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An analog data (or control) output is provided. This is a non-isolated 4 - 20 mA signal. The conductivity
reading that corresponds to minimum and maximum analog signals is fully adjustable. This signal can be used
to power chart recorders or other pumps and devices.
The controller operates in two (2) distinct modes, ‘SYSTEM RUN’ and ‘SYSTEM START-UP’ or 'PRO-
GRAMMING MODE'. The unit will be in the ‘SYSTEM RUN’ mode when it is first turned on. The various
program screen menus are used to calibrate the unit, set the control and alarm points, set the inhibitor feed
operating parameters, program the biocide [two (2) chemical addition] pumps, and manually test the relays
and wiring connections.
In the ‘SYSTEM RUN’ mode the DC4500 monitors the conductivity and activates the appropriate control or
alarm relay as necessary based on the set points entered in the ‘SYSTEM START-UP’ mode.
The DC4500 is packaged in a NEMA 12X, flame-retardant, molded TPE enclosure. When ordered, 115 VAC
units come fully wired to include input power cord and relay output pigtails to allow for simple installation.
The unit can be hardwired through conduit to the lower junction box portion of the enclosure when required.
Hard wiring makes the unit suitable for NEMA 4X applications.
2.0 Installation
2.1 Mounting the Controller Enclosure
The DC4500 conductivity controller is supplied with integral wall-mounting flanges. It should be mounted
with the display at eye level on a vibration free surface. All accessible mounting holes should be utilized. The
maximum allowable temperature is 122° F [50° C]. This should be considered if installation is in a high-
temperature location. Once the DC4500 is wall mounted, the metering pumps may be located at any distance
from the controller. The conductivity probe should be placed as close to the controller as possible, to a
maximum distance of 300 ft [91 m]. Under 25 ft [7.6 m] is recommended. Over 25 ft [7.6 m], the cable may
need to be isolated or shielded from background electrical noise.
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