Product Overview
The GraLab Model 300 is a versatile 60-minute electromechanical timer designed for precision timing in various applications, including photography darkrooms, laboratories, and manufacturing settings. It features a large, luminous dial for easy readability in low-light conditions and dual hands for setting both minutes and seconds. The timer includes two integrated outlets for automated control of connected devices, such as an enlarger or a safety light.
Figure 1: GraLab Model 300 Photography and Darkroom Timer. This image shows the front view of the timer, highlighting its large, easy-to-read dial with luminous numerals and hands, the central setting knob, and the power cord.
Key features include a robust nonconductive plastic case with rubber base pads for protection against impact, chemicals, moisture, and electrical shock. Its precise electric motor ensures high accuracy, and an adjustable volume alarm signals the end of the timed cycle.
Safety Information
Please read and understand all safety instructions before operating the GraLab Model 300 timer. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- Electrical Safety: Ensure the timer is connected to a grounded electrical outlet with the correct voltage (100-130 VAC, 50 or 60 Hz, or 210-250 VAC, 50 Hz as specified for your model). Do not overload the outlets; the maximum capacity is 600 watts.
- Placement: Place the timer on a stable, level surface. Avoid placing it near water or in excessively humid environments. The nonconductive case provides protection, but direct exposure to liquids should be avoided.
- Handling: Use the recessed handle for easy gripping when moving the timer. Avoid dropping the unit.
- Maintenance: Disconnect the timer from the power source before cleaning or performing any maintenance.
- Children: Keep out of reach of children. This device is not a toy.
Setup
- Unpacking: Carefully remove the GraLab Model 300 timer from its packaging. Inspect the unit for any signs of damage.
- Placement: Choose a stable, dry location for the timer. The rubber base pads help prevent slipping and protect surfaces. For wall mounting, use the keyholes located on the back of the unit.
- Power Connection: Plug the timer's power cord into a suitable grounded electrical outlet.
- Device Connection: Connect your enlarger, printer, or other timed device to one of the two outlets located on the back of the timer. Connect your safety light to the other outlet. The timer is designed to switch power between these two outlets automatically based on the timing cycle.
Operating Instructions
The GraLab Model 300 timer is designed for straightforward operation. Familiarize yourself with the dial and controls before use.
Setting the Time
- The timer features a 60-minute dial with markings for both minutes and seconds.
- To set the desired time, rotate the central knob. The two hands allow for precise setting: one hand for minutes and the other for seconds.
- For film processing, you may set the timer by minutes. For enlarging, you can set it by seconds, or a combination of minutes and seconds for longer exposures.
Power and Outlet Control
- The timer has a POWER switch (ON/OFF) to control the main power to the unit.
- The two outlets on the back of the timer are designed for automatic switching. When the timer is running, power is supplied to one outlet (e.g., for an enlarger). Upon completion of the timed cycle, power automatically switches to the second outlet (e.g., for a safety light).
- Ensure the total wattage of connected devices does not exceed 600 watts.
Buzzer Operation
- The timer is equipped with an automatic alarm buzzer that sounds at the end of the timed cycle.
- The buzzer volume is adjustable. Locate the BUZZER knob on the front panel to adjust the sound level to your preference.
Maintenance
Proper care and maintenance will ensure the longevity and optimal performance of your GraLab Model 300 timer.
- Cleaning: Disconnect the timer from the power source before cleaning. Use a soft, damp cloth to wipe the exterior. Do not use abrasive cleaners or solvents, as these may damage the plastic case or luminous dial.
- Storage: When not in use, store the timer in a clean, dry environment, away from extreme temperatures and direct sunlight.
- Inspection: Periodically inspect the power cord for any signs of damage (fraying, cuts). If damage is found, discontinue use and contact customer support.
Troubleshooting
If you encounter issues with your GraLab Model 300 timer, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Timer does not power on. | Not plugged in; power switch is OFF; faulty outlet; damaged power cord. | Ensure power cord is securely plugged in. Turn POWER switch to ON. Test outlet with another device. Inspect power cord for damage. |
| Timer runs but connected device does not receive power. | Device not properly connected; device is faulty; timer outlet overloaded. | Ensure device is securely plugged into the timer's outlet. Test device by plugging it directly into a wall outlet. Verify total wattage does not exceed 600W. |
| Buzzer is too quiet or too loud. | Buzzer volume not adjusted correctly. | Adjust the BUZZER knob on the front panel to the desired volume level. |
| Timer hands do not move or are inaccurate. | Internal mechanism issue; timer not reset. | Ensure the timer is properly set and started. If the issue persists, the unit may require professional servicing. Do not attempt to open the casing. |
If troubleshooting steps do not resolve the issue, please contact GraLab customer support for assistance.
Specifications
| Attribute | Value |
|---|---|
| Model Number | 300 |
| Brand | GraLab |
| Timer Capacity | 60 Minutes |
| Face Diameter | 6.5 inches |
| Accuracy | ±0.015% |
| AC Outlet Power Rating | 600 watts at 120 VAC |
| Input Voltage | 100 to 130 VAC, 50 or 60 Hz; 210 to 250 VAC, 50 Hz |
| Dimensions (H x W x D) | 7.5 x 7.5 x 2.5 inches |
| Weight | 3.0 lb |
| Material | Polycarbonate |
| Certifications | UL, ULC |
Warranty and Support
GraLab products are manufactured to high standards of quality and reliability. While specific warranty details are not provided in this manual, please retain your proof of purchase for any warranty claims.
For technical support, service, or inquiries regarding your GraLab Model 300 timer, please contact GraLab customer service. Contact information can typically be found on the manufacturer's official website or on the product packaging.
Manufacturer: GraLab
Headquarters: Centerville, OH, USA
For the most current support information, please visit the official GraLab website.
