Vaisala GMP252 - Analog Output Overrange Behavior; Analog Output Overrange Example; Table 4 Analog Output Overrange Clipping and Error Limits

More Information
‣
Configuration Registers (page 114)
‣
Configuring Filtering Factor with Indigo (page 77)
2.7 Analog Output Overrange Behavior
The analog output of the probe has a defined behavior when the values measured by the
probe are outside the scaled analog output range. At first, the output is clipped when the
measurement exceeds a set limit (the measurement continues, but the output does not
change from the clipped value).
When the measurement exceeds the second limit (error limit), the analog output switches to
the error state
defined for the output.
The table below lists the clipping and error limits and default error state outputs for the
analog voltage and current outputs.
Table 4 Analog Output Overrange Clipping and Error Limits
Output Voltage / Current Clipping Limit Error Limit Default Error State Output
0 ... 5 V >5 % >10 % 0 V
0 ... 10 V >1 % >10 % 0 V
0 ... 20 mA >5 % >10 % 23 mA
4 ... 20 mA >5 % >10 % 2 mA
The same clipping and error limits are applied when the measured value drops back to the
scaled range: at first the output returns to the clipped value from the error state, and then to
normal output.
Clipping and error state limits
dier for 0 ... 10 V and 0 ... 5 V outputs. For 0 ... 10 V output
the limits are 1 % and 10 %, and for 0 ... 5 V output the limits are 5 % and 10 %.
When setting the error output voltage (amode command), note that the probe's
maximum voltage output is 10.325 V.
More Information
‣
Analog Output Error State (page 100)
‣
Analog Output (page 44)
2.7.1
Analog Output Overrange Example
Consider a probe with 0 ... 5 V output, scaled to 0 ... 2000 ppmCO
2
.
GMP252 User Guide M211897EN-D
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