Alicat V Series Volumetric Flow Meter User Manual

Page 32

RS-232 Serial Communications is not responding.

Check that your meter is powered and connected properly. Be sure that the port on the computer to which

the meter is connected is active. Confirm that the port settings are correct per the RS-232 instructions

in this manual (Check the RS-232 communications select screen for current meter readings). Close

HyperTerminal® and reopen it. Reboot your PC.
Slower response than specified.

M and V 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 flow.

M and V 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 25.

Maintenance and Recalibration

General: M and V 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 filter (50 micron for 50 LPM and up) mounted upstream of the meter is highly recommended.

Moisture, oil, and other contaminants can affect the laminar flow elements and/or reduce the area that

is used to calculate the flow 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 sufficient. 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 and V 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 Scientific, Inc.

2045 N Forbes Blvd. Bldg.103

Tucson, Arizona 85745

USA

Ph. 520-290-6060

Fax 520-290-0109

Web site: www.alicatscientific.com