8. Connecting sensors / transducers
8.2 D6 sensors
ALMEMO
®
D6 sensors are housed in a partly light-gray, partly dark-gray case;
they are completely autonomous measuring modules not only for digital but
also for analog sensors; they can, independently of the device, handle new
measuring quantities and ranges with special measured value processing and
various forms of compensation. As regards measured value processing D6
sensors are fully compatible with standard sensors - except for multi-point cali-
bration and smoothing; however, quantity and range configuration and parame-
trization must be performed via the special 'Sensor configuration' menu in the
ALMEMO
®
Control software either on the V7 device itself or, using a USB ad-
apter cable, directly on the PC.
(see additional instructions 'Digital ALMEMO
®
D6 sensors').
8.3 D7 sensors
ALMEMO
®
D7 sensors are housed in a dark-red case; they too are completely
autonomous measuring modules for digital and for analog sensors - but offer
substantially enhanced properties. The conversion rate can be set from 1 milli-
second up to several minutes with a resolution up to 8 digits. The number of
channels has, thanks to a new numbering scheme, been extended up to 10 per
sensor and up to 10000 per device. Channel designations can be up to 20
characters and units up to six characters in length. With D7 sensors up to four
primary channels can also be smoothed at the same time internally over the
averaging period. For the purpose of setting individual parameters (e.g. quan-
tities and ranges, averaging period) special menu 'Sensor configuration' is pro-
vided by the sensor itself. (see additional instructions 'Digital ALMEMO
®
D7
sensors') All measured value processing is performed in the sensor itself; the
resulting data is transferred no longer via an I2C bus but via the serial interface
alone. For this reason and because of the expanded data format D7 sensors
can only be operated in conjunction with a V7 device or directly on a PC. For
D7 sensors dedicated extension cables and an adapter cable for electrical iso-
lation are available.
18 ALMEMO
®
809
