Voltage * 

Cord Lenght


Model LC-1

Download LC-1 Installation Instructions

Download LC-1 Brochure

The combination of any two Harwil liquid level switches and an electronic control module mounted in a weather-resistant box provide a ready-to-go system for the automatic filling or emptying of tanks or vessels.

System is composed of:

  • Electronic Latching/Unlatching Control Module
  • Special electronic module design eliminates false starts due to turbulent wave action.
  • Nema 4 weather resistant box with two standard 1/2″ seal tight flexible conduit fittings.
  • A secondary 10 amp SPDT relay output is also provided.
  • Color coded with ring and labeled terminal strip.
  • 120 or 240 VAC 50/60 Hz models available.
  • 30 amp DPST motor contactor output for driving 1 1/2 (120 VAC)/3 HP (240 VAC) pumps.

Choose from any two Harwil liquid level switch models.

  • Models for clean or contaminated fluids such as water, sea water, sewage, thin slurries, contaminated ground water, etc.
  • Models for strong acids, bases, hydrocarbons, alcohols, inorganics, ketones, esters or ethers.
  • Each system is provided with a complete, descriptive parts list and an installation and wiring diagram for both level switches and control module.
  • Maintenance and check out requires only a standard multimeter.
  • LC-1 Control Module is delivered pre-wired and is ready to hook-up to control your liquid level.


Electronic Latching Control Module Specifications:

Operating Voltage (Input)

  • Voltage: 120 or 230 VAC
  • Tolerance: ±15%
  • Frequency: 50/60 Hz


  • Electromechanical relay
  • Form: Single pole double throw, isolated
  • Rating: 10 AMPs resistive at 240 VAC


  • Transient Protected
  • Dielectric Breakdown: 1500 volts RMS minimum between input, output and probe.


  • Operating Temperatures: -20°C to +55°C
  • Storage Temperatures: -20°C to +55°C
  • Coating: Printed circuit board is conformal coated to resist moisture and corrosion.

Motor Contactor Specifications

Operating Coil

  • 120 VAC or 208-240 VAC 50/60 Hz
  • Inrush: 31 VA
  • Continuous use: 7 VA
  • Pickup: 90 VAC (120 VAC Coil)
  • 170 VAC (208-240 VA Coil)
  • Coil Insulation: Class B
  • Coil Connections: Double Male 1/4″ quick connect
  • Maximum Ambient Temperature: 155°F

Output Power Contacts

  • Type: DPST – Normally Open
  • Contact rating per pole:


Terminal Strip – 812 Series

Electrical Rating

  • Rated voltage – 1600 Volts RMS
  • Current rating – 30 AMPS

Wire Size

  • Will accommodate lugs for wire sizes AWG #14 to 12


  • Screws and terminals – brass, nickel plated
  • Solder terminals – brass, hot-tinned

Molded Material

  • G.P. phenolic (94V-0).

UL Recognized – UL File No. E47811 CSA File No. 21356

Control Box

Rain resistant type 3R UL listed J&P Box 312J P/N 70233A



Complete operating instructions, mechanical and electrical installation drawing and a numbered parts list is supplied with each unit.

How to order:

Four items are required to order a complete control system:

  • Basic Model Number: LC-1
  • Level Switch Model Number: Choose from 15 standard models.
  • Length of cable in feet between control module and liquid level switches. Standard cable is 1/4″ O.D. SVJ 18-2/90°C UL listed. Note: if customer is to supply cable, enter “O”
  • Operating Voltage.


There are no reviews yet.

Be the first to review “HARWIL LC-1 CONTROLLER”

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.