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Transfer curve
The curve below gives the transmitter output current as a function of gas
concentration. In the event that the user connects the transmitter to a non-
Oldham central controller, the user must ensure that the transfer curve is
compatible with the equipment's input characteristics to correctly interpret the
data coming in from the transmitter. Similarly, the central controller must
provide sufficient voltage to compensate for any voltage drop caused by the
cable.
Figure 43: transfer curve for a 4-20 mA detector.
Output
current (mA)
% range
4 – Installation
60
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