BEKA BA534D, Manual

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5.14 Resetting grand total: ‘CLr. Gtot’
The grand total is a separate sixteen digit counter
which duplicates the total display but is not zeroed
when the total display is reset to zero. The grand
total may be viewed in the display mode in two
eight digit sections as described in section 2.2 of
this manual.
The grand total counter can only be reset to zero
from the 'CLr. Gtot' function in the main
programme menu. To zero the grand total
counter select 'CLr. Gtot' and press
P which will
cause the instrument to display 'Clr. no' with 'no'
flashing. Continuously press the
Up or Down
push-buttons until 'CLr. YES' is displayed and
then press
P which will result in a 'CLr 0000'
prompt with one digit flashing. Using the Up , and
Down buttons and the P button to move to the
next digit, confirm the request by entering the
password 'SurE'. Note 'S' is entered as '5'.
Pressing
E will then reset the grand total counter
to zero and return the instrument to the 'CLr. Gtot'
prompt in the main menu.
WARNING
After resetting the grand total
counter to zero the old grand total
can not be recovered.
5.15 Security code: ‘CodE’
The calibration and conditioning of the instrument
may be protected by a four digit security code
which must be entered before access to the
programme menu is granted. New instruments
are programmed with the default security code
0000 which allows unrestricted access to all
programming functions without entering a security
code.
To enter a new security code select 'COdE' from
the menu and press
P which will cause the
instrument to display the current security code.
Each digit of the code can be changed using the
Up and Down push-buttons, and the P button to
move to the next digit. When the required code
has been entered press
E to return to the main
menu. The revised security code will be activated
when the indicator is returned to the display mode.
If the security code is lost, access to the
programmable functions can be obtained by
moving the internal security link to the override
position. The original security code can then be
viewed by selecting 'CodE' from the main menu
and pressing
P .
To gain access to the security code link, remove
the instrument control cover by undoing the two
‘C’ screws – see Fig 3.
If the instrument is fitted with external push-
buttons the connecting ribbon cable should be
unplugged from the outer row of the five pin
connector. The security code override link is
located on the inner row of the five pin connector
as shown in Fig 7.
Fig 7 Location of security override link
6. CALIBRATION EXAMPLE
In this example a BA534D rate totaliser is
connected to a turbine flowmeter having a K-factor
of 1050.0 pulses per litre. The flowmeter has a
magnetic pick-off with an output greater than
20mV peak at 5 litres per minute and a usable
range of 5 to 60 litres per minute.
The BA534D is required to display rate of flow in
litres per hour with a resolution of one litre and
total flow in cubic metres with a resolution of 0.01
cubic metres. Totalisation is to stop when the
flow rate falls below 300 litres per hour. The
display is to be updated twice per second and
filtering is required. In this application the
operator needs to reset the total display to zero by
simultaneously pushing the
Up and Down push-
buttons. To prevent tampering the instrument
programme menu is to be protected by security
code 1209