Intek RheoVac DR User Manual
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SECTION 3 — OPERATION
The RheoVac DR system is compensated and linearized for a wide range of flowing medium
temperatures, pressures, and water vapor content. However, abrupt changes in these parameters can
cause the instrument to temporarily read improperly, which could lead to transient spikes in the flow
indication. In particular, if liquid (water) contacts the probe tips, there will be high flow indications until
all the water vaporizes. This is typically an infrequent occurrence and should not happen if the probe
is properly installed, according to instructions in SECTION 2 I NSTALLATION, and the vacuum
dryer is operating according to design.
Verify wiring is according to instruction in SECTION 2.4. With all power off, place the power OFF/ON
switch, SW1, to “ON.” Close and latch down the main processor enclosure lid. While watching the
main processor display, apply power to the instrument. After about twenty seconds the display should
initialize to “Health Check in Progress” followed by additional initialization status messages. Within
two minutes the display should indicate “Air Mass Flow” rate in lb/hr units.
Upon a “cold” initial start-up of the RheoVac DR system, the probe may take several minutes to give accurate
readings. During this time the probe is transitioning to thermal equilibrium conditions under vacuum.
PORTABLE USB DATA STORAGE/Warranty Registration Instructions
Intek’s warranty program is stated at the front of the manual. To validate warranty:
A. Locate portable USB Data Storage Device in the main electronics enclosure (Figure 5).
B. Grasp bracket and carefully remove portable USB Data Storage Device.
C. E-mail all RheoVac DR instrument data to techsupport@intekflow.
D. Replace portable USB Data Storage Device in the main electronics enclosure.
CAUTION - Do not attempt to use non-Intek approved USB flash drives with the RheoVac DR
instrument. Your RheoVac DR instrument may not have the proper drivers installed for other USB flash
drives. This may cause the RheoVac DR instrument to lock-up and require service.
The RheoVac DR has a 2x20 alphanumeric scroll-through display that shows seven parameters for the
probe pair. The display shows Air Mass Flow, Water Vapor Mass Flow, Total Mass Flow, Temperature,
Pressure, Relative Saturation, or Actual Volume Flow (as well as Time/Date, Software Version, Serial
Number). To change the displayed parameter, press the Scroll Up or Down arrows. The display units
can be changed from English or Metric units by pressing the Units button.
If the RheoVac DR is configured for multiple probe pairs, the display will show all the probe serial
numbers one set at a time, one for each probe pair. The numbers will be in order, from the lowest serial
number to the highest, reading from left to right on the display. Example: 11621-1, 11621-2 and 11621-3.