User's Guide Hot Wire Thermo-Anemometer with Datalogger Model SDL350 Hot Wire 5
Introduction Congratulations on your purchase of the Extech SDL350 Hot Wire Thermo-Anemometer Datalogger. This meter displays and stores air velocity and temperature readings. Temperature readings from the thermometer built into the 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. This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable service.
Operation Power ON-OFF Power the meter ON or OFF by pressing and holding the power key for at least 1.5 seconds. Meter Functions This meter has three modes of operation: Air velocity (with temperature), thermocouple temperature, and Air Volume (CFM/CMM). 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 displays An icon. • Type K or J thermocouple temperature mode (meter displays tP icon).
Air Flow (Volume CFM/CMM) 1. First measure and note the area of the duct or other passageway under test in square feet or square meters. For rectangular ducts, area is calculated using Length * Width; for circular ducts use 3.14 * R2. 2. Enter the area value in the SETUP mode (refer to SETUP mode section for details). 3. Select the Air Volume mode on the meter as described earlier using the FUNCTION key. 4.
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 in again to power the meter.
Automatic Datalogging In automatic datalogging mode the meter takes and stores a reading at a user-specified sampling rate onto SD card. The meter defaults to a sampling rate of one second. To change the sampling rate, refer to the Setup Mode section (the sampling rate cannot be ‘0’ for automatic datalogging): 1. To begin an automatic Datalog session press and hold the LOG key for at least 1.5 seconds. 2. The meter will scan for an SD card and verify that it can be used to store data.
RS-232/USB PC Interface The optional 407001A software kit (software and cable) allows streaming of data to a PC via the RS232 output jack located under the snap-off compartment cover on the meter’s right side. Setup Mode Basic settings at a glance To view the current configuration of the meter with regard to time, date, thermocouple type and datalogging sampling rate, press the SET/CLOCK ICON key momentarily. The meter will now display the configuration in quick succession.
Setting the Datalogger Sampling Time (Rate) 1. Access the SP-t parameter. 2. Use the arrow keys to select the desired sampling rate. The available settings are: 0, 1, 2, 5, 10, 30, 60, 120, 300, 600, 1800, and 3600 seconds. 3. Press the ENTER key to confirm the entry. 4. Press and hold the SET key for at least 1.5 seconds to exit to the normal operation mode (or simply wait 7 seconds for the meter to automatically switch to the normal operating mode). Enabling/Disabling the Auto Power OFF Feature 1.
Set the Temperature Units of Measure (°C or °F) 1. Access the t-CF parameter. 2. Use the arrow keys to select °C or °F. 3. Press ENTER to confirm setting. 4. Press and hold the SET key for at least 1.5 seconds to exit to the normal operation mode (or simply wait 7 seconds for the meter to automatically switch to the normal operating mode). Set the Temperature Thermocouple Type (J or K) 1. Access the tYPE parameter. 2. Use the arrow keys to select J or K. 3. Press ENTER to confirm setting. 4.
Specifications General Specifications Display Backlit LCD; LCD size: 52 x 38mm (2 x 1.
Electrical Specifications (Ambient Temperature 23°C ± 5°C) Air velocity Measurement m/s (meters/second) Km/h (kilometers/hour) mph (miles/hour) Knots FPM (Ft/min) Range Resolution Accuracy 0.2 - 5.0 m/s 0.01 5.1 – 25.0 m/s 0.1 0.7 - 18.00 km/h 0.01 18.0 – 72.0 km/h 0.1 0.5 – 11.20 mph 0.01 11.2 – 44.7 mph 0.1 0.40 – 9.70 knots 0.01 9.7 – 38.8 knots 0.1 40 - 3940 ft/min 1 ± (5%rdg + x) or ± (1%FS + x) (whichever is greater) (for x, see below) x =0.1 m/S; 0.3 km/h; 0.2 mph; 0.
