1. Introduction
The HT629 Nuclear Radiation Detector is a compact and portable personal dosimeter designed for accurate detection of X-ray, Γ-ray, and Β-ray radiation. This device is suitable for various applications including industrial, medical, and food radiation detection, providing real-time and cumulative dose measurements. This manual provides essential information for the safe and effective use of your HT629 detector.
2. Product Overview
2.1 Key Features
- Multiple Measurement Units (µSv/h, mR/h, cps, cpm)
- High-Definition Large Screen for clear readings
- Data Hold function to freeze current readings
- Multiple Alarms (Backlight: Green/Red, Buzzer)
- Compact and Portable design
- Low Voltage Warning for battery status
- Automatic Power Off function
2.2 Instrument Panel
Familiarize yourself with the various components and controls of the HT629 detector:
- Status Indicator Light: Provides visual feedback on device status.
- Display Screen: Shows measurement readings, units, and device status.
- Power On/Off Button: Used to turn the device on or off.
- Data Hold Button (HOLD): Freezes the current reading on the display.
- Measurement Range Selection Button (UNIT): Cycles through different measurement units (µSv/h, mR/h, cps, cpm).
- Buzzer On/Off Button: Toggles the audible alarm.
- Measurement Type Selection Button (MAX/AVG/ACC): Selects between Maximum, Average, and Accumulated value display modes.
3. Setup
3.1 Battery Installation
- Locate the battery compartment on the back of the device.
- Open the battery compartment cover.
- Insert three (3) 1.5V AAA batteries, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.
Note: Batteries are not included with the product and must be purchased separately.
4. Operating Instructions
4.1 Power On/Off
- To power on: Press and hold the Power On/Off Button until the display illuminates.
- To power off: Press and hold the Power On/Off Button until the display turns off. The device also features an auto power-off function.
4.2 Taking Measurements
- Ensure the device is powered on.
- Position the detector in the area where radiation measurement is required.
- The display will show real-time radiation dose equivalent rate.
4.3 Unit Switching
- Press the UNIT Button to cycle through available measurement units: µSv/h, mR/h, cps, and cpm.
4.4 Data Hold Function
- Press the HOLD Button to freeze the current reading on the display.
- Press the HOLD Button again to release the hold and resume real-time measurements.
4.5 Displaying Maximum, Average, and Accumulated Values
- Press the MAX/AVG/ACC Button to switch between displaying the maximum, average, or accumulated radiation values since the device was last reset or powered on.
4.6 Alarm Functions
- The device provides visual (Green/Red backlight) and audible (buzzer) alarms when radiation levels exceed preset thresholds.
- To toggle the buzzer sound, press the Buzzer On/Off Button.
5. Maintenance
- Keep the device clean and dry. Use a soft, damp cloth for cleaning; do not use abrasive cleaners or solvents.
- Avoid exposing the device to extreme temperatures, humidity, or direct sunlight.
- If the device will not be used for an extended period, remove the batteries to prevent leakage.
- Store the device in its protective bag when not in use to prevent damage.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on | Low or dead batteries; Incorrect battery installation | Replace batteries; Check battery polarity |
| Inaccurate readings | Interference from other electronic devices; Device not calibrated | Move away from interference sources; Contact support for calibration information |
| Alarm not sounding | Buzzer is turned off | Press the Buzzer On/Off Button to activate the buzzer |
| Low battery indication | Batteries are low | Replace all three AAA batteries |
7. Specifications
| Parameter | Value |
|---|---|
| Type of Detection Rays | Β-rays, Γ-rays, X-rays |
| Detector | Energy Compensation GM Tube (Geiger Counter Meter) |
| Dose Equivalent Rate | 0.00-50000 µSv/h (50 mSv/h) |
| Cumulative Dose Equivalent | 0.00 µSv-5000 mSv |
| Energy Range | 48 keV-1.5 MeV ≤± 30% (for 137Cs-) |
| Sensitivity | 80 CPM/µSv |
| Real-time Accuracy | ≤± 15% (below 100 µSv/h); ≤± 20% (above 100 µSv/h, below 1000 µSv/h); ≤± 25% (above 1000 µSv/h) |
| Unit Switching | µSv/h, mR/h, cps, cpm |
| Data Hold | Yes |
| Low Battery Indication | Yes |
| Backlight Alarm Prompts | Green/Red |
| Buzzer Alarm Prompts | Yes |
| Buzzer On/Off | Yes |
| Maximum Value Display | Yes |
| Average Value Display | Yes |
| Accumulated Value Display | Yes |
| Auto Power Off | Yes |
| Product Size | 142 × 58 × 28 mm |
| Product Weight | 167 g |
| Power Supply | 3 x 1.5V AAA batteries |
8. User Tips
- For consistent readings, ensure the device is held steady during measurement.
- When testing materials like marble, allow sufficient time for the detector to stabilize and provide an accurate reading.
- Always check the battery level before critical measurements to avoid interruptions.
9. Warranty and Support
This product comes with a standard manufacturer's warranty. For any technical support, warranty claims, or service inquiries, please refer to the contact information provided by your retailer or the manufacturer's official website. Keep your purchase receipt as proof of purchase.
