Walchem WCT400 Series User manual

WCT400/410 Series
Cooling Tower Conductivity Controller
Instruction Manual
Five Boynton Road Hopping Brook Park Holliston, MA 01746 USA
TEL: [phone] FAX: [phone] WEB: www.walchem.com
W
CT400/410 Controllers
W A L C H E M
IWAKI America Inc.

Notice
© 2014 WALCHEM, Iwaki America Inc. (hereinafter “Walchem”)
5 Boynton Road, Holliston, MA 01746 USA
[phone]
All Rights Reserved
Printed in USA
Proprietary Material
The information and descriptions contained herein are the property of WALCHEM. Such information
and descriptions may not be copied or reproduced by any means, or disseminated or distributed without
the express prior written permission of WALCHEM, 5 Boynton Road, Holliston, MA 01746.
This document is for information purposes only and is subject to change without notice.
Statement of Limited Warranty
WALCHEM warrants equipment of its manufacture, and bearing its identification to be free from
defects in workmanship and material for a period of 24 months for electronics and 12 months for
mechanical parts and electrodes from date of delivery from the factory or authorized distributor under
normal use and service and otherwise when such equipment is used in accordance with instructions
furnished by WALCHEM and for the purposes disclosed in writing at the time of purchase, if any.
WALCHEM's liability under this warranty shall be limited to replacement or repair, F.O.B. Holliston,
MA U.S.A. of any defective equipment or part which, having been returned to WALCHEM,
transportation charges prepaid, has been inspected and determined by WALCHEM to be defective.
Replaceable elastomeric parts and glass components are expendable and are not covered by any
warranty.
THIS WARRANTY IS IN LIEU OF ANY OTHER WARRANTY, EITHER EXPRESS OR IMPLIED, AS
TO DESCRIPTION, QUALITY, MERCHANTABILITY, FITNESS FOR ANY PARTICULAR PURPOSE
OR USE, OR ANY OTHER MATTER.
180324. K
April 2014

TABLE OF CONTENTS
1.0 INTRODUCTION........................................................................................................................1
2.0 SPECIFICATIONS.....................................................................................................................2
2.1 Measurement Performance....................................................................................................2
2.2 Electrical: Input/Output...........................................................................................................2
2.3 Mechanical.............................................................................................................................2
2.4 WCT Variables and their Limits..............................................................................................3
3.0 UNPACKING & INSTALLATION................................................................................................4
3.1 Unpacking the unit .................................................................................................................4
3.2 Mounting the electronic enclosure .........................................................................................4
3.3 Installation..............................................................................................................................4
3.4 Icon Definitions.......................................................................................................................4
3.5 Electrical installation...............................................................................................................8
4.0 FUNCTION OVERVIEW..........................................................................................................12
4.1 Front Panel...........................................................................................................................12
4.2 Display .................................................................................................................................12
4.3 Keypad.................................................................................................................................13
4.4 Access Code........................................................................................................................13
4.5 Startup..................................................................................................................................13
4.6 Shut Down............................................................................................................................13
5.0 OPERATION............................................................................................................................14
5.1 Main Menu ...........................................................................................................................14
5.2 Conductivity Menu................................................................................................................16
5.3 Temperature Menu...............................................................................................................18
5.4 Bleed Menu..........................................................................................................................19
5.5 Feed Menu...........................................................................................................................21
5.6 WM1 and WM2 Menus.........................................................................................................24
5.7 Bio1 and Bio2 Menus...........................................................................................................25
5.8 Time Menu...........................................................................................................................29
5.9 Conductivity Alarm Menu.....................................................................................................30
5.10 4-20mA Menu.......................................................................................................................31
5.11 Access Code Menu..............................................................................................................32
5.12 Datalog Menu.......................................................................................................................33
5.13 Config Menu.........................................................................................................................34
5.14 Upgrade Menu .....................................................................................................................35
6.0 MAINTENANCE.......................................................................................................................36
6.1 Electrode Cleaning...............................................................................................................36
6.2 Replacing the Fuses ............................................................................................................37
7.0 TROUBLESHOOTING.............................................................................................................37
7.1 Error Messages....................................................................................................................37
7.2 Conductivity Readout Does Not Change .............................................................................38
7.3 Procedure for Evaluation of Conductivity Electrode.............................................................39
8.0 SERVICE POLICY...................................................................................................................39

1
1.0 INTRODUCTION
The Walchem WCT400 Series controllers offer conductivity and watermeter-based control of cooling
tower water, control of corrosion/scale inhibitor feed, and with the WCT410 models, control of two
biocide pumps. The inhibitor pump may be selected to operate in one of the following modes:
Feed and Bleed
Feed and Bleed with Lockout
Feed as a percent of Bleed
Feed as a percent of Time
Feed based on a Water Contactor input
Feed based on a Paddlewheel water meter input
The WCT series cooling tower controllers are supplied with a temperature compensated carbon
electrode with a cell constant of 1.0. The controllers are microprocessor driven industrial type with
on/off control outputs. A timed sample mode may be selected, and on small towers can reduce
installation costs by eliminating the need for a sampling bypass line. An optional isolated 4-20 mA
output that is proportional to the conductivity reading is available for all models.
Any set point may be viewed without interrupting control. Each set point change will take effect as soon
as it is entered. An access code is available to protect set point parameters, while still allowing settings
to be viewed.
The model WCT410 biocide outputs are scheduled on a user selectable 1, 2, or 4 week cycle. Each
biocide output is independent and may be programmed for one add per day. (in 1, 2 or 4 week cycle) or
up to 10 times per day (in daily cycle). It is possible to add both chemicals in the same day, however, as
a safeguard they will not occur at the same time. Biocide outputs may use independent pre-bleeds and
lockout times. All outputs are interlocked with a flow switch input.
An alarm relay is provided with WCT410 models. It is triggered by:
Low Conductivity reading
High Conductivity reading
No Flow situation
Bleed Timeout
Sensor Error
Temp Error
Our unique USB feature provides the ability to upgrade the software in the controller to the latest
version.
An advanced USB capability option is available. The Config file feature allows you to save all the set
points from a controller onto a USB flash disk, and then import them into another controller, making the
programming of multiple controllers fast and easy. The data logging feature allows you to save the last
2 month’s readings and events to a USB flash disk.

2
2.0 SPECIFICATIONS
2.1 Measurement Performance
Conductivity Range 0 - 10,000 µS/cm (microSiemens/centimeter)
Conductivity Resolution 1 µS/cm
Conductivity Accuracy 10 - 10,000 µS/cm ±1% of reading
0 - 10 µS/cm ±20% of reading
Temperature Range 32 - 158°F (0 - 70°C)
Temperature Resolution 0.1°C
Temperature Accuracy ± 1% of reading
2.2 Electrical: Input/Output
Input Power
100-240 VAC, 50/60 Hz, 8A Fuse: 1.0 ampere, 5 x 20 mm
Input Signals
Conductivity electrode 1.0 cell factor, 10K thermistor
Flow Meter (optional) Isolated, dry contact closure required (i.e. relay, ,reed switch)
Flow Switch (optional) Isolated, dry contact closure required (i.e. reed switch)
Outputs
Mechanical Relays Pre-powered on circuit board switching line voltage
6 A (resistive), 1/8 HP
All relays are fused together as one group, total current for this
group must not exceed 6A
4 - 20 mA (optional) Internally powered
Fully isolated
600 Ohm max resistive load
Resolution .001% of span
Accuracy ± 1% of reading
Agency Approvals
Safety UL 61010-1:2012 3rd Ed.
CSA C22.2 No. 61010-1:2012 3rd Ed.
IEC 61010-1:2010 3rd Ed.
EN 61010-1:2010 3rd Ed.
EMC IEC 61326-1:2005
EN 61326-1:2006
Note: For EN61000-4-6, EN61000-4-3 the controller met performance criteria B.
*Class A equipment: Equipment suitable for use in establishments other than domestic, and those directly
connected to a low voltage (100-240 VAC) power supply network which supplies buildings used for
domestic purposes.
2.3 Mechanical Enclosure Material Polycarbonate
NEMA Rating NEMA 4X
Dimensions 8.5" x 6.5" x 5.5"
Display 2 x 16 character backlit liquid crystal
Operating Ambient Temp 32 – 122°F (0 – 50°C)
Storage Temperature -20 – 180°F (-29 – 80°C)
Graphite electrode pressure rating 150 psi
Stainless steel electrode pressure rating 150 psi
High pressure electrode & flow switch
manifold pressure rating 300 psi
Flow switch manifold pressure rating 150 psi
Flow switch manifold connections ¾" NPTF

3
2.4 WCT Variables and their Limits
Low Limit High Limit
Conductivity menu
PPM Conversion Factor 0.200 ppm/µS/cm 1.000 ppm/µS/cm
Interval Time (sampling) 5 minutes 24:00 hours
Duration Time (sampling) 1 minute 59 min: 59 sec
% Calibration Range -50 +50
Temperature Menu No variables
Bleed Menu
Set Point 0 µS/cm 10,000 µS/cm
Dead Band 5 µS/cm 500 µS/cm
Bleed Limit Time (set in hours/minutes) 1 minute 8 hrs: 20 min (enabled)
0=unlimited (disabled)
Bleed Volume 1 (gallons or liters) 9,999 (gallons or liters)
Makeup Volume 1 (gallons or liters) 9,999 (gallons or liters)
Feed Menu
Feed Lockout Timer (Mode A) 1 second 99 min: 59 sec
Percent of Bleed (Mode B) 5 % 99 %
Feed Time Limit (Mode B) 1 minute 99 min: 59 sec
Percent of Time (Mode C) 0.1 % 99 %
Feed Cycle Time (Mode C) 10 minutes 59 min: 59 sec
Time per Contact (Mode D) 1 second 59 min: 59 sec
÷ Contacts by (Mode D) 1 contact 100 contacts
Time Limit (Mode D & E) 1 minute 99 min: 59 sec
Time/Vol (Mode E) 1 second 59 min: 59 sec
Vol to Initiate Feed (Mode E) 1 9,999
WM1 and WM2 Menus
Gallons per Contact 1 gal/contact 500 gal/contact
Liters per Contact 1 L/contact 500 L/contact
K Factor (Paddlewheel) 0.01 pulse/vol 9,999.99 pulses/vol
Biocide Menus (WCT410 only)
Pre-Bleed (0 disables pre-bleed) 1µS/cm 9.999 µS/cm
Lockout 0 minutes 9 hrs:59 min
Add Time
Daily Adds 0 minutes 144 minutes
All other modes 0 minutes 1440 minutes
4-20 mA Menu 4 & 20 mA Settings 0 µS/cm 10,000 µS/cm
Access Code Menu New Value 0 9999
Alarm Menu* High & Low (set to zero to disable) 1% 50%
Datalog Menu (Optional) No variables
Config Menu (Optional) No variables
Upgrade Menu No variables
*Note: The Alarm relay is non-programmable. Refer to the Main Menu diagram on page 16 for the list of error
conditions that trigger the alarm relay.

4
3.0 UNPACKING & INSTALLATION
3.1 Unpacking the unit
Inspect the contents of the carton. Please notify the carrier immediately if there are any signs of damage
to the controller or its parts. Contact your distributor if any of the parts are missing. The carton should
contain: a WCT400 series controller and instruction manual. Any options or accessories will be
incorporated as ordered.
3.2 Mounting the electronic enclosure
The WCT series controller is supplied with mounting holes on the enclosure. It should be wall mounted
with the display at eye level, on a vibration-free surface, utilizing all four mounting holes for maximum
stability. Use M6 (1/4" diameter) fasteners that are appropriate for the substrate material of the wall.
The enclosure is NEMA 4X rated. The maximum operating ambient temperature is 122°F (50°C); this
should be considered if installation is in a high temperature location. The enclosure requires the
following clearances:
Top: 2" (50 mm)
Left: 8" (203 mm)
Right: 4" (102 mm)
Bottom: 7" (178 mm)
3.3 Installation
Once the WCT series controller is mounted, the metering pumps may be located at any distance from
the controller. The conductivity electrode should be placed as close to the controller as possible, to a
maximum distance of 250 ft. Less than 25 ft is recommended. The cable must be shielded from
background electrical noise.
Always route low voltage (sensor) signals with at least a 6” separation from AC voltage wiring.
Locate the electrode tee where an active sample of cooling tower water is available and where the
electrode can easily be removed for cleaning. It must be situated so that the tee is always full and the
electrode is never subjected to a drop in water level resulting in dryness. Refer to Figure 1 for typical
installation.
IMPORTANT: To avoid cracking the female pipe threads on the supplied plumbing parts, use no more
than 3 wraps of Teflon tape and thread in the pipe FINGER tight plus 1/2 turn! Do not use pipe dope to
seal the threads of the flow switch because the clear plastic will crack!
3.4 Icon Definitions
Symbol Publication Description
IEC 417, No.5019 Protective Conductor Terminal
IEC 417, No. 5007 On (Supply)
IEC 417, No. 5008 Off (Supply)
ISO 3864, No. B.3.6 Caution, risk of electric shock
ISO 3864, No. B.3.1 Caution

5
Figure 1 Typical Installation
METERING
PUMPS
HEAT
EXCHANGER
CIRCULATING
PUMP
SOLENOID
VALVE
COOLING TOWER
WATER
METER
Cooling Tower Controller
www.walchem.com
PREV NEXT
ENTER EXIT
FLOW
FLOW
FLOW SWITCH
ELECTRODE
SAMPLE VALVE
10.0" (254 mm)
1/4” POLYPRO PANEL
17" (432 mm)
Cooling Tower Controller
www.walchem.co m
PREV NEXT
ENTER EXIT

6
Figure 1a Typical Installation
Intermittent Sampling
TO ELECTRODE
TO SOLENOID
TO
CONSTANT
110 VOLTS
PE DISCHARGE
TUBING
CHEMICAL
PUMP TO
SANITARY
SERVER
SPRAY TOWER
SPRAY
PUMP
CITY WATER
MAKEUP
SHUTOFF
VALVE
(A)
(D)
(A)
(B) (F)
(C)
(E)
(A) Unions; installed for replacement of
solenoid, strainer or probe
(B) ½" solenoid
(C) ½" Y-strainer
(D) ¾" PVC threaded tee probe
(supplied with controller)
(E) ½" PVC bulkhead fitting
(
F
)
winter drain
TYPICAL INSTALLATION
INTERMITTENT SAMPLING
CHEMICAL
TANK
Cooling Tower Controller
www.walchem.com
PREV NEXT
ENTER EXIT

7
Figure 1b Typical Installation
Submersion Electrode
TO
110 VOLT AC
OUTLET
TO
SANITARY
SERVER
COOLING
TOWER
OPEN
SUMP
CIRCULATION
PUMP
(X) Unions; installed for replacement of
solenoid or strainer
(Y) ½" Y-strainer
(Z) ½"solenoid
TYPICAL INSTALLATION
SUBMERSION ELECTRODE
(OPTION "A")
VALVE
XYZX
VALVE
XYZX
(OPTION "B")
TO
SANITARY
SERVER
PROBE
NOTE: LOCATION OF SOLENOID VALVE
USING OPTION "A" OR OPTION "B"
DEPENDS ON SYSTEM CONFIGURATION.
DETAIL OF
PROBE ASSEMBLY
TO
CONTROLLER
1" PVC
PIPE
1" NPTF PVC
COUPLING
CLIP PROBE
ASSEMBLY TO
SUMP WALL FOR
EASY REMOVAL
FOR CLEANING
¾" PROBE
IN PVC TEE
INSTALLAPPROXIMATELY
HALF-WAY IN SUMP VOLUME
AVOID INSTALLATION NEAR
PUMP SUCTION INLET
CHEMICAL
PUMP
CHEMICAL
TANK
Cooling Tower Controller
www.walchem.com
PREV NEXT
ENTER EXIT

8
3.5 Electrical installation
The various standard wiring options are shown in figure 2. Your WCT series controller will arrive from
the factory prewired or ready for hardwiring. Depending on your configuration of controller options,
you may be required to hardwire some or all of the input/output devices. Refer to figures 3 and 4 for
circuit board layout and wiring.
Note: when wiring the optional flow meter contactor input, the 4-20 mA output or a remote flow switch,
it is advisable to use stranded, twisted, shield pair wire between 22-26 AWG. Shield should be
terminated at the controller ground stud (see figures 3 and 4).
CAUTION
1. There are live circuits inside the controller even when the power switch on the front panel is in
the OFF position! The front panel must never be opened before power to the controller is
REMOVED!
If your controller is prewired, it is supplied with a 8 foot, 18 AWG power cord with USA
style plug. A tool (#1 Phillips driver) is required to open the front panel.
2. When mounting the controller, make sure there is clear access to the disconnecting device!
3. The electrical installation of the controller must be done by trained personnel only and
conform to all applicable National, State and Local codes!
4. Proper grounding of this product is required. Any attempt to bypass the grounding will
compromise the safety of persons and property.
5. Operating this product in a manner not specified by Walchem may impair the protection
provided by the equipment.
POWER FEED
BLEED
PL
UG
CONDUCTIVITY
ELECTRODE
FLOW SWITCH
(OPTIONAL)
FLOW METER
(OPTIONAL)
4-20mA
(OPTIONAL)
SPARES
Figure 2a WCT400 Conduit Wiring
POWER FEED
BLEED
PLUG
CONDUCTIVITY
ELECTRODE
FLOW SWITCH
(OPTIONAL)
FLOW METER
(OPTIONAL)
4-20mA
(OPTIONAL)
SPARES
BIO 1 ALARM
BI
O
2
Figure 2b WCT410 Conduit Wiring

9
Figure 3 Inputs
Conductivity
Electrode
Power Supply
(115 VAC or 230 VAC)
Contact Closure:
Polarity not critical
Reed Switch
Flow Meter
Polarity not Critical
IN-
FLOW MTR 1 FLOW MTR 2
IN+ IN-
FLOW SW 1
IN+
IN-IN+
+5V
BLKRED
COND
T-T+
BLEED
N.C. FEED N.O. N.C. N.O.
L2L2
L1 L2/N
Hall Effect
Flow Meter
GREEN
WHITE
GROUND
STUD
SHIELD
L1 L2/N
GRN120V
GRN/YEL240V
WHT 120V
BLU 240V
BLK120V
BRN240V
F1
F2

10
Figure 4a WCT400 Outputs
Bleed Solenoid/
Motorized Ball Valve
BLEED
N.C. FEED N.O. N.C. N.O.
P
U
MP
BLEED
N.C. FEED N.O. N.C. N.O.
L2L2
L1 L2/N
GROUND
STUD
BLK 120V
BRN 240V
WHT 120V
BLU 240V
GRN 120V
GRN/YEL 240V
IF MOTORIZED
BALL VALVE
BLK 120
BRN 240V
WHT120V
BLU240V
GRN120V
GRN/YEL240V
Chart
Recorder
NOTE: When connecting a
motorized ball valve, the pre-wired
pigtail must be removed and the
valve requires two wires, one to
N.O. to open the valve and one to
N.C. to close the valve.

11
Figure 4b WCT410 Outputs
Pump
(
s
)
Bleed Solenoid/
Motorized Ball Valve
A
larm
L1 L2/N
L2 L2 L2 L2 L2 L2
BLEED
N.C. N.O. N.C.
BOI 1
N.O.N.C.FEED N.C. BIO 2
N.O. N.C. N.O. N.O. ALARM N.C. N.O.
L2/N L2/N L2/N L2/N L2/N L2/N BLEED
N.C. N.O. N.C.
BIO 1
N.O.N.C.
FEED N.C. BIO 2
N.O. N.C. N.O. N.O. ALARM N.C. N.O.
GROUND
STUD
WHT 120V BLU 240V
GRN 120V
GRN/YEL 240V GRN 120V
GRN/YEL 240V
IF MOTORIZED
BALL VALVE
BLK 120V
BRN 240V BLK 120V BRN 240V
Chart
Recorder
BLK 120V
BRN 240V
WHT 120V BLU 240V WHT 120V BLU 240V WHT 120V BLU 240V
GRN 120V
GRN/YEL 240V
TO GROUND STUD
GRN 120V
GRN/YEL 240V
TO GROUND
STUD
GRN 120V
GRN/YEL 240V
TO GROUND
STUD
NOTE: When connecting a
motorized ball valve, the pre-wired
pigtail must be removed and the
valve requires two wires, one to
N.O. to open the valve and one to
N.C. to close the valve.

12
4.0 FUNCTION OVERVIEW
4.1 Front Panel
Figure 5 Front Panel
4.2 Display
A summary screen is displayed while the WCT controller is on. This display shows a bar graph of the
conductivity relative to the set point, the actual conductivity value, and current operating conditions.
The center of the bar graph is at the (S), which represents the set point. For each 1% rise above the set
point a vertical bar appears to the right of the (S). For each 1% drop below the set point a vertical bar
appears to the left of the (S). There are small breaks in the bars at each 5%. The bar graph is limited to
displaying 20% above or below the set point. When these limits are reached an (L) or (H) may appear at
the end of the bar graph to indicate a low or high alarm. The operating conditions that are displayed on
the bottom line of this display are Bleed, Chem Feed, Cond Hi/Lo Alarm, Sampling, Waiting, No Flow,
Biocide Pre Bleed, Bleed Timeout, Biocide Add, Biocide Lockout, Sensor Error, Temperature Error,
and Normal. Normal just means there is nothing unusual to report.
Figure 6 Summary Screen
Normal 1546
Normal 1728
Normal 2010
S
S
S
L
Cooling Tower Controller
On/Off Power Switch
Backlit LCD Display
Output LEDs
(WCT400 only has
Bleed and Feed LEDs)
Setting Adjustment Keys
Menu/Function Keys
USB Connector
USB LED

13
4.3 Keypad
The keypad consists of 4 directional arrow keys and 4 function keys. The arrows are used to move the
adjustment cursor and change settings, while the function keys are used to enter values, and navigate the
various menu screens. The function keys are ENTER, EXIT, NEXT, and PREV (previous). NEXT and
PREV scroll through the various menu choices. ENTER is used to enter a submenu and to enter a
value. EXIT is used to back up one menu level. If you are at the main menu level, EXIT will return you
to the Summary Display.
To change a value in a submenu, the left/right arrow keys move the cursor left and right to each digit or
option that can be changed. The up/down arrows will change numeric values up or down, or scroll
through option choices. Press ENTER only when you have finished making all of the changes for that
menu screen.
4.4 Access Code
The WCT series controller is shipped with the access code disabled. If you wish to enable it, see
Section 5.11 for operation. With the access code enabled, any user can view parameter settings, but not
change them. Note that this provides protection only against casual tampering. Use a lock on the cover
latch if you need more protection.
4.5 Startup
Initial Startup
After having mounted the enclosure and wired the unit, the controller is ready to be started.
Plug in the controller and turn on the power switch to supply power to the unit. The display will briefly
show the WCT model number and then revert to the normal summary display. Scroll through the menus
and calibrate the conductivity reading, temperature, and set the control parameters detailed in Section 5,
Operation.
To return to the summary display, press the EXIT key until you return to this screen. The controller will
automatically return to this screen after 10 minutes.
Normal Startup
Startup is a simple process once your set points are in memory. Simply check your supply of chemicals,
turn on the controller, calibrate it if necessary and it will start controlling.
4.6 Shut Down
To shut the WCT controller down, simply turn off the power. Programming remains in memory.

14
5.0 OPERATION
These units control continuously while power is applied. Programming is accomplished via the local
keypad and display.
To view the top level menu, press any key. The menu structure is grouped by inputs and outputs. Each
input has its own menu for calibration and unit selection as needed. Each output has its own setup menu
including set points, timer values and operating modes as needed. After ten minutes of inactivity in the
menu, the display will return to the summary display. Keep in mind that even while browsing through
menus, the unit is still controlling.
5.1 Main Menu
The exact configuration of your WCT controller determines which menus are available as you scroll
through the settings. Certain menus are only available on the WCT410 controller, and others will
change if you select certain options. All settings are grouped under the following main menu items.
Conductivity
Temperature
Bleed
Feed
WM1
WM2
Bio 1 WCT410 Only
Bio 2 WCT410 Only
Time
Alarm
4-20mA Only if 4-20mA option installed
Access Code
Datalog Only if advanced USB feature is in model code
Config Only if advanced USB feature is in model code
Upgrade
The NEXT key travels forward through this list while the PREV key travels backwards through the list.
Pressing ENTER will Enter the lower level menu that is currently displayed.

15
Figure 7 Main Menu
2000 S 67°F

Conductivity 2000 S 67°F

Temperature 2000 S 67°F

Bleed OFF 2000 S 67°F

Feed OFF 2000 S 67°F
WM1 0 GAL

Main Menu
Possible status screens
Press Enter key to enter menu. Press Exit key to exit menu. Blinking fields may be edited with the adjust arrows. Press Enter when modification is complete to return to Main Menu Level.
ENTEREXIT
Legend Operation
2000 S 67°F

Bio 1 OFF 2000 S 67°F

Bio 2 OFF 2000 S 67°F

Time: Sun 3:00 2000 S 67°F

Cnd Alrm Lo Alrm 2000 S 67°F
4-20mA 4.0 mA

2000 S 67°F Access Code DIS

Temp Error Sensor Error* No Flow
Bleed Timeout*
Cond Hi/Lo Alarm Biocide Lockout*
Biocide Add*
Biocide Pre Bleed
Bleed
Chem Feed
Waiting Sampling Normal
* Stops conductivity control
Menu only appears when 4-20 mA hardware is installed.
S
2000
Normal
L
Trips diagnostic alarm relay in WCT410 model
Menu only appears in WCT410 model.
2000 S 67°F

Datalog 2000 S 67°F

Config 2000 S 67°F

Upgrade
2000 S 67°F WM2 0 GAL

11
1
2
2

16
5.2 Conductivity Menu
The conductivity menu provides the following settings: Calibration, Self Test, Unit selection, and
sampling mode setup. Additional settings are also discussed below. Refer to figure 8, Conductivity
Menu Chart.
Calibrate To Calibrate the conductivity, use either a hand held meter, or a buffer solution, and adjust the WCT controller to
match. Once Calibrate is entered, the unit continuously displays conductivity readings. Press an arrow key to change
the value displayed to match the hand held meter or the buffer solution. You must press ENTER to activate the new
calibration. You must press the EXIT key to exit calibration. The Bleed output is unaffected until the calibration
menu is exited, so if it was ON when you entered calibration it will stay on until you exit.
Self Test Press ENTER to begin self test. Press any key to stop. Self Test internally simulates a conductivity sensor and
should always give the reading 1000 µS/cm ± 100 µS. If it does not, there is a problem with the electronics and unit
should be serviced. If the self-test is in the expected range, and there is a problem calibrating, then the sensor or its
wiring is at fault.
Units You may choose to display conductivity in µS/cm or in ppm. Press ENTER and then use the Up and Down arrows
to change the units. If you change the units, you will be warned to check your settings. This is important. Set points
are not automatically translated from µS/cm to ppm. If you change the units you will need to change your Bleed
settings.
ppm C.F. This is the ppm Conversion Factor (or multiplier). This is typically 0.666 but can be changed to accommodate
various requirements.
Sample
Mode C / I
Press enter to choose Continuous sampling or Intermittent sampling. A 'C' at the end of the display means that
sampling is continuous, while an 'I' indicates intermittent sampling. Use Continuous sampling with a traditional
bypass line installation of the conductivity sensor.
Choose Intermittent sampling to use the bleed solenoid valve for timed sampling of the conductivity.
Intermittent sampling installations read the conductivity at set intervals for a given sample duration. If the
conductivity is above the set point, the valve that controls the sampling will stay open until the conductivity falls
below the set point. If the time the valve stays open goes beyond the sample duration, the controller will display
Xtnd on the top status line, as well as the amount of time extended. A limit on this amount of time may be
imposed; see Figure 10 Bleed Menu.
Continuous
Intermittent
If Intermittent sampling is chosen, the Flow Switch input will be ignored, and the following two settings will
become available:
Interval This sets the amount of time between samples. This is set in Hours:Minutes.
Duration This is the length of each sample. This is set in Minutes:Seconds.
RawCond This menu is for information only and displays the temperature-compensated conductivity reading before the user’s
calibration has been applied.

17
Figure 8 Conductivity Menu
Calibrate
S 2000

Self Test
Cond 1000 S

Self Test
Cond 666 ppm
Units S/cm
S


Units ppm
ppm
Sample Mode C
Continuous
Sample Mode I
Intermittent
. . . . WARNING . . . .
Adjust Set Point
Cond 1000µS
Calibrate
2000 S 68° F
Conductivity

Cond 1000µS
Self Test Cond 1000µS
Units S/cm

Cond 1000µS
ppm C.F. 0.666 Cond 1000µS
Sample Mode C
Cond 1000µS
Interval (H) 3:59 Cond 1000µS
Duration 2:00
Cond Wait 23:50
Cond Samp 10:00
Cond Xtnd 10:00
Conductivity Menu
P
oss
ibl
e status screens
Menu choices that appear when ppm units are
selected. Press Enter key to enter menu.
Press Exit key to exit menu.
Blinking fields may be edited with the adjust arrows.
Press Enter when modification is complete to return
to Conductivit
y
Menu Level.
Menu choices that appear when intermittent
sampling is selected.
NEXTPREV.
Calibrate
ppm 1333
ENTEREXIT
ENTER
EXIT ENTER
EXIT ENTER
EXIT ENTER
EXIT
Legend Operation
Cond 1000µS
RawCond 2000µS
1
1112
2 2
2
1