Casella CEL DryCal DC-Lite flow calibrator - Manual (Page 3)

2.0 Unpacking Checklist
Your DryCal DC-Lite has been packaged with care and includes all components
necessary for operation. Please take a moment to check that you have received
the following items. If you believe you have not received a full shipment or have
any other questions, please contact Bios immediately.
Your DryCal DC-Lite Includes
• Single-Station Battery Charger
• Tubing Kit
• Additional High Flow Tubing (with DCL-MH and DCL-H only)
• Certificate of Calibration
• Instruction Manual
• Registration Card
3.0 General Description
The DryCal DC-Lite is a field-portable primary flow calibrator used for industrial
hygiene, environmental and laboratory flow measurement applications.
The DC-Lite uses patented dry piston technology and infrared sensors to obtain
volumetric flow rates quickly and accurately.
Housed in a small, sturdy case, each unit employs a variety of popular user con-
veniences such as push-button read and auto-read functions, a large alphanumeric
display, battery level indicator, 5-minute automatic shut-off and a parallel printer
port for data-logging.
4.0 Theory of Operation
The DryCal DC-Lite can be used to measure air flow rates for either a vacuum flow
source (connected to the outlet port) or a pressure flow source (connected to the
inlet port). Before a reading is initiated, or between readings, a computer-directed
valve performs a bypass function. This allows the air to pass through the DryCal
valve, bypassing the flow-measuring cell which is then able to reset.
As a reading is initiated (by pressing the Read button) the internal valve closes
and the flow source evacuates or pressurizes the air in the flow-measuring cell. The
piston rises at the rate of evacuation or pressurization. A precision encoder system
provides two finely collimated light beams with a known distance between the
beams.
After a suitable acceleration interval the piston breaks the first infrared light beams
as it passes. The flow reading is completed when the second infrared beam
3 2
1.0 DC-Lite Features
Front and Side
Back and Side
Cell Viewing Window
Charging Jack
Inlet Port
Connect tubing here for
pressure applications
Outlet Port
Connect tubing here for
suction applications
Parallel Printer Port
Reset Button