Kobold NEK-3173N20C – NEK Compact Conductive Level Switch, Relay Output, PPS Body, 73 mm, 3/4″ NPT
The Kobold NEK-3173N20C is a compact conductive level switch from Kobold’s NEK series. It has a PPS (Ryton) body, 73 mm stainless steel electrodes, a 3/4″ NPT process connection and a relay output with a floating changeover contact, with a 2 m (6 ft) PVC cable.
The potential-free changeover contact can switch an alarm, a solenoid valve or a pump contactor directly, or connect to any PLC input regardless of whether it is PNP or NPN. The NEK detects the level of conductive liquids by applying a low AC voltage to a pair of 316Ti stainless steel electrodes. When the liquid reaches the electrodes, a small current flows between them and the switch changes state. The 73 mm immersion length places the switch point further into the tank than the 36 mm version, which helps where the switch is fitted through a thicker wall, boss or adapter. With no moving or protruding parts, it is well suited to dirty liquids, liquids with high solids content, low-viscosity media and aggressive chemicals. The PPS body gives the higher pressure and temperature ratings in the NEK range, and the switch can be installed horizontally or vertically.
Key Technical Data – Kobold NEK-3173N20C
- Series: Kobold NEK compact conductive level switch
- Measuring principle: Conductive, no moving parts
- Housing: PPS (Ryton)
- Electrodes: Stainless steel 1.4571 (316Ti)
- Immersion length: 73 mm
- Process connection: 3/4″ NPT male
- Max. pressure: 20 bar (290 psig)
- Operating temperature: –25 to +85 °C (PPS body)
- Installation position: Horizontal or vertical
- Output: Relay, floating changeover contact (SPDT), max. 1 A / 30 V
- Supply voltage: 18–29 V DC
- Switching delay: 0.5 s (dry/wet and wet/dry)
- Sensitivity: approx. 50 kΩ
- Min. liquid conductance: approx. 100 µS/cm
- Electrical connection: 2 m (6 ft) PVC cable, 5-core unshielded
- Degree of protection: IP68
Choosing the Right NEK Version
- NEK-3173N20C: relay, PPS body, 73 mm (this item)
- NEK-3136N20C: 36 mm immersion length
- NEK-1173N20C / NEK-2173N20C: NPN / PNP open collector versions
- NEK-3273N20C: polypropylene body (max. 6 bar, +60 °C)
If the switch is installed in a metal tank, the tank must be connected to the NEK supply ground (GND). Our sales team can help you confirm the right version.
Typical Applications
- Direct switching of alarms, valves or pump contactors
- High and low level detection in small tanks
- Water, wastewater and process liquids with solids
- Aggressive or chemical media compatible with PPS and 316Ti
Buy Kobold NEK-3173N20C from Atlantech Drives
- Fast sourcing, shipped worldwide
- 12-month warranty
- Senior commercial advice on level switch versions and lead time
- Quick, no-obligation quotes: get a quote today
