1. Introduction
The Voltcraft Gamma-Check-A is a portable Geiger counter designed for the quick and easy detection of radioactive radiation. This instrument allows users to measure radiation dose in microsieverts per hour (µSv/h) and assess the risk of radioactive contamination in various materials, including food. Its compact design and user-friendly interface make it suitable for both personal and professional use.
Please read this manual thoroughly before operating the device to ensure safe and correct usage.
2. Safety Instructions
- Always handle the device with care. Avoid dropping or subjecting it to strong impacts.
- Do not attempt to open or modify the device. Repairs should only be performed by qualified personnel.
- Keep the device away from extreme temperatures, humidity, and direct sunlight.
- Ensure proper battery installation and disposal according to local regulations.
- This device is an indicator of radiation levels and should not be used as a substitute for professional radiation safety equipment or procedures in critical environments.
3. Package Contents
Please check the contents of your package upon receipt. It should include:
- Voltcraft Gamma-Check-A Geiger Counter
- 9V Lithium Battery (if included in package)
- Instruction Manual
If any items are missing or damaged, please contact your supplier immediately.
4. Device Overview
Familiarize yourself with the components of your Gamma-Check-A device:
Figure 1: Front view of the Voltcraft Gamma-Check-A Geiger Counter, showing the display, control buttons (Up, Menu, Down, OK), and the "GAMMA CHECK" label.
- Display: Shows current radiation dose, messages, and battery status.
- Up Button (▲): Navigates up in menus or increases values.
- Menu Button: Accesses the device's settings and functions.
- Down Button (▼): Navigates down in menus or decreases values.
- OK Button (●): Confirms selections or powers the device on/off.
Figure 2: The Voltcraft Gamma-Check-A Geiger Counter held in a user's hand, demonstrating its ergonomic design and portable size for easy operation.
5. Setup
5.1 Battery Installation
- Locate the battery compartment cover on the back of the device.
- Open the battery compartment by sliding or unscrewing the cover.
- Insert a new 9V Lithium battery, ensuring the correct polarity (+/-) as indicated inside the compartment.
- Close the battery compartment cover securely.
Note: Use only 9V Lithium batteries for optimal performance and longevity. Remove the battery if the device will not be used for an extended period.
6. Operating Instructions
6.1 Power On/Off
- To Power On: Press and hold the OK button for approximately 2 seconds. The display will light up, and the device will begin its self-test.
- To Power Off: Press and hold the OK button for approximately 2 seconds until the display turns off.
6.2 Taking a Measurement
Once powered on, the device automatically starts measuring radiation levels. The current radiation dose rate will be displayed in µSv/h on the main screen.
- Position the device near the object or area you wish to measure.
- Allow a few seconds for the reading to stabilize. The device detects radiation in a short time.
- The display will show the real-time radiation dose.
6.3 Adjustable Alarm
The Gamma-Check-A features an adjustable alarm to alert you when radiation levels exceed a set threshold.
- Press the Menu button to enter the settings menu.
- Use the Up (▲) and Down (▼) buttons to navigate to the "Alarm Threshold" option.
- Press OK to select.
- Use the Up (▲) and Down (▼) buttons to adjust the desired alarm level.
- Press OK to confirm the setting.
- Exit the menu by pressing the Menu button repeatedly until you return to the main screen.
Note: When the radiation level exceeds the set threshold, the device will emit an audible alarm and/or visual alert.
6.4 Acoustic Decay Indicator
The device provides an acoustic indicator for radiation decay events, allowing for real-time auditory feedback on detected radiation particles.
- This feature is typically active by default. Refer to the menu settings to enable or disable it if desired.
- Each click or beep indicates a detected radiation event. The frequency of clicks corresponds to the intensity of radiation.
7. Maintenance
- Cleaning: Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Storage: Store the device in a cool, dry place when not in use. Remove the battery if storing for extended periods.
- Battery Replacement: Replace the 9V Lithium battery when the low battery indicator appears on the display.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | Battery is dead or incorrectly installed. | Check battery polarity. Replace with a new 9V Lithium battery. |
| Inaccurate or fluctuating readings. | Interference from other electronic devices; device not stable. | Move away from potential sources of electromagnetic interference. Ensure the device is held steadily. |
| Alarm sounds unexpectedly. | High radiation level detected; alarm threshold set too low. | Verify the environment for radiation sources. Adjust the alarm threshold in the menu if necessary. |
| Display is blank or unreadable. | Low battery; extreme temperature. | Replace battery. Move device to a suitable operating temperature. |
9. Specifications
| Model Number | Gamma-Check-A |
| Manufacturer | VOLTCRAFT |
| Part Number | 1034097 |
| Radiation Measurement Range | 0.01 – 999.9 µSv/h |
| Accuracy | ± 10% |
| Power Source | 9V Lithium Battery |
| Product Dimensions (L x W x H) | Approx. 180 x 86 x 45 mm |
| Weight | Approx. 160 g |
| Color | Grey |
| Recommended Use | Radiation Detection |
10. Warranty and Support
VOLTCRAFT products are manufactured to high-quality standards. For information regarding warranty terms, technical support, or service, please refer to the warranty card included with your purchase or visit the official VOLTCRAFT website.
For further assistance, please contact VOLTCRAFT customer service with your product model number (Gamma-Check-A) and purchase details.
