Perma Pure MH-Series - Manual (Page 2)

CIRCULATION FEED METHOD
The circulation method (shown in Figure 2) requires
heated water to be continuously circulated. The flow
with greater pressure needs to be flowing inside the
tubes to prevent tubing collapse.
SIPHON FEED METHOD ROTATE TEE FITTINGS
DISASSEMBLING
Tools Needed:
- Two wrenches- 5/8 and 7/16
- Tweezers
1. Hold tee fitting with 7/16 wrench and loosen
union connector fitting with 5/8 wrench (refer
to Figure 3).
2. Remove fitting.
3. Rotate dryer element 10 degrees each way
with tweezers or fingertips.
4. With two wrenches, loosen inside nut
connecting tee fitting to shell tube.
5. Rotate tee fitting to desired location and
tighten into place.
6. Install union into tee fitting while making sure
element is not pushed back out of o-ring seal.
Take caution to ensure element does not
rotate inside shell.
7. Tighten union fitting by hand and then tighten
1/4 turn with wrench.
Tools Needed:
- Two wrenches - 5/8 and 7/16
- Pair of lightweight gloves
1. Repeat steps 1-4 for other end.
2. Put on lightweight gloves to protect membrane
tubing (skin oils can contaminate surface).
3. Gently push one end of element out of o-ring
while pulling other end out of tee fitting.
4. Gently pull element out of housing from
opposite end.
5. Reverse for reassembly.
6. Element ends should extend equally from
each end of shell housing before installing
union fittings. Soak element for 5 minutes in
DI water if it is too short.
Figure 1
In the Siphon feed setup (shown in Figure 1),
temperature at which the air will be fully saturated
(“dew point”) must be determined. The humidifier
must be heated or insulated to this temperature and
kept constant. A reservoir of de-ionized water is
pulled through to fill the shell side and cap off at the
outlet. A positive pressure sample gas is pushed
through the inner tubes and is humidified.
Figure 2
Tee Fitting
Union Fitting
O-Ring
Element
Nut
Tee Fitting
Union Fitting
O-Ring
Element
Nut
Inside Nut
Inside Nut
Figure 3