Cole-Parmer Cond 500 Instruction Manual

Operating Instructions

Cole-Parmer CON 500

Conductivity/TDS/Temperature Controller

Cole-Parmer Instrument Company

625 East Bunker Court, Vernon Hills, Illinois 60061
Tel: [phone] or Toll-free: 1-800-323-4340

Fax: [phone]
www.coleparmer.com

CONTENTS page
I. INITIAL INSPECTION AND ASSEMBLY 2
II. GENERAL INTRODUCTION 3
III. USING THE CON 500 4
A.FRONT PANEL 4
B.NORMAL MODE DISPLAY 5
C.REAR CONNECTORS 7
D.TURNING ON/OFF THE INSTRUMENT 8
IV. MODEL CON 500 MODES 9

A. MAIN DISPLAY MODE 9
B. CALIBRATION/SETTING MODE 11

a.PASSWORD CHECK PAGE 12
b.USER SETTING PAGE 12
c.CONDUCTIVITY CALIBRATION PAGE 13
d.CONDUCTIVITY CONTROL SETTING PAGE 16
e.CURRENT SETTING PAGE 17
f.TEMP. CONTROL SETTING PAGE 17

V. CONTROLLING THE RELAYS 18

A. RELAY ISOLATION VOLTAGE 18
B. RELAY OUTPUT LOAD 18
C. RELAY ACTION, SETPOINT, HYSTERESIS

MODE &HYSTERESIS VALUE 18
D. CONDUCTIVITY/TDS RELAYS 19
E. TEMPERATURE RELAY 19
VI. 4-20 mA OUTPUT 20
A. ISOLATION VOLTAGE 20
B. OUTPUT LOAD 20
C. CONDUCTIVITY OR TDS LINEAR CURRENT

OUTPUT 20
VII. RS485 INTERFACE OPERATION 21
A. INTRODUCTION 21
B. PREPARING THE METER 21
VIII.ERROR DISPLAYS AND TROUBLESHOOTING 22
IX. SPECIFICATION 23
X. WARRANTY 24
XI. RETURN OF ITEMS 24

1

I. INITIAL INSPECTION AND ASSEMBLY

Carefully unpack the instrument and accessories. Inspect for damages made in
shipment. If any damage is found, notify your Cole-Parmer representative
immediately. All packing materials should be saved until satisfactory operation is
confirmed.

MOUNTING PROCEDURE

1. Make a cutout on any panel, with a thickness of 1/16 in. (1.5 mm)

to 3/8 in. (9.5mm).

2. Remove the mounting assembly from the controller and insert the

controller into the cutout.

3. Replace the mounting bracket assembly onto the controller and

secure the controller to the mounting panel.

PANEL CUTOUT DIMENSIONS

0.04"R(1.0mm) MAX.

0.04

3.66"

93.00mm?

0.00

1.00

0.00

3.66"

93.00mm?

0.04

0.00

1.00

0.00

Warning:

If the equipment is used in a manner not specified by the manufacturer, the
protection provided by the equipment may be impaired.

2

Cleaning the instrument:

1. Be sure to remove the power before attempting to clean the meter.

2. Use a lint free cloth and clean water or neutral detergent.

3. Wipe the outer surface of the instrument only.

4. Wipe-dry the instrument before powering again.

II. GENERAL INTRODUCTION

The Cole-Parmer CON 500 (Conductivity and Temperature) System, is a rugged
microprocessor based instrument assembled in a watertight ¼ DIN case,
designed for use in laboratories and process control applications.

The model CON 500 microprocessor allows the user to easily recalibrate the
parameters for the probes. The Conductivity system requires only a single
calibration. The microprocessor also performs a self-diagnostic routine every time
you turn on the unit providing you with basic information about the stability of the
instrument.

The system simultaneously displays Conductivity, Temperature, relay status and
mA output in one LCD graphic screen. This system uses a two-wire or four-wire
type sensor for the conductivity and a precise thermistor for temperature,
providing you with accurate readings for all your measurements.

The model CON 500 is equipped with three relays: two programmable High/Low
control relays for conductivity/TDS and one programmable High/Low control relay
for temperature. All relays are hysteresis driven and configurable to CENTER or
EDGE mode. The system also has an isolated 4-20mA analog output, offset and
span configurable for Conductivity/TDS display.

The model CON 500 comes with a RS485 interface which can easily let the user
log all data with an IBM© PC/AT compatible computer.

3

III. USING THE CON 500

A. FRONT PANEL

1. The [MODE/-] key.

1a. In Normal mode, pressing this Key will change the display to Conductivity or
TDS.

1b. In Calibration/Setting mode, pressing this key will move to the next digit of
the current active parameter.

1c. In Calibration/Setting mode, pressing this key for 2 seconds will move you
back to the previous parameter. Pressing this key for 2 seconds at the first
parameter of the page will move you back to last parameter of the previous page.

2. The [CAL/VIEW] key.

2a. During any normal mode, pressing this key will switch to first
Calibration/Setting screen.

2b. During Calibration/Setting mode, pressing this key will switch to the next
available Calibration/Setting page. Pressing this key at the last User/Calibration
page (TEMP. CONTROL SETTING page) will return the user to the Normal
mode.

4

3. The [] UP key.

456

During Calibration/Setting mode, pressing this key will increment the current
blinking digit of the active parameter.



4. The [] DOWN key.

During Calibration/Setting mode, pressing this key will decrement the blinking
digit of the active parameter.

5. The [] ENTER key.

During Calibration/Setting mode, pressing this key will save the current modified
parameter and move to the next parameter on the page. If the parameter is the
last one on the page then it will move to the first parameter on the next available
page.

6. The [ ] LIGHT key.

Pressing this key will turn on or turn off the backlight of the LCD. The backlight
will automatically turn off if there is no key activity within two minutes.

7. LCD screen.

B. NORMAL MODE DISPLAY

1

2

7

8

3

9

1. CELL – actual cell constant of the probe computed from the last cell constant
calibration. In TDS display it will show the TDS factor instead of the cell constant.

5

2. CURRENT OUT - this will display the actual output of the isolated 4-20 mA
output. At POWER-ON this will show “OFF” for about 3 seconds before going to

normal operation. After going to the Calibration/Setting pages when the unit is not
password locked this will show ”FROZEN” for about 3 seconds before returning to
normal operation.

3. ( ) key icon annunciator - this will be displayed if the Calibration /Setting
pages are locked, meaning the user will not be able to change the values unless

the correct 4 digit number has been entered at the PASSWORD CHECK page.

4. H1 or L1 annunciator -

displayed then the relay is ON. (H stands for high action control and L stands for
low action control)

this is the status of Conductivity/TDS Relay 1, if this is

5. H2 or L2 annunciator – this is the status of Conductivity/TDS Relay 2, if this is
displayed then the relay is ON.

6. H3 or L3 annunciator – this is the status of the Temperature Relay 3, if this is
displayed then the Relay is ON.

7. TC- user selected temperature coefficient of the conductivity/ TDS solution.

8. Conductivity or TDS display.

9. Temperature display.

6

C. REAR CONNECTORS

Before wiring the probes, relays, analog output, RS485 and the power cord, be
sure that you are connecting to the right terminal as shown above (be sure the
ac-plug is not plugged-in). Remember that the unit is ON once the user plugs in
the power cord to an AC power supply.

1. Connect the AC line to the rear of the instrument. The model can be used with
115 or 230 VAC 50/60 Hz. Power consumption is 6 watts. Make sure the
EARTH connector is connected to the earth lead of the AC power line.

2. Connect the proper load to the output relays. Make sure that the load does
not exceed the relay rating, 5 Amp at 115 VAC and 2.5 Amp at 230 VAC.

3. Set the proper load to the 4-20mA output connector. Make sure that the load
impedance is less than 500 Ohms.

4. If the user uses a two-wire conductivity probe, the user needs to short terminal
D1 with terminal S1 and terminal D2 with terminal S2.

CAUTION: Make sure you connect the AC power cord to the correct AC

terminals. Connecting incorrectly may damage the unit permanently.

7

D. TURNING ON/OFF THE INSTRUMENT

By just plugging the unit to a correct AC
voltage, the unit will be ready for use.
There is no Power key so unplugging
and plugging the unit will turn OFF or
turn ON the unit respectively.
After the unit is turned on, it will perform
some basic self diagnostics and will
display “OK” or “BAD”. If you received
any “BAD” messages, turn OFF the unit
and turn it ON again.
(see VIII. ERROR DISPLAYS AND

TROUBLESHOOTING).
If the message persists, then you might need to call our Applications Specialists.
After the self-diagnostic is complete, the temperature will be displayed on the

lowest part of the screen and you are ready to make conductivity or TDS
measurements. Just immerse the probes halfway to the liquid. If possible do not
allow the probes to touch any solid object in the solution. There should be no air
bubbles around the probes either. Shaking or moving the probes vigorously
before recording any measurement will dislodge any bubbles formed in the
probes.

PROBE HANDLING AND MAINTENANCE

REMINDER: If the user uses a two-wire conductivity probe, the user needs to

short terminal D1 with terminal S1 and terminal D2 with terminal S2.

Handling the probe

To ensure accurate and repeatable results:

1. The probe (cell) must be clean before making any measurements. If measuring
low conductivity solutions, extraordinary cleanliness may be necessary.

2. The probe cell plates must be totally submerged in the solution. The electrode
chamber must be free of trapped air or particulates. You may need to tap the
probe gently to dislodge any air bubbles.

8

3. Ideally, the probe should be at least 1/4 inch away from any object, including
the sides and bottom of the container.

4. Stirring may be necessary for high accuracy readings.

5. If possible, isolate the solution container from ground potentials.

6. Electrical fields and stray currents caused by stirrer motors, heaters, etc., can
interfere with the measurements. The user should determine the effects of these
and make the necessary corrections either by shielding or by disconnecting those
units that cause trouble.

7. Always rinse the cell carefully before using it in another solution.

8. Never store a dirty or contaminated probe.

Storing the probe

1. Always rinse the probe thoroughly with de-ionized or clean tap water to remove
contaminants before storing it.

2. For short-term storage it is recommended to immerse the probe in deionized
water to keep the plates wet. For long-term storage, after rinsing the probe
thoroughly, the exterior body should be wiped dry before storing it.

IV. MODEL CON 500 MODES

A. MAIN DISPLAY MODE

Turning ON the unit will always display
Conductivity in normal mode.
This instrument is designed to provide
3 distinct measurements:

1. Temperature - current temperature
of the solution.

2. Compensated Conductivity –
conductivity reading adjusted to a
calculated value which would have

been read if the sample had been at the user reference temperature.

9

a

The conductivity of solutions of ionic species is highly dependent on temperature,
varying as much as 3% for each change of 1°C (Temperature Coefficient (TC) =
3%/°C). In addition, the temperature coefficient itself varies with the nature of the
ionic species present.
Because the exact composition of a natural media is usually not known, it is best
to report a conductivity at a particular temperature, e.g. 10.2 mS at 15°C. How
ever in many cases, it is also useful to compensate for the temperature
dependence in order to determine at a glance if gross changes are occurring in
the ionic content of the medium over time. For this reason, the model CON 500
allows the user to output conductivity in either raw or compensated form. If the
User Temperature Coefficient (TC) is set to 0.00% then an uncompensated
Conductivity is output to the screen. If the TC is not zero then the Model CON 500
uses the temperature, TC, raw Conductivity and the reference temperature to
display the compensated Conductivity.

The calculation is carried out as in the equation below:
Compensated Conductivity = Conductivity/(1+TC*(T- RT))

Where: TC = Temperature Coefficient

T= Solution temperature

RT= Reference Temperature

Note:

The TDS is based on the specific conductance reading of the solution, setting the
TC to 0.00% will change the reading of conductivity to uncompensated
conductivity.

3. Total Dissolved Solid (TDS) –The calculation is carried out as in the equation
below:

TDS = Compensated Conductivity * (TDS Factor)

TDS – is an approximation of the total weight of all solids that are dissolved in a
volume of water. This is expressed in ppt (parts per thousand) also referred as
g/L(gram per liter) or ppm (parts per million) also referred as mg/L (milligram per
liter).

* In general, the total dissolved solids concentration is the sum of the cations
(+charged) and anions (-charged) ions in the solution. The TDS reading provides
a qualitative measure of the amount of dissolved ions, but does not tell us the
nature or ion relationships.

10

Temperature and Conductivity (or TDS) are always simultaneously displayed in
the graphic LCD screen in normal mode. You can select conductivity or TDS
reading by pressing the [MODE/-] key in normal mode.

B. CALIBRATION/SETTING MODE

Pressing the [CAL/VIEW] key for about 2 seconds during normal display mode
will bring-up the first page of 6 pages of the Calibration/Setting mode. Pressing
[CAL/VIEW] key will switch to the next page until the last page, where pressing
[CAL/VIEW] again will return the user to main display mode.
Below is a simple flowchart showing the path of the [CAL/VIEW] key:

MAIN DISPLAY

PASSWORD

LOCKED?

VIEW/CHANGE PAGE

N
E

COND CALIBRATION PAGE

Z
O
R
F

COND CONTROL SETTING PAGE

L
O
R
T

COND CURRENT SETTING PAGE

N
O
C

TEMP. CONTROL SETTING PAGE

MAIN DISPLAY

NO

(PRESS CAL/VIEW

KEY 2 SECONDS)

YES

YES

ENTER

PASSWORD

YES

CORRECT
PASSWORD

COND CALIBRATION PAGE

COND CONTROL SETTING PAGE

COND CURRENT SETTING PAGE

TEMP. CONTROL SETTING PAGE

NO

N
E
Z
O
R
F

T
O
N

L
O
R
T
N
O
C

1. You can change any blinking options or digit by pressing the [] or [] keys.

2. For options in digit format you need to press the [MODE/--] key to move to the
next digit .

11

3. If you are satisfied with the selection you made you need to press the []
ENTER key to save the changes and move to the next option.

4. If you don’t need to change the current blinking option just press the []
ENTER key to move to the next parameter.

5. If you need to go back to the previous parameter press the [MODE/-] key for
2 sec.

a. PASSWORD CHECK page

You will only see this page if the unit is
password locked. To change any
settings or calibration you need to
unlock the system to remove the
“PASSWORD LOCKED” message.
You need to enter the correct 4-digit
number on the “ENTER PASSWORD”
input. You can still view all the pages
of Calibration/Setting mode if the
system is password locked by just
pressing the [CAL/VIEW] key on this

page. If the unit is “PASSWORD
LOCKED” going to Calibration/Setting mode will not affect the function of the
relays.

CAUTION: If the unit is not locked then every time the user enters the

Calibration/Setting mode the relays and analog out will be frozen.

b. USER SETTING page

You will only see this page if the unit
is not password locked. This page is
just a warning, telling you that all
relays are frozen, and that you can
calibrate and change the settings.

12

NOTE: FROZEN MEANS ALL THE RELAYS AND THE

ANALOG OUT WILL MAINTAIN THEIR LAST STATE UNTIL THE USER
RETURNS TO MAIN DISPLAY MODE.

c. CONDUCTIVITY ( & TDS) CALIBRATION page

1. BASE CELL K – this is the basic

probe cell constant. You can choose

0.01, 0.10, 1.0 or 10. Be careful in
changing this option since it will set
the actual cell constant to this value
and you must calibrate the cell
constant before you can accurately
use the unit.

2. RANGE – for every basic cell

constant you can choose 3 different
ranges for conductivity, and an additional 3 ranges if you want your relay controls
to be in TDS. Whichever you choose you can still view the reading in TDS or
conductivity but the relay control will always be what you choose here. Choosing
mS or uS range will let the conductivity readings trigger the relays set point,
choosing ppt/ppm will let the TDS readings trigger the relays. Conductivity and
TDS have the same range limit except for the units displayed.

3. REF. TEMP. – if the Temperature Coefficient (TC) is not zero, then the model
CON 500 will use the value here to calculate and display the compensated
conductivity or TDS. The display will be the value as if the temperature is the
Reference Temperature. The normal reference temperature is between 15 to
25°C but you can actually select between 10 to 29°C in this option.

4. TEMP. COEFF. – this will be used by conductivity or TDS if you want your

display to be compensated. Setting this option to 0.00% will disable
compensation. You can select between 0.00% to 4.99%.

5. TDS F & T– TDS Factor, this value is multiplied with the conductivity to get the
TDS value. The user can directly adjust this value from 0.300 to 0.999. T is the
real solution temperature.

6. C@25°C - if the user is calibrating the Cell Constant, the user must enter the
conductivity value of the standard solution at 25°C.

13

Before calibration remember to do the following:

1. Use properly stored standard solutions and a clean calibration container.

2. Rinse the probe with de-ionized or distilled water (wipe dry)

before using in standard solutions.

3. After immersing into the solution, let the reading stabilize for

about 1 minute and shake the probe lightly to remove any air
bubbles.

4. If possible and to minimize errors, perform the calibration as

close as possible to the selected reference temperature.

Accurate Calibration of the Model CON 500

1. Clean the probe thoroughly.

2. Wait for about 30 minutes after you turned on the instrument to stabilize the

circuitry before calibrating the probe.

3. Choose a calibration solution which most similar to the sample being

measured.

a. For seawater select 50 mS conductivity standard.

b. For fresh water select 1 mS conductivity standard.

c. For brackish water select 10 mS conductivity standard.

4. Select the correct base cell constant for the probe.

5. Select the correct range for the standard solution.

6. Input the temperature coefficient of the standard solution. Most standard salt

calibration solution has a TC between 1.91% to 2.00%. If the TC is not
available, use the default of 2.00%.

7. During calibration, the user reference temperature is disregarded. The

reference temperature is fixed at 25°C since this temperature is the most
popular reference temperature for all if not most standard solutions.

14

8. Immerse the probe into the solution. Do not let the probe touch any part of the

container and allow at least 1 minute so the temperature reading will stabilize.

9. Shake the probe lightly to remove air bubbles from the probe.

10. Wait for the conductivity reading to be stable.

11. Press the [ENTER] key to capture the stable reading and freeze the reading.

The model CON500 will blink at the first digit to tell the user that he/she can
now input the standard solution value.

12. Input the standard solution value by using the [

increment/decrement the blinking digit), the [MODE/-] key (to select another
digit).

13. Press the

CON500 will display a new cell constant.

14. The model CON500 is now ready for conductivity/TDS measurements.

[] key to save the standard solution value. After saving the model,

] and [] keys (to

Before reading the sample (unknown solution):

1. Clean the probe thoroughly.

2. Move to CONDUCTIVITY CALIBRATION page.

3. Set the RANGE to the approximate range of the solution.

4. If you want a compensated reading, input the most similar Temperature

Coefficient of the sample or use the default of 2.00%. Set the Temperature
Coefficient to 0.00% if you want just the raw uncompensated conductivity.

5. If the TC is not 0.00% you need to select a reference temperature or set it to

the default of 25°C.

6. Move the display to the normal mode.

7. Immerse the probe into the solution. Do not let the probe touch any part of

the container and allow at least 1 minute so the temperature reading will
stabilize.

8. Shake the probe lightly to remove air bubbles from the probe.

15

9. Read the display. Press the [MODE/-] key to toggle between conductivity and

TDS reading.

d. CONDUCTIVITY (or TDS) CONTROL SETTING page

1. RELAY1 (action) - the action for this
relay is changeable, you can choose “HI”-
action or “LO” action. (In HI-action, the
relay will turn ON if the conductivity or
TDS is greater or equal to RELAY1 value,
in LO-action, the relay will turn OFF if the
conductivity or TDS is greater or equal to
RELAY1 value, which is modified by the
hysteresis value and hysteresis mode. )

(See chapter V. CONTROLLING THE
RELAYS.)

Use []
After you select the RELAY1 action, you can now select the RELAY1 set point.
Use []
select another digit and the

2. RELAY2 (action) - the action for this relay is changeable, you can choose
“HI”-action or “LO” action. (In HI-action, the relay will turn ON if the conductivity
or TDS is greater or equal to RELAY2 value, in LO-action, the relay will turn
OFF if the conductivity or TDS is greater or equal to RELAY2 value, which is
modified by the hysteresis value and hysteresis mode.)

(See chapter V. CONTROLLING THE RELAYS.)

Use
After you select the RELAY2 action you can now select the RELAY2 set point.
Use []
select another digit and the

and [] keys to select the RELAY1 action and press [] key to save.

and [] keys to change the blinking digit, use the [MODE/-] key to

[] key to save the new set point.

[] and [] keys to select the RELAY2 action and press [] key to save.

and [] keys to change the blinking digit, use the [MODE/-] key to

[] key to save the new set point.

3. HYSTERESIS (mode) -this is the hysteresis mode for conductivity or TDS
RELAY1 and RELAY2. You can choose “CENTER” or “EDGE” mode. (See
chapter V. CONTROLLING THE RELAYS.)

4. HYSTERESIS (value) - this is the actual value of the hysteresis.

16

e. CURRENT SETTING page

1. 4mA OUT (offset)– this value will be
used in conjunction with 20 mA to plot the
current output. (See chapter VI. 4-20 mA
OUTPUT.)

2. 20mA OUT (span) – this value will be
used in conjunction with the 4 mA value to
plot the output. (See chapter VI. 4-20 mA

OUTPUT.)

f. TEMP. CONTROL SETTING page

1. RELAY 3 - the temperature has only
one relay to control you need to set what
action it will use, HIGH or LOW action. (In
HIGH-action the relay will turn ON if the
temperature is greater or equal to RELAY3
value, in LOW-action the relay will turn
OFF if the temperature is less than or
equal to RELAY3 value, which is modified
by the hysteresis value and hysteresis
mode.)
(See chapter V. CONTROLLING THE
RELAYS.)

2. SET POINT (For positive temperature only) - this is the user changeable
value for the Temperature relay.

3. HYSTERESIS (mode) - this is the hysteresis mode for TEMPERATURE relay.
You can choose “CENTER” or “EDGE”. ( See chapter V. CONTROLLING THE
RELAYS.)

4. HYSTERESIS (value) - this is the actual value of the hysteresis. You can
change this value from 0.0 to 19.9°C.（See chapter V. CONTROLLING THE
RELAYS.)

5. RS 485 ID – this is the unique ID/Address for the unit. If you are connecting
multiple model CON 500 or other Jenco models for logging purposes then this

17

ID/Address must be unique for each connected unit. This ID/Address is the same
address that must be used by the PC program to communicate with this unit.

6. PASSWORD SET - this is your security code. If the unit is locked the value
here will not be available. You need to input the correct code in the PASSWORD
CHECK page.

CAUTION: The user is responsible in remembering their password

number otherwise you would no be able to calibrate or change the settings.

V. CONTROLLING THE RELAYS

A. RELAY ISOLATION VOLTAGE

The maximum isolation voltage of the relay output contacts is 1500 VDC. The
voltage differential between the relay output contacts and the load should not
exceed 1500 VDC.

B. RELAY OUTPUT LOAD

The current through the relay output contacts should not exceed 5 Amp at 115
VAC and 2.5 Amp at 230 VAC in order not to cause permanent damage to the
relay contacts. This rating is specified for resistive loads only.

C. RELAY ACTION, SETPOINT, HYSTERESIS MODE &
HYSTERESIS VALUE

If the relay action is set to HI and the hysteresis mode is CENTER, the relay will
turn ON at [(RELAY SETPOINT ) + (0.5 * hysteresis value)], and will turn OFF at
[(RELAY SETPOINT) - (0.5 * hysteresis value)].

If the relay action is set to HI hysteresis mode is EDGE, the relay will turn ON at
[(RELAY SET POINT) + (hysteresis value)], and will turn OFF at (RELAY
SETPOINT).

If the relay action is set to LO and the hysteresis mode is CENTER, the relay will
turn OFF at [(RELAY SET POINT) + (0.5 * hysteresis value)], and will turn ON at
[(RELAY SETPOINT) - (0.5 * hysteresis value)].

18

If the relay action is set to LO hysteresis mode is EDGE, the relay will turn OFF at

.

.

[(RELAY SET POINT) + (hysteresis value)], and will turn ON at (RELAY
SETPOINT).

Relay Action Hysteresis mode Effective RELAY-

ON Set point

Effective RELAY-

OFF Set point
HIGH CENTER S.P.+ ½(H.V.) S.P. -½ (H.V.)
HIGH EDGE S.P. S.P. –(H.V)
LOW CENTER S.P.-½ (H.V.) S.P.+½ (H.V.)
LOW EDGE S.P S.P.+(H.V.)

S.P. = Relay Set point
H.V.= Hysteresis value (DeadBand)

D. CONDUCTIVITY/TDS RELAYS

LOW
SET

POINT

ON

SP

ON

hysteresis

Low set ON/OFF control

LOW
SET

POINT

ON

Fig. 1

ON

hysteresis hysteresis

Low set ON/OFF control

OFF

COND.

OFF

OFF

OFF

hysteresis

High set ON/OFF control

EDGE CONTROL

HIGH

SET

POINT

OFF

COND. COND

OFF

OFF

OFF

High set ON/OFF control

CENTER CONTROL

HIGH

SET

POINT

SP

ON

ON

There are two independent
Relay channels for the TDS
or conductivity display which
has independent set point

ON

and HIGH or LOW action
setting (see fig. 1). The

COND

hysteresis mode (center or
edge, see figure 1.) and
hysteresis value will be used
by both relays.

The action of the relays
is dependent on set point,
relay action (HIGH or LOW),
hysteresis mode (Edge

ON

or Center ) , hysteresis value
and the current conductivity
or TDS display. (see fig. 1 ).

Fig. 1`

19

E. TEMPERATURE RELAY

C

.

One relay channel is available for temperature display which has independent set
point and HIGH or LOW action (see fig. 1) setting, hysteresis mode (center or
edge) and hysteresis value.

The action of the Temperature relay is dependent on set point, relay action (HIGH
or LOW), hysteresis mode (Center or Edge), hysteresis value and the current
Temperature display. (See fig. 1).

VI. 4 - 20 mA OUTPUT

A. ISOLATION VOLTAGE

The maximum isolation voltage of the 4-20 mA output is 500 VDC. The voltage
differential between the 4-20 mA output and the load should not exceed 500
VDC.

B. OUTPUT LOAD

The maximum load is 500 . Output current inaccuracies may occur for load
impedance in excess 500 .

C. CONDUCTIVITY OR TDS LINEAR CURRENT OUTPUT

mA mA

20mA

4mA 4mA

Adjustable

Bandwidth Bandwidth

Set
point point

Decreasing current for
increasing conductivity

COND.

20mA

Fig. 2

20

Adjustable

Set

Increasing current for
increasing conductivity

OND

The linear analog output will be dependent on the 4 mA setting, 20 mA setting
and the current conductivity or TDS display.
The analog output is based on the following equation :
mA
Where :
mA
D
C(4) = conductivity or TDS user setting for 4 mA
C(20) = conductivity or TDS user setting for 20 mA.

= 4mA + (16mA) * (D

(c)

= analog output

(c)

= current conductivity or TDS display

(c)

- C(4)) / (C(20) – C(4))

(c)

Note :

1. The absolute difference of the 4mA and 20mA settings must be
greater or equal to 10 LSD(Least Significant Digit) of the user range.

2. If the absolute difference is smaller than 10 LSD the current output will

display “ERROR”.

VII. RS485 INTERFACE OPERATION

A. INTRODUCTION

This section assumes you are familiar with the basics of computer programming,
data communication, the RS485 interface and possess a copy of any
programming language software capable of interfacing with a RS485 card or a
RS232-RS485 converter (third party vendor) module.

A demo program for Windows (XP, 7) is included in the accompanying disk.

B. PREPARING THE METER

This meter comes equipped with a 2-wire RS485 interface. Just connect each
terminal to the respective RS485 terminal on your PC. (If the DEMO program is
not working, try reversing the connections of the terminals.) After you have
connected the meter (or multiple meters with unique ID number) correctly and
turned on both the meter(s) and the computer, you are now ready to program a
simple routine to read data from the instrument.

Read the included file “Model CON500 protocol.doc” to help you make a program
to communicate with the Model CON500.

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VIII. ERROR DISPLAYS AND TROUBLESHOOTING

LCD
display

"TERR" "OVER" Conductivity, TDS

"TERR" "UNDR" Conductivity, TDS

"OVER" -10.0~

"LERR" -10.0 ~

EEPROM :
BAD

ROM : BAD

RAM : BAD

ATC
display mode

or Cell Calibration

or Cell
Calibration
Conductivity, TDS

120.0°C

120.0°C

Power-on Unit has failed its EEPROM

Power-on Unit has failed its ROM test.

Power-on Unit has failed its RAM test.

or Cell Calibration
Conductivity, TDS

or Cell Calibration

Possible cause(s)
[Action(s)]

a. Temperature > 120.0°C.
[Bring solution to a lower
temperature.]
[Replace temperature probe.]
b. No temperature sensor.
[Use a temperature probe.]
Temperature < -10.0°C.
[Bring solution to a higher
temperature.]
Reading over user specified
range.
[Change range to higher level]
Compensated Calibration
exceeds temperature limit.
[Increase or decrease the
solution temperature]

test.
[Turn instrument OFF and
back to ON again.]
[Return for service. (see
Warranty)]

[Turn instrument OFF and
back to ON again.]
[Return for service. (see
Warranty)]

[Turn instrument OFF and
back to ON again.]
[Return for service. (see
Warranty)]

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IX. SPECIFICATIONS

Conductivity/TDS

Range Basic Cell K Resolution Accuracy

0 to 9.999 uS/ppm 0.01 0.001 uS/ppm 0.5% ±1 LSD
1 to 99.99 uS/ppm 0.01 0.01 uS/ppm 0.5% ±1 LSD
10 to 300.0 uS/ppm 0.01 0.1 uS/ppm 0.5% ±1 LSD

0.0 to 99.99 uS/ppm 0.1 0.01 uS/ppm 0.5% ±1 LSD
10 to 999. 9 uS/ppm 0.1 0.1 uS/ppm 0.5% ±1 LSD

0.1 to 3.000 mS/ppt 0.1 0.001 mS/ppt 0.5% ±1 LSD
0 to 999.9 uS/ppm 1.00 0.1 uS/ppm 0.5% ±1 LSD

0.1 to 9.999 mS/ppt 1.00 0.001 mS/ppt 0.5% ±1 LSD

1.0 to 30.00 mS/ppt 1.00 0.01 mS/ppt 0.5% ±1 LSD
0 to 9.999 mS/ppt 10.0 0.001 mS/ppt 0.5% ±1 LSD
1 to 99.99 mS/ppt 10.0 0.01 mS/ppt 0.5% ±1 LSD
10 to 300.0 mS/ppt 10.0 0.1 mS/ppt 0.5% ±1 LSD

Temperature

Range Resolution Accuracy

-10.0 to 120.0 °C 0.1 °C ±0.3 °C

Conductivity / TDS
TDS Factor Range 0.300 to 0.999 (user selectable)

Reference Temperature 10°C to 29°C (user selectable)
Temperature Coefficient 0.00 to 4.99% (user selectable)
Temperature Compensation Automatic

Temperature
Temperature sensor Thermistor, 10 k at 25°C
4-20mA Output
Current output range 4 to 20 mA (isolated)

Current output scale user programmable
Maximum load 500 　
Accuracy ± 0.1 mA
Isolation voltage 500VDC

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Controller
Control type ON/OFF control

Relay output 5A at 115VAC or 2.5A at 220VAC
GENERAL
Keys Audio feedback in all keys

Security protect 4-digit password
Communication RS485
Power: 115VAC or 230VAC 50/60Hz
Power consumption 6 watts
Fuse 315mA/250V fast acting glass tube
Ambient temperature range 0.0 to 50.0 °C
Display: 128x64 graphic LCD w/ backlight
Case IPT65 ¼ DIN case, depth 148mm
Weight 950 g

X. WARRANTY

The Cole-Parmer Instrument Company warrants this product to be free from
significant deviations in material and workmanship for a period of one year. If
repair or adjustment is necessary and has not been the result of abuse or
misuse, within the twelve month period, please return, freight-prepaid, and
correction will be made without charge (see note on return of items). Cole­Parmer alone will determine if the product problem is due to deviations or
customer misuse.
Out of warranty products will be repaired for a nominal charge.

XI. RETURN OF ITEMS

Authorization must be obtained from our Customer Service Department before
returning items for any reason. When applying for authorization, please include
data regarding the reason the items are to be returned. A restocking charge will
be made on all unauthorized returns.

For your protection, items being returned must be carefully packed to prevent
damage in shipment and insured against possible damage or loss. Cole­Parmer will not be responsible for damage resulting from careless or insufficient
packing.

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Note : The Cole-Parmer Instrument Company reserves the right to make

improvements in design, construction and appearance of our products without
notice.

We stand behind our products. For additional information on our products,
warranty, or returns please contact our office or visit our website listed on
front page.

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英文说明书

机型：Con500 编制人：汪蕾 日期：2013-04-10
文件编号：KCon500-02 修改人：汪蕾 日期：2013-04-10
版本：02 核准人： 日期：

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