Place of Origin:
GE Masoneilan digital positioner satellite SVI Series Digital Valve Positioner with display and Hart Communication
The 496 Series devices are used for indicating positions in the stroke of a control valve on which they are mounted. The detection can be either on-off, in which the housing is fitted with micro-switches or proximity detectors, or continuous, in which the housing is fitted with an opto-electronic unit. Both functions, on-off and continuous, can be combined. These devices may be mounted on rotary valves such as Camflex* II, MiniTork* II, or V-Max*, or on linear motion valves such as the series 21000 and 41005. The body and cover are made of epoxy-painted anodized aluminum. These devices can be explosion-proof and dust- and water-tight in accordance with ATEX 94/9/EC Directive. Some of them are intrinsically safe. (See the following pages for details.) The absence of mechanical contact in the proximity detectors and the opto-electronic position transmitters produces • almost complete insensitivity to vibrations and electrical interference, • very low operating friction, • virtually infinite operating life.
|Place of Origin||America|
|Diagnostics||5 Pressure Sensors|
|Materials||Case/Cover: - Aluminum ASTM 360|
|Welded||BW or SW|
|Operating Temperature||Standard Temperature|
|Screwed||NPT 1/4" through 2" (20 through 50 mm)|
|Body Materials||Cast iron PFA lined|
|Actuators||Model 35 spring-opposed rolling diaphragm|
|Trim||Eccentric rotary plug|
Internal components for the limit switch and position transmitter are mounted inside an IP66/IP67 enclosure. Performances of position transmitter type 496-857 or 496-857/. and 496-858 or 496-858/. • Output signal: 4-20 mA (2 wires) • Acceptable span on the command axle: from 25° to 90° for rotary or reciprocating valves • Rotation: clockwise or counterclockwise • Linearity: ≤ ± 0.5% for a rotary angle of 25° to 90° (typically ± 0.3% for a rotary angle ≥ 60°) • Hysteresis: ≤ 0.1% • Dead band: ≤ 0.1% • Repeatability: ≤ 0.1% • Total drift in temperature: 0.02 %/°C or 200 ppm/°C (zero and span range) • Operating temperature range: -40°C to +80°C Electrical characteristics and temperature range of the position transmitter with micro-switch(es) or proximity switch(es) are given in the following sections.
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