Description Channels 2 to 4
Load
● Ex i: <470 Ω
● Non-Ex: <770 Ω
Time constant (adjustable) 0.0 to 100 s
Fault current
Measurement range (mA)
Lower fault current (mA)
Upper fault current (mA)
4-20 NAMUR
3.8 - 20.5
3.5
22.6
4-20 US
4.0 - 20.8
3.75
22.6
4-20 NAMUR
4.0 - 20.5
2.0
22.0
4-20 US
4.0 - 24.0
2.0
25.0
0-20 NAMUR
0.0 - 20.5
0.0
22.0
0-20 US
0.0 - 24.0
0.0
25.0
Customized fail-safe mode
● Last valid value
– Lower fault current
– Upper fault current
● Fail-safe value
● Current value
Galvanic isolation All inputs and outputs are galvanically isolated PELV circuits with 60 V DC isolation from
each other and ground.
Maximum test voltage: 500 V AC
Cable
1)
Standard industrial signal cable with up to 3 twisted pairs with overall screen can be con‐
nected between the transmitter and the control system. Individual pair or overall screen is
optional depending on user requirements.
Voltage range Max. 24 V DC (active)
14 to 30 V DC (passive)
1)
User supplied cables must be suitable for 5°C above surrounding ambient temperature.
Table 10-8 Digital output
Description Channels 2 to 4
Pulse 41.6 µs to 5 s pulse duration
Resolution 1 μs
Frequency 0 to 10 kHz, 50 % duty cycle, 120 % overscale provision
Resolution 0.2 Hz
Load < 750 Ω
Time constant (adjustable) 0 to 100 s
Active 0 to 24 V DC, 87 mA, short-circuit-protected
Passive 3 to 30 V DC, 100 mA, short-circuit-protected
Functions
● Pulse
● Frequency
● Alarm class / NAMUR status
● Alarm item
Technical data
10.4 Outputs
SITRANS FST030 (Modbus)
126 Operating Instructions, 08/2018, A5E37367739-AD
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