Hach Ultra ORBISPHERE 510, Operator'S Manual

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Orbisphere 510/511/512 Analyzers - Inputs/Outputs Menu 79 of 138
Operator Manual
ORBISPHERE
These points should be set keeping in balance the following conditions (see Fig 6-4 on
page 78 ):
• The smaller is Range 2, the better is the analog signal resolution within the
expected range of measure.
• Size of Range 1 and 3 should be set to deliver an adequate level of resolution for
the measures falling out of the expected range of measure.
• In Range 0 the analog outputs only shows that measurement is below the MLL
value. Similarly in Range 4 the analog output only shows that measurement is
over the MHH value.
The formula to compute the measurement knowing the current or the voltage and the
resolution R is given in the following table:
6.5.3 “None” Analog Output
This is the default value.
Setting the analog output to "None" on a particular output means that analog output
value will always be zero and importantly ensures that no current is emitted on that
output, so reducing power consumption (especially useful in battery powered portables)
as well as reducing heat within the instrument.
Output
type
Tri-linear:
Range Measurement M Resolution R
4-20 mA
1: AOL > I > 4
M=MLL+(ML-MLL)
*
(I-4)/(AOL-4) R=(ML-MLL)
*
20/((AOL-4)
*
1010)
2: AOH > I > AOL
M=ML+(MH-ML)
*
(I-AOL)/ (AOH-AOL) R=(MH-ML)
*
20/((AOH-AOL)
*
1010)
3: 20 > I > AOH
M=MH+(MHH-MH)
*
(I-AOH) / (20-AOH) R=(MHH-MH)
*
20/((20-AOH)
*
1010)
0-20 mA
1: AOL > I > 0
M=MLL+(ML-MLL)
*
I/AOL R=(ML-MLL)
*
20/(AOL
*
1010)
2: AOH > I > AOL
M=ML+(MH-ML)
*
(I-AOL)/ (AOH-AOL) R=(MH-ML)
*
20/((AOH-AOL)
*
1010)
3: 20 > I > AOH
M=MH+(MHH-MH)
*
(I-AOH)/(20-AOH) R=(MHH-MH)
*
20/((20-AOH)
*
1010)
0-5 V
1: AOL > U > 0
M=MLL+(ML-MLL)
*
U/AOL R=(ML-MLL)
*
5/(AOL
*
1010)
2: AOH > U > AOL
M=ML+(MH-ML)
*
(U-AOL)/ (AOH-AOL) R=(MH-ML)
*
5/((AOH-AOL)
*
1010)
3: 5 > U > AOH
M=MH+(MHH-MH)
*
(U-AOH) / (5-AOH) R=(MHH-MH)
*
5/((5-AOH)
*
1010)