© 2016 Littelfuse Protection Relays & Controls
Protection Relays
Pump Controls and Liquid Level Controls
www.littelfuse.com/pcxxxllccz-pcxxxllcgm
Rev: 1-A-062716
PC-XXX-LLC-CZ / PC-XXX-LLC-GM SERIES
Liquid level control
Wiring Diagram
Description
The PC-xxx-LLC-CZ and PC-xxx-LLC-GM Series are liquid
level control relays used to control conductive liquid pumping
operations in a pump-up or pump-down application. The units
come in two different voltage ranges (see specs below).
The units have an adjustable sensitivity knob (4.7k to 100k ohms)
that is set according to the resistance level at which you want the
probes (sold separately) to sense the conductive liquid. The units
have a built-in debounce time delay that prevents the relay from
energizing if the probe resistance momentarily goes above or
below the sensitivity setpoint (due to liquid splashing in the tank).
The units operate their internal relay based on inputs from a high
and low probe and a common reference (when a conductive tank
is used) or common probe (when a non-conductive tank is used).
PC-xxx-LLC-CZ
J
Compatible with Crouzet’s PNR & PNRU series liquid
level control
PC-xxx-LLC-GM
J
Compatible with Gems’ Series 16M general purpose control
Must use Model OT08PC or P1011-6 socket for UL Rating!
Note: Manufacturer’s recommended screw terminal torque for the OT Series Octal Sockets is
12 in.-lbs.
Features & Benefits
FEATURES BENEFITS
Debounce time delay
(2 seconds)
Prevents rapid cycling of the pump due to
turbulance in the tank
Adjustable sensitivity
(4.7 to 100Kohms)
Allows user to fine tune the sensing resistance to
prevent false tripping due to foam or debris
Dual probe design
(plus a common)
Allows user the ability to set the level
differential required
TYPICAL WIRING DIAGRAM FOR PC-XXX-LLC-CZ
TYPICAL WIRING DIAGRAM FOR PC-XXX-LLC-GM
Ordering Information
MODEL LINE VOTAGE DESCRIPTION
PC-100-LLC-CZ 95-120VAC
Compatible with Crouzet's PNR & PNRU
Series liquid level control
PC-200-LLC-CZ 190-240VAC
Compatible with Crouzet's PNR & PNRU
Series liquid level control
PC-100-LLC-GM 95-120VAC
Compatible with Gems' Series 16M
liquid level control
PC-200-LLC-GM 190-240VAC
Compatible with Gems' Series 16M
liquid level control
