4
Full Description of Switch Functions
P
While this button is pushed the rate
display will show the input current
in mA, or as a percentage of the
instrument span depending upon
how the instrument has been
programmed. When the button is
released the normal display in
engineering units will return. The
function of this push-button may be
modified when alarms are fitted to
the instrument.
Down
While this button is pushed the
instrument will show the calibrated
rate display with 4mA input -
usually zero for flow applications.
When the button is released the
flow rate will again be displayed.
Up
While this button is pushed the
instrument will show the calibrated
rate display with 20mA input.
When the button is released the
flow rate will again be displayed.
E+
While these two buttons are
Down
pushed the total display will show
the least significant eight digits of
the grand total, and the grand total
annunciator will be activated.
E+
While these two buttons are
Up
pushed the total display will show
the most significant eight digits of
the grand total and the grand total
annunciator will be activated.
Down+
Resets the total display to zero
Up
when these two push-buttons are
operated simultaneously.
Selectable function from
programme menu.
See section 6.15
2.2 Displays
The BA358C has two digital displays and
associated annunciators, plus a flow
indicator as shown on page 1.
Rate
Shows the flow rate on the smaller
display
five digit display.
Total
Shows total flow since the
display
instrument was last reset on the
larger eight digit display.
Flow
Disc in the lower left hand corner
indicator
of the display 'rotates' when the
input current exceeds 4mA.
3. INTRINSIC SAFETY CERTIFICATION
3.1 ATEX certificate
The BA358C has been issued with an EC-
Type Examination Certificate by Notified
Body Intertek Testing Services (ITS,
formerly ERA Technology Ltd) confirming
compliance with the European ATEX
Directive 94/9/EC for Group II, Category 1,
gas atmospheres, EEx ia IIC T5. The
instrument bears the Community Mark and,
subject to local codes of practice, may be
installed in any of the EU member countries.
i.e. Austria, Belgium, Denmark, Finland,
France, Germany, Greece, Ireland, Italy,
Luxembourg, The Netherlands, Portugal,
Spain, Sweden and the United Kingdom.
ATEX certificates are also accepted in
Norway, Iceland, Liechtenstein and
Switzerland.
This manual describes installations which
conform with EN60079:Part 14 Electrical
Installation in Hazardous Areas. When
designing systems for installation outside the
UK, the local Code of Practice should be
consulted.
3.2 4/20mA input
In Europe, sources of energy which do not
generate more than 1.5V; 100mA and
25mW are, for intrinsic safety purposes,
considered to be simple apparatus.
Although the BA358C indicator does not
itself comply with the requirements for
simple apparatus, the EC-Type Examination
Certificate specifies that under fault
conditions the voltage, current and power at
the 4/20mA input terminals 1 and 3 will not
exceed those specified for simple apparatus.
This allows the BA358C 4/20mA input
terminals to be connected into any
intrinsically safe circuit protected by a Zener
barrier or galvanic isolator, providing the
output parameters of the circuit do not
exceed:
Uo
30V dc
Io
200mA
Po
0.85W
The BA358C EC-Type Examination
Certificate specifies that the maximum
equivalent capacitance and inductance
between the two 4/20mA input terminals 1
and 3 is:
Ci
=
20nF
Li
= 10
µ
H
To determine the maximum permissible
cable parameters these figures must be
