RHEONIK RHE28, Installation & Start?Up Manual

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Appendix A: Safety Instructions – Ver. 1.00 29 / 43
A.2 System Description:
A Rheonik Coriolis mass flow meter system for hazardous areas consists of a mass flow sensor
RHM and a transmitter RHE with built in barrier or of a mass flow sensor RHM, a dedicated barrier
EZB and a transmitter RHE without barrier.
The mass flow sensor RHM is intrinsically safe and can – depending on the individual certification
– be mounted in zone 0, zone 1 or zone 2. For the American market versions for div. 1 and for div
2 are available.
The RHE28 is an associated equipment and contains the barriers for the RHM to be connected.
Depending on the certification the transmitter RHE28 may be mounted in the following areas:
Code Mountable in Certified according
A2 zone 2; safe area ATEX, IECEx
AB zone 2; safe area ATEX, IECEx
AS safe area ATEX, IECEx
C2 zone 2; div 2; safe area, group IIC CSA, for USA and Canada
CB zone 2; div 2; safe area, group IIB CSA, for USA and Canada
CS safe area CSA, for USA and Canada
A.3 Electrical Safety Limits
Power supply and I/O:
Signal Terminals Type Nominal
Voltage Maximum
Voltage Um,
Code
AS, CS Um, Code
A2, AB,
C2, CB
AC supply 23, 24 Supply 90 – 250V AC 250V 250V 250V
DC supply 20,21 Supply 10 – 28V 30V 250V 30V
Supply for
analog out 50, 57 Supply
out 24V 30V*) 250V 30V
Digital Out 31 - 34 Out 24V 30V**) 250V 30V
Analog Out 51 - 54 Out 24V 30V 250V 30V
Digital In 35, 36 In 24V 30V 250V 30V
RS485 70, 71 Interface 70 to 71: ±5V 30V to PE***) 250V 30V
USB (Connector) Interface 5V 5V 250V 30V
*) A short circuit to any voltage between 0V and 30V should be avoided, but will not damage the
output. The current is internally limited by a self-resetting poly-fuse.
**) A short circuit to any voltage between 0V and 30V should be avoided, but will not damage
the output.