Normal Operation - General HWA4214SD User Manual

NORMAL OPERATION

1. To prepare to make measurements, power on the HWA4214SD and make sure an
SD card is firmly seated in the socket on the bottom of the instrument.
The meter can make and display two kinds of measurements:
• Air speed and temperature (simultaneously)
• Surface temperature, as measured by an optional Type K or Type J thermocouple
2. To select the measurement mode, use the FUNC./HOLD/NEXT button. Pressing the
button repeatedly toggles between the two modes. When the FUNC./HOLD/NEXT button is
released, the selected mode becomes the default until the button is pressed again.
By default, the HWA4214SD uses Celsius units for temperature measurements. If you wish
to make Fahrenheit units the default, press the SET M button to enter the setup procedure
and perform Step 8.
3. To measure air velocity and temperature simultaneously:
a. Seat the telescoping probe plug (callout 1-17 of Fig. 1) in its socket (callout 1-7) on
the top of the instrument.
b. Press the FUNC./HOLD/NEXT button until the display shows the term "Air".
c. Holding the probe by its handle, slide the sensor cover (callout 1-19) on its end down
to expose the sensor. Do not touch the sensor with tools or your fingers; the thin hot
wire and thermistor inside it are easily damaged.
d. Extend the probe to a convenient length.
e. Rotate the probe until the mark on top of the sensor head faces the wind or the
flow of air whose speed/temperature you wish to measure. The upper part of the
display will show the air speed while the lower part will show the temperature
(as "ºF" or "ºC").
To change the unit of air speed, use the REC/ENTER button (which has the word "Unit"
stenciled below it). Repeated presses of the button cycle through the five options for air
speed units: m/s (meters/second), fpm (feet per minute), km/h (kilometers/hr), knots
(nautical miles per hour), and mph (miles per hour). Release the REC/ENTER button when
the unit you wish to use appears, making it the default until changed.
4. To measure surface temperature using a thermocouple, make sure the multi-function
probe is not in its socket. Plug an optional Type K or Type J thermocouple into its dedicated
socket (callout 1-8 of Fig. 1). Then press the FUNC./HOLD/NEXT button until the display
shows the term "tP".
Touch the wire end of the thermocouple to the surface whose temperature you wish to
measure. The display will show its temperature (as "ºF" or "ºC").
By default, the HWA4214SD is configured for a Type K thermocouple. To use a Type J
thermocouple, press the SET M button to enter the setup procedure and perform Step 7.
Whenever the instrument is operating in measurement mode, you can turn off the backlight
(which is on by default) by briefly pressing (but not holding) the POWER/ESC button. To
reactivate the backlight, briefly press the button again.
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