12
5.
INTRODUCTION
The data logger
ALMEMO
®
2690-8 is a new instrument from the unique product
range of measuring devices that are all equipped with the ALMEMO® connector
system, which has been patented by Ahlborn GmbH. The intelligent ALMEMO®
connector provides important advantages with regard to the connection of sen-
sors and peripherals as all parameters are stored in an EEPROM within the
connector. As a result, the programming that usually has to be performed for the
connection is not required. All sensors and output modules can be connected
to all ALMEMO® measuring devices in the same way. The operation and pro-
gramming is identical with all units. Therefore, all of the ALMEMO® measuring
system items listed below are described, in detail, in a separate ALMEMO®
manual that is supplied with every device:
Detailed description of the ALMEMO® system (manual section 1)
Overview of the device functions and measuring ranges (manual section 2)
All sensors with basic principles, operation, technical data (man. section 3)
The options for connecting existing sensors (manual section 4)
All analog and digital output modules (manual section 5.1)
The interface module RS232, fiber optics, Centronics (manual section 5.2)
The entire ALMEMO® networking system (manual section 5.3)
All functions and their control via the interface (manual section 6)
A complete interface command list with all print outputs (manual section 7)
These operating instructions only cover features and controls that are specific
for a certain device. As a result, many sections will often provide a note referring
to the more detailed description within the manual (man. sect. x.x.x).
5.1
Functions
New data logger ALMEMO
®
2690-8A now comes fitted with an 1024-KB
EEPROM sufficient for some 200,000 measured values, a low-power A/D con-
verter, and integrated charge circuitry for recharging the batteries. The meas-
uring possibilities are virtually unlimited; there are 5 electrically isolated meas-
uring inputs suitable for all ALMEMO
®
sensors, or 20 channels in the sensor
connectors and 4 device-internal function channels - with over 70 measuring
ranges. For operation purposes the device incorporates an LCD graphics dis-
play and a softkey keypad with cursor block. The display can be adapted by
means of configurable user menus to suit any application. Two output sockets
allow for connecting any ALMEMO® output modules, for example, the digital
interface, memory card, analogue output, trigger input or alarm contacts. Sev-
eral devices can be networked by simply connecting them with network cables.