4 7 NE 72 en
1.4 Technical specifications
Input signal (direct current) 4–20 mA, 0–20 mA
Split ranges 4–12 mA
12–20 mA
Input resistance max. 190 Ω
Turning angle of feed-back shaft max. 90°
Relation between turning angle
and signal (standard model) linear
Supply pressure ps 1.4–8 bar
(21–115 psi)
Effect of supply pressure < 0.2 % / 0.1 bar
(< 0.14 % / 1 psi)
Ambient temperature (standard model) -25° to +85 °C
(-13° to +185 °F)
Effect of temperature < 0.05 % / °C
(< 0.025 % / °F)
Performance with 12 % friction
loaded double-acting piston actuator
-dead band < 0.3 %
- hysteresis < 0.7 %
-linearity < 2 %
Effect of vibration (1.5 g, 5-100 Hz)< 1 %
Enclosure class IP 54
Weight approx. 2.2 kg (4.8 lb)
Construction materials:
-case anodized Al alloy
-cover polycarbonate
-internal parts stainless steel,
aluminium alloy and
stainless spring steel
- diaphragms and seals nitrile rubber
(standard model)
1.5 Recycling and disposal of a rejected
positioner
Most positioner parts can be recycled if sorted according to
material. Most parts have material marking. A material list is
supplied with the positioner. In addition, separate recycling
and disposal instructions are available from the manufac-
turer. A positioner can also be returned to the manufacturer
for recycling and disposal against a fee.
1.6 Safety precautions
Table 1 Pilot valve alternatives
Positioner
type
Actuator
stroke volume
dm
3
(litres)
Air
consumption
nm
3
/h / scfm *)
Max. delivery
nm
3
/h / scfm *)
NE724 1.0–8.0 0.9 / 0.5 12 / 7
NE726 8.0–30.0 1.2 / 0.7 18 / 10.4
NE727 > 30 2.1 / 1.2 32 / 18.6
*) supply pressure 4 bar / 60 psi
CAUTION:
Do not exceed the positioner performance limitations!
Exceeding the limitations marked on the positioner may
cause damage to the posioner, actuator and valve.
Damage or personal injury may result.
CAUTION:
Do not dismantle a pressurized positioner!
Dismantling a pressurized positioner will result in uncon-
trolled pressure release. Always isolate the relevant part of
the pipeline, release the pressure from the positioner and
the piping.
Failure to do this may result in damage or personal injury.
CAUTION:
Beware of the parts with live voltage!
A voltage, which is normally not dangerous, is supplied to
the positioner. Avoid touching live parts and bare wires
and short circuiting live parts and the housing.
CAUTION:
Beware of the moving parts when positioner is oper-
ated!
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