Technical Data - Samson 3730-3 Mounting And Operating Instructions

Design and principle of operation
Positioner with position transmitter
The position transmitter (13) is a two-wire
transmitter and issues the travel sensor sig-
nal as a 4 to 20 mA signal processed by the
microcontroller.
Since this signal is issued independent of the
positioner's input signal (min. current
3.8 mA), the actual travel/angle of rotation
is controlled in real-time. Additionally, the
position transmitter provides the possibility
of signaling a positioner fault over a signal
current of <2.4 mA or >21.6 mA.
1.3

Technical data

Positioner
Nominal travel,
adjustable
Travel range
Reference variable w
Minimum current
Load impedance
Supply air
Signal pressure (output)
Characteristic,
user-defined adjustable
over operating software
Hysteresis
Sensitivity
10
EB 8384-3 EN
Direct attachment to Type 3277: 3.6 to 30 mm, attachment acc. to IEC 60534-6:
3.6 to 200 mm or 24° to 100° opening angle for rotary actuators
Adjustable within the nominal travel/nominal angle, max. ratio 1 : 5
Signal range 4 to 20 mA, 2-wire unit, reverse polarity protection,
min. span 4 mA, static destruction limit 100 mA
3.6 mA for display, 3.8 mA for operation
Version without explosion protection: ≤ 6 V (corresponding to 300 Ω at 20 mA),
Explosion-protected version: ≤ 7 V (corresponding to 350 Ω at 20 mA)
Supply pressure from 1.4 to 6 bar (20 to 90 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 beneath the lowest
ambient temperature to be expected
0 bar up to supply pressure, limitable to 1.4/2.4/3.7 ± 0.2 bar via software
Linear/equal percentage/reverse equal percentage/butterfly valve linear/
butterfly valve eq. percentage/rotary plug valve linear/rotary plug valve eq. percen-
tage/segmented ball valve linear/segmented ball valve eq.percentage
Deviation from terminal-based conformity ≤1 %
≤ 0.3 %
≤ 0.1 %
Version with inductive limit switch
The rotary shaft of the positioner carries an
adjustable tag which actuates the installed
proximity switch.
The optional inductive limit switch (11) leads
to A1 and the software limit switch, which
remains in operation, leads to A2.
Version with external position sensor
In this version, only the sensor is mounted to
the control valve. The positioner is located
separately from the valve.
The connection of x and y signals to the
valve is established via cable and air hosing
(only for non-hazardous areas and without
inductive limit switch).