AMETEK, Inc. LNC-NS129-120 Sensor Resistance Board

AMETEK NCC LNC-NS129-120 is a dual-probe liquid-level resistance sensor that uses pump-down logic to drive a Form C SPDT relay, switching a connected load when the sensed resistance indicates the liquid level has fallen below the set point. The unit operates from a 120 VAC input (±10%), drawing up to 11 VA, and senses with a 15 VAC, up to 2 mA signal. Its sensing threshold is adjustable via a front-panel trim potentiometer over roughly 0.1–100 kΩ (+10%, -0%), enabling precise level detection with dual probes. The relay contacts are rated 10 A resistive at 120 VAC (5 A at 240 VAC), with a minimum 100 mA load at 5 VDC, and the device provides 1500 VAC isolation between the probe and other terminals. Mechanical terminations are 6-screw terminal blocks with four mounting holes (0.141" diameter); operating temperature range is -20°C to 55°C. This model, LNC-NS129-120, is part of AMETEK National Controls' Liquid Level Control Series for industrial and commercial equipment that uses resistance probes to monitor liquid levels. Optional accessories include a probe holder (LLH-11383-010) and various probe lengths (LLP-06.00-OSS, LLP-12.00-OSS, LLP-24.00-OSS) as well as a plastic-body probe assembly (LLP-001/2-011). Weight is listed around 0.55 lb for the NS129-120 assembly.