Thermo Scientific DensityPRO-T - Current Output; Wiring the Optional ISIO Boards

Wiring
Wiring the Optional ISIO Boards
Wiring the
Optional ISIO
Boards
Current Output
There are two configurations available for the 4–20 mA current output on J3 port of
the ISIO PCA.
– Intrinsically safe, isolated, loop-powered (default)
– Intrinsically safe, isolated, self-powered
All configurations can drive a 750-ohm maximum load over the full current output
range. The current output is programmable between 3.8 and 20.5 mA. The current
output has a fault low condition of 3.6 mA or less and a fault high condition of 20.8
mA or greater.
J3 is a standard 4–20 mA output with no Fieldbus options. The entity parameters are
as follows:
– Vmax = 35.25 V
– Imax = 200 mA
– Ci = 0 nf
– Li = 0
– Pmax = 0.81 W
The default current output configuration is isolated, loop-powered.
The figures below demonstrate the wiring configurations possible using the J3 ports on
the ISIO PCA.
Figure 4-18. Optional 4–20 mA Output, Isolated Loop-Powered
Figure 4-19. Optional 4–20 mA Output, Isolated Self-Powered
4-12 DensityPRO Installation Manual Thermo Scientific