Environnement AS32M, Техническое руководство, Страница: 89 / 186

Duplication prohibited
AS32M
Environnement
S.A
DECEMBER 2013
3–51
This screen is used to program the ranges of each displayed parameter. There are four available
ranges. Ranges correspond to the full scale of the analog output, and units are those of the
parameters displayed in the
« Signal »
column:
Range 1: from 0 to 1.
Range 2: from 1 to 10.
Range 3: from 10 to 100.
Range 4: from 100 to 1000.
Operation principle of ranges:

If range 1 AND 0–1V on analog output, 1 ppb corresponds to 1 V on analog output.

If range 2 AND 0–1V on analog output, 10 ppb corresponds to 1 V on analog output.

If range 3 AND 0–1V on analog output, 100 ppb corresponds to 1 V on analog output.

If range 4 AND 0–1V on analog output, 1000 ppb corresponds to 1 V on analog output.
Idem for 1–10 V, 0–20 mA, and 4–20 mA.
When the signal value is higher than the full scale of the current range, the analyzer switches to the
next higher range. It switches again to the lower range when measurement again falls below 85 % of
the full scale of the current range.
Automatic scale adjustment of the output signal depends on the selected range. When the user
operates on several measurement ranges and only one analog range for the output values, an output
identical value can be obtained for different measurement values, as shown on the curve below.
1
2 3 4
0
1V
M
EASUREMENT RANGES
O
UTPUT
SIGNAL
0-1V 0-10 V 0-100 V 0-1000 V
To avoid range commutation, the user can assign the same value to all four parameter ranges to be
sent as analog output.
The linearization curve Ax+B is used to format the mV signal of the analog output. The A and B
coefficients are used to adjust the calibration curve of the analog output, and they are calculated as a
function of the output measured value.