39
Maintenance and Recalibration
General:
819-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.
Moisture, oil and other contaminants can affect the laminar flow elements.
We recommend the use of in-line sintered filters to prevent large particulates
from entering the measurement head of the instrument. Suggested maximum
particulate sizes are as follows:
15 microns for units with FS flow ranges between 0-100 sccm and 0-1 slpm.
50 microns for units with FS flow ranges of 0-1 slpm or more.
Recalibration:
The recommended period for recalibration is once every year.
A label located on the back of the meter lists the most recent calibration date.
The meter should be returned to the factory for recalibration within one year
from the listed 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 Model Info display (page 21).
Cleaning:
819-Series Flow Meters require no periodic cleaning. If necessary, the
outside of the meter can be cleaned with a soft dry cloth. Avoid excess moisture
or solvents.
For repair, recalibration or recycling of this product contact:
MATHESON
166 Keystone Drive
Montgomeryville, PA 18936
Ph: 800-828-4313
Summary of Contents for 819 Series
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