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User's Guide

5 in 1 Environmental Meter

Model: EN

Anemometer

Humidity Meter

Light Meter

Thermometer

Sound Level Meter

Introduction

Congratulations on your purchase of this Extech Meter. The EN300 is five professional meters built into one convenient package. This meter ships fully tested and calibrated and, with proper use, should provide many years of reliable service.

Features

This 5-in-1 professional measuring instrument provides the following functions:

1. Anemometer uses a low-friction ball bearing mounted wheel design for high accuracy.
2. Humidity meter uses a high precision humidity sensor for fast response time.
3. Light meter uses a photo diode and color correction filter light sensor; spectrum meets C.I.E. photopic.
4. Type K thermometer uses standard type K (NiCr-NiAl) thermocouple input jack suitable for diverse application type K probes.
5. The sound level meter meets IEC 61672 class 2 with "A" frequency weighting and "Fast" time response.

Common Features:

• Built-in microprocessor circuit assures excellent performance and accuracy.
• Concise and compact button arrangement for ease of operation.
• Record / recall maximum and minimum values.
• Hold function freezes the current reading value.
• Front panel °C / °F selection button.
• Front panel Lux/Foot-candle selection button.
• Five (5) air velocity measurement units, selected by a front panel button.
• Dual display with simultaneous display of relative humidity and temperature or air velocity and temperature.
• Zero button for light meter.
• Robust housing suitable for one hand operation

Meter Description

1. Microphone
2. Light Sensor
3. LCD display
4. Hold Button
5. Power Button
6. Unit / Zero Button
7. Air Speed Sensor
8. Thermocouple Input Socket l
9. RS-232 Output Terminal
10. AC power adaptor socket
11. Max. / Min. Button
12. Function Button
13. °C/°F Button/Lux/Ft-cd Button
14. On rear: Battery Compartment, Tripod mount, Stand

Operation

Powering the meter

1. Press the Power button to turn the instrument ON
2. If the meter does not turn on or if the " " low battery symbol appears in the display, replace the batteries.
3. Press the Function button to select the measurement needed.

Note: The display orientation rotates, depending on the function selected. Microphone up: Sound, Light, Temperature Air speed sensor up: Airspeed + Temperature, Humidity + Temperature

Anemometer Air Velocity Measurement

1. Select the Anemometer function by pressing "Function Button" until the display indicates Anemometer units (ft/min, m/s, km/h, MPH, or knots).

2. Press the "Unit/Zero Button" to select unit desired

3. Press the “°C/°F Button” to select the temperature unit.

4. Face the air velocity sensor into the source of wind.

5. The display will show the air velocity and the ambient temperature.

6. Allow time for the reading to stabilize and note the values indicated. Air velocity may fluctuate slightly.

Temperature Measurement (Thermocouple)

1. Plug a type K thermocouple probe into the "Thermocouple Input Socket".
2. Select the temperature function by pressing "Function Button" unit the display shows temperature units (°C or °F).
3. Contact the Thermocouple Sensor Head with object to be measured
4. The temperature value will be displayed on the LCD display.

Note: Verify the polarity when plugging a thermocouple probe into the temperature input socket.

Any temperature difference between thermocouple probe and thermometer can result in inaccurate measurement result. Therefore, allow time for thermal equalization between probe plug and meter input socket. The thermal equalization procedure takes few minutes and should be applied only when the probe has been exposed to ambient temperature different from the meter

Changing °C / °F units

During temperature measurements, press the °C / °F button once to change the temperature units from "°C" to "°F".

Hold Function

Press the "Hold Button" to freeze the current reading value, "HOLD" symbol appears on the display. Press the button again to continue normal operation.

Data Record Function

1. The Data Record function records & displays the maximum and minimum reading values. Start the Data Record function by pressing the "Max/Min Button" once. The "REC" symbol appears on the display.
2. With the REC symbol on the display :

(a) Press the "Max/Min Button" once and the "Max" symbol along with the maximum value will appear on the display.

(b) Press the "Max/Min Button" again; the "Min" symbol along with the minimum value will appear on the display.

(c) To exit the memory record function, press the "Max/Min Button" continuously for at least 2 seconds. The display will revert to the current reading.

(d) Clear the Max/Min value recorded by pressing the "Hold Button" once. Previous recorded Max/Min values will be erased and then return to REC function and continue recording.

Auto Power-off

To prolong the life of the batteries, the instrument has an "Auto Power-off" function. The meter will automatically switch off if there are no button presses in any 10-minute period.

RS232 port

The RS232 port is used to send measurement data to a PC.

Battery Replacement

1. When the LCD display shows " " symbol, it is necessary to replace the battery. However, measurement may still be made for several hours after the low battery indicator appears.
2. Remove the two battery cover screws and remove the battery cover.
3. Install fresh batteries DC 1.5 V battery, UM4/AAA x 6 PCs, and reinstall the cover.

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 at collection points 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

Specifications

General Specifications

Display LCD display, LCD size: 41.5 x 31.5 mm. Measurement 5 in 1 : Anemometer (Air velocity + Temperature) Humidity (%RH + Temperature) Light Thermometer ( type K ) Sound level Operating Humidity 80%RH Max. Operating Temperature 0 to 50°C (32 to 122°F) Over Input Display Indication of "- - - - " Data Output RS 232/USB PC serial interface Power Supply 1.5 DC V battery ( UM4, AAA ) x 6 PCs, 9V DC adapter input. (AC power adapter is optional). Power Consumption Anemometer: Approx. DC 11 mA Other functions: Approx. DC 7.5 mA Weight 335 g/0.74 lb (battery included). Dimension HWD 248 x 70 x 34 mm (9.8 x 2.8 x 1.3 inch).

Electrical Specifications

Anemometer (Air velocity/Temperature)

Units Range Res. Accuracy

ft/min 80 to 5910ft/min 1 ≤3900ft/min: ± 3% F.S., >3900ft/min:± 4% F.S.

m/s 0.4 to 30.0m/s 0.1 ≤20m/s : ± 3% F.S., > 20m/s : ± 4% F.S. km/h 1.4 to 108.0km/h 0.1 ≤72km/h: ± 3% F.S., >72km/h:± 4% F.S.

MPH 0.9 to 67.0mile/h 0.1 ≤45mile/h: ± 3% F.S.,>45mile/h:± 4% F.S.

knots 0.8 to 58.3 knots 0.1 ≤39 knots: ± 3% F.S.,>39 knots:± 4% F.S.

°F 32 to 122°F 0.1 ± 2.5°F °C 0 to 50°C 0.1 ± 1.2°C

Type K Thermocouple Thermometer

Units Range Resolution Accuracy

°F -148 to 2372 °F 0.1°F ± (1% rdg + 2°F)

°C -100 to 1300 °C 0.1°C ± (1% rdg + 1°C) Note: The type K thermocouple probe is optional