WDP410/420/440 | pH/ORP Controllers
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An Iwaki America Company WDP410/420/440 | pH/ORP Controllers OVERVIEW The WDP410/420/440 Series Dual Input pH/ORP on-line process controllers are designed for a broad range of industrial, commercial, and municipal water treatment applications. WDP controllers are easily configured to accurately measure pH or mV (ORP) values from Walchem’s WEL and WDS differential combination electrodes, or any conventional combination electrode. A versatile output configuration allows you to program up to four outputs in a variety of control modes. Select from on/off mechanical relays or pulse proportional control for direct connection to metering pumps. The easy-to-use menu format and pre-wired, pre-mounted panel system options make set-up and installation quick and simple. Integrated datalogging is available to validate system performance. A USB memory stick is all that’s needed to extract data and event logs that include electrode measurements, temperature and relay status. Download log files from the USB stick to a PC at your convenience. It couldn’t be easier! SUMMARY OF KEY BENEFITS Dual Input Reduces Cost Dual pH or ORP electrode inputs allow one controller to take the place of two, reducing cost and space requirements, and simplifying installation. $ Applications Wastewater Plating Cooling Tower Versatility for a Broad Range of Applications Select from pH or ORP measurements and from five output options. Use In-Range to control a solenoid valve to dump a batch treatment tank when measurement value is within limits, or program for Out-of-Range Alarm in waste treatment applications when the measurement value is too high or low. Ideal for Harsh Environments The NEMA 4X enclosure, combined with Walchem’s WEL and WDS electrodes, provides a waterproof system with no BNC connectors exposed to wet or corrosive environments. Built-in Safety Features Programmable output limit timers prevent run-away chemical addition. Digital Interlock Input may be used from a flow switch or level input to prevent chemical addition based on a stagnant sample, or control of an empty batch tank. TA DA Simple, Integrated Data Collection Download stored data from the controller to a USB stick with the press of a button. Use the data to simply and easily validate system performance, document compliance, and reduce liability. The data and event logs show pH/ORP and temperature values, as well as accumulated chemical feed and relay activation times.

WDP410 Series 4 powered relay outputs configurable for on/off control, alarms or automatic probe wash and 1 powered dedicated diagnostic alarm relay pH/ORP Controlle r pH/ORP Controller WDP420 Series 2 pulse proportional control outputs, 2 dry contact relay outputs for on/off, alarm or automatic probe wash and 1 dedicated dry contact alarm relay WDP440 Series 4 pulse proportional control outputs, and 1 dedicated dry contact diagnostic alarm relay AC POWER FLOW OUT FLOW IN ACID BASE BASE ACID SUBMERSION ELECTRODE SUBMERSION ELECTRODE pH PROBE WDP410/420/440 Series | Standard Features pH or...

Temperature compensation Interlock (optional): Isolated, dry contact closure required (i.e. flow, level, etc.) Measurement Performance Accuracy (calibrated) Temperature Range WEL pH/ORP Electrode (optional) Electrode body Electrode reference 1" NPTM pipe submersion connection 3/4" threaded NPTF tee in-line connection Powered Relays Pulse Outputs Internally powered relays switching line voltage All relays are fused together as one group, total current for this group must not exceed 6A Opto-isolated, Solid state relay Dry contact relays 6 A (resistive), 1/8 HP Dry contact relays are not fuse...

ORDER INFORMATION control voltage output options USB CONTROL OUTPUTS 1 = 4 On/Off relays & 1 powered dedicated alarm relay 2 = 2 pulse proportional outputs & 2 on/off dry contact relays & 1 dry contact dedicated alarm 4 = 4 pulse proportional outputs & 1 dry contact dedicated alarm cables for E Class pumps (WPH420/440) 5 = Hardwired, cable glands 4 = Single isolated 4-20 mA output 2 = 2 WEL submersion style flat pH electrodes (without auto temp comp) 2 WEL submersion style ORP electrode 1 WEL submersion style flat pH electrode (without auto temp comp) & 1 WEL submersion ORP electrode 1 WEL...