SPR-110 Pulse Isolation Relay
The SPR-110 pulse isolation relay is designed to provide ten sets of isolated solid state Form C (KYZ) dry-contact outputs from a single field-selectable Form A or C input over a wide voltage range. The SPR-110 relay contains standard-duty solid state outputs. The sense voltage provided by the SPR-110 to the sending device (typically a meter) is +13 VDC. The SPR-110 may be used with meters having high or low voltage semiconductor outputs, or electro-mechanical output contacts (relays).
The SPR-110 relay has a switch-selectable Form A or Form C input and input filtering circuitry to prevent noise from triggering the output. Pulses less than 18 mS are considered to be noise and will not be detected as a valid pulse. Once an input pulse greater in length than 18 mS is detected, the output will be changed to the state of the input.
Bright red and green LED indicators display the system’s status at all times, thus allowing a rapid check of the system’s performance without requiring any additional test equipment. The SPR-110’s input and output terminal strip is a “Euro” type. When the stripped wire has been correctly installed in the terminal’s slot, no conductive parts are exposed on the surface of the terminal strip, thus allowing the user maximum protection from accidental electrical shock. The “K” lead of the SPR-110’s output is fused to prevent damage to the relays under almost any condition a user might cause such as excessive current, incorrect wiring, etc.
The SPR-110 has built-in MOV transient protection for the solid state relay contacts that eliminates the need for external protection. The SPR-110 is normally mounted inside another enclosure, suitable for the user’s intended application.