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DAYLIGHT SENSORS
GRX-CES SERIES
Installation and Setup Instructions 

Please Read

Description
the GrX-ces daylight sensors allow for changes to be made to a Lutron

®

 Lighting system through a contact 

closure, using a GrX-Lc8 controller, based on the amount of daylight available. there are 3 types of indoor 
sensors available, and 1 outdoor sensor. outdoor sensors are normally installed on the roof of a building. 

MoDeLs AVAiLABLe

Model #

Application

Detectable Light Range 
(foot-candles)

Factory Default Range 
(foot-candles)

Mounting method

GrX-ceso

outdoor  
(roof or wall)

0* to 750

250

1

2

 in (13 mm) conduit

GrX-cesi

indoor (ceiling)

0* to 750

100

Attach with adhesive tape 
(incuded)

GrX-cesA

indoor (atrium)

2* to 2500

1000

1

2

 in (13 mm) conduit

GrX-cess

indoor 
(skylight)

10* to 7500

2000

1

2

 in (13 mm) conduit

  * note: Minimum range corresponds to a setting below 1 on the Lc8 controller. please see the instructions for the 

Lc8 controller for light levels corresponding to tick marks on the Lc8 adjustment knobs.

power

•  Operating Voltage: 24 V

 iec peLV/nec

®

 class 2.

•  Operating Current: 40 mA nominal from 24 V

 supply.

•  Control Output: 0 – 10 V

 signal representative of ambient light present (input to Lc8 controller).

enVironMent

•  Designed to operate from 52 to 140 °F (11 to 60 °C).
•  All units are water-resistant and designed to withstand UV radiation.

DiMensions

GRX-CESI, GRX-CESA,  
GRX-CESS Indoor
GRX-CESO Outdoor

®

1.15 in

(29 mm)

1.28 in

(32.5 mm)

GRX-CESI

1.35 in

(34 mm)

1.85 in

(47 mm)

GRX-CESO

1.28 in

(32.5 mm)

2.25 in

(57 mm)

GRX-CESA or 

GRX-CESS

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