Watlow CV, LV Specifications

Basic Temperature and Limit Controllers

Basic Temperature
and Limit Controllers
Provide Economical
Solution for a Wide
Range of Applications

SPECIFICATION SHEET

The basic and limit microprocessor-based controllers from
Watlow® provide an economical solution for applications
requiring simple on-o control. These controllers and limits
are available in a broad range of packaging options, allowing
users to select the best version for their individual application.
The controllers and limits are available with or without an
operator interface and can be ordered in a 1/8 DIN square panel
mount, DIN-rail mount or open-board design congurations.

The basic and limit design provides significant improvements
in the performance, repeatability and accuracy offered by
analog basic temperature and limit controllers.

The variable options for the SERIES CV (controller) and
SERIES LV (limit) include an operator interface for viewing
and selecting the set point. A red, four-character, seven
segment LED displays the set point to show the process
option. The set point selection is made with a continuous
turn rotary encoder, or with discrete up/down cursor keys.
Operating range temperature values are customer definable
in the product configuration part number.

The fixed options for the SERIES CF (controller) and
SERIES LF (limit) offer fixed set points and are supplied
without an operator interface. Operating set point
temperature values are customer definable in the product
configuration part number. The SERIES TM temperature
indicator is available as an additional order option.

These basic and limit controllers are UL® recognized and
include CE approvals. The limit controllers are FM approved
with special UL® approval for the open-board potted versions.
CV and LV panel mount controllers ordered with discrete
up/down cursor keys include NEMA 4X/IP65 seal protection.
Watlow’s basic temperature and limit controllers include
industry leading service and support and are backed by a
three-year warranty.

Features and Benefits

Fixed or adjustable set points

• Provide tamper-proof operation

• Offer control flexibility

Four character LED display

• Improves set point selection accuracy

Multiple mounting options

• Minimize installation time

Heat or cool operation

• Provides application flexibility

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

• Meet certification requirements/compliance

Microprocessor-based technology

• Ensures accurate, repeatable control

Typical Applications

• Food preparation

• Industrial machinery

• Packaging

• Plastics processing

Specifications

On-Off Controller

• Microprocessor based, on-off control mode

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

• Input filter time: 1 second

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

• Internal front panel or external customer supplied
momentary reset switch

• Input filter time: 1 second

Operator Interface

•

Four digit, seven segment LED displays, 0.28 in. (7 mm) high

• °F or °C indicator LED

• Load/Alarm indicator LED

• Continuous turn, velocity sensitive rotary encoder for set
point adjustment

• Front panel key on push for set point or push for show
process options (on-off controller only)

• Front panel SET/RESET key on variable set point models
(limit controller only)

• No operator interface on fixed set point models

Standard Conditions For Specications

• 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 types

• >10 MΩ input impedance

• 250 nV input referenced error per 1Ω source resistance

RTD

• 2-wire platinum, 100Ω

• DIN curve (0.00385 curve)

• 125 µA nominal RTD excitation current

Input Accuracy Span Range

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

-200 to 0°C (-328 to 32°F)

•

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

Output Types
Switched dc (non-isolated, on-o controller only)

• 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

External Reset Switch (limit controller only)

• Momentary, dry contact closure

Agency Approvals

• CE a, W.E.E.E., RoHS EU Directive (2002-95-EC)

Agency Approvals (on-o controller only)

• UL® 873 recognized temperature controller and indicator,
File # E43684

• UL® 197 reviewed for use in foodservice appliances

• ANSI Z21.23 gas appliance thermostat approval

• Temperature control and indicator CSA 22.2 No. 24,
File # 30586

• NEMA 4X/IP65 (SERIES CV and LV panel mount
controllers with up/down cursor keys)

Agency Approvals (limit controller only)
SERIES LF (potted version only)

• UL® 991 recognized temperature limit for foodservice
industry

SERIES LV and SERIES LF (including potted version)

• UL® 873 recognized temperature regulator, File # E43684

• UL® 197 reviewed for use in foodservice appliances

• ANSI Z21.23 gas appliance thermostat approval

• CSA C22.2#24 approved temperature control,
File # 30586

• FM Class 3545 temperature limit switches, File # 3017239

Terminals

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

Power

• 24VAC +10%; -15%; 50/60Hz, ±5%

• 100 to 120VAC +10%; -15%; 50/60Hz, ±5%

• 200 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

Potted

DIN-rail

Square 1/8
DIN Panel

a

See declaration of comformity.

2.43 in.

(61.7 mm)

2.76 in.

(70.1 mm)

3.08 in.

(78.1 mm)

2.85 in.

(72.4 mm)

2.43 in.

(61.7 mm)

4.05 in.

(102.9 mm)

4.42 in.

(112.3 mm)

2.85 in.

(72.4 mm)

1.78 in.

(45.1 mm)

1.84 in.

(46.6 mm)

3.57 in.

(90.7 mm)

Behind panel

2.04 in.

(51.7 mm)

Ordering Information

Part Number

Indicator only, 4 character, 7 segment display

① ②

TM

③

Power
Supply④Package

⑤

Sensor

Type and

Scale

⑥ ⑦ ⑧ ⑨ ⑩ ⑪ ⑫ ⑬ ⑭

AAAAAAAAA

⑮

③

B = 120VAC

D = 230 to 240VAC

F = 24VAC

④

Panel mount, 1/8 DIN square - spade terminals

1 =

DIN-rail mount - spade terminals

2 =

Panel mount, 1/8 DIN square - screw terminals

5 =

DIN-rail mount - screw terminals

6 =

NEMA 4X panel mount, (spade terminals)

A =

NEMA 4X panel mount, (screw terminals)

C =

Power Supply

Package

Ordering Information

Part Number

Limit control with 8A relay output. Fixed set point, no user interface

① ②

LF

③

C = 120VAC
E = 230 to 240VAC

G = 24VAC

④

1 =
2 =
3 =
4 =
5 =
6 =
7 =

⑤

H =

J =
K =
L =

M =
N =

P =
R =
S =
T =

③

Power
Supply④Package

Panel mount, 1/8 DIN square - spade terminals
DIN-rail mount - spade terminals
Open, non potted - spade terminals
Potted case - spade terminals
Panel mount, 1/8 DIN square - screw terminals
DIN-rail mount - screw terminals
Open, non potted - screw terminals

Sensor Type and Scale

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

⑤

Sensor

Type and

Scale

Power Supply

Package

⑥

Limit

Type

⑦ ⑧ ⑨ ⑩

Fixed Set Point

Temp. Value

⑤

T/C Type J °F (-346 to 1900°F)

H =

T/C Type J °C (-210 to 1038°C)

J =

T/C Type K °F (-454 to 2500°F)

K =

T/C Type K °C (-270 to 1370°C)

L =

T/C Type T °F (-454 to 750°F)

M =

T/C Type T °C (-270 to 400°C)

N =

RTD °F (-328 to 1472°F)

P =

RTD °C (-200 to 800°C)

R =

T/C Type E °F (-328 to 1470°F)

S =

T/C Type E °C (-200 to 800°C)

T =

⑮

A =

Standard with Watlow logo

1 =

Standard without Watlow logo

⑪ ⑫ ⑬ ⑭

Overlay/

Custom
Options

Sensor Type and Scale

Overlay/Customs Options

⑮

AAAA

⑥

U = High limit manual reset
W = High limit auto reset

Y = Low limit manual reset
Z = Low limit auto reset

⑦

⑧⑨ ⑩

Note: An A (-) used in the left most digit of the xed set point
indicates a negative temperature value.

⑮

A =

Standard with Watlow logo

1 =

Standard without Watlow logo

Fixed Set Point Temperature Value

Limit Type

Overlay/Customs Options

Ordering Information

Part Number

Limit control with 8A relay output. Rotary set point adjustment, 4 character, 7 segment display, reset switch

① ②

LV

③

Power
Supply④Package

⑤

Sensor

Type and

Scale

⑥

Limit

Type

⑦ ⑧ ⑨ ⑩

Low Set Point

Operating

Range Value

⑪ ⑫ ⑬ ⑭

High Set Point

Operating

Range Value

⑮

Overlay/

Custom
Options

③

C = 120VAC

E = 230 to 240VAC

G = 24VAC

④

Panel mount, 1/8 DIN square - spade terminals

1 =

DIN-rail mount - spade terminals

2 =

Panel mount, 1/8 DIN square - screw terminals

5 =

DIN-rail mount - screw terminals

6 =

NEMA 4X panel mount, tactile keys (spade terminals)

A =

DIN-rail mount, tactile keys (spade terminals)

B =

NEMA 4X panel mount, tactile keys (screw terminals)

C =

DIN-rail mount, tactile keys (screw terminals)

D =

⑤

T/C Type J °F (-346 to 1900°F)

H =

T/C Type J °C (-210 to 1038°C)

J =

T/C Type K °F (-454 to 2500°F)

K =

T/C Type K °C (-270 to 1370°C)

L =

T/C Type T °F (-454 to 750°F)

M =

T/C Type T °C (-270 to 400°C)

N =

RTD °F (-328 to 1472°F)

P =

RTD °C (-200 to 800°C)

R =

T/C Type E °F (-328 to 1470°F)

S =

T/C Type E °C (-200 to 800°C)

T =

Power Supply

Package

Sensor Type and Scale

⑥

U = High limit manual reset

W = High limit auto reset

Y = Low limit manual reset
Z = Low limit auto reset

⑧⑨ ⑩

⑦

Note: An A (-) used in the left most digit of the xed set point
indicates a negative temperature value.

⑪

⑫⑬⑭

Note: An A (-) used in the left most digit of the xed set point
indicates a negative temperature value.

⑮

A =
1 =

Low Limit Set Point Operating Range Value

High Set Operating Range Value

Standard with Watlow logo
Standard without Watlow logo

Limit Type

Overlay/Customs Options

Ordering Information

Part Number

On-o controller, xed set point, no user interface

① ②

CF

③

B = 120VAC, switched dc output
C = 120VAC, 8A relay output
D = 230 to 240VAC, switched dc output
E = 230 to 240VAC, 8A relay output
F = 24VAC, switched dc output
G = 24VAC, 8A relay output

④

1 =
2 =
3 =
4 =
5 =
6 =
7 =

③

Power
Supply④Package

Panel mount, 1/8 DIN square - spade terminals
DIN-rail mount - spade terminals
Open board, non potted - spade terminals
Potted case - spade terminals
Panel mount, 1/8 DIN square - screw terminals
DIN-rail mount - screw terminals
Open board, non potted - screw terminals

⑤

Sensor

Type and

Scale

Power Supply

Package

Control

Type

⑥

⑦ ⑧ ⑨ ⑩

Fixed Set Point

Temp. Value

⑪ ⑫ ⑬ ⑭

⑮

Overlay/

Custom
Options

AAAA

⑤

T/C Type J °F (-346 to 1900°F)

H =

T/C Type J °C (-210 to 1038°C)

J =

T/C Type K °F (-454 to 2500°F)

K =

T/C Type K °C (-270 to 1370°C)

L =

T/C Type T °F (-454 to 750°F)

M =

T/C Type T °C (-270 to 400°C)

N =

RTD °F (-328 to 1472°F)

P =

RTD °C (-200 to 800°C)

R =

T/C Type E °F (-328 to 1470°F)

S =

T/C Type E °C (-200 to 800°C)

T =

⑥

H = Heat

C = Cool

⑦

⑧⑨ ⑩

Note: An A (-) is used in the left most digit of the set point
operating ranges to indicate a negative temperature value.Z

⑮

A =

Standard with Watlow logo

1 =

Standard without Watlow logo

Sensor Type and Scale

Control Type

Fixed Set Point Temperature Value

Overlay/Customs Options

Ordering Information

Part Number

On-o controller, rotary set point adjustment, 4 character, 7 segment display

① ②

CV

③

B = 120VAC, switched dc output
C = 120VAC, 8A relay output

D = 230 to 240VAC, switched dc output

E = 230 to 240VAC, 8A relay output
F = 24VAC, switched dc output

G = 24VAC, 8A relay output

④

1 =

2 =

5 =

6 =
A =
B =
C =
D =

⑤

H =

J =

K =
L =

M =

N =
P =
R =
S =
T =

③

Power

Supply④Package

⑤

Sensor

Type and

Scale

⑥

Control

Type

⑦ ⑧ ⑨ ⑩

Low Set Point

Operating

Range Value

Power Supply

Package

Panel mount, 1/8 DIN square - spade terminals
DIN-rail mount - spade terminals
Panel mount, 1/8 DIN square - screw terminals
DIN-rail mount - screw terminals
NEMA 4X panel mount, tactile keys (spade terminals)
DIN-rail mount, tactile keys (spade terminals)
NEMA 4X panel mount, tactile keys (screw terminals)
DIN-rail mount, tactile keys (screw terminals)

Sensor Type and Scale

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

⑪ ⑫ ⑬ ⑭

High Set Point

Operating

Range Value

⑥

⑮

Overlay/

Custom

Options

Control Type

H = Heat

C = Cool

⑦

⑧⑨⑩

Low Set Point Operating Range Value

Note: An A (-) is used in the left most digit of the set point operating
ranges to indicate a negative temperature value.

⑪

⑫⑬ ⑭

High Set Operating Range Value

Note: An A (-) is used in the left most digit of the set point operating
ranges to indicate a negative temperature value.

⑮

A =

Standard with Watlow logo

B =

Push to show process with Watlow logo

C =

Push to adjust set point with Watlow logo

D =

Show process push to adjust set point with Watlow logo

1 =

Standard without Watlow logo

2 =

Push to show process without Watlow logo

3 =

Push to adjust set point without Watlow logo

4 =

Show process push to adjust set point without Watlow logo

Overlay/Customs Options

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