Watlow Basic Temperature and Limit Controllers

Basic Temperature and Limit Controllers Provide Economical

Solution for a Wide Range of Applications

The basic and limit microprocessor-based controllers from

Watlow® provide an economical solution for applications

requiring simple on-off 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 configurations.

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 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 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