User's Guide Hygro-Thermometer / Datalogger Model SDL500
Introduction Congratulations on your purchase of the Extech SDL500 Hygro-Thermometer, an SD Logger Series meter. This meter displays and stores Temperature and Relative Humidity readings from the supplied probe and Temperature readings from an optional Type J or K Thermocouple probe. WET BULB and DEW POINT temperature calculations can also be displayed. Logged data readings are stored on an SD card for transfer to a PC.
Getting Started Power ON-OFF • • • Power the meter by pressing and holding the power button for at least 1.5 seconds. Press and hold the power button for at least 1.5 seconds to power OFF the meter. This meter is powered by six (6) 1.5VDC ‘AA’ batteries or by optional AC adaptor. If the meter will not switch ON please check that fresh batteries are installed in the rear battery compartment or, in the case of the AC adaptor, check that the adaptor is connected correctly to the meter and to an AC source.
Setup Mode Basic settings at a glance To view the current configuration of the date and datalogging sampling rate, press the SET button momentarily. The meter will display the configuration in quick succession. Repeat as necessary to observe all the information. Accessing the Setup mode 1. 2. 3. 4. 5. Press and hold the SET button for at least 1.5 seconds to access the Setup menu. Press the SET button momentarily to step through the available parameters.
Enabling/Disabling the Auto Power OFF Feature 1. 2. 3. 4. Access the PoFF parameter. Use the arrow buttons to select ON (enable) or OFF (disable). With the Auto Power OFF feature enabled, the meter will automatically switch OFF after 10 minutes of inactivity. Press ENTER to confirm setting. Press and hold the SET button 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).
Measurements and related features Relative Humidity / Temperature Probe Measurements 1. Connect the supplied Relative Humidity/Temperature Probe to the meter as previously described. 2. Press and hold the FUNCTION button until the ‘RH’ display icon appears and then release the button. 3.
Wet Bulb Temperature Calculation Display The SDL500 can display the results of a Wet Bulb calculation based on Relative Humidity and Temperature. Follow the instructions for the ‘Relative Humidity /Temperature Probe Measurements’ section above but release the FUNCTION key when the ‘_Et’ display icon appears. The display will now show the Wet Bulb Temperature. Data Hold To freeze a measurement on the display, press the HOLD button momentarily.
Datalogging Types of Data Recording • • Manual Datalogging: Manually log up to 99 readings onto an SD card via push-button press. Automatic Datalogging: Automatically log data onto an SD memory card where the number of data points is virtually limited only by the card size. Readings are logged at a rate specified by the user. SD Card Information • • • Insert an SD card (from 1G size up to 16G) into the SD card slot at the bottom of the meter.
Automatic Datalogging In automatic datalogging mode the meter takes and stores a reading at a user-specified sampling rate onto an SD memory 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 button 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.
Spreadsheet data example 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. AC Power Adaptor This meter is normally powered by six (6) 1.5V ‘AA’ batteries. An optional 9V power adaptor is available. When the adaptor is used, the meter is permanently powered and the power button will be disabled. 10 SDL500-EU-EN-V1.
Battery Replacement and Disposal When the low battery icon appears on the LCD, the batteries must be replaced. Several hours of accurate readings are still possible in this condition; however batteries should be replaced as soon as possible: • Remove the two (2) Phillips screws from the rear of the meter (directly above the top of the tilt stand). • Remove and safely place the battery compartment and screws where they will not be damaged or lost. • Replace the six (6) 1.5V ‘AA’ batteries observing polarity.
Electrical Specifications (ambient temperature 23°C ± 5°C) Humidity and Probe Temperature Humidity Temperature Range 5% to 95% RH Resolution 0.1 % RH Accuracy ≥70% RH: ±(3% rdg + 1% RH) <70%RH: ±3% RH Range 0 to 50°C (32 to 122°F) Resolution 0.1°C/°F Accuracy ±0.8°C (1.5°F) Dew Point Temperature °C °F Range -25.3 to 48.9°C Resolution 0.1°C Range -13.5 to 120.1°F Resolution 0.
