Casella CEL DryCal DC-Lite flow calibrator - Manual (Page 8)

charged at least once every three months.
Always store DryCal calibrators in a clean, dry environment and recharge
the unit prior to use after long-term storage.
8.7 Calibration
As a quality assurance measure, Bios recommends annual calibration of all meas-
urement instruments, although how often you have your DryCal calibrated is
an internal quality control decision. The determining factors are whether the unit
passes the internal leak-test, quality system requirements if applicable, and
the conditions in which the unit is used. Units used in a laboratory setting may
require calibration less frequently than a unit that is used in a dusty environment.
The annual calibration program is an elective and is therefore not included as
a warranty item. “As received” flow test data and expedited “48 hour” turnaround
service are also available at an additional cost. Please contact the factory for more
information on available calibration services and pricing.
Calibration Includes
• Cleaning (if required)
• Valve adjustment (if required)
• Battery capacity test
• Internal computer program upgrade as necessary
• Mechanical upgrades as necessary
• Dynamic Performance Test
• NIST-Traceable Calibration Certificate
9.0 Calibration Statement
The DC-Lite is dynamically tested by comparing it to a Laboratory Standard pri-
mary piston prover of much higher accuracy (±0.25%), but of similar operating
principles. Flow generators of ±0.01% stability (included in prover accuracy) are
used for the comparison. Use of provers of similar construction to the devices
under test assures the validity of the flow generator as a transfer standard.
The primary Laboratory Standards are qualified by direct measurement of their
dimensions (diameter, length of measured path, time base) against NIST-traceable
gauges and instruments. A rigorous analysis of their accuracy in accordance with
the International Guide to Uncertainty in Measurements has been performed,
assuring their traceable accuracy. Test procedures assure temperature matching of
the Laboratory Standards to the devices under test.
The calibration dates of the laboratory standards for each parameter (diameter,
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valve will close. Return the unit to an upright position and it will time the
descent of the piston.
3 Place the DC-Lite on a flat, vibration-free surface.
4 Observe the location of the piston to ensure that it is at the top of the cell
when the test begins (the test may take as long as 15–20 minutes). If the
test is completed successfully, the display will read: “Test OK Push Read.”
5 Push the Read button as directed and the internal valve will open
and the piston will fall.
6 Repeat the test with the leak-test tubing accessory connected to the
lower (outlet) air boss. If the unit fails the Leak-test, the display will
read: “Maintenance Reqd Push Read.”
8.3 Air Containing Particulates
As of January 1, 2001, the DryCal DC-Lite comes standard with either a 5-micron or
30-micron inlet filter inside the inlet fitting (depending on model ordered).
Additionally, all older DC-Lites sent in for calibration will be retrofitted with new
style inlet filters, free of charge. However, air containing cigarette smoke or other
excessive dust and particulates should be additionally pre-filtered. An additional
particulate filter, part AF-516, is available for this purpose. The filter should be
placed ahead of the DryCal in the flow stream, on the inlet side.
8.4 Return Authorization
Prior to returning your DryCal for repair or recalibration, please contact Bios
International for technical support, troubleshooting assistance and an RMA
number if necessary.
You can telephone Bios at (800) 663 4977 or (973) 492 8400, or send an email to
service @ biosint.com.
8.5 Shipment
When shipping the DryCal DC-Lite please ensure that the packaging is adequate
to protect the instrument. When possible the DC-Lite should be shipped in
the original packaging. Bios International Corp. is not responsible for damage that
occurs during shipment.
8.6 Long-Term Storage
DryCal calibrators can remain on charge until needed without causing damage
to the battery. If the DryCal is stored for long periods of time the battery should be
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