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During initial powering of the XFM transducer, the flow output signal will be indi-

cating a higher than usual output. This is an indication that the XFM transducer

has not yet attained its minimum operating temperature. This condition will auto-

matically cancel within a few minutes and the transducer should eventually indi-

cate zero.

For the XFM transducer with LCD option: If the LCD diagnostic is activated, the

second line of the LCD will display the time remaining until the end of the warm

up period (Minutes:Seconds format) and will alternatively switch to Totalizer read-

ing indication every 2 seconds.

Figure b-5: XFM Main Screen during Sensor Warm up period.

5.2 Swamping Condition

If a flow of more than 10% above the maximum flow rate of the Mass Flow Meter

is taking place, a condition known as "swamping" may occur. Readings of a

"swamped" meter cannot be assumed to be either accurate or linear. Flow must

be restored to below 110% of maximum meter range. Once flow rates are lowered

to within calibrated range, the swamping condition will end. Operation of the meter

above 110% of maximum calibrated flow may increase recovery time.

Note: Allow the Digital Mass Flow Meter to warm-up for a MINIMUM

of 6 minutes.

Note: During the first 6 minutes of the initial powering of the XFM

transducer, the status LED will emit CONSTANT AMBER light.

Note: After 6 minutes of the initial powering of the XFM transducer,

the status LED will emit a constant GREEN light (normal operation,

ready to measure). For XFM with LCD option, the screen will reflect

flow and totalizer reading. (see Figure b-4).

F: 50.0 L/min

** WarmUp 2:39 **

Aalborg XFM Series User Manual

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