General Description; Meter - TSI Instruments ALNOR Velometer 6000 Series Owner's Manual

The Alnor Velometer is a direct reading instrument for measuring air ve-
locities. It is designed to measure velocities inside heating and ventilating
ducts, or in open areas such as at fume hoods, grilles, diffusers, slots on
ventilated plating tanks, and so forth. It may also be used for measuring
duct static pressures.
The Velometer set consists of the meter, velocity and static pressure Range
Selectors, measuring probes and connecting hoses.
The Velometer is basically an air flow meter reading in feet per minute (or
meters per second).
The Velometer is built with a taut band meter movement; it is carefully
balanced so that you may hold the meter in any normal position and still
get an accurate reading. All Velometers are uniformly calibrated to fac-
tory standards: optimum accuracy is attained when velometers are used with
accessories of the same set, and with the meter in the horizontal position
(scale window facing up).
Before using the Velometer, study the operational instructions and proce-
dures to insure proper use of the instrument for accurate results.
A
Range
Scales

Meter

The meter receives air through its sensing ports. A force against the vane
causes a deflection of the needle which yields an indicated reading.
On the face of the meter there is a series of range scales (A) which enables
you to read accurately the measured value. Since there are a number of
ranges, it is important that the scale read on the meter face corresponds to
the velocity or static pressure range that is set on the Range Selector.
On the back side of the meter there are two sensing ports (hose connec-
Zero
C
Adjustment
tions) (B) which are for interconnecting to one of the two Range Selectors
Screw
with hoses. One port is marked positive (+) and the other negative (–).
B
Sensing
Sensing port caps are provided and you should place them over the sens-
Ports
ing ports when the meter is not in use.
Check to see that the pointer is at zero each time the meter is put into service.
The zero adjustment screw (C) enables you to make an adjustment. With
the caps still on the ports, use a screwdriver to bring the pointer to zero. It
should continue to read zero whether the meter is lying flat, standing up-
right or is at any position in between, including the position where one end
of the scale is lower than the other.

GENERAL DESCRIPTION

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