Some semantic clarification if I may.
It seems the works sensor and thermostat are used to mean the same thing.
They are not.
A sensor does just that it "senses" ie Volts, Ohms, degrees, PSI, or other Analogs and are not readily bypassed unless you know how it "senses." (Voltage, current, resistance etc.)
A thermostat or alarm input contact is a two position, Binary device. Open, closed, alarm, normal, high, low etc. These devices are easily bypassed, jumpered or lifted from the circuit.
Be careful they may have 120 VAC on them. With a Volt meter on AC measuring across the contact if you read zero volts the contact is closed. It may or may not be in alarm depending on the control panel or input panel.
28 Year controls person.