... data (temperatures, energy, relay activity)• PT1000 temperature sensors• Variable speed and standard relay outputs• Up to 4 dry contact signal ... Grundfos VFS flow & temp sensor inputOutputs1 x 4 Amp variable speed semiconductor relay3 x 5 Amp standard relayExpansionRS232 plug (for ... status4. Operation mode5. Flow rate6. Relay ON/OFF status7. Variable relay (R1) speed8. Relay 2,3 & 4 function name9 ...