A method for conducting in-service testing of a pneumatic signal amplifier, the method comprising: supplying, by executing one or more instructions with a processor of a valve controller in response to a test initiation signal, a pressurized control fluid to an inlet of the pneumatic signal amplifier, the inlet of the pneumatic signal amplifier being operatively coupled to and in fluid communication with the valve controller and an outlet of the pneumatic signal amplifier being operatively coupled to and in fluid communication with an actuator that is operatively coupled to a valve; determining, by executing one or more instructions with the processor, a first pressure value of the pressurized control fluid, the first pressure value corresponding to an inlet pressure of the pressurized control fluid at the inlet of the pneumatic signal amplifier measured by a first pressure sensor of the valve controller; determining, by executing one or more instructions with the processor, a second pressure value of the pressurized control fluid, the second pressure value corresponding to an outlet pressure of the pressurized control fluid at the outlet of the pneumatic signal amplifier as measured by a second pressure sensor of the valve controller; determining, by executing one or more instructions with the processor, a ratio value between the first and second pressure values; determining, by executing one or more instructions with the processor, whether the ratio value satisfies a threshold; and in response to determining that the ratio value satisfies the threshold, generating, by executing one or more instructions with the processor, a notification indicating that the pneumatic signal amplifier is functional. supplying, by executing one or more instructions with a processor of a valve controller in response to a test initiation signal, a pressurized control fluid to an inlet of the pneumatic signal amplifier, the inlet of the pneumatic signal amplifier being operatively coupled to and in fluid communication with the valve controller and an outlet of the pneumatic signal amplifier being operatively coupled to and in fluid communication with an actuator that is operatively coupled to a valve; determining, by executing one or more instructions with the processor, a first pressure value of the pressurized control fluid, the first pressure value corresponding to an inlet pressure of the pressurized control fluid at the inlet of the pneumatic signal amplifier measured by a first pressure sensor of the valve controller; determining, by executing one or more instructions with the processor, a second pressure value of the pressurized control fluid, the second pressure value corresponding to an outlet pressure of the pressurized control fluid at the outlet of the pneumatic signal amplifier as measured by a second pressure sensor of the valve controller; determining, by executing one or more instructions with the processor, a ratio value between the first and second pressure values; determining, by executing one or more instructions with the processor, whether the ratio value satisfies a threshold; and in response to determining that the ratio value satisfies the threshold, generating, by executing one or more instructions with the processor, a notification indicating that the pneumatic signal amplifier is functional.