PDI offers a broad, standard or customizable, line of highly reliable and UL approved conductance actuated liquid level controls.  They are primarily designed and approved for use in boiler and steam generator applications but can also be used as cost effective solutions in a wide array of liquid level control and alarming applications. The controls are most commonly used with conductivity probes for sensing liquid level, however, they can also automatically sense dry contact outputs from floats or switches. They provide reliable relay contact output(s) for interfacing with burner controls, heating elements, pumps, motors, contactors, solenoid valves, controllers, or audible/visual devices. The PDI Level Controls line has always been sold factory direct, offers many features as standard and includes the ability for OEM configuration and customization.

The products are proudly designed, supported, and Made in the USA. 

NEW, APPROVED & EXCLUSIVE TO PDI: Optional Manual Lockout Feature for Boilers now available with the LW products. It's designed to eliminate nuisance trips (ie; manual lock-outs) on Boilers that can occur and automatically recover within 90 seconds after tripping the Safety Low-Water Cutoff. Saves on costly shut-downs, service calls and allows the highest degree of burner safety protection using a fast 3 second shut down on the burner circuit after water falls off of the low water probe.  To learn more, click on the LW products below and send us a message to talk with our team! 

Featured

LW (Safety Low-Water Cutoff, Open)

The LW is a UL353 rated Safety Low-Water Cutoff designed and approved for use as a secondary LWCO for Boilers. The LW can also be used in a variety...

LW (Safety Low-Water Cutoff, Module)

The LW is a UL353 rated Safety Low-Water Cutoff designed and approved for use as a secondary LWCO for Boilers. The LW can also be used in a variety...

FW (Feed-Water Control, Open PCB)

The FW is a UL353 approved Feed-Water Control typically used with conductivity probes, floats or switches for interfacing with pumps, valves, conta...

FW (Feed-Water Control, Module)

The FW is a UL353 approved Feed-Water Control typically used with conductivity probes, floats or switches for interfacing with pumps, valves, conta...

FLW (Dual Function Control, Open PCB)

The FLW is a UL353 approved Dual Function Control that includes the features and functions of both the feed-water (FW) and the safety low-water (LW...

FLLW (Tri-Function Control, Open PCB)

The FLLW is a Tri-Function Control that includes a primary and secondary Low-Water Cutoff and one Feed-Water control in a single compact space and ...

Certifications
ISO9001, IEC80079-34,
ATEX, IECEx, FM, UL
Established 1991
Contact information
ProtoDesign, Inc.
50495 Corporate Drive,
Suite 106
Utica, MI 48315
Business Hours
Monday–Friday: 8 AM to 5 PM EST