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

Type J -350 to 1400°F -212 to 760°C ±1.2°C

Type K -450 to 2500°F -268 to 1371°C ±1.3°C

Type R 0 to 3210°F -18 to 1766°C ±2.8°C

Type S 0 to 3200°F -18 to 1760°C ±2.8°C

Type T -450 to 750°F -268 to 399°C ±1.6°C

RTDs available on CLS204 and CLS208 only.

Sensor Range (°F) Range (°C) Accuracy

RTD1 -148 to 527˚F -100 to 275˚C ±1.1˚C

RTD2 -184 to 1544˚F -120 to 840˚C ±1.6˚C

Note: Accuracy @ 25˚C ambient. Valid for 10 to 100 percent 

of span except Type B, which is specified for 800˚F to 

3200˚F. RTD is for 100 percent of span.

Linear Voltage and Current Inputs

Requires scaling resistors. See special inputs in ordering 

information.

0-20mA(dc)/4-20mA(dc)

0-5VDC

0-10VDC

Other ranges available. Contact factory. 

Pulse Input 

• One TTL-level square wave input up to 2kHz

Input Sampling Rate at 60Hz 

Each channel has the following scans per second:

• CLS204: 6 samples per second (update time: 0.167 sec.)

• CLS208: 3 samples per second, (update time: 0.333 sec.)

• CLS216: 1.5 samples per second, (update time: 0.667 sec.)

Internal Measurement Resolution

• 0.006 percent, greater than 14 bits

Calibration

• Automatic zero and full scale

Digital Inputs 

• TTL-level used for selecting recipes or jobs, or R/S triggers

• 8 inputs and 1 pulse input with 50-pin terminal board 

option

• 2 inputs and pulse input or 3 inputs with 18-pin terminal 

block option

Digital Outputs

• 34 digital outputs are available with 50-pin terminal 

board option

• 10 control outputs with 18-pin terminal block option

• 1 or 2 control outputs are user assigned for each loop

• Each control output can be configured for on-off time 

proportioning, or distributed zero crossing

• Outputs sink up to 60mA each at 5VDC

• 350mA at 5VDC available from on-board supply 

Alarm Outputs 

• Independent process and deviation alarms for each 

channel

• Alarms can operate any output not used for control

• User-programmable deadband, delay and startup 

suppression

• Global alarm output activates when any alarm occurs

• Watchdog output indicates controller is functioning 

correctly

Serial Interface 

• EIA/TIA-232 or EIA/TIA-485 

Baud Rate

• 2400, 9600 or 19200, user-selectable

Communications Protocols

• Form of ANSI X3.28-1976, (D1, F1) compatible with 

Allen-Bradley PLC/2

• Modbus® RTU

Line Voltage/Power

• 15 to 24VDC ± 3VDC @ 1A (max.),

300mA (no load)

Agency Approvals

• UL®, C-UL® listed: UL®61010-1 safety requirements for 

measurement, control and laboratory equipment

• CE Mark: See Declaration of Conformity for details