Selecting Temperature/Velocity Display; Selecting The Sensor Response - Alnor 9870 Owner's Manual

This number represents the approximate percentage
of battery life remaining, and will range from less
than 0% for a low battery to something over 100%
for a short time while the "surface charge" of the
new batteries burns off.
After 5 seconds the meter will begin to display
velocity or temperature in the selected units. Units
available for display are standard feet per minute (S
fpm) and degrees Fahrenheit (°F), and standard
meters per second (S m/s) and degrees Celsius (°C),
depending on which instrument you purchased. The
units of measure cannot be changed in the field.

Selecting temperature/velocity display

The TEMP/VEL switch on the instrument allows
you to switch between the instrument's two
measuring modes. Slide the switch to the TEMP
position to read the current temperature, or to the
VEL position to read the current velocity.

Selecting the sensor response

The Model 9870 has a FAST/SLOW response
switch for setting the sensor response speed. In the
slow response mode, it displays the average
velocity measured during the past 12 seconds. This
is a running average, so the display is updated once
a second. In the fast response mode, the meter
displays the average velocity measured during the
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