1. Introduction
This manual provides essential information for the proper installation, operation, and maintenance of your Tyenaza HM-2D Digital Time Counter. Please read this manual thoroughly before using the device to ensure safe and efficient operation. Keep this manual for future reference.
2. Safety Information
Always observe the following safety precautions to prevent injury and damage to the device:
- Ensure the power supply voltage matches the specifications of the device (AC100-240V).
- Do not expose the device to extreme temperatures, humidity, or corrosive environments.
- Disconnect power before performing any installation, wiring, or maintenance.
- Only qualified personnel should perform electrical connections.
- Avoid physical impact or dropping the device.
3. Product Overview
The Tyenaza HM-2D is an 8-digit digital electrical time counter designed for various industrial and commercial applications. It features a clear LCD display and operates on AC100-240V. Its compact design allows for guide rail type installation.

Figure 3.1: Front view of the Tyenaza HM-2D Digital Time Counter, showing the LCD display and 'HOUR METER' label.

Figure 3.2: Back view of the Tyenaza HM-2D Digital Time Counter, displaying the model type (HM-2D), time range (0-999999H59M), and voltage (100-240VAC).
Key Features:
- 8-digit LCD display for precise time measurement.
- Wide voltage compatibility: AC100-240V.
- Timing accuracy: ±0.01.
- Low power consumption: 0.3 W.
- Guide rail type installation for easy integration.
- Accumulates time when energized; retains data upon power loss and resumes accumulation when power is restored.
4. Setup and Installation
The HM-2D Digital Time Counter is designed for guide rail installation. Follow these steps for proper setup:
- Power Disconnection: Ensure that the main power supply to the installation area is completely disconnected before beginning any work.
- Mounting: Securely attach the time counter to a compatible guide rail. The device features integrated clips for this purpose.
- Wiring: Connect the power supply wires to the terminals on the back of the HM-2D. Refer to the label on the device for correct voltage and polarity. Ensure all connections are tight and secure.
- Verification: Double-check all connections to ensure they are correct and safe.
- Power Connection: Restore power to the system. The counter should power on and begin displaying time.
Note: The device is designed to accumulate time when energized. There are no user-adjustable settings for time range or reset on the device itself.
5. Operating Instructions
The Tyenaza HM-2D Digital Time Counter operates automatically once installed and powered. It is designed for continuous time accumulation.
- Automatic Operation: When the device receives power (AC100-240V), it will automatically begin accumulating and displaying time.
- Time Display: The 8-digit LCD display shows the accumulated time in hours and minutes (h/m). The range is from 1 minute up to 999,999 hours and 59 minutes.
- Power Interruption: In the event of a power outage, the counter stops accumulating time. Upon restoration of power, it will resume accumulation from the last recorded value. The accumulated data is retained even when power is off.
- No User Reset: This model does not feature a manual reset function. The counter is intended for continuous, non-resettable time tracking.
6. Maintenance
The Tyenaza HM-2D Digital Time Counter requires minimal maintenance due to its robust design.
- Cleaning: Periodically wipe the display and casing with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Inspection: Regularly inspect the wiring connections to ensure they remain secure and free from corrosion.
- Environmental Conditions: Ensure the operating environment remains within the specified temperature and humidity ranges to prolong the device's lifespan.
7. Troubleshooting
If you encounter issues with your HM-2D Digital Time Counter, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Display is blank | No power supply or incorrect wiring. | Check power connections and ensure the voltage is within AC100-240V. Verify wiring is correct. |
| Time is not accumulating | Device is not receiving continuous power. | Ensure a stable and continuous power supply to the device. |
| Inaccurate time reading | Rare, but could be due to extreme environmental conditions or internal fault. | Verify operating conditions are within specifications. If problem persists, contact customer support. |
8. Specifications
| Parameter | Value |
|---|---|
| Model | HM-2D |
| Time Range | 8-digit, 1 minute - 999,999 hours 59 minutes |
| Voltage | AC100-240V 50/60Hz |
| Timing Accuracy | ±0.01 |
| Power Consumption | 0.3 W |
| Ambient Temperature | -10°C to 50°C |
| Relative Humidity | 35-85%RH |
| Installation Mode | Guide rail type |
| Protection Level | IP20 |
| Package Dimensions | 1.97 x 1.97 x 1.97 inches |
| Item Weight | 2.12 ounces |
9. Warranty and Support
For warranty information and customer support, please refer to the documentation provided with your purchase or contact your retailer. Keep your purchase receipt as proof of purchase.
For technical assistance or inquiries, please visit the official Tyenaza store on Amazon or contact their customer service directly.
Tyenaza Store Link: Visit the Tyenaza Store





