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FISHER™ 3710 & 3720 Positioners

3710 Pneumatic Positioners/3720 Electropneumatic Positioners can be used with either diaphragm or piston rotary actuators. These positioners provide a valve ball or disk position for a specific input signal. The 3710 provides a valve position in response to a pneumatic input signal. The 3720 is created by the addition of a FISHER 3722 electro-pneumatic converter to the 3710 positioner. The positioner provides a valve position in response to a DC current input signal. Either type can easily be configured as single- or double- acting for rotary actuators.

Main Features

Accurate, Fast Response—3710 and 3720 positioners use field-proven spool valve technology for a simple design that gives accurate, fast-responding operation with high cycle life. These positioners are able to withstand the severe vibrations of most plant environments.
Corrosion-Resistant Construction with Air Purge—Case, components, and gasket materials withstand harsh environments. Proven engineered resins and 300 Series stainless steel construction is used throughout each unit. Die castings are low copper aluminum alloy to maximize corrosion resistance. Positioner bleed air purges internal positioner parts. As an option with some FISHER actuators, bleed air also purges the actuator housing for additional protection.
Extended Temperature Capability—With EPDM O-rings and input module diaphragm, 3710 and 3720 positioners can be used in low-temperature and high-temperature applications.
Meets Special Application Requirements— 3710 and 3720 positioners with EPDM O-rings and input module diaphragm can be used in applications with special material requirements as in the food and beverage industry, pharmaceuticals, and tobacco processing. - Easy Positioner Adjustments—With the cover removed, all internal components are easily accessed. Zero and span adjustments are made by hand with no tools required.
Stable Operation—Changes in supply pressure and ambient temperature have minimal effect on positioner operation.
Control Valve Diagnostic Testing Capability—To support diagnostic testing of valve/actuator/positioner packages, connectors, piping, and other hardware can be installed between the 3710 positioner and the actuator.
Valve Position Indicator—Standard, low-profile indicator or optional, beacon-style indicator mount easily to the positioner cover.

Specifications

	3710	3720
Regional Categorization	Group II, Division 2 gases and dusts according to ATEX, Group II/Division 2 equipment according to CUTR	Explosion-proof, intrinsically safe, non-flammable, dust-proof
Certification	ATEX, CUTR, PED	CSA, FM, ATEX, IECEx, CUTR, Weight, KGS, INMETRO, NEPSI, RCM
Communication Protocols	3-15 or 6-30 psi, 0.2-1.0 or 0.4-2.0 bar, pneumatic signal	4-20mA
Diagnosis	without	without
Input Signal	Pneumatic	Electrical
Maximum outlet pressure	150 psi	150 psi
Installation Type	Actuator-mounted	Actuator-mounted
Operating Temperature	Standard temperature, high temperature	Standard temperature, high temperature
Position Control	Modulation	Modulation
Security Certification	NIL	NIL
Supply Medium	Air, gas	Air
Other Configurations	Contact your local Emerson business partner or sales office for more information on technical specifications or options for this product.

Applications

As an important supporting control component of pneumatic valve, valve positioner is widely used in petrochemical, chemical, power, metal, light industry and other fields.
Ideal for applications with special material requirements, such as the food and beverage industry, pharmaceuticals and tobacco processing.
Suitable for diaphragm or piston rotary actuator control valves to indirectly control flow, pressure, temperature and liquid level in processes.