Extech Extech 45170 Manual

User's Guide

4-in-1 Humidity, Temperature
Airflow and Light Meter

Model 45170

99 Washington Street
Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Introduction

Congratulations on your purchase of Extech’s Model 45170 4-in-1 Humidity,
Temperature, Airflow and Light Meter. With careful use, this meter will provide years of
reliable service.

Meter Description

1. Vane Airflow Sensor

2. Type K Thermocouple Input Jack

3. Display

1

4. Power Button

5. Unit /Zero Button

6. C°/F° /Lux/Ft-cd Button

7. Light Sensor

8. RH and Air Temperature Sensors

9. Hold Button

10. Max/Min Button

11. Function Button

2

3

4

5

6

7

8

9
10

11

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Operation

Turn Power ON

Press the power button to turn power on. The meter will perform a short self-test.

A. Air Velocity Measurements

1. Press the Function button to select the Anemometer mode. In Air Flow mode,
the display will show Air Velocity and Temperature.

2. Press Unit/Zero button to select desired unit of measure (FPM, MPH, KNOT,
KM/H, or M/S) and face the Air Flow Sensor towards the source of wind.

3. Allow time for the reading to stabilize and note value. From a practical point of
view the velocity may fluctuate slightly.

B. Humidity and Ambient Air Temperature Measurements

1. Press the Function button to select RH mode.. In RH mode, the display will
show %RH and Temperature.

2. Press the °C/°F button to select the desired temperature unit of measure.

C. Temperature Measurements Using Type K Thermocouple

1. Press the Function button to select the Temperature mode. In Temperature
mode, the display will show only temperature.

2. Plug the thermocouple into the meter's thermocouple input jack. If no
thermocouple is connected, or if the thermocouple is defective, the meter will

display “
is connected).

D. Light Measurements

1. Press the Function button to select the Light Meter mode . The light values
are displayed and orientated 180° from the other functions for easy use.

2. Press the Lux/Ft-cd to select Lux or Footcandle units of measure.

3. Before making measurements “Zero” the meter out by blocking the light
sensor to simulate a no light condition and pressing the Unit/Zero button.The
reading should go to Zero.

4. Hold the sensor toward the light source and note reading.

MIN, MAX, Data Recording Function

1. Press the Max/Min button once. The RECORD symbol will appear on the
display.This starts the Min/Max Data Recording Mode.

2. Press the Max/Min again and the MAX symbol along with the maximum value will
appear on the display.

3. Press the Max/Min once more and the MIN symbol along with the minimum value
will appear on the display.

4. To Clear the recorded Max/Min values press the HOLD button once. Press and
Hold the Max/Min button for 3 seconds to exit Min/Max Data Record Mode and
return to normal measurement mode. Record and Max/Min will disappear from the
display once this is done.

-----

“. (Primary display temperature will only work if a thermocouple

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Data Hold

Press the HOLD button to freeze the reading in the display. The 'HOLD' icon will appear on
the upper right-hand side of the display. Press the HOLD button again to return to normal
operation (the 'HOLD' hold icon will disappear).

Auto Power OFF

The meter will automatically turn off after 10 minutes if no keys are pressed during this
period. Auto power off is disabled in the max/min recording mode.

Turning Power OFF

Press the power button to turn power off.

Calibration and Repair Services

Extech offers repair and calibration services for the products we sell. Extech also

provides NIST certification for most products. Call the Customer Care Department for
information on calibration services available for this product. Extech recommends that
annual calibrations be performed to verify meter performance and accuracy.

Useful Equations

Area equations

Cubic equations

H

W

A = W x H

3

CFM (ft

/min) = Air Velocity (ft/min) x Area (ft2)

CMM (m3/min) = Air Velocity (m/sec) x Area (m2) x 60

A = pi x R

R

2

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Specifications

Range Specifications

Measurement Range Resolution

MPH (Miles per hour) 0.9 to 67.0MPH 0.1MPH
km/hr (kilometers per hour) 1.4 to 108.0 km/h 0.1km/h
Knots (nautical miles per hour) 0.8 to 58.3 knots 0.1knots
m/sec (meters per second) 0.4 to 30.0 m/s 0.1 m/s
ft/min (feet per minute) 80 to 5910 ft/min 1ft/min
Temperature/Thermistor 32 to 122oF (-0 to 50oC) 0.1oF/C ± 2.5oF (± 1.2oC)
Temperature /Thermocouple -148 to 2372°F

-100 to 1300°C

Relative Humidity 10.0 to 95.0% 0.1% ±4% RH (from 10% to 70%RH)

Light (Auto Ranging ) 0 to 2,200 Lux 1 Lux

1,800 to 20,000 Lux 10 Lux
0 to 204.0 Fc 0.1 Fc
170 to 1,860 Fc 1 Fc

General Specifications

Display 4 digit (9999 count) Dual Display LCD
Sensors Thin film capacitance humidity sensor
Min/Max Min/Max recalls the highest/lowest reading
Data Hold Data Hold freezes the display
Operating conditions 32 to 122oF (0 to 50oC) / < 80% RH
Power supply 9 Volt Battery
Dimensions / Weight Instrument: 6.14 x 2.36 x 1.29” (156 x 60 x 33mm)

Vane: 1” ( 24mm ) diameter / 5.7 oz. ( 160 g )

0.1°F

0.1°C

Accuracy

≤ 3937 ft/min: ±3% F.S.

> 3937 ft/min: ±4% F.S

± (1% + 2°F)
± (1% + 1°C)

±4%rdg +1.2% RH (> 70% RH)

±5% rdg +8 digits

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45170 V1.1 5/09

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