This Robertshaw gas valve is commonly found in pizza ovens

As a professional-grade automatic vent damper

How should this switch be tested during a maintenance call

inducer motor Hall Effect sensors

Calibration is performed by adjusting the zero and span settings to ensure the 3-15 psig output aligns precisely with the 50-150°F scale using a precise pressure gauge and a known temperature reference

Belimo NMQB24-MFT Actuator Els PW 17895 This Robertshaw gas valve isThe 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