USER MANUAL USB Multi‐Function Dataloggers RHT30 Humidity/Temperature Datalogger TH30 Dual Temperature Datalogger Additional User Manual Translations available at www.extech.
Introduction Thank you for selecting the Extech multi‐function, easy‐to‐use, portable USB datalogger. The RHT30 offers temperature and humidity logging and the TH30 offers internal (air) and external (probe) temperature logging. These USB dataloggers can be configured and customized by the user by plugging them into a PC USB port, following the on‐screen prompts, and making selections on the supplied ‘PDF Logger Configuration Tool’.
5. Status LED indicator (red/green). Refer to the Status LED Indicator Description later in this section. 6. MAX‐MIN button. Refer to the Button Descriptions later in this section. 7. Sensors (Thermistor internal air temperature and capacitive RH sensor) 8. Power and Datalog Start/Stop button. Refer to the Button Descriptions later in this section. 9. MARK/Battery life button. Refer to the Button Descriptions later in this 11 12 section. 10 10. USB plug 11.
Display (LCD) Description o F oC RH% T1 T2 H L REC Temperature unit of measure as programmed by the user Displayed when showing Relative Humidity reading (RHT30) Represents the internal sensor (air) temperature (TH30) Represents the external probe temperature. If no probe is connected, the display will show dashes for the T2 temperature reading (TH30) High Alarm triggered Low Alarm triggered REC flashes once per second when actively datalogging.
PDF Logger Configuration Tool Connect the datalogger to PC USB port. The PC will prompt to view files. Open the ‘PDF Logger Configuration Tool’ from the list of available files. Refer to the Operation Section for additional details on this tool: 2 3 1 4 5 15 6 14 7 13 8 9 10 11 12 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13.
Operation NOTES: 1. Adobe Reader® software is required. 2. Ensure the logger is at room temperature before inserting it into a PC port. 3. The executable file for programming is named “PDF Logger Configuration Tool”. 4. A datalogging session cannot start until the datalogger is properly configured. Configuring the TH30 and RHT30 for a Datalogging session At any time before logging is started, the logger can be programmed and re‐ programmed.
Alarm Delay The preset alarm delay time for the Single Event Alarm mode is always zero. The adjustable delay time range for the Cumulative Alarm is 5 ~ 120 minutes. Alarm Modes Single Event Alarm mode: The LED immediately starts flashing red every 10 seconds when the measured value exceeds the alarm threshold. Cumulative Alarm mode: The LED begins flashing red only after the average value exceeds the alarm threshold and also after any programmed Alarm Delay time. See Alarm Delay parameter above.
Start Datalogging 1. Configure the logger as previously described and then hold the Start/Stop button for 5 seconds to start logging. 2. Measurements update on the display every 10 seconds. For the RHT30 the temperature and RH% displays toggle every 5 seconds. 3. If the logger is programmed with a Start Delay: After pressing and holding the Start/Stop button for 5 seconds to start logging, REC will appear on the LCD but will not flash until the delay time has elapsed and logging has begun. 4.
Specifications Display (LCD) 5‐digit LCD with multi‐function indicators Status indicator (LED) Dual color multi‐purpose LED (red/green) for active logging, alarms, and PC connection status Temperature Sensors NTC Thermistors (TH30/RHT30 internal temperature sensors and TH30 external temp. probe) Ext. Temperature probe length 2.1m (84”) (TH30) Temperature range ‐30 ~ 70oC (‐22 ~ 158oF) internal and external probes Temperature resolution 0.1oC/oF Temperature Accuracy ±0.5oC (0.
Maintenance Battery Replacement The battery compartment is located on the back of the datalogger as shown in the Descriptions section. When the battery symbol flashes on the display, replace the batteries promptly. 1. Using a large coin, rotate the battery compartment lid clockwise approximately one quarter turn to open the compartment 2. Replace the two (2) CR2032 batteries with positive (+) side facing up 3. Replace the battery compartment lid and turn counterclockwise to secure it 4.
