Special Instructions For Ft Positioner Intrinsically Safe; Electromagnetic Interference - STI FasTrak Installation And Maintenance Instruction Manual

3.4 Special instructions for FT positioner intrinsically safe execution
In hazardous area FT positioner is to be installed with electrical barriers between the FT positioner and the electrical
power sources.
The type plate is attached to the positioner. It indicates the degree of explosion protection and the certificate valid for
your positioner. Additional electrical information are shown in the internal electronic board label.
FT positioner's mechanical enclosure and components are suitable for installation in hazardous atmospheres.
The complete FT positioner is suitable for installation in potentially explosive atmospheres 94/9/CE ATEX directive.
Equipment group II surface industry, category 2 for use in zone 1 with explosive atmospheres caused by gases,
vapours or mists, Group II and class of ignitability C in conformity to types of protection standardized EN 60079-0. The
component is considerated to be suitable for installation with temperature classification:
•
with FT positioner supplied via connector J3, 4÷20 mA loop, only, with no connection to connectors J6, digital
input & J1 digital output or connector J10, analogue feedback:
T5 in ambient temperature -40°C / +80°C;
T6 in ambient temperature -40°C / +60°C.
•
With FT positioner supplied using all of the inputs:
T4 in ambient temperature -40°C / +80°C;
T5 in ambient temperature -40°C / +60°C.
See dedicated certificate for operating temperature.

WARNING_
•
Any user-made changes or manipulations of the device are prohibited! Only the manufacturer and an expert for
explosion protection are authorized to modify the device.
•
Before re-using a FT positioner that has already been used in another installation place always reset the device
to the factory setting. Never start the auto adjustment function before having restored the factory setting!
Otherwise, hazardous situations may occur due to improper settings.
•
Do not use the (J7) communication interface when the positioner is installed and used in the hazardous area.

WARNING_
•
Do not use flammable gas mixture nor oxygen or oxygen-enriched gas as a pressure medium.
•
Use cable entries and cables approved for a service temperature corresponding to the maximum ambient
temperature increased by 10 K or corresponding to the minimum ambient temperature, respectively.

3.5 Electromagnetic interference

•
Do not lay signal lines close to power lines. Power lines produce interference in their near vicinity, which may
affect measured value transmission on the signal line.
•
When changing electrical connections inside the FT positioner housing, observe ESD handling precautions.
The use of a conductive, earthed, wrist strap is recommended.
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STI S.r.l. – Via Dei Caravaggi 24040 Levate (BG) – ITALY
Manual 4028 – rev.06 11/2018 – FT
INSTRUCTION MANUAL
FasTrak
II 2G Ex ia IIC T6/T5/T4
®
Fig. 3
www.imi-critical.com
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