Watlow CLS208

Product Introduction

DIN rail mount eight-channel industrial safety limit and PID temperature controller manufactured by Watlow Electric Manufacturing Company, scaled expansion variant of CLS204 hardware platform. Provides eight fully isolated independent thermal zone monitoring, over-temperature safety trip protection, and closed-loop PID temperature regulation for multi-zone industrial heating and thermal processing equipment.

Category: Others

Description

Structural Characteristics

Enclosure material: Flame-retardant glass-filled polycarbonate industrial housing
Form factor: Standard width vertical DIN rail unit
Terminal segmentation: Split terminal blocks for sensor inputs, control relay outputs, DC power supply, and alarm common circuits
Front panel interface: 8 dual-digit LED temperature readouts, channel alarm status LED array, navigation parameter adjustment pushbuttons
Internal isolation architecture: Independent galvanic isolation barrier for every individual measurement channel
Dimensions: 112 mm (H) × 52 mm (W) × 108 mm (D)
Net weight: 0.78 kg

Technical Specifications

Channel Capacity: 8 fully isolated independent temperature measurement and control channels
Supported Temperature Sensors: Type J, K, T, N, S, R thermocouples; Pt100 3-wire RTD sensors
Full Measurement Range: -200 °C to +1768 °C (sensor type dependent calibration range)
Channel Output Hardware: Form A mechanical relay, 3 A resistive load continuous rating per channel
Control Modes: On/Off temperature regulation, PID closed-loop regulation, independent high/low safety limit trip
Temperature Readout Resolution: 0.1 °C precision for all sensor input types
Supply Power Requirement: 24 V DC nominal control power, 20 V DC to 30 V DC operating input window
Channel Isolation Voltage Rating: 1500 V DC galvanic isolation between all adjacent measurement channels
Ambient Operating Temperature: 0 °C to +50 °C convection-cooled cabinet environment
Safety & EMC Certifications: FM Approved safety limit device, UL, CE, RoHS compliant

Functional Features

Eight-channel fully isolated measurement architecture eliminates cross-channel thermal signal interference in dense multi-zone heating systems
Per-channel configurable high temperature safety limit with latching fault relay output and manual reset interlock
Universal auto-tune PID algorithm adaptive to slow and fast thermal mass process loads
Continuous open/short sensor fault detection with dedicated channel alarm indication for broken thermocouple/RTD wiring
Global alarm common relay output to aggregate all eight channel fault signals for PLC/HMI remote monitoring
All process setpoints, limit thresholds, and PID gain parameters stored in non-volatile flash memory with infinite power-off retention
Front panel channel navigation buttons for direct local parameter editing without host software connection

Working Principle

Internal multiplexed isolated signal conditioning circuitry sequentially samples temperature sensor signals from all eight measurement channels at uniform 200 ms global scan cycle intervals. Each channel’s raw sensor signal is converted to calibrated engineering temperature units and displayed on corresponding front-panel LED readout. On-board microcontroller executes independent PID control loops for every thermal zone, calculating

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