SnowPure Electropure EXL Series, Руководство по проектированию OEM, Страница: 57 / 81

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
SNOWPURE, LLC, 2005-2018 VERSION 3.5 (XL+EXL)
–FEBRUARY 2018
PAGE 57
Electrical Safety
EDI works by applying a DC voltage across a set of conductive, aqueous streams.
Further, EDI systems are typically installed in wet areas. Because of this, electrical
safety in the design of a system is critical to prevent accidents. Note that the customer
is responsible for the safe design and installation of the system, and for the training of
the operators. SnowPure does not claim that the information below alone will ensure
electrical safety.
Key system design reminders:

Ease of access to all plumbing and electrical connections should be considered
when designing the system and prior to installation.

Electrical installation should be done by qualified, trained electricians. Installation
should be to local code.

Proper grounding of the power supply and module is important. Ground fault
interruption (GFI) circuits may be used, but can be unreliable with DC power
supplies.

Grounding should be tested on-site after installation & during operation to be sure no
voltage is present at any metal surface.

Feed and concentrate streams contain ions, are conductive, and will carry current.
These need to be grounded via the installation of a conductive material directly in the
stream, grounded typically through a “tee” fitting.

Proper training and proper hazard warnings should be posted at the installation, and
on all finished equipment.
Chemical Safety
The electrochemical reactions at the anode and cathode will produce gases under
normal conditions. The oxidation at the anode produces acid, O
2
(gas), and Cl
2
, and
generates electrons. The reduction at the cathode produces hydroxyls and H
2
(gas),
and uses electrons. The chlorine is totally soluble in the water, and the H
2
and O
2
form
gas bubbles.
Primary Anode Reaction: OH
-
= ¼ O
2
(g) + ½ H
2
O + e
-
Minor Anode Reaction: Cl
-
= ½ Cl
2
(dis) + e
-
Primary Cathode Reaction: H
+
+ e
-
= ½ H
2
(g)
Gas bubbles will be present in the electrode waste stream. Venting of this stream is
required to safely dispose of these gases according to local code. There will be up to 11
ml/minute of gas (H
2
+O
2
) evolved per Ampere
based on Faraday’s Law.
Chapter 13: Safety