Delta OHM HD2817T Series, Manual

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For correct functioning, abide by the load resistance specifications concerning the
analog outputs reported in the technical information .
10.1. Numerical example
Let’s suppose you need to connect the HD2817T to a three-input indicator/regulator using the
three 4...20mA current outputs for relative humidity, temperature and dew point, and that the
ratio between the physical quantities input range and the 4...20mA output range is the one
reported in the following table:
Input Analog output
0...100%RH A1 = 4...20mA
0...150°C A2 = 4...20mA
-20...+80°C Td A3 = 4...20mA
Procedure
1.
Connect the HD2817 to the indicator/regulator as illustrated in the picture.
2. Set the dip-switches A1, A2, A3 to “ Idc ” (current).
3. Press MENU, use the
 
arrows to select “ CONF. OUT ” and confirm with ENTER.
4. Use the
 
arrows to select “ Output Analog 1-2-3 ” and confirm with ENTER.
5. Use the
 
arrows to select “ Current/Voltage out ” and confirm with ENTER.
6. Use the
 
arrows to select “ 4...20mA/2...10Vdc ” and confirm with ENTER.
7. Press ESC to return to the previous menu.
8. To set the A1 output, use the
 
arrows to select “ Out Analog 1 ” and press ENTER.
9. Use the
 
arrows to select the “ Mode” line and press ENTER: the Out 1 - Mode menu
will open.
10. Use the
 
arrows to select the “ RH Rel. Humidity ” item and press ENTER. An asterisk
will appear near the selected item. Press ESC to return to the previous menu.
11. Use the
 
arrows to select the Range values line and press ENTER: the “ Out 1 - RH
Range ” menu will open.
12. The value near Scale low value will blink: use the
 
arrows to set the value 0.0 and
confirm with ENTER.
Dew point
Relative humidity
Temperature
Indicator/regulator