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STI S.r.l. – Via Dei Caravaggi 24040 Levate (BG) – ITALY www.imi-critical.com
Manual 4028 – rev.06 11/2018 – FT - 6 -
2.2 Specifications for explosion proof
• Connections
o POWER: 2 wires from signal (min 3.6 mA,
19÷24 Vdc – Z equivalent 950 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
• Output
o ANALOG: 4÷20 mA passive loop powered
14,5÷24,5 V
• 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
o 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 2
(1) G Ex d 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 – 4,11 kg
o Stainless steel 316 – 10,78 kg
• Options available
Same of intrinsically safe execution (excluded
fail freeze version)
*See selection guide for options / certifications available
2.3 Specifications for natural gas execution
• Natural gas supply
o Natural gas clean and dry as ISO 8573-1 – Class 3
o SUPPLY PRESSURE: 2.5÷6 bar
o GAS CONSUMPTION: 1.5 Nm
3
/h at 6 bar
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