Casella CEL Defender 510/520 flow calibrator - Manual (Page 7)

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Measure
Once you’ve finished customizing your Defender’s SETUP and have confirmed your changes, select MEASURE to begin
a set of measurements. MEASURE gives you access to TAKE MEASUREMENTS, where you can choose between the
following flow measurement options:
• Single. A manual measurement with a running average (default is 10 measurements in the average and is
user-definable from 1 to 100).
• Cont. Continuous hands-free measurements with an on-screen running average (default is 10 measurements in
the average and is user-definable from 1 to 100).
• Burst. A stream of hands-free measurements taken in a user-definable grouping of 1 to 100 measurements.
Once completed, no more measurements are taken until another Burst is initiated.
Select the type of flow measurement you want, then press ENTER. The flow cell viewing window lights up, and the
Defender instantly begins taking flow measurements.
You can stop a series of hands-free measurements at any time by choosing either PAUSE or RESET. PAUSE terminates
the flow measurement or sequence of flow measurements but leaves the flow results on the screen, while RESET
terminates the flow measurement or sequence of flow measurements and clears the screen, allowing a new
sequence of measurements to begin.
EXIT returns you to the TAKE MEASUREMENTS screen, and SETUP allows you to further customize your
Defender’s operation.
Out of Range!
If your sampling pump is generating more flow than your Defender’s rated flow range, the “Out of Range!”
warning appears when you attempt to take a flow measurement. Immediately lower or disconnect the pump’s
flow. When the flow is within the proper range, choose RESET to clear your Defender’s last measurement, or try
to take a new measurement. You may verify your Defender’s flow range by navigating to SETUP, then About.
Reset Function
If your Defender fails to respond to push-button commands, try resetting the unit by pressing the reset button on the
back. This can be done easily with a bent paper clip. Please note that resetting your Defender will not affect your user
settings. However, if you are in the middle of a calibration, your Defender will return to the initial measurement phase
and you’ll need to initiate a new flow measurement.
Annual Maintenance and Calibration
Your Defender is engineered to provide years of reliable service, with appropriate care and maintenance. Bios recom-
mends annual calibration by an ISO 17025-accredited laboratory, such as Bios, to help ensure the best possible flow
measurements, meet regulatory requirements and provide a bulletproof audit trail in the event of litigation. If you
should encounter any problems with your Defender, immediately contact Bios Customer Service and provide a detailed
description of your situation, including the Defender model and serial number, information about the air sampling pump
and the current sample train, the environmental conditions during the test, the flow point or points that you’re checking
and a detailed explanation of the issue you’re experiencing.