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www.restek.com
11.0 Volumetric vs. mass flow measurements
The Restek ProFLOW 6000 is a volumetric flow measurement device. Volumetric flow is the measurement of
the volume of gas through a conveyance per quantity of time. Standard units of measure for this parameter
are given in mL/min. The advantage of measuring volumetric flow is its independence to the composition of
the flow gas. It is not necessary to correct the flow values based on the gas composition, as is required for mass
flow devices.
Mass flow measures the weight of the gas flowing through the instrument per quantity of time. Mass flow
units of measure are commonly g/sec.
12.0 Bubble flowmeter measurements
If you employ bubble flowmeters in your laboratory, you may find that they give slightly different flow rate
values than the Restek ProFLOW 6000. This error is due to technology limitations inherent in the bubble flow-
meter device, error from variances in air humidity within the bubble chamber, and its direct contribution to the
measured flow rate. In the event a bubble flowmeter is used to measure flow gas where the gas is at elevated
temperatures, the error due to humidity contributions can be extreme. For the most accurate measurement of
laboratory gas flow rates, we recommend using the Restek ProFLOW 6000 over bubble flowmeters.
INJECTION MOLDED
NON-FILLED
CYCOLOY - PC/ABS C6200
MANUF.: SABIC
INJECTION OVERMOLD
VERSOLLAN
INJECTION MOLDED
NON-FILLED
CYCOLOY - PC/ABS C6200
MANUF.: SABIC
INJECTION MOLDED
WHITE SILICONE
BUTTONS
13.0 Product case specifications
14.0 Calibration and service
The Restek ProFLOW 6000 comes factory calibrated and carries a one-year warranty (excluding recalibration)
from time of purchase. All units are calibrated to NIST traceable standards.
Recommended schedule for recalibration is once every year from time of purchase. Customers will need to
return the unit to Restek for recalibration. At that time, preventative maintenance services can also be per-
formed. A fee will be charged for recalibration and servicing of the unit. Prolonged failure to recalibrate the
instrument may result in increased error.
Please have the serial number available when calling Restek with any concerns you may have.
Additional charges may apply if the warranty is expired or the damage is due to misuse. This
manual is also available in electronic format at
www.restek.com
.
