Extech Instruments 45170CM User Manual page 3

Measurements
A. Air Velocity Measurements
1. Use the Mode button to step to the Anemometer mode (An). In Anemometer mode,
the display will show Air Velocity and Temperature.
2. Press Unit button to select desired unit of measure (FPM, MPH, KNOT, KM/H, or M/S).
3. Face the Air Flow Sensor into the source of the air stream.
4. Allow time for the reading to stabilize and then note the value on the display.
B. Relative Humidity and Ambient Air Temperature Measurements
1. Use the Mode button to step to the RH mode (rH). In RH mode, the display will show
the Relative Humidity reading (upper right) and the Temperature reading (lower left).
2. Press the °C/°F button to select the desired temperature unit of measure.
C. Temperature Measurements Using Type K Thermocouple
1. Use the Mode button to step to the Type K Temperature mode (tP). In Temperature
mode, the display will show only the thermocouple temperature.
2. Plug the thermocouple into the meter's thermocouple input jack on the face of the
meter. If no thermocouple is connected, or if the thermocouple is defective, the meter
will display dashes.
3. Press the °C/°F button to select the desired temperature unit of measure.
D. Light Measurements
1. Use the Mode button to step to the Light Meter mode (Light). For convenience, the LCD
display is orientated 180° from all of the other function displays.
2. Press the Lux/Ft‐cd button to select Lux or Footcandle units of measure.
3. Before making measurements 'zero' the meter by blocking the light sensor (to cause a
'no light' condition) and pressing the Z button. The reading should zero.
4. To measure light, position the meter so that the light source shines as directly as
possible on the meter's light sensor dome. Note the reading on the display.
E. Airflow (CFM, CMM) Measurements
1. Use the Mode button to select the Air Flow mode (AirFL). In Airflow mode, the meter
can measure the volume of air moving through a duct, for example. The display will
show the CFM (cubic feet per minute) or CMM (cubic meters per minute) unit icon on
the bottom of display. Use the UNIT button to toggle CFM and CMM units.
2. Press the Area button (A) and then use the and ▲▼ buttons to program the area
value. Press the REC / Enter button to save the area value. See the 'Useful Equations'
section for help on calculating the area of a duct or other airway.
3. For air flow measurements the area units are meters squared or feet squared. The
lower display will show m‐2 (for CMM) or F‐2 (for CFM).
4. The area setting range is 0.001 to 30.000 meters squared or 0.01 to 322.92 feet
squared.
5. After programming the area, face the anemometer sensor into the wind source and
note the CFM or CMM air volume reading.
3
45170CM‐en‐GB_V1.1 1/15