27
Slower response than specifi ed.
M Series meters feature a programmable Geometric Running Average (GRA). Depending on the full
scale range of the meter, it may have the GRA set to enhance the stability/readability of the display,
which would result in slower perceived response time. Please see “Pressure Averaging” and “Flow
Averaging” on page 15.
Jumps to zero at low fl ow.
M Series meters feature a programmable zero deadband. The factory setting is usually 0.5% of full
scale. This can be adjusted between NONE and 3.2% of full scale. See “Display Zero Deadband” on
page 15.
Discrepancies between old and new units.
Please see “Standard Gas Data Tables” explanation on page 23.
Maintenance and Recalibration
General: M Series Flow Meters require minimal maintenance. They have no moving parts. The single
most important thing that affects the life and accuracy of these devices is the quality of the gas being
measured. The meter is designed to measure CLEAN, DRY, NON-CORROSIVE gases. A 20 micron
fi lter (50 micron for 50 LPM and up) mounted upstream of the meter is highly recommended. Moisture,
oil, and other contaminants can affect the laminar fl ow elements and/or reduce the area that is used to
calculate the fl ow rate. This directly affects the accuracy.
Recalibration: The recommended period for recalibration is once every year. Providing that the CLEAN,
DRY, and NON-CORROSIVE mantra is observed, this periodic recalibration is suffi cient. A label located
on the back of the meter lists the recalibration due date. The meter should be returned to the factory for
recalibration near the listed due date. Before calling to schedule a recalibration, please note the serial
number on the back of the meter. The Serial Number, Model Number, and Date of Manufacture are also
available on the Manufacture Data 2 screen (page 14).
Cleaning: M Series Flow Meters require no periodic cleaning. If necessary, the outside of the meter can
be cleaned with a soft dry rag. Avoid excess moisture or solvents.
For repairs, recalibrations, or recycling of this product, contact:
Alicat Scientifi c, Inc.
7641 N Business Park Drive
Tucson, Arizona 85743
USA
Ph. 520-290-6060
Fax 520-290-0109
email: info@alicatscientifi c.com
Web site: www.alicatscientifi c.com
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