HF197AEN_v0501_04
Page 14
3.2.3.
EXPLANATION OF SETUP-FUNCTIONS
1 - SENSOR
The settings for sensor do not influence the output signal directly. The input signal is just used to
display and monitor a value at the operator level, which is likely influence by the setpoint generator.
The display update time for this value is one second or more.
Note:
some of these settings also influence other settings.
SENSOR VALUE
11
If a sensor is available to display the actual value, do select enable to
make this function available for the operator. Else select disable.
MEASUREMENT UNIT
12
SETUP - 12 determines the measurement unit:
The following units can be selected:
no unit - mm - cm - m - meter - mil - in - ft - yd - fath - sqft - ml - l -
nl - al - m3 - nm3 - am3 - gal - usgal - igal - bbl - cuft - mg - g - kg
- ton - oz - lb - st - qr - cwt - psi - psig - mbar - mbarg - bar - barg -
pa - pag - kpa - kpag - mmh2o - mh2o - inh20 - mmhg - inhg - °C -
°F - K - p - rpm - % - ppm.
Alteration of the measurement unit will have consequences for operator
and SETUP-level values.
Please note that the Span has to be adapted as well; the calculation is not
done automatically.
TIME UNIT
13
The unit can be displayed as a rate, e.g. L/min. The rate can be displayed
per second (SEC), minute (MIN), hour (HR) or day (DAY).
DECIMALS
14
This setting determines for the number of digits following the decimal
point. The following can be selected:
00000 - 1111.1 - 222.22 - 333.333
SPAN
15
With the span, the sensor signal is converted to the selected units (setup
12 and 13).
The
span
is determined on the basis of the
selected measurement unit
and time unit
at 20mA.
Enter the span in whole numbers (decimals are set with SETUP 16).
The more accurate the span, the more accurate the functioning of the
system will be.
Example 1
Calculating the span for flowrate
Let us assume that the sensor generates 20mA at a
flowrate of 2,481.3 Liters/minute, the selected unit is
"Liters" and time unit "minute".
The span is 2481.3 Enter for
SETUP
15: "248130" and for
SETUP
16 - decimals span "2".
Example 2
Calculating the span for level
Let us assume that the sensor generates 20mA at a level
of 652.31 USGAL, the selected unit is USG and the offset
value is 200 (setup 17).
The span is 652.31-200=452.31. Enter for SETUP 14:
"452.31 and for SETUP 15 "2" and SETUP 16 “200”.
DECIMALS SPAN
16
This setting determines the number of decimals for Span
(SETUP 15). The following can be selected:
0 - 1 - 2 - 3 - 4 - 5 - 6
Please note that this SETUP - influences the accuracy of the Span
indirectly.
This setting has NO influence on the displayed number of digits for
(SETUP 14)!
OFF SET
17
Enter here the "not measured" value which is below the sensor, in case a
pressure transducer e.g. is used to measure the level.
Also, a negative offset can be entered: do press the middle and left button
simultaneously - e.g. for -85°F.
