Liquid Controls HML110 IOM User Manual

Page 23

HML 110

110_EN_LC_5_3_6X.doc

When a mass unit of measure is set, the specific gravity function is automatically enabled by the
system. Please, note that the mass measure is heavily affected by the temperature. With certain

liquids this may cause significant measurement errors. The following measure of time units can be
selected: s = second, m = minute, h = hour, d = day.

(POS. 2.3) Unit of measure and number of decimal places [Tot.MU=dm³ X.XXX]
Setting the unit of measure and number of decimals places displayed for the volumes. To set the unit

of measure, position the cursor on field of the unit of measure. To set the type of unit, position the

cursor on the blank space between the unit of measure and the numeric value; The number of
decimal places can be selected by placing the cursor on numeric field and choosing one of the

possible combinations: 1000-01.00-001.0-00001.
(POS. 2.4-2.5) Pulse value channel 1-2 and unit of total measure. [Pls1-2=dm³ X.XXXXX]

Setting of a flow volume by which a corresponding pulse will be emitted on channel 1-2. (units must
be identical to ‘Full scale’(POS 2.1 and 8) and ‘Totalizer’ functions. To set the parameter, complete the

three fields, from left to right: 1) unit of measure, 2) unit type and 3) numeric value. The selection is
performed by positioning the cursor in the field to be modified. To change the unit type (metric,

British or American, mass or volume) 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 meters(m) or feet(ft). Only those units described above
are available to be selected. This function is active only if the pulse emission on channel 1 is enabled.

(POS. 2.6-2.7) Pulse duration channel 1-2

[Tpls1-2=ms XXXX.XX]

Setting of the duration of the pulse generated on channel 1-2 as set in (POS 2.4-2.5). This value is

expressed in milliseconds and has to be between 0,4 and 9999,99. When the high frequency output is

present, then the minimum value can be set to a minimum of 0,04 milliseconds. ATTENTION: since
the converter cannot detect which type of device is connected to the converter, the user must verify

that the set pulse duration is compatible with the external device processing such pulses. If, for
example, an electro-mechanical pulse counter is connected, one of two problems may occur; firstly, if

the pulse is too long the coils may burn out, secondly, if the pulse is too short, the counter may not
be able to function, with the possibility of causing damage of the output.

MENU 3 - MEASURE

(POS. 3.1) Time constant

[Tconst=s XXXX.X]

This parameter affects the integrating filter, setting a quicker or slower response time, according to

the value set. A higher value corresponds to a more stable but slower measure, a smaller gives and
faster measure but is more unstable. 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. 3.2) Acceleration threshold

[Skip thr=% XXX]

Acceleration threshold set. The acceleration threshold is the limit beyond which a flow rate variation

gives an immediate response at the output, without being filtered by the time constant. This function
allows the converter to have an immediate response in cases of big flow rate variations, while filtering

(and delaying) the response to small variations, resulting in a very stable measure. The set value is a
percentage of the full scale value (from 0 to 125%). If such a value is set to zero any flow rate

variation bigger than 0.5% of the full scale value will immediately activate an output response. The
following graphs show the instrument response in two cases: Firstly, a flow rate variation from 0 to

10% completely absorbed by the time constant effect

Cubic inch

Gal

American gallon

GAL

British gallon

Cubic foot

Bbl

Standard barrel

BBL

Oil barrel

Cubic yard

kgl

KAmerican gallon

KGL

KBritish gallon

Cubic centimeter

Milliliter

Liter

Cubic decimeter

Dal

Decalitre

Hectolitre

Cubic meter

Ounce

Pound

Ton

Short tons

Gram

Kg Kilogram
T

Ton