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8. Sensor connection
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 mil-
lisecond 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 6 characters in length. With D7 sensors up to 4 pri-
mary channels can also at the same time be smoothed internally over the aver-
aging period. For the purpose of setting individual parameters (e.g. quantities,
averaging period) a special menu ´Sensor configuration´ is provided by the
sensor itself. (see 13.1) All measured value processing is performed in the
sensor itself; the resulting data is no longer transferred 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 di-
rectly on a PC.
8.4 Measuring inputs, additional channels
Measuring instrument ALMEMO
(1); to these, under the new channel numbering scheme, measuring channels
M0.0 to M9.0 are initially assigned. Whereas standard sensors can if neces-
sary provide up to 4 channels (M0.0 to M0.3, M1.0 to M1.3, etc.), D7 sensors
can provide up to 10 (M0.0 to M0.9, M1.0 to M1.9, etc.). The additional chan-
nels can be used in particular for humidity sensors with 4 measurable variables
(temperature / humidity / dew point / mixture ratio) or for function channels.
Each sensor can if necessary be programmed with several quantities or scal-
ing settings; 2 or 3 sensors, if pin assignment so permits, can be combined in a
single plug (e.g. RH / NTC, mV / V, mA / V, etc.). This device does not incorpo-
rate any internal channels. On the measuring instrument this gives the follow-
ing channel assignment :
V5-Sensors
10. chann.
...
5. chann.
0.3
1.3
4. chann.
3. chann.
0.2
1.2
0.1
1.1
2. chann.
1. chann.
0.0
1.0
M0 M1 M2 M3 M4
20
ALMEMO
®
710 incorporates 10 input sockets M0 to M9
D7-Sensors
4.9 5.9 6.9 7.9 8.9
...
...
4.4 5.4 6.4 7.4 8.4
2.3
3.3
4.3
5.3
2.2
3.2
4.2
5.2
4.1
2.1
5.1
3.1
2.0
3.0
4.0
5.0
M5 M6 M7 M8
®
710
9.9
...
...
...
...
9.4
6.3
7.3
8.3
9.3
6.2
7.2
8.2
9.2
6.1
7.1
8.1
9.1
6.0
7.0
8.0
9.0
M9
Sensor channels with
new channel numbering
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