EF-Series Instruction Manual
Rev 2/01 2-23
2.5.6 Discrete Output Wiring
A discrete output is provided on the Main Electronics Board in the P10 terminal block. Refer to Figure
2-7. The typical application for this output is a sampler or odorizer control, although it may be used
for other purposes.
The DO uses a P-channel MOSFET to switch current-limited (300 mA) battery power to the positive
terminal. The negative terminal is internally connected to battery negative. A blocking diode, a 22-
volt transorb, and a back-EMF diode are included to protect the flow computer electronics.
Because the output is not isolated, care must be used to ensure that the operation of the load does not
affect the operation of the EF-Series unit. This may include installation of back-EMF diodes and
MOVs on the load. The load should be connected as follows:
♦
DO + Positive load
♦
DO - Negative load
Figure 2-7. Discrete Output Terminal Wiring
Odorizer,
Sam
le Valve…
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