User manual

User Manual Model 45158 Mini Hygro Thermo-Anemometer
Introduction
Congratulations on your purchase of Extech’s Model 45158 Anemometer. The dual
display indicates Air Velocity and Humidity, Dew Point, Ambient Temperature, or
Temperature with wind-chill factor. With careful use, this meter will provide years of
reliable service.
Operation
Turning the meter ON and OFF
• Press the ON/OFF/HOLD button to turn the meter ON
• Press and hold the ON/OFF/HOLD buttons for approx. 3 seconds to turn it OFF
• The meter’s Auto Power OFF feature turns the meter OFF after 20 minutes of inactivity
Change the lower display parameter
• With the meter ON, press and hold down the ON/OFF/HOLD button
• While continuing to hold the ON/OFF/HOLD button, press the UNITS/MODE button
repeatedly to step through Temperature (oF/oC), Humidity (RH%), Dew Point (TD), &
Temperature with wind-chill factor (WCI). Note that the center display is Air Velocity.
Change the Air Velocity unit of measure
• Turn the meter OFF. Press and hold down both buttons until the display turns on and
begins blinking then release both buttons
• Press the UNITS/MODE button repeatedly to step through the units (see specs for list)
• After 5 seconds the meter switches back to normal operation mode automatically
Select temperature units (oC or oF)
• Turn the meter OFF first. Press and hold down both buttons until the display turns on
and begins blinking then release the buttons
• Press both buttons momentarily to change temperature units
• After 5 seconds the meter switches back to normal operation mode automatically
Taking Measurements
• Position the meter so that the airflow enters the meter vane from the rear of the meter
(opposite side of front panel logo). A tripod mount is located on the bottom of the meter.
Max Hold
• Max Hold represents the highest measurement taken since the meter was turned on
• Press the UNITS/MODE button to display the Max reading (MAX icon appears)
• Press the UNITS/MODE button repeatedly to step through to the normal operating
mode
Average mode
• 5 or 10 reading averages can be displayed in the Average Mode.
• Press UNITS/MODE 3 times for 5 reading averaging or 4 times for 10 readings
• To exit this mode, press the UNITS/MODE button until the icons on the left disappear
Data Hold
• Data Hold freezes the most recent displayed reading
• Press and hold the ON/OFF/HOLD button to activate Data Hold
• As long as the ON/OFF/HOLD button is held the reading will remain on the LCD
Meter Description
1 Vane impeller
2 Impeller set screw (on rear of meter)
3 Relative Humidity sensor
4 Temperature sensor
5 LCD display
6 ON/OFF, HOLD key
7 UNITS, MODE key
8 Battery compartment (on rear)
9 Tripod mounting hole
10 Lanyard (neckstrap)
Specifications
Measurement Range Resolution Accuracy (% of reading)
MPH (Miles per hour) 1.1 to 62.5 MPH 0.2 MPH ± (3% + 0.4 mph)
km/hr (kilometers per
hour)
1.8 to 100.6 km/h 0.7 km/h ± (3% + 1.4 km/hr)
Knots (nautical miles
per hour)
1.0 to 54.3 knots 0.3 knots ± (3% + 0.6 knots)
m/sec (meters per
second)
0.50 to 28.00 m/s 0.01 m/s ± (3% + 0.2 m/s)
ft/min (feet per
minute)
100 to 5500 ft/min 20ft/min ± (3% + 40 ft/min)
Beaufort force 1 to 17 BF 1 BF ± 1
Temperature 0 to 122
o
F (-18 to 50
o
C) 0.1
o
F/C ± 1.8
o
F (± 1
o
C)
Relative Humidity 10 to 95% 1% ± 5% RH
Dew Point 32 to 122
o
F (0 to 50
o
C) 0.1
o
F/C ± 3.6
o
F (2
o
C)
General Specifications
Display Dual LCD with low battery and multifunction indicators
Sensors Sapphire bearing, non-corrosive vane for air velocity;
Precision thermistor for temperature measurements
Average Mode Choice of 5 or 10 reading averaging (2 second factory
default)
Max and Data Hold
Displays
Max recalls the highest reading; Data Hold freezes the
display
Sample time 1 reading per second for air velocity and temperature
(1 reading per 15 seconds for humidity with 2 second
updates)
Water-resistant To 3’ (1m)
Operating conditions 5 to 122
o
F (-15 to 50
o
C) / < 80% RH
Power supply Lithium battery (CR-2032 or equivalent) / 400 hour battery
life
Dimensions / Weight Instrument: 5.25 x 2.75 x 0.75” (133 x 70 x 19mm)
Vane: 1” ( 24mm ) diameter / 3 oz. ( 95 g )
Maintenance
Battery Replacement
The 45158 has a low battery indicator (battery symbol).
Important: Turn the meter off before opening the battery
compartment. Using a coin, turn the battery compartment cover
CLOCKWISE to remove it. Once opened, observe the position of
the battery, placing the new one in the same position. Secure the
battery compartment cover and dispose of the lithium battery in
accordance with local, state, or national disposal codes.
You, as the end user, are legally bound (Battery
ordinance) to return all used batteries and
accumulators; disposal in the household garbage is
prohibited!
You can hand over your used batteries / accumulators,
gratuitously, at the collection points for our branches in
your community or wherever batteries / accumulators
are sold!
Disposal
Follow the valid legal stipulations in respect of the
disposal of the device at the end of its lifecycle
Impeller Replacement
• Remove the set screw next to the impeller assembly (on the
rear of the meter).
• Twist the impeller assembly counter-clockwise to the OPEN
position and remove it.
• Install impeller by inserting & twisting the new impeller
assembly clockwise
• Tighten the set screw.
CFM Measurements
Measure the area of the duct using the diagrams below for rectangular and circular ducts (If
the duct measurements are made in inches, divide the inches by 144 to get the area in
square feet). Plug the area value (in square feet) in the cubic equations below. Note that
the air velocity must be plugged into the cubic equations also.
CFM (ft
3
/min) = Air Velocity (ft/min) x Area (ft
2
)
CMM (m
3
/min) = Air Velocity (m/sec) x Area (m
2
) x 60
Copyright © 2007 Extech Instruments Corporation.
All rights reserved including the right of reproduction in whole or in part in any form.
V3.1 6/08