14
6.3 Summary of programmable functions
This section summarises all of the programmable
functions. When read with Figs 7A and 7B it
provides a quick aid for calibrating the instrument.
If more detail is required, each section contains a
reference to a full description of the function.
SUMMARY
Display
Description of function
'root'
Square root extractor
Enables the square root extractor for
linearising the output from differential
flowmeters.
Percentage clip-off, below which the
instrument does not totalise, is
automatically set to 5% of maximum
flow when the 'root' function is turned
'On'.
See section 6.4
'rESn'
Display resolution
Selects the resolution of the least
significant digit of the rate display. May
be set to 1, 2, 5 or 10 digits.
See section 6.5
'd.P.'
Decimal points
Defines the position of the decimal
point in both the rate and total displays.
See section 6.6
'CAL'
Calibration of rate display using
external current source.
Enables the zero and span of the rate
display to be adjusted using an external
current source such as a calibrator.
Also enables a complete loop to be
calibrated from primary element to the
indicator display.
When used with an accurate traceable
current source this is the preferred
method of calibration.
See section 6.7
'SEt'
Calibration of rate display using
internal references.
Enables the zero and span of the rate
display to be adjusted without the need
for an accurate input current or
disconnection from the 4/20mA loop.
See section 6.8
Display
Description of function
'Cond'
Indicator conditioning
This is a protected sub-menu which
contains the calibration routine for the
two internal references 'rEF', and the
mains (line) frequency selection
function 'FrE'.
See section 6.9
CAUTION
Please read sections 6.9 and
6.9.1 of this manual before
changing any of the
parameters in this sub-menu.
Incorrect adjustment may
result in reading errors.
'CLr. Gtot' Clears grand total
This function resets the grand total to
zero when 'CLr YES' is selected, and
'SurE' is entered to confirm the
instruction.
Note: Once cleared, a grand total can
not be recovered.
See section 6.10
't-bASE'
Timebase
Three selectable divisors which
define whether the rate display
represents flow per second, per
minute or per hour.
See section 6.11 & Fig 6.
‘C - - P'
Function of P push-button in
display mode
The instrument may be programmed
to show on the rate display the input
current in milliamps, or the input as a
percentage when the
P
push-button
is operated in the display mode.
Select ‘PC’ to display % of span and
‘4-20’ to display the input current.
See section 6.12
