28
To adjust the alarm silence time select 'SIL' from
the alarm menu and press
P
which will reveal the
existing time. Each digit can be adjusted using the
Up
and
Down
push-buttons, and the
P
button to
move to the next digit. When the required time has
been entered press
E
to return to the alarm menu.
When an alarm is silenced the alarm annunciator
will flash until the silence time expires.
9.2.12 Access Setpoint: AcSP
This function controls a separate menu which
provides direct access to the alarm setpoints when
the instrument is in the display mode. See section
9.2.13 for a full description. An operator may
therefore adjust the alarm setpoints without having
access to the programme and alarm menus.
Further protection is provided by a separate
security code.
This direct access menu is enabled and a separate
security code entered from the 'AcSP' function in
the main programme menu as shown in Fig 12. To
change the menu parameters select 'AcSP' from
the programme menu and press
P
which will
display the enable prompt 'EnbL'.
Press
P
again to reveal if the direct access menu
is 'On' or 'OFF'. The
Up
or
Down
buttons will
toggle the display between the two conditions.
If 'OFF' is selected, the operator will not have
access to the setpoints from the display mode.
Return to the 'AcSP' prompt in the main menu by
pressing
E
twice.
If 'On' is selected, the operator will have direct
access to the alarm setpoints from the display
mode via a separate optional security code. To
define the four digit numerical code press
E
to
return to the 'EnbL' prompt followed by the
Up
or
Down
button to select the access code prompt
'AcCd'. Pressing
P
will reveal the current security
code. Each digit of the code may be changed by
operating 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
twice to
return to the 'AcSP' prompt in the Programme
Menu.
Code 0000 will disable the security code allowing
direct access to the setpoints by pressing the
P
and the
Up
buttons simultaneously.
9.2.13 Adjusting alarm setpoints from the
display mode
Access to the two alarm setpoints from the
indicator display mode is obtained by operating the
P
and
Up
push-buttons simultaneously as shown
in Fig 13. If the setpoints are not protected by a
security code the alarm setpoint prompt 'SPr1' or
'SPt1' will be displayed depending upon whether a
rate or total alarm has been programmed. If the
setpoints are protected by a security code, 'COde'
will be displayed first. Pressing
P
again will enable
the alarm security code to be entered digit by digit
using the
Up
and
Down
buttons to change the
flashing digit, and the
P
push-button to move to the
next digit. If the correct code is entered pressing
E
will cause alarm setpoint prompt 'SPx1' to be
displayed. Pressing the
Up
or
Down
button will
toggle the display between the two alarm setpoint
prompts 'SPx1' and 'SPx2'.
Note:
‘x’ will be
displayed as ‘r’ or ‘t’ depending upon whether the
alarm has been progammed as a rate or total
alarm.
If an incorrect security code is entered, or a button
is not pressed within ten seconds, the instrument
will automatically return to the display mode.
Fig 13 Setpoint adjustment from the display mode
