How should this switch be tested during a maintenance call

This Robertshaw gas valve is commonly found in pizza ovens

or cracked pressure tubing

Key Benefits for the Contractor Wide Operating Range: Covers a broad spectrum of low-side monitoring from vacuum to 100 psi

Dual-Power Versatility: Operates on 20-30Vac hardwire or AA batteries

Belimo NMQB24-MFT Actuator Els PW 17895 How should this switch beThe Belimo NMQB24 MFT Actuator is a non spring return, high speed solution designed for precise proportional damper control in commercial HVAC systems. Delivering a steady 70 in lb torque, this multifunction technology (MFT) actuator offers field programmable flexibility via 24Vac dc power. It natively supports a 2 10Vdc control signal, but remains adaptable for 4 20mA modulation (using a 500 Ohm resistor), PWM (1500 Ohm), and floating point or on off