EUTECH INSTRUMENTS ALPHA TDS 200 TOTAL DISSOLVED SOLIDS... User manual

Instruction Manual
α lpha TDS 200
1/8 DIN Total Dissolved Solids Controller with
Temperature display and Transmitter
68X276105 rev 0
08/2002
Techn o lo
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PREFACE
This manual serves to explain the use of the αlpha TDS 200
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 200 controller/transmitter as possible. If there are doubts in the use of the
αlpha TDS 200 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 subjected to change without notice
as improvements are made, and does not represent a commitment on the part
of Eutech Instruments Pte Ltd.
Copyright
©
Aug 2002 Eutech Instruments Pte Ltd. All rights reserved.

TABLE OF CONTENTS
1 INTRODUCTION 5
2 SAFETY INFORMATION 6
3 OVERVIEW 7
3.1 F RONT P ANEL 7
3.2 B ACK P ANEL 8
3.3 W IRING 9
3.4 P ANEL - MOUNTING THE CONTROLLER 10
4 MEASUREMENT MODE 11
5 PASSWORD 12
6 TDS CALIBRATION 14
7 TEMPERATURE CALIBRATION 17
8 SETUP MODE 18
8.1 G ENERAL I NFORMATION 18
8.2 S ETUP MODE OVERVIEW 19
8.3 S ET P OINT 1 – P1.0 21
8.4 S ET P OINT 2 – P2.0 24
8.5 M EASUREMENT R ANGE S ELECTION – P3.0 26
8.6 C ONFIGURE T EMPERATURE S ETTINGS – P4.0 27
8.7 V IEWING TDS C ALIBRATION D ATA – P5.0 28
8.8 V IEWING TDS / T EMPERATURE E LECTRODE D ATA – P6.0 29
8.9 S ET TDS F ACTOR – P7.0 30
8.10 C ONTROLLER R ESET – P8.0 30
9 RELAYS 32
10 TRANSMITTER FUNCTION 32
11 SPECIFICATIONS 33
12 ACCESSORIES 34
13 GENERAL INFORMATION 37

5
1INTRODUCTION
Thank you for purchasing a ⅛DIN TDS 200 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 manual temperature compensation
• Two-level password protection
• Removable terminal strips for quick and easy connections
• Built-in 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

6
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.

7
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 Displayed when measurement range in parts-per-million
7.
o
C Unit of the displayed parameter (temperature)
8. ppt Displayed when measurement range in parts-per-thousands
Keys
9. MODE
Toggle between TDS and temperature display
10. ENTER
Confirm changes or to enter into further levels of sub-menu
11. ▲( increment) Use during calibration and setup modes to increment values.
Press
▲/▼ keys together to escape to Measurement mode
11. ▼(decrement)
Use during calibration and setup modes to decrease values.
Press
▲/▼ keys together to escape to Measurement mode
12. LED Display 14 segment LED display
8.8.8.8.

8
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 8 7 6 5 4 3 2 1
19 18 1 7 16 15 1 4 13
1. VAC live wire
2. VAC neutral wire
3. VAC protective ground wire
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. TDS positive terminal
17. TDS negative terminal
18. unused
19. unused

9
3.3 Wiring
Caution: Ensure electrical mains is 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 = 3
αlpha TDS 200 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: TDS 200 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 in TDS mode and display OR in temperature mode.

10
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.
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.
SIDE VIEW
TOP VIEW
approx.154.20
approx.
100
Wallp
a
Catch
Threade
d
Catch
Threadedrod

11
4MEASUREMENT MODE
Press MODE to toggle between:
• TDS measurement mode and
• Temperature measurement mode
Total Dissolved Solids 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.
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 display shows ATC
(Automatic Temperature Compensation) or MTC (Manual Temperature Compensation),
then the current measured temperature (for ATC) or the set temperature (for MTC). The
o
C annunciator lights when you are measuring temperature.
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.
See Setup program P4.0 for further instructions.

12
5PASSWORD
To access Calibration and Setup functions, you need to enter a password code. You
cannot change calibration and setup parameters unless you first enter the password.
The αlpha TDS 200 controller features two separate passwords:
• TDS and Temperature calibration mode password = 011
• Setup program password = 022
To enter the password:
1. Press ENTER twice. The display reads “P.000”. The first “0” flashes.
2. Press ENTER again to leave the first digit “0” and to scroll to the next number.
3. Press the ▲or ▼keys to change the second digit to the correct number (1 or 2).
Press ENTER.
4. Press the ▲or ▼keys to change the second digit to the correct number (1 or 2).
Press ENTER.
If you enter an incorrect digit, press MODE to back up.
5. 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 mode.

13
P
.
P
.000
P.000
P
.010
P.020
P.011
P.022

14
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 200 controller includes 8 total dissolved solids 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 500 ppm, then allowable measured
values by controller must be within 700 ppm {+ 40%} and 300 ppm{- 40%});
and
2. the lowest possible value must be at least 10% of full scale
(e.g. if range of 0 to 1000 ppm is selected, min. measured value at
calibration, must be at least 100.0 ppm).

15
If any or both conditions are not satisfied, controller will display ERR 1 (blinking).
1. Key in the password “011” using the method described in Section 5.
2. Controller flashes the value of the standard solution.
3. Use electrode to agitate standard solution to obtain a homogeneous solution and
to dislodge any bubbles. Allow electrode time to stabilize with solution temperature.
4. Use ▲/ ▼keys to adjust displayed readings to the value of the standard solution.
Press ENTER.
5. If any of the two conditions mentioned above is not satisfied, controller will display
ERR1, blinking.
6. If calibration is successful, Controller displays DONE, blinking. Press ENTER to
revert to TDS measurement mode (Relays and 4-20 mA output resume activities
as per previous settings).
NOTE: To clear the ERR1 display and return to calibration mode, press ▲/ ▼keys
together.

16
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.

17
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
o
C.
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 50
o
C. Factory default is 25.0
o
C.
See Setup program P4.0 for instructions on ATC or MTC selection.
To offset temperature:
1. Press MODE to select
o
C mode. Display shows MTC or ATC, then temperature.
2. Key in password “011” as per procedure in Section 5.
3. The screen will flash current
o
C reading.
4. For ATC: Determine temperature of solution with an accurate meter (such as the
Temp 5). Press ▲or ▼keys to offset
o
C value on controller display to match value
of the solution you are measuring.
For MTC: Press ▲or ▼keys to offset
o
C value on controller display to match
desired value.
5. Press ENTER. The display flashes “DONE” for about 3 seconds and returns to
temperature measurement mode (Relays and 4-2- mA output resume activities as
per previous settings)

18
22.5
25.0
d
o
n
e
ENTER
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).

19
P
1
.0
P3.0
P
4
.
0
P5.0
P6.0
P2.0 P7.0
P6.
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: Calibration TDS Buffer points
P5.1: view TDS value at which calibration was performed

20
P6.0: Electrode Properties
P6.1: view cell correcting factor 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: select yes/no to reset controller to factory defaults