1. Introduction
This manual provides comprehensive instructions for the safe and effective operation of your Gain Express THE-343 Dual Channel K/J Type Thermocouple Thermometer. This device is designed for precise temperature measurement across a wide range, suitable for various industrial, HVAC, laboratory, and general-purpose applications. Please read this manual thoroughly before use and retain it for future reference.
2. Safety Information
- Always handle the thermometer and probes with care.
- Do not expose the main unit to extreme temperatures, moisture, or direct sunlight.
- Ensure probes are correctly connected before taking measurements.
- Avoid bending or damaging the thermocouple wires.
- Do not use the device if it appears damaged.
- Keep out of reach of children.
- Dispose of batteries according to local regulations.
3. Package Contents
Verify that all items are present in your package:
- 1 x Gain Express THE-343 Thermocouple Thermometer
- 2 x Wired K-Type Thermocouple Probes
- 2 x Stainless Steel K-Type Thermocouple Probes
- 1 x Carrying Pouch
- 1 x English Instruction Manual
- 3 x AAA Batteries (pre-installed or included separately)
4. Product Overview
The THE-343 features a dual-channel display, allowing simultaneous measurement from two K or J type thermocouples. It includes various functions such as data hold, maximum/minimum/average readings, and high/low temperature alarms.
5. Setup
5.1 Battery Installation
- Open the battery compartment cover located on the back of the device.
- Insert three (3) AAA batteries, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.
5.2 Connecting Thermocouple Probes
- Identify the T1 and T2 input ports at the top of the thermometer.
- Insert the K-type or J-type thermocouple probes into the desired T1 and/or T2 ports. Ensure the connectors are fully seated.
- The device supports both single and dual-channel measurements.
6. Operating Instructions
6.1 Power On/Off
- Press the Power button () to turn the thermometer on.
- Press and hold the Power button for approximately 2 seconds to turn the thermometer off.
- The device features an Auto Power Off (APO) function, which will turn off the unit after 10 minutes of inactivity to conserve battery life. This can be manually canceled (refer to advanced settings in the included manual).
6.2 Switching Temperature Units (°C/°F)
- With the device powered on, press the HOLD/UNIT button to toggle between Celsius (°C) and Fahrenheit (°F).
6.3 Data Hold Function
- Press the HOLD/UNIT button briefly during measurement to freeze the current readings on the display. The "HOLD" indicator will appear.
- Press the button again to release the hold and resume live measurement.
6.4 MAX/MIN/AVG Measurement
- Press the MAX/MIN button to cycle through Maximum (MAX), Minimum (MIN), and Average (AVG) temperature readings for both T1 and T2 channels.
- Each press will display the next mode. The corresponding indicator (MAX, MIN, AVG) will appear on the LCD.
- To exit this mode and return to live readings, press and hold the MAX/MIN button for approximately 2 seconds.
6.5 Backlight Function
- Press and hold the MAX/MIN button for approximately 2 seconds to activate or deactivate the display backlight.
6.6 High/Low Temperature Alarm Setting
- Press the HI button to set the upper temperature limit for the alarm. Use the ADJ and Low buttons to adjust the value.
- Press the Low button to set the lower temperature limit for the alarm. Use the ADJ and HI buttons to adjust the value.
- When the measured temperature exceeds the set high limit or falls below the set low limit, the alarm will activate, and the backlight may change color (refer to Figure 6.1).
6.7 ADJ Compensation (Calibration)
The ADJ function allows for fine-tuning the temperature readings to compensate for minor discrepancies or specific probe characteristics. This is useful for achieving higher accuracy in critical applications.
- To enter ADJ compensation mode, refer to the detailed steps in the included physical instruction manual.
- Use the ADJ button to adjust the compensation value for T1 or T2.
- The compensation range is typically -9°C to 9°C (-15.3°F to 15.3°F).
7. Maintenance
7.1 Cleaning
- Wipe the main unit with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Ensure the device is dry before storage.
- Probes can be cleaned with appropriate sanitizers depending on their application (e.g., food-grade sanitizers for food use).
7.2 Storage
- Store the thermometer and probes in the provided carrying pouch when not in use.
- Keep in a cool, dry place away from direct sunlight and extreme temperatures.
- Remove batteries if the device will not be used for an extended period to prevent leakage.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | Dead or incorrectly installed batteries. | Check battery polarity, replace with new AAA batteries. |
| Inaccurate readings. |
|
|
| Display shows "OL" or "---". | Temperature out of measurement range or open circuit in probe. | Ensure temperature is within specified range. Check probe connection and integrity. |
| Alarm not functioning. | Alarm limits not set or alarm function disabled. | Set high/low alarm limits as described in section 6.6. Ensure alarm is enabled. |
9. Specifications
| Model | THE-343 |
| Measurement Range | -200°C to 1372°C (-328°F to 2501°F) |
| Accuracy (Main Unit) | ±0.2% + 0.7°C |
| Resolution | 0.1°C/°F (for -100°C to 999.9°C); 1°C/°F (for ≥1000°C) |
| Wired K-Type Probe Accuracy | ±2.5% (-20°C to 200°C) |
| Stainless Steel K-Type Probe Range | -50°C to 700°C (-58°F to 1292°F) |
| Display | LCD, 4 digits (37 x 41 mm screen size) |
| ADJ Compensation Range | -9°C to 9°C (-15.3°F to 15.3°F) |
| Sampling Rate | 1 time/second |
| Auto Power Off | 10 minutes (can be canceled manually) |
| Power Supply | 3 x AAA 1.5V Batteries |
| Product Dimensions | 152mm (5.98") x 55mm (2.16") x 33mm (1.29") |
| Weight | 580g (1.28 lbs) |
| Included Components | Thermometer, 4 Thermocouple Probes, Carrying Pouch, Manual, Batteries |
10. Applications
The Gain Express THE-343 Thermocouple Thermometer is suitable for a wide range of applications, including but not limited to:
- HVAC system diagnostics and maintenance
- Laboratory research and experiments
- Food service and cooking (e.g., BBQ, oven temperature monitoring)
- Industrial process monitoring
- Refrigeration equipment testing
- Aquarium temperature monitoring
11. Warranty and Support
Gain Express products are manufactured to high-quality standards. For warranty information, technical support, or service inquiries, please refer to the contact details provided in the original product packaging or visit the official Gain Express website. Please retain your proof of purchase for warranty claims.
