Technical Data - Samson 3725 Mounting And Operating Instructions

3.4 Technical data

Type 3725 Positioner
Travel (adjustable)
Reference variable w
(reverse polarity protection)
Static destruction limit
Minimum current
Load impedance
Supply air
Air quality acc. to
ISO 8573-1
Signal pressure (output)
Characteristic
Hysteresis
Sensitivity
Transit time
Direction of action
Air consumption
Air output capacity
To fill actuator with air
To vent actuator
Permissible ambient
temperature
For faster actuators, a volume restriction must be used. Otherwise, the initialization cannot be performed
1)
successfully.
EB 8394 EN
Direct attachment to Type 3277:
Direct attachment to Type 2780-2:
Attachment to Type 3372 Actuator:
Attachment according to IEC 60534-6 (NAMUR):
Attachment to rotary actuators:
4 to 20 mA signal range · Two-wire device
Split-range operation 4 to 11.9 mA and 12.1 to 20 mA
±33 V
3.8 mA
Max. 6.3 V
Supply air: 1.4 to 7 bar (20 to 105 psi)
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
0 bar up to the supply pressure · Can be limited to approx. 2.3 bar by software
3 characteristics for globe valves · 9 characteristics for rotary valves
≤ 0.3 %
≤ 0.1 %
Only for actuators with initialization time > 0.5 s
w/x reversible
≤ 100 l /h with a supply pressure up to 6 bar and a signal pressure of 0.6 bar
n
At Δp 6 bar: 8.5 m ³/h
n
At Δp 6 bar: 14.0 m ³/h
n
–20 to +80 °C
–25 to +80 °C with metal cable gland
The limits in the test certificates additionally apply for explosion-protected versions
Design and principle of operation
1)
At Δp = 1.4 bar: 3.0 m
n
At Δp = 1.4 bar: 4.5 m
n
5 to 30 mm
6/12/15 mm
15/30 mm
5 to 50 mm
24 to 100°
³/h, K (20 °C) = 0.09
Vmax
³/h, K (20 °C) = 0.15
Vmax
21