Shut Down; Operation; Main Menu - Walchem WDP420 Instruction Manual

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 controller down, simply turn off the power. Programming remains in memory.
The electrode must be stored with the measuring surfaces wet. If an extended shutdown will result in the
electrode dehydrating, it must be removed from its position in the process and stored in pH 4 buffer
solution.
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, direction of control, etc. 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 WPH controller determines which menus are available as you scroll
through the settings. Certain menus are only available if you purchase certain options. All settings are
grouped under the following main menu items.
Sensor
Temperature
Control 1
Control 2
Control 3
Control 4
Interlock A
Time
4-20mA 1
4-20mA 2
Access Code
Datalog
Config
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.
Sensor A and Sensor B menus appear if the 2
(WDP models)
Temperature A and Temperature B menus appear if the 2
is installed (WDP models)
nd
Only appears if the 2 sensor input card is installed (WDP models)
Only if 4-20mA option installed
Only if 2nd 4-20mA option installed
Only if advanced USB feature is in model code
Only if advanced USB feature is in model code
20
nd
sensor input card is installed
nd
sensor input card