Watlow Series EHG CL User Manual
Features, Integrated temperature control
The Series EHG CL is a powerful instrument that in-
tegrates a temperature process controller, high-low tem-
perature alert, and power switching with a safety high
limit that meets UL
®
1998 and CE 60730 requirements.
The optional display and communications modules can
be easily upgraded in the field to provide a digital dis-
play, adjustable control parameters, RS-485 MODBUS
communications and other interface features. The com-
pact design, inherent reliability and integrated safety
limit functions make this control a tremendous value.
The control is designed for easy integration with Wat-
low heaters providing additional value to simplify the
engineering and component count on new equipment.
CE compliance and UL recognition will reduce time and
costs necessary for global agency testing and validation
for OEMs.
Features
Standard Base Module
• Two, type K thermocouple inputs: process temperature
controller and safety limit
• Process temperature output: 10 amp “NO ARC” relay
• Safety limit: 10 amp relay
• On-off and PID temperature control algorithm: Up-
graded via communications to PID algorithm (minimum
cycle time 5 seconds)
0600-0091-0000 Rev. A
September 2012
Integrated Temperature Control
• Standard Molex Connectors
• Dimensions
Configuration
Width
Depth
Height
Basic unit
88.8 mm
(3.496 in)
40.2 mm
(1.582 in)
55.8 mm
(2.196 in)
Control with mounting
bracket
88.8 mm
(3.496 in)
48.4 mm
(1.907 in)
55.8 mm
(2.196 in)
Control with communi-
catons-display module &
mounting bracket
88.8 mm
(3.496 in)
63.6 mm
(2.503)
55.8 mm
(2.196 in)
Optional Communications Module
• Field adjustable set point
• Access to PID parameters
• Modbus RTU Communications
• RS-485
• 3-character, 7-segment LED display
• User Interface Software
The Series EHG CL User’s Guide is copyrighted by
Watlow Winona, Inc., © September 2012, with all rights
reserved.
Patent Pending
Watlow Winona
1241 Bundy Boulevard
Winona, MN 55987
Phone: (507) 454-5300; Fax: (507) 452-4507
http://www.watlow.com
Series EHG CL
Integrated Temperature Controller
User’s Guide