPERATURE CALIBRATION 13
8SETUP MODE 14
8.1 GENERAL INFORMATION 14
8.2 SETUP MODE OVERVIEW 15
8.3 SET POINT 1–P1.0 16
8.4 SET POINT 2–P2.0 18
8.5 MEASUREMENT RANGE SELECTION –P3.0 20
8.6 CONFIGURE TEMPERATURE SETTINGS –P4.0 21
8.7 VIEWING TDSCALIBRATION DATA –P5.0 22
8.8 VIEWING TDS/TEMPERATURE ELECTRODE DATA –P6.0 23
8.9 SETTING TDSFACTOR –P7.0 24
8.10 CONTROLLER RESET –P8.0 25
9RELAYS 26
10 TRANSMITTER FUNCTION 26
11 SPECIFICATIONS 27
12 ACCESSORIES 28
13 GENERAL INFORMATION 31

1
1INTRODUCTION
Thank you for purchasing the αlpha TDS 190 ⅛DIN TDS Controller. This
controller is part of a series of quality process controllers available from Eutech
Instruments. These sturdy, economical TDS controllers are designed with the
features and reliability of a much more expensive instrument.
Your controller includes:
•Removable terminal blocks for easy connections;
•Two mounting brackets for easy panel mounting;
Some features of this controller are:
•Two set point, two SPDT relay operation
•Scrolling, 14-segment LED guides user easily through setup functions
•Reliable power supply from 85 to 260 V AC, 50/60 Hz or DC withstands
voltage fluctuations
•Push-button operation from the front panel
•Single-point calibration for each individual range
•Adjustable hysteresis band prevents rapid contact switching around set-point
•Selectable automatic or manualtemperature compensation
•Two-level password protection
•Removable terminal strips for quick and easy connections
•Built-in non volatile memory backup retains setup even if power fails,
and lets you configure unit before installation
•Isolated 4-20 mA output for remote monitoring or hard copy recording

2
2SAFETY INFORMATION
The Eutech Controller / Transmitter shall be installed and operated only in the
manner specified in the Instruction manual. Only skilled, trained or authorized
person should carry out installation, setup and operation of the instrument.
Before powering up the unit, make sure that power source it is connected to, is as
specified in the top label. Failure to do so may result in a permanent damage to the
unit.
The unit has live and exposed parts inside. If it has to be opened, make sure that
the power to the unit is off and disconnected.
The unit is Fuse protected. In the event the fuse has to be replaced, use only those
as specified in the manual.
The degree of protection against electric shock will be achieved only by
observance of the corresponding installation rules.

3
3OVERVIEW
3.1 Front Panel
The front panel consists of a 4-digit LED display, 8 LED annunciators and 4 keys.
Annunciators
1. REL 1 Displayed when Relay 1 is activated
2. REL 2 Displayed when Relay 2 is activated
3. MEAS Displayed in measurement mode
4. CAL Displayed in calibration mode
5. SETUP Displayed in setup mode
6. ppm Unit of the displayed parameter (parts per million)
7. oC Unit of the displayed parameter (temperature)
8. ppt Unit of the displayed parameter (parts per thousand)
Keys
9. MODE Use to toggle between Measurement modes
(TDS and temperature).
10. CAL / ENTER Use to enter Calibration mode.
Use also to enter into levels of the Setup mode
and to confirm changes made.
11. SP1 / ▲
SP2 / ▼Use to enter Set Point 1 (SP1) or Set Point 2 (SP2) adjustment mode.
Use as increment or decrement keys during
Calibration and Setup modes.
Use both keys together in Calibration and Setup
modes to escape to Measurement mode.
12.14-segment display
CAL
ENTER
MODE
TDS 190 Series
ppm ppt
SP1
SP2
C

4
3.2 Back Panel
The back panel consists of three different connectors that can be used with
removable terminal blocks (included):
12 11 10 9
1820 1921
8
17
7
16
6
15
35
14
24
13
SENSE
PT100
RELAY2
NC NC N L
-4-20mA
+4-20mA
RELAY1
Caution
IN
GND
+CON
-CON
NC
NC
1
1. VAC live wire
2. VAC neutral wire
3. unused
4. unused
5. Relay 2 deactivated position (normally closed)
6. Relay 2 center pole
7. Relay 2 activated position (normally open)
8. Relay 1 deactivated position (normally closed)
9. Relay 1 center pole
10. Relay 1 activated position (normally open)
11. 4-20 mA connection, negative
12. 4-20 mA connection, positive
13. Pt 100 connection: sense (jumper to terminal 14 if using 2-wire RTD)
14. Pt 100 connection: input
15. Pt 100 connection: ground
16. Conductivity positive terminal
17. Conductivity negative terminal
18. unused
19. unused
20. VAC protective ground wire
21. VAC protective ground wire

5
3.3 Wiring
Caution: Ensure electrical mains are disconnected before proceeding.
1. Connect the power supply to the three-pin terminal block
•VAC live wire = 1
•VAC neutral wire = 2
•VAC protective ground wire = 20 OR 21
αlpha TDS 190 controller accepts voltages from 85 to 260 VAC, 50/60 Hz or DC.
2. Connect the Pt 100 leads to terminals 13 to 15 of the seven-pin terminal block.
Either wire can be connected to either terminal. Terminals 13 and 14 must be
shunted unless using a 3-wire RTD.
NOTE: αlpha TDS 190 is factory set for Automatic temperature compensation.
MTC can be selected in Program P4.0.
3. Power on the controller. The display automatically shows the TDS reading, the
ppm and ‘MEAS’ annunciators’ lights.
NOTE: In the event Pt 100 is not connected or the connection is broken in the ATC
mode, the display flashes ‘OR’ to alert you.
3.4 Panel-mounting the controller
The supplied mounting hardware allows surface mounting to all panels and
protective enclosures.Mounting cut-out size is 91 x 45 mm.
To attach the mounting to the controller:
1. Align the catch to the side of the controller, and insert threaded rods through
catch.
12 11 10 9 8 7 6 5 4 3 2 1
19 18 17 16 15 14 1321 20
2. Screw the threaded-rod through the catch in a clock-wise direction. Tighten
until the catch holds the controller firmly against the back of the panel or
protective housing.Repeat on the other side.

6
SIDE VIEW
approx.100
Wall panel
Catch
Threaded rod
Catch
Threaded rod
TOP VIEW
approx.154.20
3.5 Ferrite Assembly
The power cable (L, N & E) needs to be connected to the instrument with two turns
through the Split Ferrite which is supplied as an accessory with the instrument. It is
strongly suggested that the Ferrite element supplied as a standard accessory be
installed as described below.

7
4MEASUREMENT MODE
The αlpha TDS 190 controller is capable of taking TDS measurement with
Automatic (ATC) or Manual (MTC) Temperature Compensation.
The measurements are displayed distinguishingly by the annunciators on the front
panel.
4.1 Measurement mode display
Press the MODE key to toggle between TDS and Temperature measurement
mode.
Conductivity Measurement Mode
The controller displays the selected TDS range number, R X (X ranges from 1 to
8), for 2 seconds before displaying the TDS measurement. The ppm or ppt
annunciator will light up depending on which range is selected.
TDS Range Range No., R Resolution Cell Constant
0.00 – 10.00 ppm 1 0.01 ppm 0.1
0.0 – 100.0 ppm 2 0.1 ppm 0.1
0.0 – 100.0 ppm 3 0.1 ppm 1
0 – 1000 ppm 4 1 ppm 1
0.00 – 5.00 ppt 5 0.01 ppt 1
0.00 – 10.00 ppt 6 0.01 ppt 1
0.0 – 100.0 ppt 7 0.1 ppt 1
0.0 – 100.0 ppt 8 0.1 ppt 10
Temperature Measurement mode
Press MODE key once to view the temperature measurement. The °C annunciator
lights up. The display shows ATC or MTC, then the current measured temperature.
For selection of temperature compensation ATC or MTC, see Setup program P4.1.
NOTE: After pressing the MODE key to display Temperature, if there is no further
key-press, the Controller will automatically revert to TDS Measurement mode after
about 30 seconds.

8
4.2 Set Points Adjustments
You can make quickset points adjustments with the direct access of the Set Points
adjustment modes (SP1 and/or SP2). By just pressing the SP1/▲or SP2/▼key,
you can enter the Set Point adjustment mode and set a new TDS value that will
cause your controller to activate.
Set Point 1 (SP1) adjustment mode
This lets you adjust the TDS value in Set Point 1. If this value is crossed, the set
point relay 1 LED will light.
1. Press the SP1/▲key. The screen will scroll P1.1, SP1, and then the current
set point value.
2. Press the ▲or ▼keys and adjust first relay set point. Default value is 10%
of full scale of range selected.
3. Press ENTER to confirm and return to the measurement mode.
NOTE: Press ▲and ▼keys together (ESCAPE) at anytime, to return to
Measurement mode.
Set Point 2 (SP2) adjustment mode
This lets you adjust the TDS value in Set Point 2. If this value is crossed, the set
point relay 2 LED will light.
4. Press the SP2/▲key. The screen will scroll P2.1, SP2, and then the current
set point value.
5. Press the ▲or ▼keys and adjust first relay set point. Default value is 90%
of full scale of range selected.
6. Press ENTER to confirm and return to the measurement mode.
NOTE: Press ▲and ▼keys together (ESCAPE) at anytime, to return to
Measurement mode.
NOTE: These modes are only for adjusting relay 1 and/or relay 2 set points values.
To set the relays as low or high set points or to set its hysteresis values, you have
to make the adjustments from the Setup mode as in Section 8.3 and Section 8.4.

9
5PASSWORD
The Setup mode is to be accessed by entering a password code. The direct
accessed Set Point adjustment mode (SP1 and SP2) and the Calibration mode
can also be accessed through this password code procedure.
The αlpha TDS 190 controller features two separate passwords:
•TDS and Temperature calibration mode password = 011
•Setup program password = 022
To enter the password:
1. Press the MODE key, and within 1 second, press the CAL/ENTER key. The
display reads P.WRD.
2. Press ENTER again. The display reads “P.000”. The first “0” flashes.
3. Press ENTER again to leave the first digit “0” and to scroll to the next
number.
4. Press the ▲or ▼keys to change the second digit to the desired password
number (1 or 2). Press ENTER.
5. Press the ▲or ▼keys to change the second digit to the correct password
number (1 or 2). Press ENTER. The display flashes the password that has
been entered.
NOTE: If you enter an incorrect digit, press MODE to step backward.
6. Press ENTER again. You are now in Calibration mode or Setup mode,
depending on password entered.
NOTE: In the Password Entry mode, if there is no key-press for more than 30
seconds, Controller will automatically revert to measurement

10
P
.
P
.
000
P.
000
P
.01 0
P.020
P.0 11
P
.022
P.0 11
P
.022

11
6TDS CALIBRATION
IMPORTANT: When Calibration mode is entered, controller automatically goes into
a “HOLD” mode where the 4-20 mA output freezes and relays are de-activated (if it
was in an activated condition). Upon return to measurement mode, both 4-20mA
output and relay activities resume, depending on settings.
The αlpha TDS 190 controller includes 8 TDS measurement ranges. One-point
slope calibration is possible, in each range.
Choose fresh standard solutions, whose value is reasonably close to the
measurement value.
Before calibration, make sure electrode is clean. Use iso-propyl alcohol followed by
thorough rinsing in distilled water to clean electrode.
Important: To achieve a successful TDS calibration, two conditions must be
satisfied:
1. Difference between measured value of standard solution, and actual
value of standard solution, must be within ± 40 %.
(e.g. if value of standard solution is 1500 ppm, then allowable
measured values by controller must be within 2100ppm {+ 40%} and
900 ppm {- 40%}); and
2. The lowest possible value must be at least 10% of full scale
(e.g. if range of 0 to 100.0 ppm selected, min. measured value at
calibration, must be at least 10.0 ppm).
If any or both conditions are not satisfied, controller will display ERR 1 (blinking).
1. Press CAL / ENTER key to directly access the Calibration mode when the
unit is in conductivity measurement mode. Controller displays the value of
the standard solution.
NOTE: Instead of pressing the CAL/ENTER key, you can also enter the Calibration
mode using the password code procedure as explained in Section 5.
2. Use electrode to agitate standard solution to obtain a homogeneous solution
and to dislodge any bubbles. Allow electrode time to stabilize with solution
temperature.
3. Use ▲/ ▼keys to adjust displayed readings to the value of the standard
solution. Press ENTER.

12
4. If any of the two conditions mentioned above is not satisfied, controller will
display ERR1, blinking.
5. If calibration is successful, Controller displays DONE, blinking. Press
ENTER to revert to TDS measurement mode (Relays and 4-20 mA output
resume previous settings).
NOTE: To clear the ERR1 display and return to calibration mode, press ▲/ ▼
keys together.
509
500
done
ENTER
ENTER
Notes:
You can view the calibrated TDS value from Setup program. See Setup program
P5.0.
Controller displays calibrated TDS point for selected range.
If calibration is not done for the selected range, controller displays ‘- - - -‘.
If after thorough cleaning of electrode and ERR1 is displayed after an attempted
calibration, consider changing electrode.

13
7TEMPERATURE CALIBRATION
IMPORTANT: When Calibration mode is entered, controller automatically goes into
a “HOLD” mode where the 4-20 mA output freezes and relays are de-activated (if it
was in an activated condition). Upon return to measurement mode, both 4-20mA
output and relay activities resume, depending on settings.
This controller features selectable Automatic Temperature Compensation (ATC) or
Manual Temperature Compensation (MTC).
ATC: ATC mode requires a Pt 100 temperature element. ATC automatically
compensates for temperature fluctuations. ATC temperature readings can be offset
by ±10 oC.
Important: If there is no temperature element wired to controller and ATC is
selected on, screen will flash in TDS mode and an error message (OR) is
displayed in temperature mode.
MTC: MTC lets you select a specific value at which temperature will be
compensated. You can select a manual temperature value from 0 to 50oC. Factory
default is 25.0oC.
See Setup program P4.0 for instructions on ATC or MTC selection.
To offset temperature:
1. Press MODE to select oC mode. Display shows MTC or ATC, then
temperature.
2. Press CAL / ENTER key to directly access the offset mode when the unit is
in temperature measurement mode.
NOTE: Instead of pressing the CAL/ENTER key, you can also enter the offset
mode using the password code procedure as explained in Section 5.
3. The screen will flash current oC reading.
4. For ATC: Determine temperature of solution with an
accurate meter (such as the Temp 5). Press ▲or
▼keys to offset oC value on controller display to
match value of the solution you are measuring.
For MTC: Press ▲or ▼keys to offset oC value on
controller display to match desired value.
5. Press ENTER. The display flashes “DONE” for
about 3 seconds and returns to measurement
mode.
2
2
.5
2
5.0
d
o
n
e
ENTER

14
8SETUP MODE
8.1 General Information
IMPORTANT: When Setup mode is entered, controller automatically goes into a
“HOLD” mode where the 4-20 mA output freezes and relays are de-activated (if it
was in an activated condition). Upon return to measurement mode, both 4-20mA
output and relay activities resume, depending on settings.
To enter setup mode:
1. Key in password “022” using method described in section 5.
2. Press ▲or ▼keys to display various sub-menus shown here.
3. When a sub-menu item is displayed, press ENTER key to enter that sub-
menu.
4. Press ▲and ▼keys together (ESCAPE) to leave Setup mode and return to
Measurement mode (Relays and 4-20 mA output resume previous settings).
P
1
.0
P3. 0
P4
.
0P5.0
P6.0
P2.0 P7.0
P6.

15
8.2 Setup mode overview
P1.0: Set Point 1
P1.1: select relay 1 set point value
P1.2: select relay 1 as low or high set point
P1.3: set relay 1 hysteresis value
P2.0: Set Point 2
P2.1: select relay 2 set point value
P2.2: select relay 2 as low or high set point
P2.3: set relay 2 hysteresis value
P3.0: Range
P3.1: select measurement range (with the corresponding cell constant value).
Eight measurement ranges are available.
P4.0: Temperature Data
P4.1: select ATC or MTC
P4.2: select temperature coefficient value
P4.3: select normalization temperature
P5.0: TDS Calibration points
P5.1: view TDS value at which calibration was performed
P6.0 Electrode Properties
P6.1: view cell constant value after calibration
P6.2: view temperature offset value after calibration (only if in ATC mode)
P7.0: TDS Factor
P7.1: select TDS factor for appropriate application
P8.0: Reset
P8.1: selectyes/no to reset controller to factory defaults

16
8.3 Set Point 1 – P1.0
Setup program P1.0 allows you to set parameters for relay 1.
P1.1: select relay 1 set point value
P1.2: select relay 1 as low or high set point
P1.3: set relay 1 hysteresis value (dead band)
P
1
.
0
P1.1 P1. 2 P1.
.
3
SP 1SP 1SP 1
100.0 LOW
HIGH
1
00
HYS
t
Press ▲and ▼keys together (ESCAPE) at anytime, to leave Setup mode and
return to Measurement mode.
P1.1: Select relay set point value
Set the TDS value that will activate Relay 1. If measured value overshoots or
undershoots Set Point value, Relay 1 will be activated and corresponding LED on
front panel will light.
1. Key in password “022” as per procedure in Section 5.
2. Screen will scroll P1.0 and SP1. Press ENTER.
3. Screen will scroll P1.1, SP1, then current set point value.
4. Press ▲or ▼keys and adjust first relay set point. Default value is 10% of
full scale of range selected.
5. Press ENTER to confirm and continue to step three of P1.2, or press ▲and
▼keys together to return to P1.0. Press ▲and ▼keys together again, to
return to the TDS measurement mode.
P1.2: Set relay as high or low set point
Select low set point to activate Relay when measured value undershoots Set point;
select high set point to activate Relay when measured value overshoots Set point.
Using both SP1 and SP2, you can select lo/lo, lo/hi, hi/lo or hi/hi set points.
1. Key in password “022” as per procedure in Section 5.
2. The screen will scroll P1.0 and SP1. Press ENTER twice.
3. The screen will scroll P1.2, SP1, and LOW (or HIGH).
4. Use ▲or ▼keys to toggle between LOW and HIGH.
5. Press ENTER to confirm and continue to step 3 of P1.3, or press ▲and
▼keys together to return to P1.0. Press ▲and ▼keys together again, to
return to TDS measurement mode.

17
P1.3: Set Hysteresis value
Hysteresis prevents rapid contact switching if measured value is fluctuating near
the set point. Once activated, relay will not de-activate until measured value
reaches set point plus hysteresis value.
Example: Low set point is 100.0 ppm and hysteresis 10.0 ppm, relay will activate
when value drops below 100.0 ppm, but will not de-activate till measured TDS
value rises above 110.0 ppm.
Default hysteresis value is 5% of full scale. The hysteresis window can be set to
any value within the range shown below:
TDS Range Range No., R Hysteresis Window
0.00 – 10.00 ppm 1 0.00 – 1.00 ppm
0.0 – 100.0 ppm 2 0.0 – 10.0 ppm
0.0 – 100.0 ppm 3 0.0 – 10.0 ppm
0 – 1000 ppm 4 0 – 100 ppm
0.00 – 5.00 ppt 5 0.00 – 0.50 ppt
0.00 – 10.00 ppt 6 0.00 – 1.00 ppt
0.0 – 100.0 ppt 7 0.0 – 10.0 ppt
0.0 – 100.0 ppt 8 0.0 – 10.0 ppt
1. Key in password “022” as per procedure in Section 5.
2. The screen will scroll P1.0 and SP1. Press ENTER three times.
3. The screen will scroll P1.3, HYS1, and current hysteresis value.
4. Press ▲or ▼keys to adjust hysteresis value (0 to 10% of full scale).
5. Press ENTER to confirm. Press ▲and ▼keys together to return to P1.0.
Press ▲and ▼keys together again, to return to TDS measurement mode.