NEH Conductive Suspended Electrode Limit Switch

Brand: KOBOLD Instruments, Inc.

KOBOLD limit switches model NEH are used for level monitoring and pump control of conductive liquids. The instruments operate on the conductive principle.

A low a.c. voltage is applied between the conductive side of the tank or the earth electrode (longest electrode) and a switching point electrode.

If the conductive medium touches the electrodes, a negligible alternating current flows across the electrodes and the conductive medium to the electrode relay. Suspended electrodes are ideally suited for installation when space is at a premium.

The relay amplifies the alternating current and operates a switching relay or a pump controller. An electrode relay of type NE-104 is required per switch point for signaling.

For minimum/maximum control two switching point electrodes must be connected to the relay. Relay NE-304 operates as two single relays (NE-104).


Approvals & Certifications

  • CE

BSP Connection

  • G 1/2"
  • G 1-1/2"

Cable Length

  • 32.81 feet (10 metres) - PTFE Cable
  • 98 feet (30 metres) - NBR Cable

Cable Material

  • NBR
  • PTFE

Connection Material

  • Polypropylene
  • PTFE

Enclosure / Body Material

  • 316 Stainless Steel
  • Polyamide (PA)

Environmental Protection

  • IP65

Materials of Construction

  • 316Ti Stainless Steel - Electrodes
  • Hastelloy C - Electrodes
  • PVC - Electrodes
  • Titanium - Electrodes

Maximum System Pressure

  • psi: 87 (kPa: 600, bar: 6)

Operating Temperature

  • Maximum

Screw Material

  • Polypropylene
  • PTFE


  • 0.079" (2 mm) - PTFE Cable Diameter
  • 0.24" (6 mm) - NBR Cable Diameter

Supply Voltage

  • 110 Vac

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