CEM DT-191A Temperature and Humidity Data Logger User Manual

1. Introduction

The CEM DT-191A is a compact and efficient data logger designed for continuous monitoring of temperature and humidity. This device records environmental conditions over extended periods, storing the data internally. It features a direct USB interface for convenient data retrieval, allowing users to generate tamper-proof PDF reports or perform in-depth analysis using the provided software.

This manual provides essential information for the proper setup, operation, maintenance, and troubleshooting of your DT-191A data logger.

Figure 1: Front view of the CEM DT-191A Data Logger, showing the display and integrated USB connector.

Figure 2: The compact size of the DT-191A Data Logger demonstrated by being held in a hand.

2. Safety Information

Please read and understand all safety instructions before operating the device. Failure to follow these instructions may result in damage to the device or personal injury.

• Do not expose the device to extreme temperatures, direct sunlight, or high humidity for prolonged periods.
• Avoid dropping the device or subjecting it to strong impacts.
• Do not attempt to open or modify the device. Refer all servicing to qualified personnel.
• Dispose of batteries according to local regulations.
• Keep the device away from strong electromagnetic fields.

3. Package Contents

Verify that all items are present in the package:

• CEM DT-191A Temperature and Humidity Data Logger
• User Manual (this document)
• Analysis Software (typically provided via download or pre-loaded on the device for access upon connection)
• Lanyard (may be included for portability)

Figure 3: CEM DT-191A Data Logger shown with an attached lanyard for easy carrying.

4. Setup

4.1 Initial Power-Up and Configuration

1. Insert Battery: Ensure the battery is correctly installed. The device typically uses a long-life battery.
2. Connect to PC: Remove the protective cap from the USB connector and plug the DT-191A directly into an available USB port on your computer.
3. Software Installation (Optional for PDF): For basic PDF report generation, no software installation is required. The device acts as a USB flash drive. For advanced data analysis and graphing, install the provided analysis software from the device's virtual drive or a specified download link.
4. Configure Settings: Use the analysis software to set logging parameters such as sample rate (from 2 seconds to 24 hours), alarm thresholds for temperature and humidity, and start/stop modes.

Figure 4: Side view of the CEM DT-191A Data Logger, highlighting the integrated USB connector.

5. Operating Instructions

5.1 Starting Data Logging

Once configured via the software, disconnect the device from the PC. The data logger will begin recording according to the programmed settings. The LCD display will show current readings and may indicate logging status.

5.2 LCD Display

The LCD displays real-time temperature and humidity values. It also shows maximum and minimum recorded values during the current logging session. An alarm icon will appear if user-defined maximum/minimum values are exceeded.

5.3 Stopping Data Logging

Logging will stop automatically when the memory is full, or when manually stopped via the analysis software, or if configured for a specific duration.

5.4 Data Retrieval and Analysis

1. PDF Report Generation: Plug the DT-191A into any USB port on a computer. The device will automatically generate a tamper-proof PDF report containing a summary of the logged data, including graphs and statistics. This report is saved directly onto the device's internal memory, accessible as a removable drive.
2. Advanced Analysis with Software: For more detailed analysis, connect the device to a PC with the analysis software installed. The software allows for viewing data in graphical format, exporting to other formats (e.g., Excel), and further customization of reports.

Figure 5: Illustration of the data download options for the DT-191A, including direct PDF report generation and Excel export via software.

6. Maintenance

6.1 Battery Replacement

The DT-191A features a long battery life, typically up to 1 year with a 1-minute sample rate. When the battery indicator on the LCD shows low power, replace the battery with a new one of the same type. Refer to the battery compartment for specific battery type and replacement instructions.

6.2 Cleaning

Clean the device with a soft, dry cloth. Do not use abrasive cleaners or solvents. Ensure the USB port and sensor areas are free from dust and debris.

7. Troubleshooting

• Device not recognized by PC:
  • Ensure the USB connector is fully inserted.
  • Try a different USB port on your computer.
  • Restart your computer.
  • Check if the device's battery is sufficiently charged.
• No data logging:
  • Verify that logging was initiated correctly via the software.
  • Check if the memory is full.
  • Ensure the battery has sufficient power.
• Inaccurate readings:
  • Ensure the sensor area is not obstructed or dirty.
  • Avoid placing the device near heat sources, direct sunlight, or strong air currents.
  • Allow the device to stabilize in the environment for a few minutes before logging.

8. Specifications

Figure 6: The DT-191A Data Logger depicted in various industrial and commercial applications.

9. Warranty Information

CEM products are manufactured to high-quality standards. For specific warranty terms and conditions, please refer to the warranty card included with your product or contact CEM customer support. The warranty typically covers manufacturing defects for a specified period from the date of purchase.

10. Customer Support

If you encounter any issues or have questions regarding your CEM DT-191A Data Logger, please contact CEM customer support. Contact details can usually be found on the official CEM website or on the product packaging.

Manufacturer: CEM Instruments India