To replace the filter for Closed-Loop Filtration Module:
1.
Remove screws that secure filter housing in place.
2.
Remove the housing and the used filter.
3.
Insert replacement HEPA filter (Catalog No. 2100-30) and replace housing. Secure housing with screws.
To replace filters for Open-Loop Filtration Module:
1.
Remove screws that secure the plexiglass filter housing.
2.
Discard the disposable housing (with enclosed filter).
3.
Replace with Replacement Filter Module (HEPA filter in plexiglass housing, Catalog No. 1684-84), and secure housing
with screws.
Testing and Replacing Humidity Sensor
The NitroWatch humidity sensor requires no calibration. If a discrepancy is observed between the displayed %RH and that of an
independent humidity calibrator, the humidity scale can be shifted accordingly (see NitroWatch Set-Up guidelines above). The
sensor should be tested periodically and replaced as necessary (about every 5 years under normal use).
6.0 Troubleshooting
Terra Universal's Glove Boxes and Nitrogen Controls are designed to provide years of reliable, efficient service. If you should
experience any problems that arise during operation of your system, refer to the appropriate troubleshooting procedure below. If
the problem persists, or if you encounter any problems not described below, call Terra Universal for additional assistance.
PROBLEM:
System won’t turn on.
POSSIBLE SOLUTIONS:
1.
Make sure that the power cord of the Dual Purge System is plugged into an appropriate outlet and that the telephone cable
to the NitroWatch is properly connected.
2.
Make sure that the power switch of the Dual Purge System is in the ON position.
3.
Check the fuse of the Dual Purge System. The 1/2 amp fuse, mounted on the circuit board controller, is accessible once
the stainless steel housing cover is removed.
PROBLEM:
System stays in high purge at all times.
POSSIBLE SOLUTIONS:
1.
Make sure that you have programmed the Dual Purge for Glove Box service, and that the internal pressure setting is
between 0.2 and 0.7 inches water gauge.
2.
If your system incorporates a NitroWatch and you require a very low humidity level, you may need to increase the
flowmeter setting on the Dual Purge System to provide more than 0.1" WC internal pressure.
You should increase the flowmeter setting until the system maintains a humidity level a few percent below the humidity
set point without switching to the high-level purge. Remember, though, that the Dual Purge System should be able to
maintain the humidity level you require with a low-level purge as long as access doors remain closed.
3.
Check door seals of the air lock to make sure that there are no leaks.
4.
If you are operating a large glove box and require a low humidity level, your system may need to operate on high purge
much of the time to compensate for the hygroscopic characteristics of the plexiglass (or static-dissipative PVC) chamber
walls. These materials absorb moisture from outside of the wall and pass it inside. The higher the difference between the
external and internal humidity levels, the more nitrogen you will need in order to remove this moisture.
Turn up the flowmeter setting until the Dual Purge maintains the desired humidity level on low purge.
PROBLEM:
The system constantly switches between high and low purge.
POSSIBLE SOLUTIONS:
1.
Make sure that all access doors are closed. Check door seals for leaks.
2.
The flowmeter is set too low. Increase the flow and make sure you maintain at least 0.1" WC or more internal pressure.
This is especially important if your system incorporates a NitroWatch and you have established a low humidity set point.
Quick-Start Operating Guide
Series 100 Polymer Glove Box
© Copyright 2004 Terra Universal Inc. All rights reserved.
• Revised December 2004 • Document No. 1800-42
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Terra Universal, Inc. • TerraUniversal.com • 700 N. Harbor Blvd. • Anaheim, CA 92805-2553 • TEL: (714) 526-0100 • FAX: (714) 992-2179
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