FLSW Switch Model
The FLSW is a switch-equipped sensor where an internal PCBA replaces the customer's external drive and monitoring circuit. There are two variations of status reporting:
- Normally Open — Opens to ground, closes and conducts when out of fluid
- Normally Closed — Conducts when in fluid, opens when out of fluid
The 12V PCBA uses a 12 Ohm sense resistor while the 24V PCBA uses an 80 Ohm sense resistor.

FLSW 3-Wire

FLSW 4-Wire