Watlow LF Series Basic Limit Controller

Features and Benefits:

Fixed set points

• Provides tamper-proof operation

Multiple mounting options

• Minimizes installation time

High or low limit with auto or manual reset

• Provides application flexibility

Fahrenheit or Celsius operation with indication

• Offers application flexibility

Sensor break protection

• Provides positive system shutdown

Agency approvals

• Meets certification requirements/compliance

Microprocessor based technology

• Ensures accurate, repeatable control


 

SERIES LF:

Watlow’s family of microprocessor-based limit controllers provide an economical solution for applications requiring temperature limit control. Limits are available in a broad range of packaging options, allowing selection of the best version for an individual application. Controllers are available without an operator interface and can be ordered in square 1/8 DIN-panel mount, DIN-rail mount or open board design configurations.

The SERIES LF limit family incorporates a microprocessor design platform. This design provides significant improvements in the performance, repeatability and accuracy offered by Watlow’s current line of analog basic temperature controllers.

The SERIES LF limit offers fixed set points and can be supplied with or without an operator interface. Operating set point temperature values are customer defined in the product configuration part number.

The LF limit controllers are factory mutual (FM) approved with special UL® approval for the open board potted versions. Watlow’s limit controllers include industry leading service and support and are protected by a three-year warranty.


 

 

$135.00

Maximum number of characters: 4

Watlow LF Series Basic Limit Controller is available to buy in increments of 1

Watlow LF Series Basic Limit Controller

 

Specifications:

 

Limit Controller

• Microprocessor based, limit controller

• Nominal switching hysteresis, typically 3°F (1.7°C)

• High or low limit, factory selectable

• Latching output requires manual reset upon over or under temperature condition

• Manual or automatic reset on power loss, factory selectable

• External customer supplied momentary reset switch

• Input filter time: 1 second

 

Standard Conditions For Specifications

• Rated line voltage, 50 to 60Hz, 0 to 90% RH non-condensing, 15-minute warm-up

• Calibration ambient range: 77°F (25°C) ±3°C

 

Sensor Input

Thermocouple

• Grounded or ungrounded

• Type E, J, K, T thermocouple

• >10 M# input impedance

• 250 nV input referenced error per 1# source resistance

RTD

• 2-wire platinum, 100#

• DIN-curve (0.00385 curve)

• 125μA nominal RTD excitation current

 

Input Accuracy Span Range

Type E: -328 to 1470°F (-200 to 800°C)

Type J: 32 to 1382°F (0 to 750°C)

Type K: -328 to 2282°F (-200 to 1250°C)

Type T: -328 to 662°F (-200 to 350°C)

RTD (DIN) -328 to 1472°F (-200 to 800°C)

 

Thermocouple Input

  1. • Calibration accuracy: ±1% of input accuracy span, ±1° at standard conditions and actual calibration ambient. Exception: Type T, ±2.4% of input accuracy span for -328 to 32°F (-200 to 0°C)
  2. • Temperature stability: ±0.3° per degree change in ambient

 

RTD Input

• Calibration accuracy ±1% of input accuracy span ±1° at standard conditions and actual calibration ambient

• Temperature stability: ±0.2° per degree change in ambient

 

Allowable Operating Ranges

Type E: -328 to 1470°F (-200 to 800°C)

Type J: -346 to 1900°F (-210 to 1038°C)

Type K: -454 to 2500°F (-270 to 1370°C)

Type T: -454 to 750°F (-270 to 400°C)

RTD (DIN) -328 to 1472°F (-200 to 800°C)

 

Output Types

Electromechanical Relay, Form C

• Min. load current: 100mA

• 8A @ 240VAC or 30VDC max., resistive

• 250VA pilot duty, 120/240VAC max., inductive

• Use RC suppression for inductive loads

• Electrical life 100,000 cycles at rated current

External Reset Switch

• Momentary, dry contact closure

 

Agency Approvals

SERIES LF (potted version only)

• UL® 991 recognized temperature limit for cooking industry

• UL® 60730-1

SERIES LF (including potted version)

• UL® 873 recognized temperature regulator

• UL® 197 reviewed for use in cooking appliances

• UL® 991

• ANSI Z21.23 gas appliance thermostat approval

• CSA C22.2 #24 approved limit control

• FM Class 3545 temperature limit switches

• RoHS, W.E.E.E.

 

Terminals

• 0.25 in. (6.3 mm) quick connect, push on terminal or removable screw terminals

 

Power

• 24VAC +10%; -15%; 50/60Hz, ±5%

• 120VAC +10%; -15%; 50/60Hz, ±5%

• 230 to 240VAC +10%; -15%; 50/60Hz, ±5%

• 10VA max. power consumption

• Data retention upon power failure via nonvolatile memory

 

Operating Environment

• 32 to 158°F (0 to 70°C)

• 0 to 90% RH, non-condensing

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

 

Dimensions

• DIN-rail model can be DIN-rail or chassis mount DIN-rail spec DIN 50022, 1.38 in. x 0.30 in. (35 mm x 7.5 mm)

  

 

Style Width Height Depth
Open Board 2.43 in.
(61.7 mm)
2.43 in.
(61.7 mm)
1.78 in.
(45.1 mm)
Potted 2.76 in.
(70.1 mm)
4.05 in.
(102.9 mm)
1.84 in.
(46.6 mm)
DIN-rail 3.08 in.
(78.1 mm)
4.42 in.
(112.3 mm)
3.57 in.
(90.7 mm)
Square 1⁄8
DIN-panel
2.85 in.
(72.4 mm)
2.85 in.
(72.4 mm)
Behind panel
2.04 in.
(51.7) mm

 


More Information
Manufacturer
Watlow
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