WCT

OverviewWCT Series controllers maintain cooling tower water at correct con-ductivity by automatically bleeding water at high solids levels andadding low conductivity make-up water. The WCT Series models are low cost, microprocessor-based, menudriven industrial controllers. Exceptionally versatile, units are easilycustomized on site. This series offers models as simple bleed-and-feed controllers to unitsincluding fully programable 28-day dual biocide additions, lockouttimer and flow switch. Intermittent sampling is available to facilitateinexpensive installation costs on small towers.WCT SeriesCooling TowerControllersSummary of BenefitsSimultaneous control of chemical feed inhibits corrosion,solids precipitation, and scale build up. Automatic addition of biocide prevents growth of algae ordangerous bacteria.Four methods of chemical feed are available via the programmenu, without mechanical switches, rewiring, or probinginside the instrument. One unit takes the place of four separate models, andaddresses applications from the typical to the unusual.WCT300 SeriesFeed & Bleed Cooling Tower Controller The WCT310 Series offers all of the WCT300 features as well as:Programmable biocide additions:Choice of 1, 7, 14, or 28-day cycles.Able to: add a single biocide at any time ordual alternating biocides ordual independent biocidesAlso able to add a biocide up to 10 times a day. Ideal forbromination or towers with small volumes and large makeupdemand.Lockout timer. Prevents waste of chemistry by preventingblowdown immediately after a biocide addition.Flow totalizer. If feeding is based on water meter/contactor,the volume of make-up water will be totalized. Especiallyimportant if the flow meter is inaccessible.Conductivity based biocide prebleeds. Ensure acceptableconductivity level prior to a biocide addition and lockout andis user programmable.Powered alarm output relay. Triggered by low conductivity,high conductivity or no flow condition, the relay will activatewhatever alarm device has been installed.Extended CapabilitiesConductivity electrodes are available in several mountingstyles and pressure ratings.Optional isolated 4-20mA output proportional to the conductivityreading.Optional integral flow switch.Accessories include flow meters, flow switches, solenoidvalves, chart recorders, pumps and tanks.Four chemical feed optionsFeed & bleed, with or without feed lockout timerFeed after bleed has finished, as a percentage of timeFeed as a percentage of time elapsedFeed as a percentage of make-up waterContact divider accumulates up to 100 pulses.Accomodates a wide range of water meters.Timed sample conductivity control. Intermittent samplingreduces installation costs on evaporative cooler applicationsor small cooling towers.At-a-glance status display. Best of both worlds; brightbacklit digital LCD display also acts as an analog bar graphfor a continuous visual summary of measurement versus setpoint.Direct or inverse set point operation. For applications thatrequire reverse set point capability, such as a closed loopchilled water cooler. Programmed via easy menu option,direction is indicated at all times on controller parameter dis-plays.Self-Diagnostics. Software, electronics and sensor are con-stantly monitored without having to take the controller offline. Any error messages are displayed.Programmable access code. Secures set point parameters.Program any four digit access number or disable the coderequirement.Choice of output modes. Each output may be set to runautomatically or manually, or be shut off.WCT310 SeriesFeed & Bleed Cooling Tower Controller with Biocide AdditionsConductivity Range 0-10,000 µS/cmResolution 1 µSAccuracy 10-10,000 µS/cm ±1% of reading0-10 µS/cm ±20% of readingTemperature Range 32 to 158°F ( 0 to 70°C)ResolutionAccuracy0.1 degree±1% of readingMEASUREMENT PERFORMANCEEnclosure FiberglassNEMA rating NEMA 4X (IP65)Display 2 x 16 character backlit liquid crystalAmbient temperature 32 to 158°F (0 to 70°C)Shipping weight 7 lbs (3 kg) (approximately)MECHANICAL (controller)INPUTSPower 110-120 VAC 220-240 VAC50/60 Hz, 60mA 50/60 Hz, 30mASignals Flow meter- isolated, dry contact closure required (relay, reed switch or Hall Effect) 0 - 300 HzFlow switch- isolated, dry contact closure required (reed switch) 0 -10 HzOUTPUTSMechanical @ 120 VAC, 10A resistive, 1/8 HPrelays @ 240 VAC, 6A resistive, 1/8 HPFor WCT300: Two powered relays (bleed & feed)For WCT310: Five powered relays (bleed, feed, dual biocide & diagnostic alarm)4-20mA Fully isolated, internally powered 600?(Optional) max. resistive load. Resolution 0.001% of span, accuracy ± 1% of readingStandard:Process connections 3/4” NPTFTemperature 140°F (60°C)Pressure 150 psi up to 100°F50 psi at 140°FHigh Pressure:Materials of constructionStandard electrode GFRPP, Graphite, FKMHigh pressure electrode 316SS, PVDFFlow switch manifold GFRPP, PVC, Isoplast, FKMPP/Stainless steel electrode GFRPP, 316SS, FKMHigh pressure manifold Carbon steel, SteelFLOW SWITCH MANIFOLD & SENSORSPECIFICATIONSSpecificationsMETERINGPUMPSHEATEXCHANGERCIRCULATINGPUMPSOLENOIDVALVECOOLING TOWERWATERMETERWCTTypical Installation3/4” NPTFLOWFlow SwitchElectrodeSample Valve1/4” PolyPro PanelFLOW10” (254mm)17” (432mm)Ordering Information(Voltage) (Output) (Sensor)WCT300 - or WCT310 VOLTAGE1 = 120 VAC, prewired 4 = 120 VAC, conduit5 = 240 VAC, conduitOUTPUTN = No data output4 = Isolated 4-20 mA outputSENSORN = No electrode1 = PP/Graphite electrode & tee, 20ft. (6.1m) cable(for in-line or submersion mounting)2 = PP/Graphite electrode & flow switch manifoldmounted on PP panel, 5 ft. (1.5m) cable4 = High pressure electrode (up to 300 psi), 20 ft. (6.1m) cable5 = High pressure electrode & flow switch manifold on PP panel, 5 ft. (1.5m) cable6= PP/SS electrode & tee, 20 ft. (6.1m) cable7= PP/SS electrode & flow switch manifold onPP panel, 5 ft. (1.5m) cableWalchem designs and manufactures an integratedline of analytical control,sensing and feed devices. Our in-house engineering isdriven by quality, technologyand innovation. For more information on theentire Walchem product line,visit : www.walchem.comWalchem Corporation Five Boynton Road Hopping Brook Park Holliston, MA 01746 USA www.walchem.com Phone: 508-429-1110 Fax: 508-429-7433P/N 180159.E 3/2006AGENCY CERTIFICATIONSUL ANSI/UL 61010-1:2004, 2nd Edition*CAN/CSA C22,2 No.61010-1:2004 2nd Edition*CE Safety EN 61010-1 2nd Edition (2001)*CE EMC EN 61326 :1998 Annex A*Note: For EN61000-4-6,-3 the controller met performance criteria B.*Equipment suitable for use in establishments other than domestic, andthose directly connected to a low voltage (100-240 VAC) power supply network which supplies buildings used for domestic purposes.WEBMASTER GENERALINDUSTRIAL CONTROLLERWEBMASTER COOLING TOWERAND BOILER CONTROLLERMETERING PUMPS ANDACCESSORIESWEBALERT REMOTEMONITORING & DATALOGGING