4. Safety instructions
4.1 Special notes on use
● If the device is brought into the work-room from a cold environment there is
a risk that condensation might form on the electronics. In measuring opera-
tions involving thermocouples pronounced changes in temperature may
cause substantial measuring errors. You are advised therefore, before star-
ting to use the device, to wait until it has adjusted to the ambient tempera-
ture.
● Before using the mains adapter make sure that the mains voltage is suita-
ble.
● Be sure to observe the maximum load capacity of the sensor power supply.
● Sensors with their own integrated power supply are not electrically isolated
from one another.
● Do not run sensor lines in the vicinity of high-voltage power cables.
● Before you touch any sensor lines, ensure that all static electricity has been
discharged.
5. INTRODUCTION
The V7 measured data acquisition module ALMEMO
®
809 is a brand new
member in our family of unique measuring instruments - all equipped with Ahl-
born's patented ALMEMO
®
plug system. The ALMEMO
®
plug offers - and has
offered for the last 20 years - decisive advantages when connecting sensors
and peripherals because all parameters are stored in an EEPROM located on
the connector itself; repeated programming is thus no longer necessary. Any
sensor or output module can be connected to any ALMEMO
®
measuring instru-
ment - all in the same way.
However, the new generation of intelligent digital ALMEMO
®
D7 sensors, ope-
rating in conjunction with our V7 measuring instruments, overcomes all limitati-
ons to which the system was previously subject. Each such sensor, irrespecti-
ve of the device's measuring quantities and ranges, can operate as an autono-
mous measuring system with up to 10 channels and provide completely new
measurable variables with all necessary control functions, calculating functi-
ons, or compensation values, with a range of values up to 8 digits and at
speeds up to 1 kHz. What is so special about this new generation is that,
thanks to the individual sampling rates used, high-resolution variables, both
quick and slow, can now very easily be measured and recorded together. Indi-
vidual functions can be parametrized via a menu stored in the plug itself. To
facilitate identification the quantity abbreviations and units have been extended
to 6 digits and the measuring point comments to 20 characters. All sensors
belonging to the preceding V6 generations can be used on V7 devices but the
new D7 sensors are not backwardly compatible with V6 devices. However,
they can be operated directly on the PC via the serial interface and an adapter
8 ALMEMO
®
809
