Watlow CF Series On-Off Controller

Features and Benefits:

Fixed set points

• Provides tamper-proof operation

Multiple mounting options

• Minimizes installation time

Heat or cool operation

• Provides application flexibility

Fahrenheit or Celsius operation with indication

• Offers application flexibility

Agency approvals

• Meets certification requirements/compliance

Microprocessor based technology

• Ensures accurate repeatable control



Watlow’s family of microprocessor-based temperature controllers offers an economical solution for applications that require simple, on-off control. Controllers are available in a broad range of packaging options, allowing selection of the best version for a specific application. They are available with or without an indicating display and can be ordered in a 1/8 DIN square panel mount, DIN-rail mount or open board design configuration.

The SERIES CF temperature controller incorporates a microprocessor design that delivers the repeatability, accuracy and performance advantages you can count on from Watlow’s basic temperature controllers. Fixed set points are available and an indicating display is an option. Operating set point temperature values can be specified in the product configuration part number.

SERIES CF controllers are UL® and C-UL® listed and carry CSA and CE approvals. Watlow’s temperature controllers include industry-leading service and support and are protected by a three-year warranty.



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Watlow CF Series On-Off Controller is available to buy in increments of 1

Watlow CF Series On-Off Controller




On-Off Controller

• Microprocessor based, on-off control mode

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

• Input filter time: 1 second


Operator Interface

• 4-digit, 7-segment LED displays, 0.28 in. (7 mm) high non-condensing, 15-minute warm-up

• °F or °C indicator LED


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


• Grounded or ungrounded

• Type E, J, K or T thermocouple

• >10 M# input impedance

• 250 nV input referenced error per 1# source resistance


• 2-wire platinum, 100#

• DIN-curve (0.00385 curve)

• 125 μA 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

• 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)

• Temperature stability: ±0.3 degree 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 degree 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

Switched dc (non-isolated)

• Supply voltage max.: 24VDC into an infinite load

• Supply voltage min.: 5VDC at 10mA

• Min. load impedance: 500#

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

Agency Approvals

• UL® 60730-1 Recognized Temperature Controller and Indicator on potted models

• UL® 197 Reviewed for Use in Cooking Appliances

• UL® 873

• ANSI Z21.23 Gas Appliance Thermostat Approval

• Temperature Control and Indicator CSA 22.2 No. 24



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



• 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)



• 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
2.85 in.
(72.4 mm)
2.85 in.
(72.4 mm)
Behind panel
2.04 in.
(51.7) mm


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