Perma Pure MDH- Series User Manual

PRINCIPLE OF OPERATION
Perma Pure's heated MDH-Series gas dryers
were specifically created to dry gas samples with
dew points higher than ambient temperature
without requiring separate heating elements or
insulation. Proprietary Nafion technology selec-
tively removes only water from sample gases,
leaving the rest of the gas sample unaffected.
Unlike chillers and condensers, Perma Pure's
MDH dryers remove water directly from the vapor
phase, preventing the loss of water-soluble gases
through dissolution in condensate.
Designed to handle gas flows of up to 1.5 lpm,
the heated MDH-Series gas dryers can dry gases
with as much as 30% water by volume. The
compact design can be incorporated easily into
analyzer cabinets or used as a stand-alone
device. The dryers are currently available for use
with 110 VAC. and 12 VDC power sources.
MDH™-Series gas dryer units consist of a Perma
Pure MD-Series dryer encased in a housing with
half of the dryer heated to a constant temperature
of 80°C to prevent condensation.
The dryer consists of a single Nafion
a fluorocarbon shell. Dry purge gas flowing over
the exterior surface of the Nafion tubing continu-
ously extracts water vapor from the gas stream
inside the tubing. The driving force is the differ-
ence in water concentration on the opposite side
of the tubing wall. The purge gas then carries the
water vapor away.
®
tube within
MDH ™ - Series

Gas Dryer

User Manual

8 Executive Drive
Toms River, N.J. 08755
Phone: 732/244-0010
Fax: 732/244-8140
e-mail: info@permapure.com
Web Site: www.permapure.com
PERMA PURE