User's Guide pH/ORP Meter SD Card real-time Datalogger Model SDL100
Introduction Congratulations on your purchase of the Extech SDL100 pH/ORP Meter, an SD Logger Series meter. This meter displays and stores pH (from 0 to 14.00pH) and ORP (±1999mV) readings. A temperature probe (supplied) can be inserted to the meter to provide automatic temperature compensation. Logged data readings are stored on an SD card for transfer to a PC. In addition, an RS232 port allows data streaming to a PC.
Getting Started Power ON-OFF • Press and hold the power button for at least 1.5 seconds to power ON the meter. • Press and hold the power button for 1.5 seconds to power OFF the meter. • This meter is powered by six (6) 1.5VDC ‘AA’ batteries or by optional AC adaptor.
Manual / Automatic Temperature Compensation (for pH measurements only) Ph measurements are most accurate when the temperature of the solution under test is known and a temperature compensation factor is applied to the measurement. This is achieved using Manual or Automatic Temperature Compensation. For Manual Temperature Compensation, the external temperature probe is not connected to the meter and the temperature of the solution under test is manually entered in the Setup Mode.
Setup Mode Basic settings at a glance To view the current configuration of the meter with regard to time, date, and datalogging sampling rate press the SET button momentarily. The meter will now 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 5 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).
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.
Clearing pH Calibration data 1. From the normal operation mode, press and hold the CAL button for at least 1.5 seconds until the CAL icon appears on the display and then release the CAL button 2. Use the arrow keys to scroll to the CLR display 3. Press ENTER and all calibration data will be erased Datalogging and PC Interface Types of Data Recording • • • Manual Datalogging: Manually log up to 99 readings onto an SD card via push-button press.
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. Select the sampling rate in the Setup Mode (refer to Setup Mode section) to a value other than zero. 2. Press and hold the LOG button for at least 1.5 seconds.
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. Battery Replacement and Disposal When the low battery icon appears on the LCD, the batteries must be replaced.
Specifications General Specifications Display 52 x 38mm (2 x 1.5”) Backlit LCD Status indicators Out-of-range (----) and low battery Measurement Units pH, ORP, °C, and °F Temperature probe Thermistor (PN 850188) Datalogger Sampling Rate AUTO LOGGING: From 1 second to 8 hours 59 minutes and 59 seconds. Note that a one (1) second sampling rate can cause some data loss on slower computers Display update rate Approx. 1 second.
