5
The Range Selector with the black lettering has the following ranges:
Velocity:
0 to 1250 feet per minute
0 to 2500 feet per minute
Static Pressure:
0 to 1 inches of water (6000AP set)
The Range Selector with red lettering has the following ranges:
Velocity:
0 to 5000 feet per minute
0 to 10,000 feet per minute
Static Pressure:
0 to 10 inches of water
A take-up adjustment screw (F) is provided for tightening the switch plate
(B) which may work loose through normal wear. A noticeable effort to
change the setting of the switch plate will indicate proper tightness.
Pitot Probe
The Pitot Probe is designed to measure the velocity of air in ducts and also
in unrestricted areas such as air intakes at grinding/buffing wheels or ven-
tilation slots at plating tanks. For the procedure to measure duct velocities
see pages 13 and 14; for other applications see page 10.
The air intake (and discharge) for the probe is at (A). The probe should be
held at right angles to the air flow; an arrow at the base of the probe (C)
should point in the direction of the air flow.
The probe is marked in one-inch increments (B) for convenience in posi-
tioning the probe inside ducts.
The probe collar (D) acts as a stop when inserting the probe into the Range
Selector; an O-ring acts as a seal when the connecting leg is inserted into
the Range Selector.
Lo-Flow Probe
The Lo-Flow Probe is designed for measuring velocities below 300 feet
per minute in open spaces; it attaches directly to the meter without hoses.
An arrow (A) on the probe serves as a reminder of the direction you must
orient the probe and the meter when taking measurements.
Refer to page 10 for the proper velocity measuring procedure.
A
Velocity
Sensing Port
B
Scale
C
Air Flow
Direction
Indicator
D
Probe Collar
E
Connecting Leg
A
Air Flow Direction Indicator
