The Samson 3730-3 is a single-acting electropneumatic positioner for linear and rotary pneumatic actuators. It converts a 4–20 mA control signal into precise pneumatic output pressure and features HART communication. It is widely used in process plants for reliable throttling control with simple local operation and automatic adaptation to the valve.
| Parameter | Value |
|---|---|
| Input Signal | 4–20 mA DC, two-wire, reverse polarity protection |
| Minimum Current | 3.6 mA (display), 3.8 mA (operation) |
| Supply Air | 1.4–7 bar (20–105 psi) |
| Air Quality | ISO 8573-1 Class 4 (particles), Class 3 (oil), dew point 10 K below ambient |
| Hysteresis | ≤0.3 % |
| Sensitivity | ≤0.1 % |
| Ambient Temperature | –20 to +80 °C (–4 to +176 °F); –45 to +80 °C with metal cable gland |
| Degree of Protection | IP66 |
| Housing Material | Aluminum or stainless steel 1.4581 |
| Weight | Approx. 1.0 kg |
Q: Does it auto-calibrate? A: Yes – automatic adaptation to valve and actuator.
Q: What communication protocol? A: HART (4–20 mA).
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