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STI S.r.l. – Via Dei Caravaggi 15, 24040 Levate (BG) – ITALY www.imi-critical.com
Manual 4028 – rev.06 11/2018 – FT - 5 -
2.1 Specifications for intrinsically safe
• Connections
o POWER: 2 wires from signal (min 3.5 mA,
12÷30 Vdc – Z equivalent 550 ohm)
o ELECTRICAL CONNECTION:
▪ Signal ½” NPT (or metric M20x1.5 on
request)
▪ Auxiliary input/output ½” NPT (or metric
M20x1.5 on request)
o PNEUMATIC CONNECTION: ½” NPT
female
o COMUNICATION PROTOCOL: HART, TTL
RS232
• Input
o ANALOG: 4÷20 mA – HART
TM
o ON OFF: 2x configurable digital
(optocoupler 24 Vdc)
• Output
o ANALOG: 4÷20 mA passive loop 10÷26,5 V
o ON OFF: 2x configurable digital
(optocoupler 24 Vdc)
• Stroke Movement
o FEEDBACK ANGLE OF ROTATION:
30°÷120° (<30° with lower resolution)
o ADJUSTABLE SPEED: range 0÷300
seconds, individually configurable for each
direction
o CHARACTERISTIC CURVE:
▪ linear
▪ equal percentage
▪ configurable
o CONTROL PARAMETER: individually
configurable for each direction
o TRAVEL CONTROL: Min. and Max settable
stroke limits; adjustable pressure on seat
• Air supply
o INSTRUMENT AIR: free of oil, water and
dust to ISO 8573-1 – Class 3
o SUPPLY PRESSURE: 2.5÷10 bar
o AIR CONSUMPTION: 1.5 Nm
3
/h at 6 bar
• Performance Data (for angle > 90°)
according to IEC 61514-2
o HYSTERESIS+DEADBAND: ±0.15%
o REPEATIBILITY: ±0.15%
o SENSITIVITY: ±0.1%
o LINEARITY: ±0.3%
o INFLUENCE OF AMBIENT
TEMPERATURE: ≤0.3% for every 10°C
o FLOW CAPABILITY: 180Nm
3
/h at 6bar (CV
2.3)
o ACTION: configurable single or double
• Environmental capabilities
o HAZARDOUS PROTECTION: ATEX II 1G
Ex ia IIC T6/T5/T4
o AMBIENT:
▪ protection IP66 (NEMA 4x)
▪ operation temperature: -40°C / +80°C
(-55°C / +80°C for TR CU)
▪ storage temperature: -40°C / +80°C
(storehouse must be clean and dry,
absence of corrosive gases or vapours)
o HUMIDITY: up to 100%
o VIBRATIONS: up to 2g (ISA-S75.13)
o CE MARK: CE conformity and EMC
• Case materials and weights
o Aluminium, low copper content with
stainless steel feedback shaft – 3,25 kg
o Stainless steel 316 – 8,82 kg
• Options available
o FAIL FREEZE (for more information see
page 20)
o REMOTE FEEDBACK SENSOR (for more
information see page 21)
o DISPLAY AND PUSH BUTTON (only with
aluminum case) (for more information see
page 22)
o UNIVERSAL LINKAGE FOR:
▪ Linear long stroke actuator
(70÷1500 mm)
▪ VDE/VDI 3845 for quarter turn
applications
▪ Lever for side yoke or top mounting
application
o SPECIFIC ACCESSORIES:
▪ gauges
▪ CF device
▪ BV and BW boosters
o COLLECTED OR HIGHLY SILENCED
EXHAUST
o HIGH SPEED COMUNICATION KIT
o HIGH CORROSION RESISTENCE WITH
316 STAINLESS STEEL CASE
*See selection guide for options / certifications available
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