Ahlborn ALMEMO 6290-7B, Руководство по эксплуатации, Страница: 7 / 53

Limit Values and Alarm
Two limit values (max and min) can be set for each measuring channel. Alarm
contacts that can be individually allocated to limit values can be activated by
means of relay output modules if a limit value is exceeded. As a standard, the
hysteresis is set to 10 digits, however, it can also be adjusted. Furthermore,
limit value exceeding can also be used to start or stop a data logging.
Plot Range
For accurate graphical outputs the plot range can be programmed for each
channel with plot range start and plot range end.
Sensor Locking
All sensor data stored in the EEPROM of the connector can be protected
against undesired access by means of a graded locking function.
MEASUREMENT
Up to 4 measuring channels are available for each transducer, i.e. it is also
possible to evaluate double sensors, individually scaled sensors, or sensors
with function channels. The measuring channels can be successively selected
forwards or backwards via keyboard. The selected measuring point can be
scanned with a conversion rate of 2.5 or 10 measurements/second. The
measured value is calculated and indicated on the display or, if available,
provided on the analogue output.
Measured Value
A continuous presentation of measuring data from the selected measuring
point is provided and also includes automatic zero point correction and optional
correction of the measured value or new scaling.
A sensor breakage condition is, with most sensors, automatically detected
(exception: connectors with shunts, dividers or additional electronics).
Measuring Functions
Special measuring functions are required for some sensors in order to achieve
an optimal acquisition of measuring data. The cold junction compensation is
available for thermocouples, a temperature compensation for dynamic
pressure and pH and conductivity probes, and an atmospheric air pressure
compensation for humidity sensors, dynamic pressure sensors and O
2
sensors. With infrared sensors the parameters zero point and slope correction
are used for background temperature and emissivity factor.
Analogue Output and Scaling
By means of analogue start and analogue end the indicated measured value
can be scaled so that the resulting measuring range covers the full analogue
output range (2V, 10V or 20mA).
ALMEMO
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6290-7B 6
Functions