These digital vacuum regulators (DVR) are designed for precise measurement and control of vacuum at 300 mm Hg below atmospheric pressure. Unlike other vacuum regulators, the solid-state H-1741H and H-1741V Regulators use no mercury. Both units are identical except that one is a horizontal configuration and the other is vertical.
DVR meters display the amount of vacuum in mm/Hg or one of nine other units of measurement selected using a keypad on the meter.
In asphalt laboratories the digital vacuum regulator (DVR) may be used in conjunction with Cannon-Manning, Asphalt Institute, and Modified Koppers vacuum viscometers for measurement of highly viscous materials such as asphalt cement at 60°C (140°F) according to ASTM D 2171. The DVR is also useful in other laboratory systems where accurate measurement and control of vacuum is required.
Both the H-1741H and H-1741V are equipped with an internal vacuum pump and do not require an external vacuum source.
The internal set points for the instrument gauge are preset to regulate vacuum at 300 ± 0.5 mm Hg below atmospheric pressure (the vacuum required by ASTM D 2171). These set points may be altered to fit the user’s specific needs within the DVR’s operating range of 28 to 410 mm Hg below atmospheric pressure.
Reading accuracy: ±0.5mm HG. Operating temperature: 0 to 40°C (32 to 104°F). Upper/lower safety limit: 746mm HG below atmospheric pressure. Choice of horizontal: 18.5"w x 18"d x 6.75"h (470 x 457 x 171mm) or vertical: 6.75"w x 18"d x 18.5"h (171 x 457 x 470mm).
