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1.0 INTRODUCTION
The Walchem WBL Series controllers offer conductivity control of boiler water and control of chemical
feed. The WBL400 series controller has one feed/auxiliary relay available. The WBL410 series
controller has four feed/auxiliary relays. The chemical feed pump may be selected to operate in one of
the following modes:
Feed and Blowdown
Feed and Blowdown with Lockout
Feed as a percent of Blowdown
Feed as a percent of Time
Feed based on a Water Contactor input
Feed based on a Paddlewheel Water meter input
The WBL series boiler controller is supplied with a temperature compensated stainless steel electrode
with a cell constant of 1.0. The controller is a microprocessor driven industrial type with on/off control
outputs. Timed sample or continuous modes may be selected. 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.
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
months readings and events to a USB flash disk.
