Key Features
- Highly sensitive aneroid pressure sensor for accurate atmospheric pressure measurement
- Mechanical or quartz-driven clockwork for reliable chart rotation
- Records on a 7-day or 30-day paper chart for continuous weather monitoring
- Robust marine-grade construction resistant to corrosion, humidity, and vibration
- Clear glass or acrylic lid for easy reading without opening the case
- Bulkhead or desk mounting options for flexible placement on the bridge
- Complete with chart paper, ink pen, and instruction manual
- Suitable for both commercial ships and recreational yachts
Technical Specifications
| Specification | Details |
|---|---|
| Type | Barograph |
| Sensor | Aneroid cell |
| Pressure Range | 950 to 1050 hPa / mbar |
| Accuracy | ±1 hPa |
| Chart Duration | 7 days or 30 days (model dependent) |
| Drive | Quartz or mechanical clockwork |
| Recording Pen | Replaceable fiber-tip pen |
| Casing Material | Brass, aluminum, or marine-grade plastic |
| Dimensions | Approx. 300 mm × 150 mm × 200 mm |
| Weight | 2.5 to 3.5 kg (model dependent) |
| Mounting | Bulkhead or desk stand |
| Included Accessories | Chart paper (1 roll), ink pen, instructions |
Frequently Asked Questions
How does a marine barograph work?
A barograph uses an aneroid cell that expands and contracts with changes in atmospheric pressure. This movement is transferred through a lever system to an arm with a pen, which records a continuous line on a rotating paper chart, giving a visual history of pressure changes.
What is the difference between a barometer and a barograph?
A barometer shows the current atmospheric pressure reading, while a barograph records pressure over time on a chart. Barographs are used to detect trends in pressure, which is crucial for predicting weather changes at sea.
Do I need to calibrate the barograph regularly?
Yes, like any precision instrument, a barograph should be checked against a known accurate barometer periodically. Calibration may involve adjusting the pen zero position or the aneroid scale. Most units have an adjustment screw for fine-tuning.
What is the typical duration of a chart paper roll?
Most standard marine barographs use a roll of chart paper that lasts either 7 days or 30 days, depending on the model. Some units offer switchable speed for different recording durations.
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