Unpacking & Installation; Unpacking The Unit; Mounting The Electronic Enclosure; Installation - Walchem WDP420 Instruction Manual

3.0 UNPACKING & INSTALLATION
3.1

Unpacking the unit

Inspect the contents of the carton. Please notify the carrier immediately if there are any signs of damage
to the controller or its parts. Contact your distributor if any of the parts are missing. The carton should
contain: a WPH/WDP series controller and instruction manual. Any options or accessories will be
incorporated as ordered.
3.2

Mounting the electronic enclosure

The WPH/WDP series controller is supplied with mounting holes on the enclosure. It should be wall
mounted with the display at eye level, on a vibration-free surface, utilizing all four mounting holes for
maximum stability. Use M6 (1/4" diameter) fasteners that are appropriate for the substrate material of
the wall. The enclosure is NEMA 4X rated. The maximum operating ambient temperature is 122°F
(50°C); this should be considered if installation is in a high temperature location. The enclosure requires
the following clearances:
Top:
Left:
Right:
Bottom:
3.3

Installation

Once the enclosure is mounted, the metering pumps or other control devices may be located at any
distance from the controller. The electrode, once amplified, may be placed up to 1000 feet from the
controller. Shielded cable with twisted pairs is required. Always route AC voltage wiring in conduit that
is separated by 6 inches from low voltage DC signal lines (such as the electrode signal).
Electrode Installation
The WPH/WDP controllers are designed to work with most AMPLIFIED pH, ORP or ISE electrodes.
When in doubt, follow the electrode manufacturer's instructions for installation.
If you have ordered your controller with an external preamplifier pre-wired to the controller, simply
attach the electrode to the BNC connector on the preamplifier. If you are using automatic temperature
compensation, wire the ATC element to the preamplifier as shown in figure 3.
If you have ordered the external preamplifier separately, see figure 3 for wiring instructions.
NOTE: The cable between the electrode and the preamplifier is carrying an extremely sensitive high
impedance voltage signal. Never cut, splice or otherwise destroy the integrity of the cable or unstable
readings and susceptibility to electrical noise will result.
Instructions for physically mounting the electrode into the process solution will vary greatly with the
type of electrode and circumstances involved in your application. Here are some general guidelines to
assist you. Refer to figure 1, Typical Installation.
The electrode should be installed such that the measuring surfaces will always stay wet. Many
electrodes have to be installed vertically, with the measuring surfaces pointing down. Follow the
manufacturer's recommendations if this is the case. If the electrode dries out, a slow response and short
life will result.
2" (50 mm)
8" (203 mm)
4" (102 mm)
7" (178 mm)
4