5. Introduction
13
5.1.1
Sensor Programming
The measuring channels are automatically programmed by the ALMEMO® con-
nectors. However, the user can easily complete or modify the programming via
keyboard or via interface.
Measuring Ranges
There are corresponding measuring ranges for sensors with a non-linear char-
acteristic such as 10 thermocouple types, Ntc and Pt100 sensors, infrared sen-
sors, and flow sensors (rotating vanes, thermoanemometers, pitot tubes). Hu-
midity sensors are available with function channels that also calculate humidity
data such as dew point, mixture ratio, vapour pressure and enthalpy. Even com-
plex chemical sensors can be used. The acquisition of measured data from
other sensors is easily possible by using the voltage, current and resistance
ranges with individual scaling in the connector. Existing sensors can be used
without problems. Only the corresponding ALMEMO® connector has to be con-
nected using its terminals. Furthermore, there are adapter connectors with an
own microcontroller for digital signals and for measuring frequencies and
pulses. This way, nearly all sensors can be connected to any ALMEMO® meas-
uring instrument and are interchangeable without requiring any settings.
Function Channels
Maximum, minimum, average values and differences of certain measuring junc-
tions can be programmed as function channels, also in device internal channels,
and can be processed like normal measuring junctions. Furthermore, function
channels for special measuring tasks are provided to determine the temperature
coefficient Q/
T and wet bulb globe temperature.
Dimension
The 2 digit dimension can be altered for each measuring channel so that the
display and via interface will always indicate the correct dimension, for example
when a transmitter is connected. The conversion from °C to °F is automatically
performed according to the dimension.
Name of Measured Values
For identification of the sensors a 10-digit alphanumeric name is provided. It is
entered via the keypad or the interface and appears on the display, via interface
and in the software.
Correction of Measured Values
For correcting measured values a zero point and slope correction can be applied
to the measured value of each measuring channel. This also allows for sensors
to be interchanged that usually, at first, require an adjustment (expansion, force,
pH). The zero point and the slope correction are virtually performed by the push
of a button.
Scaling
