Xylem 6308DT INDUSTRIAL DISSOLVED OXYGEN TRANSMITTERS - Manual (Page 18)

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VI) 4 - 20 mA Output
a) Isolation Voltage
The maximum isolation voltage of the 4-20 mA output is 500 VDC. The voltage
differential between the 4-20 mA output and the load should not exceed 500
VDC.
b) Output Load
The maximum load is 500Ω. Output current inaccuracies may occur for load
impedance in excess 500Ω.
c) DO Linear Output
1. The analog output will produce a linear analog output if the user selects
this option. The analog output will be dependent on the DO_4 mA setting,
DO_20 mA setting, and the current DO display. The DO LINEAR
analog output is based on the following equation:
mA(DO) = 4mA+(16mA)*(D(DO) - DO(4)) /(DO(20) - DO(4))
Where :
mA(DO) = analog output
D(DO) = current DO display
DO(4) = DO user setting for 4 mA
DO(20) = DO user setting for 20 mA.
Note :
• The range for 4mA and 20mA settings is 0.0 to 500.0% or 0.00 to
60.00 mg/L.
• The absolute difference of the 4mA and 20 mA settings must be
greater or equal to 1.0% or 0.10 mg/L or else the analog output will
be disabled.