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Product Introduction
In the dust-choked environment of a longwall mining face, a cylinder failing to sequence because of a missed sensor input can halt production for hours. The JEL SHR3158S-350-PM-01051 is engineered specifically to prevent that. It’s an inductive proximity sensor designed to embed directly into hydraulic rams, detecting the position of the piston through the steel wall.This isn’t a generic sensor; it’s built to survive the shock and vibration of continuous miners. Unlike photoelectric sensors that fog over, this inductive type ignores the coal dust. It features a robust 350 mm cable (the “-350” in the model) to reach the PLC input without needing extensions, which are failure points. If your machine is dropping pillars because the support legs aren’t locking, this is the component you need to check.
Key Technical Specifications
- Manufacturer: JEL (Joy Global / Johnstone)
- Model Number: SHR3158S-350-PM-01051
- Series: SHR3158S
- Type: Inductive Proximity Sensor
- Sensing Range: 350 mm (Cable Length)
- Output: 2-wire DC
- Connection: Integral Cable
- Thread Size: M18 x 1.5 (Typical for SHR series)
- Operating Voltage: 10-30 VDC (Standard for 2-wire inductive)
- Current Rating: 200 mA
- Housing Material: Brass / Stainless Steel (Durable for mining)
- Certification: MSHA Approved (Critical for underground use)
Application Scenarios & Pain Points
The time this sensor earns its price is when a $2 million shearer is sitting idle because the maintenance crew can’t figure out why the auto-tram function is disabled. Usually, it’s a fried sensor wire or a dead proximity switch.
- Underground Coal Mining: In longwall shields, these sensors detect if the chocks are fully advanced. If one fails, the whole face can’t pull the next cut.
- Continuous Miners: They monitor the boom lift and slew cylinders. Without accurate feedback, the machine can’t maintain grade control.
- Hydraulic Power Units: Used as limit switches on reservoirs or rams, telling the pump when to stop pressurizing.
- Heavy Construction Equipment: On large excavators or draglines where standard limit switches get ripped off, the flush-mount inductive type survives.
