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4. Introduction
of connecting a rechargeable battery module.
4.1.1 Sensor programming
The measuring channels are programmed, completely and automatically, by
the ALMEMO ® connectors. However, the user can easily supplement or modi-
fy 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 val-
ues 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 connectors are available with an integrated microcontroller. It is thus
possible to connect virtually any sensor to any ALMEMO ® measuring instru-
ment and to change sensors without the need for any extra settings.
Function channels
Maximum, minimum, average values and differences from certain measuring
poins can be programmed as function channels, also internal channels, and
can be processed like normal measuring junctions. There are also function
channels available for special measuring tasks, e.g. to determine the tempera-
ture coefficient Q/T and wet bulb globe temperature.
Units
The 2-character units display can be adapted for each measuring channel so
that both and via interface always indicate the correct units, e.g. when a
transmitter is connected. Conversion between °C and °F is performed auto-
matically.
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 adjustment (e.g. expansion, force, pH) can be freely interchanged. Zero-
point correction 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-
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