Special functions
12.12.4 Minimum sensor supply voltage
As with all ALMEMO
®
devices the sensor sup-
ply voltage on the 2590 is monitored. The sen-
sor supply voltage is displayed in the
INFO
menu
(see 9). Some sensors, however, will only
operate properly with their own supply voltage;
this may require e.g. a mains unit. To prevent
measuring errors the minimum sensor voltage
needed by each individual sensor can be en-
tered in Sensor programming. If the voltage drops below this value the mea-
sured value will be treated as a sensor breakage and display ´L´ flashes (see
8.2).
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
12.12.5 Output function
If the current measured value is not actually needed but only the maximum,
minimum, average, or alarm value, this function can be programmed as output
function (see Manual 6.10.4). Saving, analog output, and digital output will then
only process the specified function value. As verification for the output function
being thus changed the measured value is shown with the symbols listed be-
low (see 8.2).
Examples
1. If measured values are being averaged over the cycle the only output value
of interest is the average value itself, not the last measured value. With a
data logger this saves memory capacity.
2. The analog measured value from dew sensor FH A946-1 is not really signif-
icant. I you set limit value, maximum to approx. 0.5 V and program the
"alarm value" function, you will then only receive the values 0.0% for dry
and 100.0% for dew.
Output function
Verification symbols Menu
Measured value
Output function: Meas
Difference
D
Output function : Diff
Maximum value
H
Output function : Max
Minimum value
L
Output function : Min
Average value
M
Output function : M(t)
Alarm value
A
Output function : Alrm
ALMEMO
®
2590
57
* SPECIAL FUNCTIONS 2 *
Sensor voltage, min : 12.0 V
1 Output function : MEAS
1 Reference channel 1: (01)
1 Multiplexer :
(B-A)
1 Element flags:
IR
Calibr. val: -12345 43210
Mªª Pª
Summary of Contents for ALMEMO 2590-2
Page 74: ...17 Appendix 17 4 Your contact 74 ALMEMO 2590...
Page 75: ...Your contact ALMEMO 2590 75...
Page 76: ...17 Appendix 76 ALMEMO 2590...
