WATLOWCompact Loop System, Providing Powerful Control in a 1 /8 DIN Package

Watlow’s SERIES CLS200 is a powerful line of controllers, 

combining performance and flexibility with compact design. 

The 4, 8 and 16 loop versions provide complete controller 

solutions for a broad range of applications. Support for 

multiple types of sensor inputs is available, including 

thermocouples, RTDs, linear voltage, current and frequency. 

Each controller can operate as a stand-alone system, and 

includes built-in serial communications for computer interface 

and data acquisition. Optional programmable ramp and soak 

features allow complex batch processing and sequencing. 

An enhanced feature option offers cascade control, ratio 

control, differential control, process variable retransmit and 

remote analog set point.

The SERIES CLS200 controllers are UL® and C-UL® listed and 

meet the requirements of the European Community EMC 

Directive and carry the CE mark.

Features and Benefits

PID control of up to 16 heat and cool loops

• Minimizes panel space per loop 

• Reduces installation time

• Increases reliability: fewer parts means fewer failures

Auto-tune

• Requires less time tuning

• Achieves excellent control with less expertise

Menu-guided operation with full text display

• Allows quick setup of the controller

• Simplifies operation

Eight jobs stored and recalled

• Changes quickly from one process to another

Multiple and mixed inputs

• Accepts combinations of thermocouples, RTDs, linear 

dc voltage and linear dc current sensors

• Reduces learning curve and inventory

Sensor failure detection

• Reduces time troubleshooting reversed, shorted and 

open sensors

High/low process and deviation alarms for each input

• Integrates as needed to integrate with PLC and other 

control elements

34 digital outputs

• Provides flexible configuration

• Allows use of outputs as needed for control and alarms

EIA/TIA-232 and 485 communications

• Connects to software for easy configuration and operation

• Allows integration with controllers and software

DAC and SDAC Modules

The optional DAC and SDAC modules are available for

Watlow SERIES CLS200 controllers.

DAC

The DAC (digital to analog converter) converts one or two 

of the controller’s distributed zero crossing (DZC) output 

signals to analog signals. Each output is field configurable 

for 4-20mA(dc), 0-5VDC or 0-10VDC.

SDAC

The SDAC (serial digital to analog converter) converts 

one controller output to a precise analog voltage or 

current signal. The unit is typically used for process variable 

retransmit, open-loop control, motor or belt speed control, 

or phase-angle fired SCR power controllers. The SDAC bears 

the CE mark and is UL® and C-UL® listed.

Firmware Options

Choose firmware with the features needed for the 

application:

• Standard—includes closed-loop PID control, auto-tune, 

alarms, job memory and failed sensor detection.

• Ramp and soak—includes the standard firmware 

features with the addition of ramp and soak and process 

variable retransmit. Each channel can be configured for 

standard PID control or ramp and soak operation. Unused 

control outputs on any channel can be configured for 

retransmition.

• Enhanced features— includes the standard firmware 

features with the addition of process variable retransmit, 

remote analog set point, cascade control, ratio control 

and differential control algorithms. Each channel can be 

configured for standard PID controller or one of the other 

control algorithms. Each channel of cascade control or 

remote analog set point requires two controller channels. 

Unused control outputs on any channel can be 

configured for retransmit.

Because the SERIES CLS200 has no onboard analog 

outputs, applications that use process variable retransmit 

typically require one SDAC module per retransmitted 

signal.

CLS200 Specifications

Operator Interface

• 32-character vacuum fluorescent display 

• 8-key keypad to access guided menus and prompts, 

enter passkey sequence, set values, switch between 

single channel and multiple channel displays

• Controller configuration can be loaded through the 

standard serial port

Analog Inputs

• CLS204 4 differential

• CLS208 8 differential

• CLS216 16 single-ended 

Noise Rejection 

• 120dB at 60Hz

Temperature Coefficient 

• 40ppm/°C 

Sensors/Inputs

• Thermocouples: user-selectable type, direct connection, 

linearization, reference junction compensation, reversed 

and shorted thermocouple detection and upscale break 

protection with output averaging 

• RTD: (CLS204 and CLS208 only) 2- or 3-wire, platinum, 

100Ω @ 0°C, DIN 0.003850Ω/Ω/°C curve, user-selectable 

range. Two user-selectable ranges offer different 

resolutions. Requires scaling resistors. See special/linear 

inputs in ordering information.

• Linear: current and voltage signals from linear transmitters 

• Pulse input

Input Range and Accuracy 

Sensor Range (°F) Range (°C) Accuracy

Type B 150 to 3200°F 66 to 1760°C ±4.0°C

Type E -328 to 1448°F -200 to 787°C ±1.0°C