Sentry AutoVREL - Page 15

Sentry AutoVREL Flow Controller 15
1. Operation LED
 illuminated: ow within
specied limits
 o: ow not within
specied limits
2. 2 x 8 LCD display
3. ESCAPE button
4. ENTER button
5. UP and DOWN buttons
Power on Sequence
The following sequence should be
followed during initial power up
of the AutoVREL ow controller or
after power interruption.
1. Ensure the sample inlet
isolation valve is closed so that
sample is not owing.
2. Introduce power to the AutoVREL ow controller. Once powered up, the unit begins
an initialization sequence. During initialization, the display reads “VREL CAL” until
initial calibration is complete.
3. Open the sample inlet isolation valve. When ow is detected, the unit begins
automatic ow management to the preset ow rate.
Setting Flow Rate
1. The AutoVREL ow controller has two screens available during operation. The user
may toggle between these screens by pressing the ENTER button on the keypad.
a. Set point (in cc/min ) VREL % open
b. Flow Rate (actual) and VREL % open
2. Toggle through the display screens until “Set point (in cc/min ) VREL % open” is
displayed. Adjust the ow rate set point by pressing the UP or DOWN button on the
keypad until the desired ow rate is displayed. The AutoVREL ow controller actively
manages ow to the newly set position.
Set Up/Stand By
1. The AutoVREL ow controller requires very little setup, with only the following
features available:
a. Cal VREL – recalibrates VREL valve to ensure accurate ow control
b. AutoCAL Freq - sets the time between auto-calibrations in months. This can be
set from 1 to 6 months with an option to disable. Default frequency is 1 month.
 NOTE
The AutoVREL controller does not include a real time clock so the time between AutoCAL
occurrences assumes a 30-day month.
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