Normal Operation; Resistivity Meter - Thermo Scientific E-pure 1090 Series User Manual

Section 6
Operation
Filling Procedure
(continued)

Normal Operation

Resistivity Meter

6-4 E-pure® Water Purification
8. 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 draw-off valve and discard about two liters (1/2
gallon) of water into a container to rinse the filter. For critical
applications such as H.P.L.C., rinse 50-100 ml of water through the
filter prior to using the water.
E-pure is ready to deliver Type 1 reagent grade water.
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.
The D2769 and D2770 are in-line digital readout meters and integral cells
that calculate the resistivity in the old E-pure models. AP3XXXJ and
290278 are AquaPro in-line readout meter and cell for new E-pure models.
The resistivity meter measures the specific resistance of the water on a scale
of 0.01 to 18.2 megohm cm. The resistivity measurement is automatically
temperature compensated to 25°C regardless of system water temperature.
Note Refer to Aquapro manual found on Thermo Scientific CD included
with Epure for the complete operation.
Thermo Scientific