Positioner Samson 3730 3

The positioner samson 3730 3 electro-pneumatic positioner series is designed to work with general industrial applications. This positioner series includes several model versions to meet any end user or process requirements. The basic control positioners are the 3730-0 and 3730-1.

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Features of 3730-3 Electropneumatic Positioner

  • Electropneumatic positioner with HART® communication
  • Die-cast aluminum or stainless steel housing
  • Attachment to linear actuators according to IEC 60534-6, VDI/VDE 3847, or SAMSON integral attachment
  • Attachment to rotary actuators according to VDI/VDE 3845
  • Attachment to double-acting actuators with Type 3710 Reversing Amplifier
  • Integrated EXPERTplus diagnostics for control valves
  • Any desired mounting position of the positioner (but not suspended)
  • Simple one-knob, menu-driven operation
  • Easy-to-read display in any mounting position thanks to rotatable reading direction
  • Configurable with a computer over the SSP interface using the TROVIS-VIEW software
  • Variable automatic start-up thanks to four different initialization modes
  • Preset parameters, only values deviating from the standard need to be adjusted
  • Calibrated travel sensor without gears susceptible to wear

Specifications of 3730-3 Electropneumatic positioner

Type 3730-3 Positioner The technical data for the explosion-protected devices may be restricted by the limits specified in the test certificates.
Valve travel Adjustable Direct attachment to Type 3277 Actuator Attachment according to IEC 60534-6 (NAMUR) Attachment according to VDI/VDE 3847

Attachment to rotary actuators (VDI/VDE 3845)

3.6 to 30 mm

3.6 to 300 mm

3.6 to 300 mm

24 to 100° opening angle

Travel range Adjustable Adjustable within the initialized travel/angle of rotation of the valve; travel can be restricted to 1/5 at

the maximum.


Set point w

Signal range 4 to 20 mA · Two-wire device, reverse polarity protection Minimum span 4 mA
Static destruction limit 100 mA
Minimum current 3.6 mA for display · 3.8 mA for operation
Load impedance ≤ 8.2 V (corresponds to 410 Ω at 20 mA)

Supply air

Supply pressure 1.4 to 7 bar (20 to 105 psi)
Air quality acc. to

ISO 8573-1

Max. particle size and density: Class 4 · Oil content: Class 3 · Pressure dew point: Class 3 or at least 10

K below the lowest ambient temperature to be expected

Signal pressure (output) 0 bar up to the capacity of the supply pressure · Can be limited to 1.4 bar/2.4 bar/3.7 bar ± 0.2 bar

by software






Linear/equal percentage/reverse equal percentage

User-defined (over operating software and communication)

Butterfly valve, rotary plug valve and segmented ball valve: linear/equal percentage

Deviation ≤1 %
Hysteresis ≤0.3 %
Sensitivity ≤0.1 %
Transit time Venting or filling with air adjustable separately up to 240 s by software
Direction of action Reversible
Air consumption, steady state Independent of supply air approx. 110 ln/h
Air output ca- pacity to fill actuator with air At Δp = 6 bar: 8.5 mn³/h · At Δp = 1.4 bar: 3.0 mn³/h ·     KVmax (20 °C) = 0.09
to vent actuator At Δp = 6 bar: 14.0 mn³/h ·  At Δp = 1.4 bar: 4.5 mn³/h ·     KVmax(20 °C) = 0.15


Permissible ambient temperature

–20 to +80 °C (all versions)

–45 to +80 °C with metal cable gland

–55 to +80 °C Special version for low temperatures with metal cable gland (on request)

The temperature limits for the explosion-protected devices may be further restricted by the limits specified in the test certificates.



Temperature ≤0.15 %/10 K
Supply air None
Effect of vibration ≤0.25 % up to 2000 Hz and 4 g according to IEC 770
Electromagnetic compatibility Complying with EN 61000-6-2, EN 61000-6-3, EN 61326-1 and NAMUR Recommendation NE 21

Electrical connections

One M20x1.5 cable gland for 6 to 12 mm clamping range Second M20x1.5 threaded connection additionally available Screw terminals for 0.2 to 2.5 mm² wire cross-section
Degree of protection IP 66/NEMA 4X
Use in safety-instrumented systems (SIL)

Emergency venting at 0 mA set point

and using optional solenoid valve

Observing the requirements of IEC 61508, the systematic capability of the pilot valve for emergency

venting as a component in safety-instrumented systems is given.

Use is possible on observing the requirements of IEC 61511 and the required hardware fault tolerance in safety-instrumented systems up to SIL 2 (single device/HFT = 0) and SIL 3 (redundant configuration/ HFT = 1).
Explosion protection See Table 3
Communication (local) SAMSON SSP interface and serial interface adapter
Software requirements (SSP) TROVIS-VIEW with database module 3730-3
Communication (HART®) HART® field communication protocol

Impedance in HART® frequency range: Receiving 350 to 450 Ω · Sending approx. 115 Ω

Software re- quirements (HART®) For handheld communi-



Device description for Type 3730-3


For PC

DTM file according to specification 1.2, suitable for integrating the device into frame applications that support the use of FDT/DTM (e.g. PACTware); other integrations (e.g. AMS, PDM) available
Compliance   ·