Wiring
Wiring the Optional ISIO Boards
J4 is an isolated 24 volt output with a zener barrier output. The results of calculating
the values were very similar to the MTL 787 barrier. The MTL document “Cable
Parameters and Permitted Combinations” was used to determine the C and L values
below.
– Vo = 28.35 V
– Io = 106 mA ≥ fuse rated for 63 mA
– Ohm = 270
– Co = 79 nf
– Lo = 2 mH
– L/R ratio (uH / ohms) = 56
– Po = 1.02 W
The figures below demonstrate two of the wiring configurations possible using the J11
ports on the ISIO PCA.
J11 is a 4–20 mA output port that may also be used to support the HART
Communication protocol. For information on configuring wiring to support a HART
Communication protocol, see HART
®
Communications. The entity parameters for J11
are as follows:
– Vmax = 35.25 V
– Imax = 200 mA
– Ci = 0 nf
– Li = 0
– Pmax = 0.81 W
Figure 4-20. Optional 4–20 mA Output, Isolated Loop-Powered
Figure 4-21. Optional 4–20 mA Output, Isolated Self –Powered
Thermo Scientific DensityPRO Installation Manual 4-13
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