T 8394 EN
3
Table 1:
Technical data
Type 3725 Positioner
Travel (adjustable)
Direct attachment to Type 3277 Actuator:
3.75 to 30 mm
Direct attachment to Type 2780-2 Actuator:
6/12/15 mm
Attachment to Type 3372 Actuator:
15/30 mm
Attachment according to IEC 60534-6 (NAMUR):
3.75 to 50 mm
Attachment to rotary actuators:
24 to 100°
Reference variable w
(reverse polarity protection)
Static destruction limit
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
Minimum current
3.8 mA
Load impedance
Max. 6.3 V
Supply air
Air quality acc. to ISO 8573-1
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
Signal pressure (output)
0 bar up to the capacity of the supply pressure · Can be limited to approx. 2.3 bar by software
Characteristic
3 characteristics for globe valves · 9 characteristics for rotary valves
Hysteresis
≤ 0.3 %
Sensitivity
≤ 0.1 %
Transit time
Only for actuators with initialization time > 0.5 s
1)
Direction of action
w/x reversible
Air consumption
≤ 100 l
n
/h with a supply pressure up to 6 bar and a signal pressure of 0.6 bar
Air output capacity
Actuator filled with air
At Δp = 6 bar: 8.5 m
n
3
/h,
At Δp = 1.4 bar: 3.0 m
n
3
/h
K
Vmax
(20 °C) = 0.09
Actuator vented
At Δp = 6 bar: 14.0 m
n
3
/h,
At Δp = 1.4 bar: 4.5 m
n
3
/h
K
Vmax
(20 °C) = 0.15
Permissible ambient temperature
–20 to +80 °C
–25 to +80 °C with metal cable gland
The limits in the test certificates additionally apply for explosion-protected versions
Safety
Influences
Temperature:
≤ 0.15 %/10 K
Influence of vibrations:
≤ 0.25 % up to 2000 Hz and 4 g according to IEC 770
Supply air:
None
Electromagnetic compatibility
Complying with EN 61000-6-2, EN 61000-6-3 and NAMUR Recommendation NE 21
Explosion protection
II 2G Ex ia IIC T4 according to ATEX
Intrinsically safe, Ex ia IIC T4 according to CSA Group
1Ex ia IIC T4 Gb X according to GOST
Degree of protection
IP 66
Materials
Housing
Polyphthalamide (PPA)
Cover
Polycarbonate (PC)
External parts
Stainless steel 1.4571 and 1.4301
Cable gland
M20 x 1.5, black polyamide (PA)
Venting
High-density polyethylene (PE-HD)
Weight
Approx. 0.5 kg
1)
For faster actuators, a volume restriction must be used. Otherwise, the initialization cannot be performed successfully.
Table 2:
Explosion protection certificates
Type of approval
Certificate number
Date
Comments
EC Type Examination Certificate
PTB 11 ATEX 2020 X
2011-08-25
II 2G Ex ia IIC T4
GOST certification
RU C-DE.GB08.B.00697
2014-12-15
1Ex ia IIC T4 Gb X
CSA certification
2703735
2014-06-03
Ex ia IIC T4
