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TT Series LR Manual

Page 04

Auto Zero . . .

Slow4

7.7

m/s

AvgVel

4.5

Store

TT Series LR Manual

Page 04

Gauge / Duct Static

Measurement:

Orifice Plates:

Flow Grids:

Inlet Cones:

Total Head Probe:

dpm‐i Pitot Tube:

Ellipsoidal Pitot Tube: Input the Pitot Tube factor 1.000.

DISPLAY

Auto Zero . . .

Whenever the auto zero sequence is initiated manually or at preset

'Auto Zero . . .' will be displayed until the cycle is complete.

Being an auto ranging instrument, the resolution and decimal points will

change according to the pressure being applied.

Shows which mode the instrument is in.

Press the FAST SLOW key to change the mode.

Shows the unit of measurement.

Press UNITS to toggle between units of measurement.

Shows the average velocity of the readings stored.

Shows the number of readings stored.

Up to 2500 readings can be stored.

PRESSURE CONNECTIONS

Connect to Signal In. Leave Reference open to atmosphere.

Readings may be positive or negative depending on whether the system

under test is above or below atmosphere pressure.

Connect upstream tapping to Signal In and downstream tapping to Reference.

Pressure readings should always be positive.

Connect +Ve tapping to Signal In and ‐Ve tapping to Reference.

Pressure readings should always be positive.

Connect tapping to Signal In using 'T' pieces to join the annular tapping

together. Leave Reference open to atmosphere, ensuring that the open port

is shielded against significant air movement from the ingoing airstream.

Pressure readings should always be negative.

Connect to Signal In. Leave Reference open.

Readings should always be positive

Input the Pitot Tube factor 0.838.

Connect clear tubing to Signal In and black tubing to Reference.

Use UNITS to toggle to m/s or ft/min depending upon model.

Readings should always be positive.