Sensor Connection; Standard Sensors (V5); D6 Sensors - Ahlborn ALMEMO 710 Operating Instructions Manual

Sensor connection

8. SENSOR CONNECTION
Virtually any ALMEMO ® sensor can be connected at any of ALMEMO ® input
sockets M0 to M9 (standard so-called V5 sensors and newer D6 and D7 digital
sensors included). The ALMEMO ® Manual includes detailed descriptions of
the comprehensive ALMEMO ® range of sensors (see Manual Ch. XREF) and
instructions for connecting your own existing sensors to ALMEMO instruments
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(see Manual Ch. 3). To connect your own existing sensors you simply need
the appropriate ALMEMO ® plug. All standard sensors with an ALMEMO ® plug
usually have the measuring range and units already programmed and can thus
be connected to any input socket without further adjustment. A mechanical
coding system ensures that sensors and output modules can only be con-
nected to the correct sockets. All ALMEMO plugs incorporate two snap-lock
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levers; these snap into position as soon as the plug is inserted into the socket,
thus preventing unintended disconnection if the cable is pulled accidentally. To
withdraw the plug both these levers must first be pressed in at the sides.
8.1 Standard sensors (V5), V6
ALMEMO ® standard sensors (V5) are housed in a light-gray case. The exclu-
sive source of their intelligence is an 2-KB EEPROM integrated in the sensor
plug, in which all channel settings are stored; the device is thus programmed
completely as soon as such a sensor is connected. With the newer V6 version
incorporating a 4-KB EEPROM (E4) multi-point calibration can be performed
on the sensors. Passive analog sensors are electrically isolated from one an-
other by means of photovoltaic relays; all signals in the device are converted
analog-to-digital. Digital sensors used for the quantities - frequency, pulse, or
DIGI - contain a microcontroller, which transfers digital signals to the device via
an I2C bus. Measured values are processed in synchrony with the conversion
rate (maximum 100 measuring operations per second) and at a resolution of
maximum ±65000 all in the device including linearization and various forms of
compensation.

8.2 D6 sensors

ALMEMO D6 sensors are housed in a partly light-gray, partly dark-gray case;
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they are completely autonomous measuring modules not only for digital but also
for analog sensors; they can, independently of the device, handle new measur-
ing ranges with special measured value processing and various forms of com-
pensation. As regards measured value processing D6 sensors are fully compat-
ible with standard sensors (except for multi-point calibration and damping); how-
ever, quantity configuration and parametrization can only be performed via spe-
cial menu ´Sensor configuration´ and using an adapter cable, the serial inter-
face, and a PC - or using a new V7 device. (see 13.1).
ALMEMO ® 710 19