29
To adjust an alarm setpoint select 'SPx1' or 'SPx2'
and press
P
which will reveal the current setting.
Each digit of the setpoint may be adjusted using
the
Up
and
Down
push-buttons, and the
P
button
to move to the next digit. When the required
setpoint has been entered, pressing
E
will return
the display to the 'SPx1' or 'SPx2' prompt from
which the other setpoint may be selected, or the
indicator may be returned to the display mode by
pressing
E
again.
Direct access to the alarm setpoints is only
available when the
menu is enabled - see section
9.2.12
9.3 Display backlight
The BA354ND can be supplied with LED
backlighting to improve display contrast when the
instrument is installed in a poorly illuminated area.
The backlight is electrically segregated from the
measuring circuit and has been certified as a
separate Ex nL Group II. Category 3G circuit.
The Type n input parameters are:
Ui
30V dc
Ii
100mA
This allows the backlight to be powered from a
safe area 18 to 30V dc supply as shown in Fig 14,
providing the supply voltage is below 30V, the
backlight safety components will ensure that the
input current is less than 100mA.
Fig 14 Backlight powered by Zener barrier
Reducing the supply voltage below 18V, or fitting a
curent limiting resistor in series with the supply will
reduce the display brillance.
9.4 External push-buttons
For applications requiring frequent access to the
programme menus the BA354ND can be supplied
with an external membrane keypad. These
switches, which maintain the IP66 integrity of the
enclosure, allow all functions to be controlled
without removing either of the enclosure covers.
9.5 Pipe mounting kits
Two pipe mounting kits are available for securing
the BA354ND to a horizontal or vertical pipe.
BA392D Stainless steel bracket secured by two
worm drive hose clips for 60 to 80mm
outside diameter pipes.
BA393
Heavy duty stainless steel bracket
secured by a single 'V' bolt. Will clamp
to any pipe with an outside diameter
between 40 and 80mm.
9.6 Stem mounting kit
The BA395 stem mounting kit comprises a short
length of stainless steel conduit with a male M20 x
1.5 thread at both ends which enables the
BA354ND to be mounted directly onto a flow
transmitter.
