Extech SDL310 Operating Manual

Vane Thermo-Anemometer /
Datalogger

Model SDL310

USER GUIDE

Introduction

Congratulations on your purchase of the Extech SDL310 Thermo-Anemometer Datalogger. This meter
displays and stores air velocity and temperature readings. Temperature readings from the
thermometer built into the vane probe or from an externally connected type K or J thermocouple
temperature probe can be displayed and recorded. Data is stored on an SD card for transfer to a PC.
In addition, an RS232 port allows data streaming to a PC. This instrument is shipped fully tested and
calibrated and, with proper use, will provide years of reliable service. Please visit the Extech
Instruments website (www.extech.com
Instruments is an ISO-9001 certified company.

) to check for the latest version of this User Guide. Extech

Safety

International Safety Symbols

This symbol, adjacent to another symbol or terminal, indicates the user must refer to the
manual for further information.

Meter Description

1. Thermocouple input

2. Vane input plug

3. Air velocity reading

4. Units of measure

5. HOLD / Backlight

6. MAX-MIN key

7. SET and Clock

8. PC interface jack

9. Reset key

10. Power Adaptor jack

11. SD card slot

12. ENTER and LOG key

13. Down ▼arrow and FUNCTION key

14. Up ▲ arrow and UNITS key

15. Power ON-OFF

16. Temperature reading with units of measure

17. Anemometer vane

18. Colored dot faces the air flow

19. Vane handle

20. Vane connecting cable

Notes:

Battery compartment, tilt stand, and tripod mount are located on the rear of the instrument.

Items 8, 9, and 10 are located behind the snap-off compartment cover on right side of meter.

key

key

key

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Operation

Power ON-OFF

 Power the meter by pressing and holding the power key

 Press and hold the power key for at least 1.5 seconds to power OFF the meter.

Meter Functions

This meter has two modes of operation. Press and hold the FUNCTION key for at least 1.5 seconds
to switch from one mode to the other.

 Air Velocity plus Temperature mode (meter briefly displays An icon)

 Type K or J thermocouple temperature mode (meter briefly displays tP icon)

Air Velocity plus Temperature Mode

1. Select the Air Velocity and Temperature mode.

2. Connect the vane probe to the meter’s probe jack (top right of meter) via the probe plug.

3. Hold the probe by its handle and allow the air flow to enter the vane. Note that the air flow must
face the vane’s colored dot.

4. The meter will display the air velocity measurement (upper display area) and the air
temperature (lower display area)

Changing the Air Velocity Unit of Measure

This meter offers five (5) units of measure selections for air velocity: m/s (meters per second), FPM
(feet per minute), Km/h (kilometers per hour), knots, and mph (miles per hour).

1. Press and hold the UNIT key for at least 1.5 seconds to switch from one unit of measure to
another.

2. Note that pressing and holding the UNIT key continuously allows for quicker scrolling. Release
the key when the desired unit of measure is displayed.

Thermcouple (Type J or K) Temperature Mode

1. Select the Thermocouple Temperature mode using the FUNCTION button.

2. The meter will display a ‘J’ or a ‘K’; on the left side of the display indicating the current setting.
To change the thermocouple type, refer to the Setup Mode section.

3. Connect a Type J or Type K thermocouple to the meter’s sub-miniature thermocouple jack (top
of meter on the left).

4. Hold the thermocouple in the air in the area to be tested.

5. The meter will display the thermocouple temperature in the main display area.

6. To change the temperature unit of measure (°C and °F) refer to the Setup Mode section.

Data Hold

To freeze a measurement on the display, press the HOLD key momentarily. The meter will emit a
beep, the reading will hold, and the HOLD display icon will switch on. Press the HOLD key again to
release the display and exit the Data Hold mode returning the meter to the normal operating mode.

for at least 1.5 seconds.

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MAX-MIN Readings

For a given measurement session, this meter can record the highest (MAX) and the lowest (MIN)
readings for later recall.

1. Press the MAX-MIN key momentarily to access this mode of operation (REC icon appears)

2. The meter is now recording the MAX and MIN readings.

3. Press the MAX-MIN key again to view the current MAX reading (MAX icon appears). The
reading on the display is now the highest reading encountered since the REC icon was
switched on (when the MAX-MIN key was first pressed).

4. Press the MAX-MIN key again to view the current MIN reading (MIN icon appears). The
reading on the display is now the lowest reading encountered since the REC icon was
switched on (when the MAX-MIN key was first pressed).

5. To exit the MAX-MIN mode, press and hold the MAX-MIN key for at least 1.5 seconds. The
meter will beep, the REC-MAX-MIN icons will switch off, the memory will clear, and the meter
will return to the normal operating mode.

Display Backlight

To turn the display backlight ON or OFF, press and hold the backlight
seconds. The meter will beep when switching the backlight ON or OFF unless the beeper is
disabled as described in the Setup Mode section of this user guide.

System Reset

If the meter’s keys become inoperable or if the display freezes, the Reset button can be used to
reset the instrument.

1. Use a paper clip or similar item to momentarily press the reset button located on the lower right
side of the instrument under the snap-off compartment cover.

2. After pressing the Reset button, switch the instrument ON by pressing and holding the
POWER key for at least 1.5 seconds. If using the power adaptor, unplug the adaptor and then
plug it back in again to power the meter.

AC Power Adaptor

This meter is normally powered by six (6) 1.5V ‘AA’ batteries. However, an optional AC 9V power
adaptor is available. To use the adaptor, insert the power adaptor plug into the jack on the bottom
right side of the meter (under the snap-off compartment cover); plug the other end of the adaptor
into an AC power source. The meter will now be permanently powered (as long as the adaptor is
used) and the power key will be disabled.

key for at least 1.5

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