Chapter 2
8
Table 2: Typical battery life* at three velocities
Air Velocity
alkaline life
nickel-
cadmium life
(ft/min) (m/s) (hrs)
(hrs)
100 0.5 10
2-1/2
1000 5.0
6
1-3/4
2000 10.0
5
1-1/2
* At 20°C
The V
ELOCI
C
HECK
continually monitors its battery
supply voltage. Then the battery life falls below
15%, the battery indicator (
BAT
) in the upper left
corner of the display will blink on and off. This
indicates a low battery condition and means that the
batteries will soon need to be replaced.
♦
Once the
BAT
indicator begins to blink, you
still have a few minutes to complete the
measurements you are making. While the
indicator is blinking, the V
ELOCI
C
HECK
continues to measure accurately.
If the battery voltage falls below 3.5 VDC, the
display will read “
LO
” and the
BAT
indicator will
be on continuously. Batteries must then be
replaced before velocity readings can be taken.
