Ahlborn ALMEMO 8590-9, Руководство по эксплуатации

Страница: 7 / 28

4. Introduction
7
4.1.1 Sensor programming
The measuring channels are programmed, completely and automatically, by the
ALMEMO® connectors. However, the user can easily supplement or modify this
programming via the interface.
Measuring ranges
Appropriate measuring ranges are available for all sensors with a non-linear
characteristic, e.g. 10 thermocouple types, NTC and PT100 probes, infrared
sensors, and flow transducers (rotating vanes, thermoanemometers, Pitot
tubes). For humidity sensors additional function channels are available for cal-
culating humidity variables such as dew point, mixture ratio, vapor pressure, and
enthalpy. Even complex chemical sensors are supported. Measured values from
other sensors can also be acquired using the voltage, current, and resistance
ranges with individual scaling in the connector. Existing sensors can also be
used - so long as the appropriate ALMEMO® connector is connected via its
screw terminals. For digital input signals, frequencies, and pulses, adapter con-
nectors are available with an integrated microcontroller. It is thus possible to
connect virtually any sensor to any ALMEMO® measuring instrument and to
change sensors without the need for any extra settings.
Function channels
Maximum, minimum, average values and differences from certain measuring
points can be programmed as function channels, also internal channels, and
can be processed like normal measuring points. There are also function chan-
nels available for special measuring tasks, e.g. to determine the temperature
coefficient Q/

T and wet bulb globe temperature.
Units
The 2-character units display can be adapted for each measuring channel so
that both the display and via interface always indicate the correct units, e.g.
when a transmitter is connected. Conversion between °C (Centigrade) and °F
(Fahrenheit) is performed automatically.
Measured value designation
Each sensor is identified by means of a 10-character alphanumeric name. This
name is entered via the interface and will appear via interface and in the soft-
ware.
Correction of measured values
The measured value on each measuring channel can be corrected both in terms
of zero-point and gain; this means that even sensors usually requiring initial ad-
justment (e.g. expansion, force, pH) can be freely interchanged. Zero-point cor-
rection and, partly at least, gain adjustment can be performed at the touch of a
button.
A
new feature is the possibility of user-defined linearization or multi-point cali-
bration.