Barnstead D4631 120 VAC Operation Manual - page 11

1 1

Barnstead |Thermolyne • 800-553-0039

Filling Procedure

CAUTION

Do not run the pump dry; dry running will damage the pump. Always make sure you have

an adequate volume of feedwater.

After every cartridge exchange, some air will be trapped in the system. Air should be purged before

routine use, by the following procedure.

A. Place a container or suitable drain under the drawoff block.

B. Open all inlet valves and the drawoff valve (handle in vertical position).

C. Plug the unit into the electrical service.

D. Place Power Switch to the "ON" position.

E. When there is a steady flow from the drawoff valve, close drawoff valve.

F. Check all fittings for leaks and tighten as necessary.

G. Install the final filter into the drawoff valve as follows:

1. Tape 11/2 - 2 turns Teflon tape around threaded portion of filter.

2. Carefully screw final filter into drawoff valve. Hold drawoff valve to prevent it from turning.

CAUTION

Do not tighten filter with a wrench. Tight connections can be made by hand.

H. Allow the pump to recirculate water before withdrawing any water from the unit. During this

recirculation, the digital display will register a gradual improvement of water quality indicating that the

ion exchange cartridges are functioning properly. After desired resistivity is reached, open the drawoff

valve and discard about two liters (1/2 gallon) of water into a container to rinse the filter.

E-pure

®

 is ready to deliver Type 1 reagent grade water.

Normal Operation

It is recommended that the pump be left operating during the normal workday to eliminate the need of

rinsing the unit up to purity each time product water is required from the unit.

Resistivity Meter

The resistivity measurement in the E-pure

®

 is accomplished with an in-line digital read-out meter and

integral cell. The resistivity meter measures the specific resistance of the water on a scale of 0.1 to 18.3

MEGOHM-cm. The resistivity measurement is automatically temperature compensated to 25ºC regardless

of system water temperature.