Liquid Controls HML110 IOM - Manual (Page 22)

HML 110
22
110_EN_LC_5_3_6X.doc
MENU 1 - SENSOR
(POS. 1) Nominal diameter of sensor [ND= XXXX]
MAIN MENU FUNCTION PRGRAMMING
(description of the functions with access code< 3)
The following pages give a description of the most important functions and how they can be changed or
enabled/disabled by the user.
MENU 1 - SENSOR
(POS. 1.7) “Autozero” calibration [Autozero cal.]
This function allow to zeroing the meter . To perform the zero calibration, it is necessary for the
sensor to be full of liquid, and the liquid be perfectly still.
Even very small movement of the liquid may affect the result, and, consequently, the accuracy of the
system.
Once you are sure the above conditions have been fulfilled (and the percentage flow rate value is
stable) press the key for one second or more. Check the percentage flow rate value goes to zero.
If this does not occur repeat the operation again. When the value is stable at zero, then press the
key.
(POS. 1.7) “Empty pipe” threshold
[E.P. thr.]
Value of empty pipe threshold detection. The span of this function is 0-255.
Since the sensibility of empty pipe detection could be change by the liquid conductivity, ground
connections, type of lining, in case of needed it’s possible to adjust manually the preset threshold.
It’s recommended to check periodically its proper functioning.
Increasing of value means decreasing the sensibility.
MENU 2 - SCALES
(POS. 2.1-2.2) Full scale N. 1-2 [Fs1-2=dm³/s X.XXXX]
The Full scale range N.1.-2 is the corresponding output signal (20mA) to the meters maximum flow
rate (max 10m/s). There are four fields to fill in order to set this parameter, from left to right: 1)
volume unit of measure, 2) type of unit, 3) time unit of measure and 4) numeric value. The selection
is made by positioning the cursor on the field to modify. To change the type of unit of measure
(metric, British or American, mass or volume) the cursor has to be positioned on the symbol “/” (field
N. 2). When the nominal diameter is set to zero it is possible to modify only the numeric field, since
the unit of measure stays at m/sec.
The following tables show the units of measure available and the conversion factor by comparison
with 1 dm3 and 1 kg. The converter accepts any kind of combination of units of measure satisfying
both the following conditions:
‰ Numeric field value
≤ 9999
‰ 1 /
25
fs
max
≤ numeric field value ≤ fs
max
.
where fsmax is the maximum full scale value corresponding to the sensor, equal to a 10 m/sec liquid
speed. The units of measure are shown as appear on the display. The British and American units are
diversified by using capital and small characters.
Menu visualized on the converter ( from 1 to 11)
Synthetic description of the function
Identification of the function (not visualized on display)
Converter request