The Watlow Series SD Limit Controller is a microprocessor-based safety device designed to prevent over- or under-temperature conditions in various industrial applications. Available in 1/32, 1/16, 1/8, and 1/4 DIN panel mount sizes, it accepts universal inputs from thermocouples, RTDs, or process inputs, providing flexibility across different systems. The controller features up to three outputs (two for the 1/32 DIN model), which can be configured as latching limits or alarms. Standard features include an IP65/NEMA 4X front panel rating, CE compliance, dual four-digit displays, and Factory Mutual (FM) approval, ensuring high safety and reliability standards. Advanced options such as Modbus® EIA-485 serial communications and infrared remote communication facilitate easy setup and monitoring. The Series SD Limit Controller is ideal for applications where thermal runaway could result in significant product loss, equipment damage, or safety hazards.
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| Manufacturer | Watlow |
| Product Name | Series SD Limit Controller |
| DIN Sizes | 1/32, 1/16, 1/8, 1/4 |
| Input Types | Thermocouples, RTDs, Process Inputs |
| Outputs | Up to 3 (2 for 1/32 DIN); configurable as latching limits or alarms |
| Front Panel Rating | IP65/NEMA 4X |
| Communications | Optional Modbus® EIA-485, Infrared Remote |
| Agency Approvals | FM, CE |