20
9. ACCESSORIES
9.1 Units of measurement & instrument
identification.
New indicators are supplied with a printed scale
card showing the units of measurement and tag
information specified when the instrument was
ordered. If this information was not supplied a
blank scale card will be supplied which can easily
be marked on-site with a dry transfer or a
permanent marker.
Custom printed scale cards are available as
accessories and may be easily fitted as shown in
section 5.7 of this manual.
All models can also be supplied with a blank or
custom laser engraved stainless steel legend plate
- see Fig 7. The plate, which after installation is
visible from the front of the instrument, is supplied
loose with two fixing screws for securing it to the
rear of the instrument's back-box. This plate can
typically accommodate:
1 row of 5 alphanumeric characters 10mm high
or 1 row of 6 alphanumeric characters 7mm high
or 2 rows of 10 alphanumeric characters 5mm high
9.2 Display backlight
Both models can be supplied with a factory fitted
loop powered backlight which produces green
background illumination enabling the display to be
read at night or in poor lighting conditions. When
fitted the indicator's voltage drop at 20mA
increases to 9.1V.
9.3 Pipe mounting kit
The BA393G is a 316 stainless steel kit which will
secure an indicator to a horizontal or vertical pipe
with an outside diameter between 40 and 73mm.
Detailed assembly instructions are supplied with
each BA393G pipe mounting kit.
9.4 Panel mounting kit
The BA394G panel mounting kit, which consists of
two 316 stainless steel brackets, will secure an
indicator into a panel aperture. The kit does not
seal the joint between the panel and the instrument
and is intended for mounting an indicator onto an
open panel.
APPENDIX 1
Dust Certification
A1.0
Ex tb dust certification
In addition to IECEx and ATEX certification
permitting
installation
in
explosive
gas
atmospheres, which is described in the main
section of this instruction manual, both models
have IECEx and ATEX dust ignition protection by
enclosure Ex tb.
Dust ignition protection by enclosure Ex tb is a
type of explosion protection in which electrical
equipment is mounted in an enclosure that
provides dust ingress protection, and limits the
enclosure surface temperature allowing installation
in Zones 1 and 2.
A1.1
Zones, and Maximum Surface
Temperature
Both indicators have Ex ib mb tb IIIC T80°C Db
-40ºC ≤ Ta ≤ +60ºC certification. When connected
to a suitable system the indicators may be installed
in:
Zone 21
explosive atmosphere in the form
of a cloud of combustible dust in
air is likely to occur occasionally in
normal operation.
Zone 22
explosive atmosphere in the form
of a cloud of combustible dust in
air is not likely to occur in normal
operation, but if it does occur, will
only persist for a short period.
Be used with dust in subdivisions:
IIIA
combustible flyings
IIIB
non-conductive dust
IIIC
conductive dust
Having a Minimum Ignition Temperature of:
Dust cloud
120°C
Dust layer on indicator
155°C
up to 5mm thick
Dust layer on indicator
Refer to
over 5mm thick.
IEC 60079-14
At an ambient temperature between -40 and
+60°C
Note:
Types of explosion protection on both
certificates are listed in alphabetical order.
