NIVELCO UNICOM SAK-305 User Manual

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1. INTRODUCTION
The UNICOMM SAK–305 HART modem is able to establish communication line between HART-capable field
devices and process controller computer. Two possible application modes:
– As a HART-USB modem, connected into the USB input of a PC. In this case the modem does not need
external power supply. The device is galvanically isolated from both (USB and HART) sides.
– As a HART-RS485 modem, connected into a suitable device with RS485 interface input. The
communication protocol is HART on the RS485 line. The RS485 network is a 2-wire (half duplex) system.
In this case the device needs external power supply. The device is galvanically isolated from both (HART
and Power supply) sides.
The UNICOMM SAK–305–6 HART modem is an associated apparatus. It shall be placed outside the
hazardous area and can be connected to HART-capable field devices placed inside the hazardous area.
2. TECHNICAL DATA
2.1. G
ENERAL DATA
Power supply Supplied from USB
Current consumption < 60 mA
PC USB A-B cable
Electrical
HART Twisted, shielded pair with 0.5...2.5 mm
connection
line cross section Resistance max.75 Ω, Capacitance max. 200 nF
Power supply (U ) 10...30V DC
p
Power consumption < 1.5 W
Supply 0.5...2.5 mm
Twisted, shielded pair with 0.5...2.5 mm
Electrical
RS485 interface
cross section
connection
Twisted, shielded pair with 0.5...2.5 mm
HART line
cross section Resistance max.75 Ω, Capacitance max. 200 nF
RS485 terminal resistance 124 Ω
RS485 max. cable length 1000 m (3300 feet)
HART resistance 250 Ω
Ambient temperature –20°C...+70 °C (–4°C...+158 °F)
Housing material PPO
Mechanical connection DIN (EN 60715) rail mountable
Ingress protection IP20
Electrical protection Class III.
Mass 0.1 kg (0.22 lbs)
(AWG20...AWG14) wire
2
(AWG20...AWG14) wire cross section
2
(AWG20...AWG14) wire
2
(AWG20...AWG14) wire
2
2.2 S E
PECIAL DATA FOR X CERTIFIED
MODELS
Ex marking II (1) G [Ex ia Ga] IIC
Intrinsically U =30 V, I =100 mA, P =1 W,
i i i
safe limit data L =200 µH, C =2 nF
i i
U 253 V AC
m
2.3 A
CCESSORIES

User's manual

Warranty Card

EU Declaration of Conformity
 USB A-B cable (1.8m)
2.4 O
RDER CODE
UNICOMM SAK–305–
Standard 2
Ex ia 6
2.5 D
IMENSION
2.6 C E
ONDITIONS OF X APPLICATION
The device should be placed outside the
hazardous area and should be connected to
intrinsically safe [Ex ia] certified and approved
devices! The device should be protected against
direct sunlight!
The power supply and ambient temperature values
can not exceed the limitations of the technical data
table!
3. WIRING
3.1 W
IRING EXAMPLE
.
BKI 11 ATEX 0022  sak3052a0600h_02  1/2