Extech SDL200 Four-Channel Thermometer SD Logger Instruction Manual

1. Introduction

The Extech SDL200 is a versatile four-channel thermometer and data logger designed for precise temperature measurement and recording. It supports six types of thermocouples (J, K, E, T, R, S) and two channels for RTD (Pt100Ohm) probes, allowing for a wide range of applications. This device can display individual channel readings (T1, T2, T3, T4) or differential readings (T1-T2). It features an offset adjustment for relative measurements and can store up to 99 readings manually, with an extensive capacity of 20 million readings via a 2GB SD memory card. All recorded data is time-stamped and saved in an Excel-compatible format for easy transfer and analysis on a PC. The SDL200 also includes user-programmable sampling rates, Min/Max recording, Data Hold, Auto Power Off, and a built-in PC interface.

2. Safety Information

Please read and understand all safety instructions before operating the Extech SDL200. Failure to follow these instructions may result in injury or damage to the device.

• Do not operate the device if it appears damaged or if the insulation is compromised.
• Ensure proper probe connection before taking measurements.
• Avoid exposing the device to extreme temperatures, humidity, or direct sunlight.
• Use only specified battery types and ensure correct polarity during installation.
• Keep the device clean and dry. Refer to the maintenance section for cleaning instructions.
• Do not attempt to repair or modify the device. Refer all servicing to qualified personnel.

3. Package Contents

Verify that all items are present upon unpacking:

• Extech SDL200 Four-Channel Thermometer SD Logger unit
• 6 AA batteries
• Four general purpose Type K bead wire temperature probes
• SD memory card (2GB)
• Hard carrying case

Figure 3.1: Extech SDL200 unit with four Type K thermocouple probes inserted into the top ports. The display shows temperature readings for T1, T2, T3, and T4.

Figure 3.2: The retail packaging box for the Extech SDL200, displaying the brand logo, model name, and UPC code (0793950432105).

4. Product Overview

The SDL200 features a clear digital display and intuitive button layout for easy operation. The top of the device includes four input ports for thermocouple probes. The side of the device houses connectivity ports for power and PC interface, along with RTD probe inputs.

Figure 4.1: Side view of the Extech SDL200, illustrating the DC 9V power input, RS232 serial port for PC connection, and two RTD (PT100Ohm) probe input ports labeled PT1 and PT2, protected by a rubber flap.

Figure 4.2: A set of four yellow Type K bead wire temperature probes with standard mini-connectors, alongside a larger clamp-style temperature probe, demonstrating the variety of probes that can be used with the device.

5. Setup

5.1. Battery Installation

1. Open the battery compartment cover on the rear of the device.
2. Insert six (6) AA batteries, ensuring correct polarity as indicated inside the compartment.
3. Close the battery compartment cover securely.

5.2. Probe Connection

• For thermocouple probes (Type J, K, E, T, R, S), connect them to the four input jacks located at the top of the meter. Ensure the correct thermocouple type is selected in the device settings if applicable.
• For RTD (Pt100Ohm) probes, connect them to the PT1 and PT2 ports on the side of the device (refer to Figure 4.1).

5.3. SD Card Insertion

1. Locate the SD card slot, typically on the side or bottom of the device.
2. Insert the provided 2GB SD memory card into the slot until it clicks into place.
3. To remove, gently push the card inward until it springs out.

6. Operating Instructions

6.1. Power On/Off

Press the POWER button to turn the device on or off.

6.2. Basic Temperature Measurement

1. Connect the desired temperature probes.
2. Power on the device. The display will show real-time temperature readings for the connected channels (T1, T2, T3, T4).
3. Press the T1-T2 button to switch between individual channel display and differential temperature (T1-T2) display.

Figure 6.1: A technician utilizing the Extech SDL200 to monitor multiple temperature points on an HVAC system, demonstrating its application in industrial and scientific settings.

6.3. Data Logging

The SDL200 can record temperature data to the SD card with a real date and time stamp.

1. Set Sampling Rate: Use the SET button to access settings and adjust the sampling rate (1 to 3600 seconds).
2. Start Logging: Press the LOG button to begin recording data to the SD card. A logging indicator will appear on the display.
3. Stop Logging: Press the LOG button again to stop data recording.
4. Data Transfer: Remove the SD card and insert it into a computer to access the data, which is saved in Excel (.xls) format.

6.4. Min/Max and Data Hold

• Min/Max: Press the MAX/MIN button to display the maximum or minimum recorded temperature since the function was activated. Press again to cycle through Max, Min, and current readings.
• Data Hold: Press the HOLD button to freeze the current readings on the display. Press again to release.

6.5. Offset Adjustment

Use the OFFSET button to perform a zero function for relative measurements. Consult the full manual for detailed calibration procedures.

6.6. Auto Power Off

The device features an Auto Power Off function to conserve battery life. This can typically be disabled or adjusted in the settings menu if continuous operation is required.

6.7. PC Interface

The built-in RS232 PC interface allows for real-time data streaming and advanced control using compatible software (sold separately or available for download from Extech's website). Connect the device to your PC using an appropriate RS232 cable.

7. Maintenance

7.1. Cleaning

Wipe the device clean with a soft, damp cloth. Do not use abrasive cleaners or solvents. Ensure the device is dry before storage or further use.

7.2. Battery Replacement

Replace batteries when the low battery indicator appears on the display. Refer to Section 5.1 for battery installation instructions.

7.3. Storage

When not in use for extended periods, remove the batteries and store the device in its hard carrying case in a cool, dry place.

8. Troubleshooting

• Device does not power on: Check battery installation and ensure batteries are not depleted. Replace if necessary.
• Incorrect temperature readings: Verify probe connections are secure and that the correct probe type is selected (if applicable). Ensure probes are not damaged.
• Data logging not working: Check if the SD card is properly inserted and has sufficient free space. Ensure the logging function is activated.
• PC connection issues: Verify the RS232 cable connection and ensure the correct drivers and software are installed on your PC.

9. Specifications

10. Warranty and Support

Extech products are designed for reliability and performance. For warranty information, technical support, or service inquiries, please refer to the official Extech website or contact their customer service department. Keep your purchase receipt as proof of purchase for warranty claims.

For additional resources, visit the Extech Store on Amazon.