ISOIL ISOMAG ML 252 Operating And Installation Manual Download Page 20

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252_EN_IS_1_3_00.doc

Available units of mass and volume

When a mass unit of measure is set, the specific gravity function is automatically enabled by the
system. Please, note that the temperature heavily affects the mass measure and therefore with
certain liquids this may cause significant measure errors. The units of measure of time may be
chosen among the following values:

= second,

= minute,

= hour,

= day.

( POS. 2.3) Unit of measure and number of decimal totaliz.

[ tot. UM.:dm³ X.XXX]

Setting the unit of measure and number of decimals for visualized the totalizer
For set the unit of measure , position the cursor on field of the actual unit of measure;  For set
the type of unit, position the cursor on the blank space between the unit of measure and t he
numeric value; For set the number of decimal totaliz .  position the cursor on numeric field and
choose one of the possible combinations: 1000-01.00-001.0-00001.

( POS. 2.4- 2.5) Pulse value channel 1 and unit of totaliz .

[ I MP1- 2= dm³ X.XXXXX]

Setting of the pulse volume corresponding to channel 1-2 and of the totalizers measure units.
There are three fields to fill in to set this parameter, from left to right: 1) measure unit, 2) unit
type and 3) numeric value. The selection is performed by positioning the cursor on the field to be
modified. To change the unit type (metric, British or American, mass or volume) just position the
cursor on the blank space between the measure unit and the numeric value. When the nominal
diameter is set to zero it is possible to modify only the numeric field since the measure unit stays
at meter (m) or feet (ft). The possible measure units are those above described

( POS. 2.6- 2.7)

Pulse duration channel 1

[ TPUL1- 2= msXXXX.XX]

Setting of the duration of the pulse generated on channel 1. I ts value is expressed in
milliseconds and has to be between 0.4 and 9999.99.

( POS.2.8- 2.9) Minimum/ maximum value for input 4÷ 20mA

[ I . I S=

bar

± XXX.XX]

Setting the minimum/ maximum value for external device with 4÷ 20mA output. There are four
fields to fill in to set this parameter, from left to right: 1) unit of measure, 2) type of unit of
measure and 3) sign, 4) numeric value. The selection is performed positioning the cursor on the
field to modify. To change the type of unit of measure (pressure, temperature or percentage of
f.s) just position the cursor on the blank space between the unit of measure and the numeric
value. This functions is active only with additional module.

MENU 3. - MEASURE

( POS. 3.1) Time constant

[T. COST= sXXXX.X]

Time constant set. This parameter affects the integrating filter making the instrument response
quicker or slower, depend to the set value. A higher value corresponds to a more

stable but slower

measure, a

smaller value the opposit e. The most common values are from 1 to 5 seconds. The

value of this parameter has to be within the range from 0 (integral filter disabled) to 6000.0
seconds. The following diagram shows the response of the instrument for a flow rate variation from
0 to 100% within the T time constant period.

( POS. 3.4) Automatic scale change enable

[AUTORANGE= ON/ OFF]

Enables the automatic change of scale. The meter may have two different working ranges in order
to suit to the variable process conditions. I n order to get the best results out of this function it is
important that range N.2 is bigger than N.1. When the flow rate increases and reaches the 100% of
the full scale 1, then the meter automatically switches to scale 2. When the flow rate decreases
again reaching a value on scale 2 equal to the 90% of full scale N.1, then the active scale is 1

Cubic inch

Gal

American gallon

GAL

British gallo n

Cubic f oot

Bbl

Standard barrel

BBL

Oil barrel

Cubic yard

kgl