Delta OHM HD2817T Series, Manual

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10. Current and voltage analog outputs
The instruments have 3 analog outputs that can be configured as voltage or current outputs:
0…20mA, 4…20mA, 0…10Vdc or 2…10Vdc.
Each analog output can be associated to one of the following physical quantities:
•
Relative Humidity RH,
•
Absolute Humidity AH,
•
Mixing Ratio MR,
•
Dew Point TD.
•
Temperature T,
•
Wet bulb temperature Tw
The physical quantities associated to the three A1, A2 and A3 analog outputs appear,
respectively, in the first, second and third line of the display.
The relationship between measurement range of the input physical quantity and the analog
output range (0…20mA, 4…20mA, 0…10Vdc, 2…10Vdc) can be configured from the menu.
To configure the outputs:
16. Use the dip-switches A1, A2, A3
17. Set the “ CONF. OUT ” >> “ Output Analog 1-2-3 ” menu item on the instrument or use the
PC through the DeltaLog12 software.
The various combination are outlined in the following table in which the relevant output is
reported according to the menu choice.
“Current/Voltage out” menu item 0...20mA/0...10Vdc 4...20mA/2...10Vdc
Position of dip-switches A1, A2, A3 Idc Vdc Idc Vdc
Selected output 0…20mA 0…10Vdc 4…20mA 2…10Vdc
You can simultaneously use current and voltage outputs provided that they belong to the same
group selected from the menu, e.g. the 0…20mA and 0…10Vdc or the 4…20mA and 2…10Vdc
outputs. You cannot select the 0…20mA and 4…20mA or 0...10Vdc and 2…10Vdc outputs.
In case of error, e.g. sensor fault or violation of the measurement range set from the
menu, the corresponding analog output shifts to 22mA (current) or 11Vdc (voltage).