SR-AW/ERT weatherproof end-of-shaft slip rings, 63.5 mm rotor, optional encoder 10 to 36 circuits

SR10AW/AX: weatherproof ten-circuit end-of-shaft slip ring, 63.5 mm rotor

This end-of-shaft slip ring has ten gold alloy rings rated at 0.5 A, which carry strain gages, thermocouples, accelerometers and low voltages with a peak resistance variation of 0.1 Ω. Contacting rotary seals make it completely weatherproof. Its stainless steel rotor has a 63.5 mm (2.5 in) flange with a circular connector, and its anodized aluminum stator a radial circular connector. It runs up to 2 000 rpm, from −40 to 85 °C.

On installation, the rotor flange is screwed to the end of the shaft with 8-32 screws on a 57.15 mm (2.250 in) circle. Connector plugs are sealed at the rear with RTV silicone or a sealing backshell, whose tube can hold the stator against a wheel-well bracket.

SR10AW/E512/AX: ten-circuit end-of-shaft slip ring with a 512 ppr encoder

The SR10AW/E512/AX has ten gold alloy slip rings rated at 0.5 A, with a maximum peak resistance variation of 0.1 Ω, for strain gages, thermocouples and other sensors on rotating machinery. A 512 pulse-per-revolution optical encoder measures speed, angle and direction of rotation without using any ring. It gives outputs A and B in quadrature, an index pulse I and A⊕B, which doubles the resolution, as 0 to 5 V pulses that drive TTL loads, with an accuracy of 0.25° maximum cumulative error; it runs on 5 to 20 V DC, 100 mA. Contacting rotary seals make the assembly completely weatherproof, up to 2,000 rpm, with a running torque of 21 in-oz (0.148 N·m). The rotor is stainless steel and the stator anodized aluminum. The unit is 80 mm (3.15 in) long, weighs 397 g without mating connectors, and operates from −40 to 85 °C.

On the side of the stator is a Bendix PT02E-14-19P connector: contacts A to K carry the ten rings, P the encoder supply, R its ground, and S, T, U and V the outputs A, B, I and A⊕B. The axial connector on the back of the rotor is a Bendix PT02E-12-10S, with contacts A to K for the ten rings. The type A rotor flange is Ø 63.5 mm (2.499 in) and is screwed to the shaft end through eight holes for 8-32 screws on a Ø 57.15 mm (2.250 in) circle; an O-ring seals it. The stator has two tapped 8-32 holes, 1.218 in apart.

The SR10AW/T512/AX has the same body with tachometer electronics added, and the SR36AW/E512/AX carries 36 rings in a 115 mm body.

SR20AW/AX: weatherproof 20-circuit end-of-shaft slip ring, 63.5 mm rotor

This end-of-shaft slip ring has 20 gold alloy rings rated at 0.5 A, which carry strain gages, thermocouples, accelerometers and low voltages with a peak resistance variation of 0.1 Ω. Contacting rotary seals make it completely weatherproof. Its stainless steel rotor has a 63.5 mm (2.5 in) flange with a circular connector, and its anodized aluminum stator a radial circular connector. It runs up to 2 000 rpm, from −40 to 85 °C.

On installation, the rotor flange is screwed to the end of the shaft with 8-32 screws on a 57.15 mm (2.250 in) circle. Connector plugs are sealed at the rear with RTV silicone or a sealing backshell, whose tube can hold the stator against a wheel-well bracket.

SR20AW/E512/AX: 20-circuit end-of-shaft slip ring with a 512 ppr encoder

Twenty slip rings of gold alloy, each rated 0.5 A with a peak resistance variation of 0.1 Ω at most, sit between the ten of the SR10AW and the 36 of the SR36AW in the SR20AW/E512/AX. Speed, angle and direction of rotation come from a 512 pulse-per-revolution optical encoder that uses none of them: its outputs are A and B in quadrature, the index I and A⊕B, its cumulative error is 0.25° at most, and its supply is 5 to 20 V DC at 100 mA. With contacting rotary seals the assembly is completely weatherproof; the limit is then 2,000 rpm and the running torque 21 in-oz (0.148 N·m). Length is 93 mm (3.67 in) and weight 425 g without mating connectors (19 oz, 539 g, with them); the operating range is −40 to 85 °C.

Stator side: a 26-contact Bendix PT02E-16-26P, with contacts A to W for the 20 rings, X for the encoder supply, Y for its ground and Z, a, b, c for the outputs A, B, I and A⊕B. Rotor side: a Bendix PT02E-16-26S on the back of the flange, whose contacts X to c are not connected. The type A flange, Ø 63.5 mm (2.499 in), takes eight 8-32 screws on a Ø 57.15 mm (2.250 in) circle, and two tapped 8-32 holes, 1.218 in apart, are in the stator.

It is used for sensor counts between those of the SR10AW/E512/AX and the SR36AW/E512/AX, on wheels and shafts that stay within 2,000 rpm, the limit with contacting seals.

SR36AW/AX: weatherproof 36-circuit end-of-shaft slip ring, 63.5 mm rotor

This end-of-shaft slip ring has 36 gold alloy rings rated at 0.5 A, which carry strain gages, thermocouples, accelerometers and low voltages with a peak resistance variation of 0.1 Ω. Contacting rotary seals make it completely weatherproof. Its stainless steel rotor has a 63.5 mm (2.5 in) flange with a circular connector, and its anodized aluminum stator a radial circular connector. It runs up to 2 000 rpm, from −40 to 85 °C.

On installation, the rotor flange is screwed to the end of the shaft with 8-32 screws on a 57.15 mm (2.250 in) circle. Connector plugs are sealed at the rear with RTV silicone or a sealing backshell, whose tube can hold the stator against a wheel-well bracket.

SR36AW/E512/AX: 36-circuit end-of-shaft slip ring with a 512 ppr encoder

The SR36AW/E512/AX has 36 gold alloy slip rings rated at 0.5 A, with a maximum peak resistance variation of 0.1 Ω, where the SR10AW has ten and the SR20AW twenty. A 512 pulse-per-revolution optical encoder measures speed, angle and direction of rotation without using any ring, with outputs A, B, I and A⊕B and an accuracy of 0.25° maximum cumulative error; it runs on 5 to 20 V DC, 100 mA. Contacting rotary seals make the assembly completely weatherproof, up to 2,000 rpm, with a running torque of 21 in-oz (0.148 N·m). The unit is 115 mm (4.52 in) long, weighs 482 g without mating connectors, and operates from −40 to 85 °C.

The 55-contact stator connector on the side is a Bendix JT02RE-16-35P: contacts 1 to 36 carry the rings, 37 a 37th ring when possible, 38 to 43 the encoder ground, 50 the encoder supply, 51 its ground, and 52 to 55 the outputs A, B, I and A⊕B. The axial connector on the back of the rotor is a Bendix JT02RE-14-35S with 37 contacts. The type A rotor flange is Ø 63.5 mm (2.499 in), screwed to the shaft end through eight holes for 8-32 screws on a Ø 57.15 mm (2.250 in) circle.

It is used where many channels are recorded on a shaft or a wheel that stays within 2,000 rpm, the limit with contacting seals. For ten rings, see the SR10AW/E512/AX; for twenty, the SR20AW/E512/AX.