The Electro-Sensors SG1000C is a resolver-based single-turn rotary position monitor that converts shaft angle to a proportional 4–20 mA output. Designed for repetitive rotary applications in harsh environments, it mounts directly to the end of a rotating shaft via a 3/8"-16 UNC threaded connection and retains position data through power cycles via non-volatile memory.

How does the 4–20 mA position output work?

The SG1000C maps shaft rotation linearly: 4 mA = 0° (home position) and 20 mA = 359° (full turn). Any intermediate angle produces a proportional current between these endpoints with 512-position resolution and ±0.2% full-scale accuracy. Calibration is a simple procedure to set the home reference point. The standard 3-conductor shielded cable (10 ft) connects directly to a PLC analog input card with a 250–500 Ω load resistance — no signal conditioning required.

What hazardous area and environmental ratings apply?

The SG1000C is certified for Class I Division I (Groups C, D) and Class II Division I (Groups E, F, G) hazardous locations. Its NEMA 4X cast aluminum enclosure provides protection against dirt, dust, grease, and water ingress, with an operating temperature range of -40°C to +65°C (-40°F to +149°F). A flexible conduit-mounted stabilizer bracket is recommended for installations subject to vibration or incidental contact.

How does the SG1000C integrate with PLCs and display units?

The 4–20 mA loop connects directly to any standard PLC analog input. For local indication, Electro-Sensors offers the PM500 Process Meter and TR400SGA Remote Display — both provide 24 VDC loop power, user-scaled digital readout, relay alarm outputs, and a mirrored 4–20 mA pass-through for simultaneous PLC integration. The SG1000C works on both powered and manually driven shafts, making it adaptable to motorized and hand-operated equipment alike.