Walchem WDP420 Instruction Manual

Walchem WDP420 Instruction Manual Manual pdf 4 page image

11.0 INTRODUCTIONThe Walchem WPH Series single sensor input and WDP Series dual sensor input controllers are wallmount pH/ORP controllers that are available in on/off or modulated pulse proportional versions. Theyare available with four on/off control relays (WPH410 or WDP410) with two modulated pulseproportional output and two dry contact relays (WPH420 or WDP420) or four modulated pulseproportional outputs (WDP340). A fifth output is used as a diagnostic alarm. One or two isolated 4-20mA outputs are optional.They are compatible with any amplified electrode. The choice of pH or ORP operation is selectedthrough the keypad. Use of Antimony pH electrodes is acceptable. Automatic temperaturecompensation may be used via a Pt1000 or Pt100 input if pH operation is selected. The controller willprompt you to calibrate the electrode at the desired frequency. Automatic buffer recognition may beused in the calibration routine.Our unique USB feature provides the ability to upgrade the software in the controller to the latestversion.An advanced USB capability option is available. The Configuration file feature allows you to save allthe 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 tosave the last 2 month’s readings and events to a USB flash disk.