BEKA BA534D, Manual

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1. DESCRIPTION
The BA534D is an externally powered pulse input
rate totaliser primarily intended for use with
flowmeters. The instrument simultaneously
displays the rate of flow and the total flow in
engineering units on two separate displays.
Housed in a robust IP66 glass reinforced
polyester (GRP) enclosure with an armoured
glass window, the BA534D is surface mounting or
may be pipe mounted using one of the accessory
kits. A stem mounting kit is also available allowing
direct mounting onto a flowmeter conduit entry.
2. OPERATION
Fig 1 shows a simplified block diagram of a
BA534D. The instrument has two sets of input
terminals allowing connection to high or low level
voltage pulses, switch contacts, an open collector
or to a two wire proximity detector. It may
therefore be used with almost any pulse output
flowmeter.
Independent programmable rate and total scaling
factors allow the two displays to be in the same or
in different engineering units. The total display
may be reset to zero via the internal push-buttons,
or an external switch contact.
Although the BA534D is fully programmable, an
optional user selectable security code prevents
tampering or accidental adjustments.
A wide range of accessories includes an isolated
pulse output which represent total flow, and an
isolated 4/20mA analogue output which is
proportional to the rate of flow. Optional alarms,
which may be programmed to function on the rate
or total displays, further extend the applications.
Fig 1 Simplified block diagram of BA534D
2.1 Initalisation
Each time power is applied to the instrument
initalisation is performed. After a short delay the
following display sequence occurs:
All segments of the display are activated for
about 2 seconds.
The product firmware part number and
version number are displayed for about 2
seconds.
Rate display and totaliser start to
function
using calibration information
stored in the instrument's permanent
memory.
2.2 Controls
The BA534D is controlled and calibrated via four
push-button switches which are located behind
the instrument control cover, or as an option on
the outside of the instrument cover. In the
display mode i.e. when the instrument is
displaying rate and total flow the switch functions
are:
Description of Switch Functions
E+ Down While these buttons are pushed the
total display will show the least
significant eight digits of the grand
total, and the grand total annunciator
will be activated.
E+Up While these two buttons are 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 for two
seconds.
Selectable function from programme
menu.
See section 5.12
Down While these buttons are pushed the
+P instrument will display firmware part
number and version number.
Note : When optional alarms are fitted, the
BA534D 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 8.2