Watlow’s new SERIES LS offers fixed limit set point temperature values

As manufacturers are required to meet tighter safety

standards, Watlow has addressed this need with its new

SERIES LS safety limit. This new limit meets UL® 1998

and EN 60730 safety requirements and will shut down

a system to prevent damage to equipment or injury to

personnel.

Watlow’s SERIES LS is recommended for any application

where control failure could cause the temperature of

the application to continue to increase resulting in large

product scrap costs, damage to system equipment or

potential fire hazard.

The SERIES LS provides increased safety due to the use

of a factory fixed set point, factory fixed hysteresis and

the use of redundant temperature sensors to protect

against a single point sensor failure. Either sensor can

initiate an overtemperature limit condition along with a

deviation between sensors greater than the process

comparison value.

Watlow’s new SERIES LS offers fixed limit set point

temperature values that are customer definable in the

product configuration part number. It is available with

a potted module design configuration and push-on,

quick connect spade terminals to provide the electrical

connections.

Features and Benefits

Fixed limit set point

• Provides tamper-proof operation

• Offers control flexibility

Dual channel sensors

• Detects sensor faults

• Provides a fail-safe design

• Verifies firmware

• Prevents sensor deviation and sensor

placement errors

High-limit operation

• Provides application flexibility

Fahrenheit or Celsius operation

• Delivers application flexibility

Sensor break protection

• Offers positive system shutdown

Agency approvals

• Meets certification requirements/compliance

Microprocessor-based technology

• Ensures accurate, repeatable protection

Status notification

• Signals user of status with two integrated LEDs

• Provides health check signal to inform operator

that the process is working correctly

Three-year warranty

• Ensures product support and reliability

Typical Applications

• Foodservice equipment

• Industrial machinery

• Medical equipment

• Packaging equipment

• Plastics processing equipment

Specifications

Controller

• Microprocessor based, limit controller

• Customer defined hysteresis, model number

dependent

• High limit, factory selectable

• Automatic reset on power loss

• Input filter time: 1 second

Thermocouple Sensor Input

• Ungrounded

• Type J and K thermocouple types

• >10 MΩ input impedance

Input Accuracy Span Range

• Type J: 0 to 764°F (-18 to 406°C)

• Type K: 0 to 999°F (-18 to 537°C)

• Calibration accuracy: ±6°C, ±1° at standard conditions

and actual calibration ambient

• Temperature stability: ±0.3 degree per degree change

in ambient

Allowable Operating Ranges

• Type J: 32 to 626°F (0 to 330°C)

• Type K: 32 to 820°F (0 to 438°C)

Output Types

• Electromechanical relay, Form A, minimum load

current: 100mA, 8A resistive load, 120VA pilot duty,

120/240VAC maximum, inductive, electrical life 6,000

cycles at rated current

Terminals

• 0.25 in. (6.4 mm) quick connect, push-on terminals

Agency Approvals

• UL® / EN 60730-1, 2, 9 automatic electronic controls

for household and similar use. File #E43684

• UL® 1998 software review class B

• W.E.E.E.; CE – see Declaration of Conformity

• RoHS directive (2011-65-EU)

Power

• 100-240VAC +10%; -15%; 50/60Hz, ±5%

• 10VA maximum power consumption

• Data retention upon power failure via nonvolatile

memory

Environment

• Operating temperature: 32 to 158°F (0 to 70°C)

• Storage temperature: -40 to 185°F (-40 to 85°C)

• Relative humidity: 0 to 90% RH, non-condensing