Dwyer Durablock Series 250-AF Inclined Manometer Air Filter Gauge, 0.10-0-1.0 inH2O Measuring Range, 5-1/2" Inclined Scale

The Dwyer Durablock 250-AF inclined manometer with red gauge fluid has 0.10-0-1.0 Pa measuring range, built in zero level and molded plastic case for monitoring air filter performance. Red and green signal flags indicate when a filter requires changing. Red gauge fluid is freeze-proof and has lower evaporation rate for use in cold environments, and produces expanded scale viewing for improved reading resolution. The manometer can be used in ambient temperatures of -20 to +150 degrees F. The built-in zero level provides linear calibration. The manometer one-inch thick solid acrylic plastic housing is resistant to breakage and provides distortion-free measurements. The fluid bore is drilled to + or - 0.0002" to ensure accuracy. The built-in glass spirit level simplifies leveling, and is encapsulated to prevent tampering. Leakproof O-ring seals and safety traps reduce the risk of fluid loss. The manometer can be mounted on any horizontal surface using set screws.

H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.

Manometers measure the pressure of a liquid or gas. They are used in laboratory, medical equipment, engineering, automotive, and heating, ventilation, and air-conditioning applications. Manometers measure any combination of gauge, absolute, or differential pressures. Gauge pressure is the amount of pressure in a system relative to the ambient pressure, absolute pressure is the amount of pressure in a system relative to an absolute vacuum, and differential pressure is the difference between two pressures. Analog manometers are composed of columns of liquid, and they use gravity and the liquid's density to calculate pressure. Because they have no moving parts, analog manometers do not require re-calibration. Digital manometers have pressure sensors that are connected to a system with a hose to provide a digital readout of the amount of pressure present in a system. They use microprocessors to calculate pressure, and they require periodic calibration to help ensure accuracy.

Dwyer Instruments manufactures measurement and control instruments, including pressure gauges, flow meters, level instrumentation, temperature instrumentation, and air quality monitors. The company, founded in 1931, is headquartered in Michigan City, IN.