Hold
Activated when flow rate falls below the
clip-off value and totalisation is
inhibited.
Grand
Is a 16 digit (15 digit with negative sign)
Total
number which is not zeroed when the
total display is zeroed. The Grand Total
is viewed from the operating mode as
two eight digit numbers, it may be reset
to zero from within the configuration
menu or from the operating mode.
3.
INTRINSIC SAFETY CERTIFICATION
The BA358E rate totaliser has ATEX and IECEx
gas and dust certification. This section of the
instruction manual describes ATEX gas
certification. ATEX dust, IECEx and other
approvals are each described in separate
appendixes to this manual.
3.1 ATEX gas certification
Notified Body Intertek Testing and Certification Ltd
have issued the BA358E with an EC-Type
Examination
Certificate
number
ITS11ATEX27254X. This confirms compliance
with harmonised European standards and it has
been used to confirm compliance with the
European ATEX Directive for Group II, Category
1G equipment, Ex ia IIC T5 Ga Ta = -40 to
+70ºC. The Rate Totaliser bears the community
mark and subject to local codes of practice may be
installed in any of the European Economic Area
(EEA) member countries. ATEX certificates are
also acceptable for installations in Switzerland.
This section of the instruction manual describes
ATEX installations in explosive gas atmospheres
conforming with EN60079-14 Electrical
Installations in Hazardous Areas. When designing
systems for installation outside the UK the local
Code of Practice should be consulted.
3.2 Zones, gas groups and T rating
The BA358E Rate Totaliser has been certified
Ex ia IIC T5. When connected to a suitable
system it may be installed in:
Zone 0
explosive gas air mixture
continuously present.
Zone 1
explosive gas air mixture likely
to occur in normal operation.
Zone 2
explosive gas air mixture not
likely to occur, and if it does
will only exist for a short time.
Be used with gases in groups:
Group A propane
Group B ethylene
Group C hydrogen
Having a temperature classification of:
T1
450
o
C
T2
300
o
C
T3
200
o
C
T4
135
o
C
T5
100
o
C
At ambient temperatures between -40 and +70
o
C.
Note:
The specified operating temperature of the
BA358E is –20 to +70ºC. At temperatures below
–20ºC the instrument will continue to totalise but
the display will not function.
This allows the Rate Totaliser to be installed in all
gas Zones and to be used with most common
industrial gases.
3.3 Special conditions for safe use
The ATEX certificate has an ‘X’ suffix indicating
that special conditions apply for safe use.
WARNING
To avoid an electrostatic charge being
generated instrument enclosure should
only be cleaned with a damp cloth.
3.4 4/20mA input
The input safety parameters for the 4/20mA input,
terminals 1 and 3 are:
Ui
=
30V dc
Ii
=
200mA
Pi
=
0.84W
The maximum equivalent capacitance and
inductance between the two 4/20mA input
terminals 1 and 3 is:
Ci
= 13nF
Li
= 16µH
The maximum permitted loop cable parameters
can be calculated by adding these figures to Ci and
Li of other instruments in the loop and subtracting
the totals from the maximum cable capacitance Co
and cable inductance Lo permitted for the Zener
barrier or galvanic isolator powering the loop.
Although the BA358E does not comply with the
requirements for
simple
apparatus
, the EC-Type
Examination Certificate states that for intrinsic
safety considerations, under fault conditions the
output voltage, current and power at terminals 1 &
3 will not exceed those specified by clause 5.7 of
EN 60079-11 for
simple apparatus.
This simplifies
the application and intrinsic safety documentation
for a loop into which the BA358E is connected.
Apart from Ci, the affect of the Rate Totaliser may
be ignored when assessing loop safety.
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