Ahlborn ALMEMO 2590-2A - 13.12.3 Analog start and analog end; 13.12.4 Minimum sensor supply voltage

13. Sensor programming
62
Controlling a measuring operation
The exceeding of a limit value can be used not only for reporting an alarm but
also for controlling a measuring operation (see Manual 6.6.3). Commands can
be assigned to a limit value by means of the functions :
Action, maximum and Action, minimum Rxx
Start measuring operation at limit value, maximum :
7 Action, max : Start R--
Stop measuring operation at limit value, minimum :
7 Action, min : Stop R--
Manual inquiry at limit value, maximum :
7 Action, max : Manu R--
Zero-setting timer 2 at limit value, maximum :
7 Action, max : TZero R--
Execute macro 5...9 at limit value, maximum :
7 Action, max : Macro 5 R--
To set the action press : <SET>
To clear the action press <CLR>
13.12.3 Analog start and analog end
The analog output of measured values to the analog output modules (see Man-
ual Ch 5) or to the display as a bar chart must in most cases be scaled to a
particular subrange. You can do this by simply stipulating the start value and
end value of the range you want displayed. This range will then be mapped to
the analog range 2 V, 10 V, 20 mA or for the display with 100 pixels.
Program the analog output start 6 Analog start : 0.0 °C
Program the analog output end : 6 Analog end: 100.0°C
These two parameters, "analog output start" and "analog output end", are also
saved in the sensor EEPROM and can thus be individually programmed for each
channel; i.e. when channels are switched through manually each measurable
variable can be individually scaled.
The flag for toggling from 0 - 20 mA to 4 - 20 mA is programmed via the element
flags (see 13.12.8, 15.3).
13.12.4 Minimum sensor supply voltage
As with all ALMEMO
®
devices the sensor supply
voltage on the 2590A is monitored. The sensor
supply voltage is displayed in the
INFO menu
(see
10). Some sensors, however, will only operate
properly with their own supply voltage; this may
require e.g. a mains unit. To prevent measuring er-
rors the minimum
sensor voltage needed by each individual sensor can be entered in Sensor
programming. If the voltage drops below this value the measured value will be
treated as a sensor breakage and display ´L´ flashes (see 9.2).
To enter the minimum sensor supply voltage : Sensor voltage, min : 12.0 V
To disable voltage monitoring, to delete the value : <CLR>
Sensor voltage, min : ---- V