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      Dwyer Instruments 478A-1 | Digital differential manometer | Range -60 to 60" w.c.
Positive, negative, or differential pressures can be measured with the Dwyer 478A differential pressure digital manometer. It contains nine English and metric units that may be selected instantly, one button auto zero, and accuracy of ±1.5% FS. The 478A is made to last because to its durable aluminum casing and auto power down feature, which extends battery life. Several pressure ranges are covered by this product line. The 476A is the only pressure model that is currently offered. A summary of each is given in the chart below.
- Specifications
 - Features
 - Downloads
 
| Accuracy | +/-1.5% FS @ 72°F (22.2°C). Includes linearity and repeatability | 
| Approvals | CE | 
| Connection | Process: For use with 3/16" or 1/4" I.D. tubing | 
| Display | 4 digit LCD (.425"H x .234"W digits) | 
| Material | Wetted: Consult factory | 
| Maximum Operating Pressure | 5 psig (.74 bar) | 
| Maximum operating temperature | 0 to 140°F (-17.8 to 60°C) | 
| Power | 9 V alkaline battery, installed non-functional, user replaceable | 
| PRESSURE | Hysteresis: +/-0.1% of FS | 
| Range | -60 to 60" w.c. | 
| Temperature | Compensated Temperature Limits: 32 to 104°F (0 to 40°C) | 
| Thermal Effect | 0.05% FS/°F | 
| Weight | 10.8 oz (306 g) | 
- Accuracy at full scale ±0.5%.
 - Durable aluminum extrusion housing.
 - Auto-zero function with one button.
 - Automatic shut-off feature to prolong battery life.
 - Select up to nine English/metric units instantly.
 
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