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Example field instrument temperature apparatus and methods for affecting or regulating a temperature of a field instrument are disclosed. An example apparatus includes a vortex tube having an inlet to receive a fluid, a first outlet to dispense a first portion of the fluid at a first temperature and

Example field instrument temperature apparatus and methods for affecting or regulating a temperature of a field instrument are disclosed. An example apparatus includes a vortex tube having an inlet to receive a fluid, a first outlet to dispense a first portion of the fluid at a first temperature and a second outlet to dispense a second portion of the fluid at a second temperature, the second temperature being greater than the first temperature. The example apparatus also includes a first passageway fluidly coupled to the first outlet to direct the first portion of the fluid to an electronic device in a process control system to affect a temperature of the device.

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1. An apparatus comprising: a vortex tube comprising:an inlet to receive a fluid;a first outlet to dispense a first portion of the fluid at a first temperature; anda second outlet to dispense a second portion of the fluid at a second temperature,the second temperature to being greater than the first

1. An apparatus comprising: a vortex tube comprising:an inlet to receive a fluid;a first outlet to dispense a first portion of the fluid at a first temperature; anda second outlet to dispense a second portion of the fluid at a second temperature,the second temperature to being greater than the first temperature; anda first passageway fluidly coupled to the first outlet to direct the first portion of the fluid to an electronic device disposed within a housing in a process control system to affect a temperature of the electronic device in the housing. 2. The apparatus of claim 1, wherein the first passageway is fluidly coupled to the housing to supply the first portion of the fluid at the first temperature to the housing to affect the temperature of the electronic device. 3. The apparatus of claim 1, wherein the device is used to at least one of control or measure a parameter of a pneumatic actuator operatively coupled to a valve in the process control system. 4. The apparatus of claim 3, wherein the fluid received at the inlet of the vortex tube is from the same source of fluid used to operate the pneumatic actuator. 5. An apparatus comprising a vortex tube comprising: an inlet to receive a fluid;a first outlet to dispense a first portion of the fluid at a first temperature; anda second outlet to dispense a second portion of the fluid at a second temperature, the second temperature being greater than the first temperature;a first passageway fluidly coupled to the first outlet to direct the first portion of the fluid to an electronic device disposed in a housing in a process control system to affect a temperature of the electronic device; anda first switching valve disposed in the first passageway, the first switching valve to direct the first portion of the fluid to the housing or to the atmosphere. 6. The apparatus of claim 5 further comprising a second passageway to fluidly couple the second outlet to the housing to supply the second portion of the fluid at the second temperature to the housing to affect the temperature of the device. 7. The apparatus of claim 6 further comprising a second switching valve disposed in the second passageway, the second switching valve to direct the second portion of the fluid to the housing or to the atmosphere. 8. An apparatus comprising: a housing to contain an electronic device of a process control system;a vortex tube that is to divert a first portion of a fluid to a first outlet of the vortex tube and a second portion of the fluid to a second outlet of the vortex tube; anda first passageway to fluidly couple the first outlet to the housing to supply the first portion of the fluid to an internal cavity of the housing; anda second passageway to fluidly couple the second outlet to the housing to supply the second portion of the fluid to the internal cavity of the housing. 9. The apparatus of claim 8 further comprising a flow control member disposed within the second passageway to regulate the flow of the second portion of the fluid to the internal cavity of the housing. 10. The apparatus of claim 8 further comprising a sensor to measure a temperature within the internal cavity of the housing. 11. The apparatus of claim 10, wherein the sensor is integrated into the electronic device. 12. The apparatus of claim 8 further comprising a flow control member to regulate a flow of the fluid into an inlet of the vortex tube. 13. The apparatus of claim 8, wherein the device comprises a dielectric elastomer transducer. 14. A method comprising: measuring a first temperature proximate a field instrument in a process control system;comparing the first temperature to a first threshold; andoperating a vortex tube to supply fluid at a second temperature to the field instrument when the first temperature is above the first threshold, the second temperature lower than the first temperature, the vortex tube comprising an inlet that is to receive the fluid, a first outlet that is to dispense a first portion of the fluid at the second temperature, and a second outlet that is to dispense a second portion of the fluid at a third temperature, the third temperature higher than the second temperature. 15. The method of claim 14, wherein the vortex tube is to supply the first portion of the fluid at the second temperature to a housing that contains the field instrument. 16. The method of claim 14, wherein the first temperature is to be measured by a thermostat of the field instrument. 17. The method of claim 14 further comprising: comparing the first temperature to a second threshold; andoperating the vortex tube to supply the second portion of the fluid at the third temperature to the field instrument when the first temperature is below the second threshold. 18. The method of claim 14, wherein operating the vortex tube comprises opening a valve to direct the fluid into the inlet of the vortex tube. 19. The method of claim 14, wherein the fluid received at the inlet of the vortex tube is supplied by a source, the method further comprising using the fluid from the source to operate an actuator in the process control system.