99 Washington Street Melrose, MA 02176 Phone 781-665-1400 Toll Free 1-800-517-8431 Visit us at www.TestEquipmentDepot.
Introduction Congratulations on your purchase of the Extech 42280 Thermometer and Relative Humidity Datalogger. The 42280 is a wall-mount, tripod mount, or desktop indoor air quality monitor with an internal memory capable of storing 16,000 readings (8000 temperature readings and 8000 relative humidity readings) that can later be transferred to PC using the USB interface. Real-time meter-to-PC logging is also supported.
Description Meter Description 1. Humidity Sensor (internal Temperature sensor) 2. Audible alarm (with AC adaptor power only) 3. Visual Alarm LED 4. Relative Humidity display 5. Date and Time display 6. Temperature display 7. RECORD status LED 8. USB port 9. AC Adaptor jack 10. Datalogger START-STOP button 1 2 4 6 3 7 5 8 9 11. MODE button 12. SET button 13. Up Arrow button 10 11 14. Down Arrow button 15 12 13 14 15.
Operation Important Note before starting This meter relies on firm button presses to operate correctly. Be sure to press firmly and hold the button for as long as directed in the instructions. Meter Power 1. The meter is powered by four (4) ‘AA’ 1.5V batteries or the 117V AC adaptor. 2. When the batteries are installed or the adaptor is connected to an AC power source, momentarily press the START-STOP button to turn the meter ON. 3. Press the START-STOP button again to turn the meter OFF.
Manual Programming The Model 42280 has several programming modes (P1, P2, P3, P4, P5, and P6). These parameters must be programmed before the Datalogger or the Alarm can be used. List of Programming Modes P1 - Number of samples to record (1, 2, 4, 8, 12, or 16 x 1000; 1=1000, 2=2000, etc.
Programming Mode P2; Datalogger Start Modes 1. Press the SET button to access the setup mode 2. Use the arrow buttons to select parameter P2 3. Press the SET button again 4. Select one of the four Start modes using the up/down arrow buttons (see list and diagram below) a. rEp (Repeat Start mode): Logger starts once readings are downloaded to PC b. hEy (Keypad Start): Datalogging begins after the START/STOP button is held for 2 seconds c.
Programming Mode P3; Datalog Start Time Note that parameter P3 will only be visible if the Start MODE is set to SHCEDULE (Parameter P2 set to ‘SCh’). 1. Press the SET button to access the setup mode Y-M-D 2. Use the arrow buttons to select parameter P3 3. Press the SET button again 4. Use the up/down arrow buttons to set the year Y-M-D Y-M-D 5. Press the SET button again 6. Use the up/down arrow buttons to set month 7. Press the SET button again 8.
Programming Mode P4; Datalogger Sample Rate 1. Press the SET button to access the setup mode 2. Use the arrow buttons to select parameter P4 3. Press the SET button again 4. Use the up/down arrow buttons to set hours 5. Press the SET button again 6. Use the up/down arrow buttons to set the minutes 7. Press the SET button again 8. Use the up/down arrow buttons to set the seconds 9. Press SET again to store the settings 10. Press the MODE button to back out to the top level of this menu. 11.
Programming Mode P6; Real Time Clock H:M:S 1. Press the SET button to access the setup mode 2. Use the arrow buttons to select parameter P6 3. Press the SET button again 4. Use the up/down arrow buttons to set the year 5. Press the SET button again 6. Use the up/down arrow buttons to set month 7. Press the SET button again 8. Use the up/down arrow buttons to set the day 9. Press the SET button again 10. Use the up/down arrow buttons to set the hours 11. Press the SET button again 12.
Datalogging Starting a Datalogging session The 42280 can automatically store up to 16,000 readings (8000 temperature and 8000 humidity) for later transfer to PC. Program the controller, as discussed earlier, before Datalogging. If the Datalogger has not been configured at this point, configure as necessary. If programming is complete, continue with the next section. Starting the Datalogger by push-button (Key Mode) 1.
Connecting the Meter to a PC A USB cable is provided with the meter. One end of the cable connects to the meter’s USB jack and the other end connects to a USB port on the PC. Running the supplied PC software The supplied PC software is included on the supplied CD-ROM. Insert the CD into the computer’s CD-ROM drive and follow the on-screen prompts and instructions. In the software COM PORT SETTING field, select the COM port to where the meter is connected.
Humidity Calibration 1. Turn on the meter and plug the humidity sensor probe into the 33% Calibration Reference bottle. 2. Simultaneously press and hold the START-STOP and the SET buttons for at least 2 seconds to enter the 33% Calibration mode. The display ’32.8%’ will begin to flash on the display. 3. Approximately 30 minutes later, the ’32.8%’ display will stop flashing, indicating that the 33% calibration is complete 4. Plug the humidity sensor probe into the 75% Calibration Reference bottle. 5.
Specifications General Specifications Display Multi-function LCD with status LED indicators Measurement ranges Temperature: -4 to 144 F (-20 to 70 C) o o Humidity: 0 to 100% o o Dew Point temperature: -4 to 144 F (-20 to 70 C) o o Resolution 0.1 C / F / % Accuracy Temp: +/- 1.0°F (0.6°C) from 32 to 122°F (0 to 50’C) +/-2.0°F (1.
Troubleshooting Power is ON but there’s no display Check that the batteries or the AC adaptor is installed and connected properly Ensure that the START-STOP button is pressed firmly and for at least 100ms Calibration Failure Check that the batteries or the AC adaptor is installed and connected properly Ensure that the calibration bottles are tightly sealed around the meter sensor Ensure that calibration takes place at room temperature Flashing Indicators Display flashes in logging mode when the AC adaptor h
