Installation and Operating Guide
Smart
® Desiccator
Copyright 2017 Terra Universal Inc. All rights reserved. • Revised August 2020 • Document No. 1800-16
Terra Universal, Inc. • TerraUniversal.com • 800 S. Raymond Ave. • Fullerton, CA 92831 • TEL: (714) 578-6000 • FAX: (714) 578-6020
3
3.0
Set-Up and Operation
Do not position the desiccator so that the power supply connections are inaccessible. The power supply
serves as the main disconnect for the system.
CAUTION
To prevent dangerously low oxygen levels and risk of asphyxiation, nitrogen-purged systems should only
be installed in a well-ventilated area.
WARNING
Follow these steps to prepare your Smart® Desiccator for operation using the factory-set parameters summarized
below. To change any of these values, refer to Section 4.0: Changing Set-Up Mode Parameters.
Relative Humidity Offset:
allows the user to offset the relative humidity readings to match %RH values displayed by
a test instrument. This is effectively a calibration procedure.
High Relative Humidity Alarm (default = 60
seconds):
allows the user to change the time
delay between when the measured relative
humidity level climbs above the set point value and
when the “RH High” alarm is displayed.
Identification Parameter (default = 0):
not used
with the Smart® Desiccator.
Purge-Off Delay (default = 5 seconds):
allows
the user to change the delay between the time
when the system regains the humidity set point and
the high-flow purge is de-activated. This delay
ensures that ample purge is provided to remove
moisture and contaminants from the chamber. The
longer the delay, the more nitrogen is consumed
each time a humidity fluctuation triggers the high-
flow purge.
1.
Connect a ¼” nitrogen gas (or other process gas) supply line externally regulated at 10 – 20 PSI. See photo for
fitting location. Higher pressure may result in periodic pressure release at the door seal. This gas release is
normal and necessary to prevent overpressure to the cabinet. It does NOT indicate defective or failed seals.
Once gas is released, the door seal returns to its original position.
2.
Connect the 12VDC power supply to a standard 110VAC/60Hz power outlet and then connect it to the power
input on the Smart® Desiccator (next to the nitrogen gas connection).
3.
RH Set Point (Factory Setting: 10% RH) –
The RH set point is established during normal run mode. With the
power ON, press and release Button A to view current set point. Then press Button A again to increase the set
point, or Button B to decrease it.
Gas Connection
12 VDC Power Connection
Gas Release
(RB Valve)
Button A
Button B
