EUTECH INSTRUMENTS apha-CON500 User manual

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68X216867 Rev 1 May 06
Instruction Manual
αlpha-CON500
2-Wire Conductivity Transmitter
µS/mS/ºC meter

Preface
This manual serves to explain the use of the CON 500 transmitter. It functions in
two ways, firstly as a step by step guide to help you to operate the transmitter.
Secondly, it serves as a handy reference guide. It is written to cover as many
anticipated applications of the transmitter as possible. If there are doubts in the use
of the transmitter, please do not hesitate to contact the nearest Authorized
Distributor.
Eutech Instruments will not accept any responsibility for damage or malfunction to
the transmitter caused by improper use of the instrument.
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.
Copyright © 2004
All rights reserved
Eutech Instruments

TABLE OF CONTENTS
1INTRODUCTION ...................................................................................1
2PREPARATION ....................................................................................2
2.1 POWER SUPPLY REQUIREMENTS (SL2 POSITION)........................................... 3
2.2 CONNECTING THE ELECTRODE AND TEMPERATURE SENSOR (SL1 POSITION).... 3
2.2.1 To connect the Conductivity electrode: ............................................. 3
2.2.2 To connect ATC temperature sensor: ............................................... 4
3INSTALLATION ....................................................................................5
3.1 MECHANICAL DIMENSIONS ............................................................................ 5
3.2 WALL MOUNT.............................................................................................. 5
3.3 PANEL MOUNT ............................................................................................ 6
4DISPLAY AND KEYPAD FUNCTIONS ................................................7
4.1 DISPLAY ..................................................................................................... 7
4.2 KEYPAD ...................................................................................................... 8
5CALIBRATION...................................................................................... 9
5.1 IMPORTANT INFORMATION ON TRANSMITTER CALIBRATION ............................... 9
5.2 TEMPERATURE CALIBRATION ...................................................................... 11
5.3 CONDUCTIVITY CALIBRATION ...................................................................... 12
6ADVANCED SETUP FUNCTIONS .....................................................13
6.1 RANGE AND ZOOMING SELECTION SETTING.................................................. 13
6.2 TEMPERATURE COMPENSATION SETTING ..................................................... 15
6.2.1 Automatic Temperature Compensation .......................................... 15
6.2.2 Manual Temperature Compensation............................................... 16
6.3 HOLD CURRENT SETTING.......................................................................... 18
6.4 OUT-OF-RANGE CURRENT SETTING ............................................................ 18
6.5 TEMPERATURE COEFFICIENT AND NORMALIZATION TEMPERATURE SETTING .... 19
6.5.1 Setting the temperature coefficient ................................................. 19
6.5.2 Setting the normalization temperature ............................................ 19
6.6 CELL CONSTANT SETTING .......................................................................... 20
6.7 LINE RESISTANCE SETTING ......................................................................... 20
6.8 VIEWING CALIBRATION POINT...................................................................... 21
6.9 VIEWING THE ELECTRODE DATA.................................................................. 21
6.10 RESET FUNCTION ...................................................................................... 22
7FACTORY DEFAULT SETTINGS ......................................................23
8TROUBLE SHOOTING GUIDE...........................................................24

9SPECIFICATIONS ..............................................................................25
10 ACCESSORIES...............................................................................26
11 WARRANTY ....................................................................................27
12 RETURN OF ITEMS ........................................................................27

Instruction Manual CON 500
- 1 -
1 INTRODUCTION
Thank you for selecting a CON 500 LCD Transmitter. This isolated output 4-20mA
transmitter is a sturdy microprocessor-based instrument that measures conductivity
and temperature and transmits its output via the 2-wire power supply loop.
This transmitter has many user-friendly features – all of which are completely
accessible through the water-resistant membrane keypad. Your transmitter includes
an instruction manual and a warranty card.
Please read this manual thoroughly before operating your transmitter.
2-wire Conductivity Transmitter
lpha CON500
MEAS
°C
READY
.
A
TC
1413
μ S

Instruction Manual CON 500
- 2 -
2 PREPARATION
Remove screws from the four corners at the back of the Transmitter, and remove
back cover.
Connectors should be exposed as follows:
NC
NC
NC
Figure 1 – Connection Guide
All wiring is done on 2 detachable connectors: –
1. 9-pin connector (located on SL1 position) for Conductivity electrode and
temperature sensor; &
2. 3-pin connector (located on SL2 position) for power supply.
Using a suitable screwdriver, loosen screws from top of connector.
When inserting the wires, always hold connector with top screws facing up.

Instruction Manual CON 500
- 3 -
2.1 Power Supply Requirements (SL2 Position)
The CON 500 transmitter requires a 12 to 24V DC power supply. Other
Transmitters and/or a chart recorder may be connected in the loop.
1. Insert positive loop wire from power supply to pin 1, tighten screw.
2. Insert negative loop wire to pin 2, tighten screw. This wire may be linked to
a chart recorder or to negative terminal of power supply.
2.2 Connecting the Electrode and Temperature Sensor (SL1
Position)
2.2.1 To connect the Conductivity electrode:
The CON 500 transmitter accepts any industrial electrodes for conductivity
measurements and they are usually offered with bare wires.
3.1. Insert the electrode’s conductivity wire Low into pin 3 of SL1 connector.
Tighten the screw.
2. Insert the electrode’s conductivity wire High into pin 4 of SL1 connector.
Tighten the screw.
Conductivity wire High
Conductivity wire Low
Shield wire
Pt 100 Input wire
Pt 100 Sense wire
Pt 100 Return wire
To Electrode
Alpha
CON 500
Power
Supply
Chart
Recorder
1
2

Instruction Manual CON 500
- 4 -
2.2.2 To connect ATC temperature sensor:
For Automatic Temperature Compensated (ATC) Conductivity readings, an in-built
temperature sensor is usually integrated in the industrial conductivity electrodes.
Otherwise, a separate 100ΩPt RTD temperature probe can be used.
3 wire temperature sensor
1. Insert the Pt100 input wire to pin 5 of SL1 connector. Tighten the screw.
2. Insert the Pt100 sense wire to pin 6 of SL1 connector. Tighten the screw.
3. Insert the Pt100 return wire and the shield wire to pin 7 of SL1 connector.
Tighten the screw.
2 wire temperature sensor
1. Take a small length of wire and short pins 5 and 6 of SL1 connector. Insert
Pt 100 sense wire into pin 6 of SL1 connector and tighten the screws.
2. Insert Pt 100 return wire and the shield wire to pin 7 of SL1 connector.
Tighten the screw.
IMPORTANT: It is necessary to connect the SHIELD wire to the pin 7 as stated
above to eliminate possible oscillation of the conductivity and/or temperature
reading due to electrical noise or interference.
Ensure that no bare wires are exposed and all screws are tightened for proper
contact.

Instruction Manual CON 500
- 5 -
3 INSTALLATION
3.1 Mechanical Dimensions
2-wire Conductivity Transmitter
lpha CON500
3.13.2 Wall Mount

Instruction Manual CON 500
- 6 -
3.23.3 Panel Mount
1. Prepare panel cut-out of
92.0 mm by 92.0 mm
2. Remove back cover of
transmitter and slide it
through panel cut-out
Panel (side)
3. Attach lugs to either
side of transmitter
4. Thread rods through
lugs until transmitter
is held in place against
panel

Instruction Manual CON 500
- 7 -
4 DISPLAY AND KEYPAD FUNCTIONS
4.1 Display
The LCD has a primary and secondary display.
•The primary display shows the measured conductivity value.
•The secondary display shows the measured temperature. In Calibration
mode, measured conductivity values are displayed here.
SETUP MEAS CAL
ON
°C
-.8.8.8
-1.8.8.8
ATC
mS
R.
ERR
123 4
5
6
7
8
9
10
11
12
13
15
16
14
μ S
%
K=
Primary Display
(Upper Display)
Secondary Display
(Lower Display)
1. SETUP - Setup mode
indicator
5. % - Temperature
Coefficient
indicato
r
9. ATC - Automatic Temp.
Compensation 13. - Calibration
standard indicator
2. MEAS - Measurement
mode indicator
6. mS - Milli Siemens
indicator
10. K = - Cell Constant
indicator.
14. ON /OFF– READY set
up enable/disable
indicator.
3. CAL - Calibration mode
indicator 7. µS - Micro Siemens
indicator
11. ERR – Wrong key
press error
indicato
r
15. HOLD – Hold indicator
4. R. – Line Resistance in
Ohms
8. °C - Temperature
indicator 12. - Electrode indicator
16. READY – Ready
indicator

Instruction Manual CON 500
- 8 -
4.2 Keypad
2-wire Conductivity Transmitter
lpha CON500
MEAS
°C
READY
.
A
TC
1413
μ S
The four-button keypad allows easy and quick operations of the Transmitter.
Key Function
CAL Brings you directly into the Calibration mode.
2.If you were in Conductivity Measurement mode, press CAL to enter
Conductivity Calibration mode.
▲/ ▼1.To scroll through the various submenus
2.To increment/decrement values or toggle between options (in the
SETUP/CAL modes)
3.When pressed together, serves as escape function to return to MEAS
mode from any point (CAL or SETUP modes).
ENT 1.To confirm your calibration values in Calibration mode.
2.To confirm selections in SETUP mode.
While in MEAS mode, pressing ENT takes you directly to SETUP submenu
NOTE: Error indicator ‘ERR’ will be displayed if an invalid key is pressed during a
particular operation.
5

Instruction Manual CON 500
- 9 -
5 CALIBRATION
4.15.1 Important Information on Transmitter Calibration
Calibration should be carried when you are using your transmitter with a new
electrode for the first time or when you suspect that the transmitter/electrode is out
of calibration. Your transmitter allows you to perform temperature calibration and
conductivity calibration.
As temperature readings affect the accuracy of conductivity measurements, it is
recommended that temperature calibration should be carried out only if the
temperature value displayed on the transmitter is different from that of a calibrated
thermometer. A temperature offset calibration of ± 5 °C from the default reading is
allowed. Once a temperature calibration is performed, conductivity calibration
should be carried out to ensure the accuracy of conductivity measurements are
maintained.
Your transmitter has up to six selectable conductivity measuring ranges. The
selection for the sixth range, range 6 (0.00 to 199.9 mS/cm), only appears in the
Setup mode if the cell constant is selected to be K =1.0 or K =10 whereas range
1(0.00 to 19.99uS/cm), will only appear when cell constant is selected to be K = 0.1
or K = 1.0. Other wise, the selection will be limited to five ranges only.
You can only calibrate one point in the measuring range that you have selected for
your process application. You have to recalibrate your transmitter every time you
change the measuring range since the calibration data of your transmitter will be
erased every time a new measuring range is selected.
During conductivity calibration, the transmitter allows a calibration window of ± 40%
from the measured default reading of the calibration standard. The minimum
allowable calibration point is 10% of the full scale reading of the range selected.
For best results, select a standard value close to the sample value you are
measuring. Alternatively use a calibration solution value that is approximately 2/3
the full-scale value of the measurement range you plan to use. The following table 1
lists the corresponding conductivity ranges. You should calibrate, in the range that
you have selected, using a solution that falls between the values in the
“recommended calibration solution range” column.

Instruction Manual CON 500
- 10 -
Table 1
Conductivity
Measuring Range
Recommended Calibration Solution
Range
0.00 Æ19.99 μS 6.00 to 17.00 μS
0.0 Æ199.9 μS 60.0 to 170.0 μS
0 Æ1999 μS 600 to 1700 μS
0.00 Æ10.00 mS 6.00 to 7.00 mS
0.00 Æ19.99 mS 6.00 to 17.00 mS
0.0 Æ199.9 mS 60.0 to 170.0 mS
To view current calibration point, see Section 6.8 - Viewing Calibration .
Do not reuse calibration solutions after calibration. Contaminants in the solution can
affect the calibration, and eventually the accuracy of the measurements. Use fresh
calibration solution each time you calibrate your meter.
NOTE: Your transmitter is factory set to a temperature coefficient of 2.1% per °C.
For most applications this will provide good results. The factory default value
for normalization temperature is 25 °C. If you need to set a different
temperature coefficient or change the normalization temperature value, see
Section 6.5 - Temperature Coefficient and Normalization Temperature
Setting for further information.
NOTE: In the CAL mode, the 4/20 mA output current will be automatically held.
‘HOLD’ will be displayed on LCD. After calibration is performed and when the
transmitter is back to the measurement mode, the ‘HOLD’ is automatically released.
Please refer to section 6.3 for more details.

Instruction Manual CON 500
- 11 -
5.2 Temperature Calibration
You need to perform temperature calibration if your transmitter temperature reading
is inaccurate or if the transmitter’s cell constant setting is changed. It is because the
transmitter’s temperature offset calibration will be erased once a new cell constant
is selected.
It is important to ensure that temperature calibration is carried out first prior to
conductivity calibration since temperature readings affect the accuracy of
conductivity measurements. Your transmitter allows a one point temperature
calibration using reference of a thermometer known to be accurate. Please refer to
Section 6.2 - Temperature Compensation Setting for temperature calibration
procedure.

Instruction Manual CON 500
- 12 -
5.3 Conductivity Calibration
A 1-point Calibration is required for this transmitter. If
the calibration process is aborted, your transmitter
will revert to the previous calibration data.
1. Organize your calibration standard solution
in two beakers – one for rinsing and the
other for calibration. Prepare separate de-
ionized water for electrode rinsing.
2. Rinse the electrode in de-ionized water and
then rinse with the calibration standard.
3. Dip the electrode to the calibration standard
intended for calibration and swirl gently to
create a homogenous sample. Wait for the
reading to stabilize.
4. Press the CAL key to enter calibration
mode. The upper display will show the
measured reading based on the last
calibration setting whereas the lower display
will show the measured default reading of
the standard.
5. Use the ▲or ▼keys to adjust the upper
display to the calibration standard value.
Note: You can offset the conductivity reading within
± 40% from the default reading of the standard. The
minimum allowable calibration point is 10% of the full
scale reading of the range selected.
6. Press the ENTER key to confirm the calibration value and to return to the
measurement mode.
Note: To exit this program without confirming the calibration, press the ▲and ▼
keys together (Escape).
Note: When there is a calibration error, the buffer icon and ERR annunciator will
appear together with a blinking electrode icon. Press both ▲and ▼keys together
TWICE to return to the measurement mode.
HOLD
HOLD
MEAS
°C
1578
25.5
ATC
μ S
CAL
1578
1578
μ S
CAL
1413
1578
μ S

Instruction Manual CON 500
- 13 -
6 ADVANCED SETUP FUNCTIONS
The advanced setup mode lets you customize your transmitter’s preferences and
defaults. This transmitter features different sub groups that organize all setup
parameters. The sub-groups are:
6.1 Range and Zooming Selection Setting
Your CON 500 transmitter provides six selections of conductivity measurement
ranges to suit your process application needs. Zooming selection is available where
both the 4 mA and 20 mA output current can be assigned to specific conductivity
values for a more refined output.
From the measurement mode,
1. Press the ENT key to enter the setup mode.
Transmitter displays ‘SEt rng’ indicating the
range setup mode.
2. Press the ENT key again. The display will show
the last set conductivity measurement range.
3. Use the ▲or ▼keys to scroll through the six
ranges and press the ENT key to select your
desired range. The transmitter will now switch to
the zooming selection and display the low zoom
value setup.
NOTE: Range 6 selection page will only appear in the
setup mode when the cell constant is selected as K =
1.0 or K = 10. Range 1 will only appear when cell
constant is selected as K =0.1 or K =1.0
SETUP
HOLD
SETUP
HOLD
19.99
1
Six Range selection
μ S

Instruction Manual CON 500
- 14 -
4. For zooming setting, use the ▲or ▼keys to set
the conductivity low zoom value for the 4 mA
current and press the ENT key to confirm. The
transmitter now displays the high zoom value
setup.
5. Use the ▲or ▼keys again to set the
conductivity high zoom value for the 20 mA
current and press the ENT key to confirm and
return to the range setup mode.
3.6. Press both ▲and ▼keys together to return to
the measurement mode.
SETUP
HOLD
0.00
L
SETUP
HOLD
19.99
Hi
μ S
μ S