If continuous purging is not required, close the flowmeter. The Dual Purge System will initiate a purge only when an air
lock door is opened, or when humidity level climbs above the set point (if your system includes a NitroWatch).
11.
Operation Display Functions: After completing initial programming, press the specified button to view these operating
conditions:
High Purge Bypass – Press and hold SET
In some applications (especially using fine powders in a glove box), you may wish to deactivate the high purge
function, which could create turbulence. To do so, press DOWN while holding SET. To activate high purge, hold UP
while holding SET.
Incoming Line Pressure – Press & hold UP
(displays in PSI)
Internal Pressure – Press and hold DOWN
(displays in milli-inches of WG)
Purge Timer – Press and hold UP and DOWN
simultaneously to review the number of seconds the high-
flow purge is active after a door is closed. To change this value, see “Programming,” above.
Set-up with the Dual Purge System and NitroWatch
®
Includes: Dual Purge System as described above, NitroWatch control unit, humidity sensor, and two 5' connecting lines (for
connecting the control unit to the humidity sensor and to the Dual Purge System). Refer to illustration on page 3.
1.
Carefully unpack the unit and check for any visible damage or missing parts.
2.
Complete the Dual Purge System connections as described above.
Note:
The PURGE CONTROL connection allows the
NitroWatch to draw power from and to control the Dual Purge System.
3.
Connect the humidity sensor to the controller by plugging in the round DIN connector to the R/H SENSOR port on the rear
panel.
4.
Leave the DOOR SWITCH port on the NitroWatch open. This connection is used only in desiccator applications.
5.
Turn the Dual Purge System ON by placing the power switch in the “up” position. The NitroWatch LED display should
indicate some humidity level.
NOTE:
Allow about 5 minutes for the system to warm up after turning power “ON.”
6.
Initial NitroWatch Programming: After connecting the NitroWatch to the Dual Purge System, turn ON the Dual Purge
System while holding down the NitroWatch SET button (the left button on the front control panel).
Each time you release and then press and hold the SET button, you will advance through the following control functions.
Use the UP/DOWN buttons to change default settings (shown in parentheses):
Door
Open Door Delay Alarm: No. of seconds a door must remain open to activate OPEN DOOR alarm (default: 60).
This setting is inactive in Glove Box applications.
rH
Relative Humidity High Purge Delay Alarm: No. of seconds the RH level must remain above the set point to
activate the alarm (default: 60).
beeP
Enables/Disables Beeper Alarm (default: ON).
hU
HUMEX operation selector – when in the OFF mode, the system operates as a NitroWatch (maintaining below-
ambient humidity). In the ON mode, the system functions as a Humex2 (maintaining above-ambient humidity).
Default: OFF.
Add
ADJUST parameter: Use this function to compensate for measured discrepancies between the NitroWatch %RH
readout and that of an independent %RH calibrator. Press the UP/DOWN keys to adjust the scale up or down.
Note:
this adjustable offset value will wrap around if the maximum or minimum is exceeded. For example, if
you try to set the adjust value above the maximum scale offset of 49.5, the value will wrap around to –50. Also,
a side effect of using an offset value other than zero is that the R/H range will be reduced. For example, if the
offset value is –10, then the maximum R/H value that can occur is 90 because the input value (100) will be added
to the adjust value before the system uses it.
Alr
ALARM time selector, which allows you to specify the alarm scale determined above (“Door”) in either minutes
– LONG –or seconds – SHrt.
Quick-Start Operating Guide
Series 100 Polymer Glove Box
© Copyright 2004 Terra Universal Inc. All rights reserved.
• Revised December 2004 • Document No. 1800-42
®
®
6
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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