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Thermo Fisher Scientific Alpha TDS 200 User Manual

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Appendix 3: External Relays

The relays on the TDS 200 series controller are rated for 6 amps at 110 VAC and can be
wired directly to your final control element (provided its power requirements do not
exceed this). However, to preserve the life of your controller, or if higher power is
needed, it is recommended that you use the controller relay to drive an external relay.

Diagram below shows a typical installation. Wiring should be changed appropriately if
normally closed (N.C.) operation is desired.