3.3 Technical data
EB 8387-3 EN 11
Design and principle of operation
Type 3731-3 Ex d Positioner (technical data in test certificates additionally apply for explosion-protected devices)
Rated travel Adjustable Direct attachment to Type 3277: 3.6 to 30 mm
Attachment acc. to IEC 60534-6 (NAMUR): 3.6 to 300 mm
Attachment to rotary actuators (VDI/VDE 3845): 24° to 100°
Travel range Adjustable Adjustable within the initialized travel/angle of rotation;
travel can be restricted to
1
5
at the maximum
Reference variable w Signal range 4 to 20 mA, 2-wire unit, reverse polarity protection,
min. span 4 mA, static destruction limit 40 V, internal current limit 60 mA
Shutdown action Type 3731-3xxxxxx0
00x1x00: Emergency shutdown at 0 mA
Type 3731-3xxxxxx1
00x1x00: Emergency shutdown at 3.85 mA ± 0.05 mA
Minimum current 3.6 mA for display
Voltage compliance
≤
9 V corresponds to 450
Ω
at 20 mA
Communication
Local communication SAMSON SSP interface and serial interface adapter
Software requirements TROVIS-VIEW with device-specific module for Type 3731-3
HART
®
communication HART
®
field communication protocol
Impedance in HART
®
frequency range: Receiving approx. 455
Ω
, sending 185
Ω
Software requirements For handheld communicator: device description for Type 3731-3
For PC: DTM file acc. to Specification 1.2, suitable for integrating the positioner in
frame applications that supports the FDT/DTM concept (e.g. PACTware);
integration into AMS™ Suite available.
Supply air Pressure Type 3731-321, Type 3731-327: 1.4 to 7 bar (20 to 105 psi)
Type 3731-323: 1.4 to 6 bar (20 to 90 psi)
Air quality acc. to
ISO 8573-1
edition 2004
Max. particle size and density: Class 4 · Oil content: Class 3
Moisture and water: Class 3
Pressure dew point: At least 10 K beneath the lowest ambient temperature to be
expected
Signal pressure (output) 0 bar up to supply pressure · Limitable to 1.4/2.4/3.7 ±0.2 bar via software
Characteristic Linear/equal percentage/reverse equal percentage
Butterfly valve/Rotary plug valve/Segmented ball valve: linear/equal percentage
User-defined (over operating software and communication)
Deviation from terminal-based conformity
≤
1 %
Hysteresis
≤
0.3 %
Sensitivity
≤
0.1%
Transit time Separately adjustable up to 240 seconds for supply air and exhaust air
Direction of action Reversible
Air consumption, steady-state Independent from supply pressure < 110 l
n
/h
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