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SERIES CV Microprocessor Temperature Controller

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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 an operator interface and can be ordered in a 1/8 DIN square panel mount or DIN-rail mount configuration.

The SERIES CV temperature controller incorporates a microprocessor design that delivers the repeatability, accuracy and performance advantages you can count on from Watlow’s basic temperature controllers.

The SERIES CV controller includes an operator interface for viewing and set point selection. A red, four-character, seven segment LED displays the set point to show process options. The set point selection is made with a continuous turn, rotary encoder. Operating range temperature values are user definable as specified in the product configuration part number.

SERIES CV 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.

Specifications · Features and Benefits


  • 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)
On-Off Controller
  • Microprocessor based, on-off control mode
  • Nominal switching hysteresis, typically 3ºF (1.7ºC)
  • Input filter time: 1 second
Operator Interface
  • Four digit, seven segment LED displays, 0.28 in. (7 mm) high
  • ºF or ºC indicator LED
  • Load indicator LED
  • Continuous turn, velocity sensitive rotary encoder for set point adjustment
  • Front panel key push for set point or push for show process options
Standard Conditions For Specifications
  • Rated line voltage, 50 to 60Hz, 0 to 90%, RH, non-condensing, 15-minute warm-up
  • Calibration ambient range: 77ºF (25ºC) ±3ºC
Sensor Input
  • Grounded or ungrounded
  • Type E, J, K or T thermocouple
  • >10 MΩ; input impedance
  • 250 nV input referenced error per 1Ω source resistance
  • 2-wire platinum, 100Ω
  • DIN-curve (0.00385 curve)
  • 125 μA nominal RTD excitation current
Input Accuracy Span Range

Type E: -328 to 1470ºF (-200 to 800ºC)
Type J: 32 to 1382ºF (0 to 750ºC)
Type K: -328 to 2282ºF (-200 to 1250ºC)
Type T: -328 to 662ºF (-200 to 350ºC)
RTD (DIN) -328 to 1472ºF (-200 to 800ºC)

Thermocouple Input
  • Calibration accuracy: ±1% of input accuracy span, ±1º at standard conditions and actual calibration ambient. Exception: Type T, ±2.4% of input accuracy span for -328 to 32ºF (-200 to 0ºC)
  • Temperature stability: ±0.3 degree per degree change in ambient
RTD Input
  • Calibration accuracy ±1% of input accuracy span ±1º at standard conditions and actual calibration ambient
  • Temperature stability: ±0.2 degree per degree change in ambient
Allowable Operating Ranges

Type E: -328 to 1470ºF (-200 to 800ºC)
Type J: -346 to 1900°F (-210 to 1038ºC)
Type K: -454 to 2500ºF (-270 to 1370ºC)
Type T: -454 to 750ºF (-270 to 400ºC)
RTD (DIN) -328 to 1472ºF (-200 to 800ºC)

Output Types
Switched dc (non-isolated)
  • Supply voltage max.: 24VDC into an infinite load
  • Supply voltage min.: 5VDC at 10mA
  • Min. load impedance: 500Ω
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® 50 IP65 - tactile key 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 158ºF (0 to 70ºC)
  • 0 to 90% RH, non-condensing
  • Storage temperature: -40 to 185ºF (-40 to 85ºC)

Features and Benefits

Adjustable set points
  • Offers control flexibility
Four character LED display
  • Improves set point selection accuracy
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


· Dimensions of DIN Rail & Square 1/8 DIN panel