
DOTX-45 Dissolved Oxygen System Part 5 – Sensor Assembly
DOTX-45 18 -
Figure 4-2 Submersible Sensor Connection
4.21 Load Drive
The amount of resistance that the analog output can drive in the 115 VAC
version is fixed. However, in the two-wire configuration, the load-drive level is
dependent on the DC supply voltage provided to the controller.
The two-wire instrument can operate on a power supply voltage of between 16
and 35 VDC. The available load drive capability can be calculated by applying
the formula V/I=R, where V=load drive voltage, I=maximum loop current (in
Amperes), and R=maximum resistance load (in Ohms).
To find the load drive voltage of the two-wire DOTX-45, subtract 16 VDC from the
actual power supply voltage being used (the 16 VDC represents insertion loss).
For example, if a 24 VDC power supply is being used, the load drive voltage is 8
VDC.
The maximum loop current of the two-wire DOTX-45 is always 20.00 mA, or .02
A. Therefore,
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