SensyMaster FMT230, FMT250
THERMAL MASS FLOWMETER | OI/FMT230/250-EN REV. C
11
Electrical data
Modbus outputs and digital outputs
Model ATEX/IECEx: FMT2xx-A1…, FMT2xx-A2…, FMT2xx-A3…
Model cFMus: FMT2xx-F1…, FMT2xx-F2…
Operating
values
Type of protection
(general)
‘Ex ec’ / ‘NI’
(Zone 2, 22)
(Div. 2, Zone 2)
‘Ex e’ / ‘XP’
(Zone 1, 21)
(Div. 1, Zone 1)
‘Ex ia’ / ‘IS’
(Zone 1, 21)
(Div. 1, Zone 1)
Outputs
U
N
[V] I
N
[mA]
U
N
[V] I
N
[mA]
U
M
[V]
I
M
[mA]
U
O
[V]
I
O
[mA] P
O
[mW] C
O
[nF] C
O pa
[nF] L
O
[µH]
Modbus, active
Terminals A / B
30 30
30 30
30 100
4,2 150 150
13900 — 20
U
i
[V] I
i
[mA]
P
i
[mW]
C
i
[nF] C
i
pa [nF] L
i
[µH]
4,2 150 150
13900 — 20
Digital output DO1, passive
Terminals 41 / 42
30 30
30 30
30 100 30 25 187 20 — 200
Digital output DO2, passive
Terminals 51 / 52
30 30
30 30
30 100 30 25 187 20 — 200
All outputs are electrically isolated from each other and from the power supply.
Digital outputs DO1 / DO2 are not electrically isolated from each other. Terminals 42 / 52 have the same potential.
Special connection conditions
Note
If the protective earth (PE) is connected in the flowmeter's
terminal box, you must ensure that no dangerous potential
difference can arise between the protective earth (PE) and the
potential equalization (PA) in areas with explosion risk.
The output circuits are designed so that they can be connected
to both intrinsically-safe and non-intrinsically-safe circuits.
• Combining intrinsically safe and non-intrinsically safe circuits
is not permitted.
• On intrinsically safe circuits, potential equalization should be
established along the entire length of the cable used for the
signal outputs.
• The rated voltage of the non-intrinsically safe circuits is
U
M
= 30 V.
• Intrinsic safety is preserved If the rated voltage U
M
= 30 V is
not up-scaled when connections are established to non-
intrinsically safe external circuits.
• The
information
in
Changing the type of protection – ATEX,
IECEx and UKCA
on page 16 must be observed when
changing the type of protection.
