4
Down
Resets the total display to zero
+Up
when these two push-buttons are
operated simultaneously for two
seconds.
Selectable function from programme
menu.
See section 6.12
Down
While these buttons are pushed the
+P
instrument will display the firmware part
number and version number.
Note
: When optional alarms are fitted, the
BA338C may be programmed to provide direct
access to the alarm setpoints from the display
mode when the P + Up push-buttons are operated.
– see section 9.3
2.3 Displays
The BA338C has two digital displays and
associated annunciators, plus a flow indicator as
shown on page 1.
Rate
Shows the flow rate on the
Display
smaller six digit display.
Total
Shows the total flow on the
display
larger eight digit display. Set
to zero when local or remote
reset switch is operated.
Flow
This disc in the lower left
indicator
hand corner of
the
display
'rotates'
for two seconds each time an
input pulse is received.
Therefore when the pulse
input frequency exceeds
0.5Hz the disc appears to
rotate continuously
Hold
Activated when input
Annunciator
frequency is below the clip-off
threshold.
Reset
Activated while instrument is
Annunciator
being reset.
3. INTRINSIC SAFETY CERTIFICATION
3.1 ATEX certificate
The BA338C has been issued with an EC-Type
Examination Certificate by Notified Body Intertek
Testing Services (ITS) 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 in
Switzerland. This manual describes installations
which conform with BS EN60079:Part14 Electrical
Installation in Hazardous Areas. When designing
systems for installation outside the UK, the local
Code of Practice should be consulted.
3.2 Power supply
When installed in a hazardous area the BA338C
must be powered via a Zener barrier or galvanic
isolator from a dc supply located in the safe area.
The input safety parameters of terminals 1 and 2
are:
Ui
=
28V dc
Ii
=
100mA dc
Pi
=
0.7W
Any certified Zener barrier or galvanic isolator with
output safety parameters within these limits may
be used. The two system certificates provide
guidance to help selection of suitable devices.
The maximum equivalent capacitance and
inductance between terminals 1 and 2 is:
Ci
=
20nF
Li
=
20µH
To determine the maximum permissible cable
parameters the above figures should be subtracted
from the maximum permitted cable parameters
specified for the Zener barrier or galvanic isolator
powering the BA338C.
