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slow down quickly when being moved from a higher velocity area to a

lower velocity area. It is quite common to experience situations where a

factor of 0.9 would have to be applied although this varies considerably.

For proportional balancing this does not matter but on quantitative

measurement it should be taken into consideration.

8. Uncertainty of Measurement

Due to characteristics common to all rotating vane anemometers, the

minute amount of bearing friction causes the head signal to depart from a

linear signal/velocity relationship by an insignificant amount at high

velocities but with progressively more effect below 2m/s (400 ft/mm). In

the AV30 range of instruments, means of compensation for this error is

provided in the software enabling accuracy to be maintained to within: 1

% of reading: 1 digit (with 100mm head).

WARNING; ALTERING THE CALIBRATION WILL INVALIDATE TSI

INSTRUMENTS LTD. RESPONSIBILITY FOR CALIBRATION UNDER

WARRANTY.

The unit will monitor each time the calibration is effected.

If the calibration routine is inadvertently entered then ABORT

immediately by switching the instrument OFF and then retry.

9. SERVICE AND RECALIBRATION

If a fault or the instrument's calibration is suspected, it should be returned

to TSI Instruments Ltd. for repair or recalibration to original standards. In

any event, it is good practice to have the instrument checked at least once a

year. If an instrument is not working correctly or requires recalibration,

contact your nearest A

Department on High Wycombe (01494) 459200 (International +44 1494

459200).

TSI Instruments Ltd. operates an Instrument Hire Service for the

convenience of customers having equipment repaired or recalibrated. If you

intend to take advantage of this facility please contact the Service

Department to make arrangements prior to returning your instrument.

IRFLOW INSTRUMENTS

agent or UK. Service