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NEH Conductive Suspended Electrode Limit SwitchBrand: 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
- G 1/2"
- G 1-1/2"
- 32.81 feet (10 metres) - PTFE Cable
- 98 feet (30 metres) - NBR Cable
Enclosure / Body Material
- 316 Stainless Steel
- Polyamide (PA)
Materials of Construction
- 316Ti Stainless Steel - Electrodes
- Hastelloy C - Electrodes
- PVC - Electrodes
- Titanium - Electrodes
Maximum System Pressure
- psi: 87 (kPa: 600, bar: 6)
- 0.079" (2 mm) - PTFE Cable Diameter
- 0.24" (6 mm) - NBR Cable Diameter
- 110 Vac