Appendix A: Safety Instructions – Ver. 2.00
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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 RHE21 is an associated equipment and contains the barriers for the RHM to be connected.
Depending on the certification the transmitter RHE21 may be mounted in the following areas:
Code Mountable in
Certified according / by
A1
zone 1, 2; safe area
ATEX, IECEx
A2
zone 2; safe area
ATEX, IECEx
AS
safe area
ATEX, IECEx
C1
zone 0, 1, 2; div 1, 2; safe area CSA, for USA and Canada
C2
zone 2; div 2; safe area
CSA, for USA and Canada
CS
safe area
CSA, for USA and Canada
A.3
Electrical Safety Limits
Power supply and I/O (All RHE21 except RHE21-E*D1-**I*-A***-***):
Signal
Terminals
Type
Nominal Voltage
Um
AC supply
23, 24
Supply
90 – 250V AC
250V
DC supply
20,21
Supply
10 – 28V
250V
Supply
for
analog out
50, 57
Supply out
24V*)
250V
Digital Out
31 - 34
Out
(30V)*
250V
Analog Out
51 - 56
Out
24V
250V
Digital In
35, 36
In
24V
250V
RS485
70, 71
Interface
70 to 71: ±5V
70, 71 to PE: 30V**)
250V
USB
(Connector) Interface
5V
250V
*) A short circuit to any voltage between 0V and 30V should be avoided, but will not damage the
output.
**) The nominal signal Voltage between 70 and 71 is 3.3V. The interface is floating but clamped
to PE with a clamping voltage of 30V.
Summary of Contents for RHE21
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