51-3
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Logix 500 Overview
The Logix 500 is a two-wire, 4-20 mA input digital valve
positioner. The Logix 520 also utilizes the HART proto-
col to allow two-way remote communication with the
positioner. The Logix 500 positioner controls single-
acting actuators with linear and rotary mountings. The
Logix 500 is completely powered by the 4-20 mA input
signal. The minimum input signal required to function
is 3.6 mA.
Since the positioner is insensitive to supply pressure
changes and can handle supply pressures from 22 to
87 psig (1.5 to 6 barg), a supply regulator is usually not
required; however, in applications where the supply
pressure is higher than the maximum actuator pres-
sure rating a supply regulator is required to lower the
pressure to the actuator’s maximum rating (not to be
confused with operating range). A coalescing air filter
is strongly recommended for all applications due to the
close tolerances in the positioner.
NOTE: The air supply must conform to ISA Standard
ISA 7.0.01 or IEC 770 (a dew point at least 18
°
F / 10
°
C
below ambient temperature, particle size below five mi-
crons – one micron recommended – and oil content
not to exceed one part per million).
Specifications
Linearity
<
±
1.0%
Resolution
< 0.1%
Repeatability
< 0.2%
Deadband
< 0.2%
Table 5: Performance
Characteristics (typical)
Operating Temperature Standard
-4 – 178
°
F
-20 – 80
°
C
Low
-40 – 178
°
F
-40 – 80
°
C
Transport and Storage
-40 – 178
°
F
Temperature
-40 – 80
°
C
Operating Humidity
0 – 100% non-condensing
Intrinsic Safety
EEx ib II C T4/T5/T6;
Ta = 65/55/40
°
C
Table 6: Environmental Conditions
Housing Material
Cast aluminum,
powder-painted
Soft Goods
Nitrile
Weight
2.7 lbs (1.2 kg)
Table 7: Physical Specifications
Output Pressure
0 – 100 % of supply air
Range
pressure
Output Flow Capacity
1.41 SCFM @ 22 psi
(input @ pressure)
2.4 Nm
3
/h @ 1.5 bar
4.12 SCFM @ 90 psi
7.0 Nm
3
/h @ 6.0 bar
Table 4: Output Signal
Supply Air Quality
Free from moisture, oil
and dust per ISA-7.0.01
Input Pressure Range
22 – 87 psi (1.5 to 6.0 bar)
Air Consumption
0.047 SCFM @ 22 psi
(steady state)
0.08 Nm
3
/h @ 1.5 bar
0.071 SCFM @ 87 psi
0.120 Nm
3
/h @ 6.0 bar
Table 3: Supply Air
Feedback Shaft
0
°
to 90
°
normal
Rotation
0
°
to 40
°
minimum
Table 2: Stroke Output
Input Signal Range
4 - 20 mA
(with HART)
Compliance Voltage
12.0 VDC
(with HART signal)
Voltage Supply (maximum)
30 VDC
Minimum Required
3.6 mA
Operating Current
Table 1: Input Signal
