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ELECTRA-flo
Air Monitor Corporation
116-053-00.P65 (7/06)
ELECTRA-flo
- IO&M Manual
6
SECTION 4 – INSTALLATION
4.5 – POWER/SIGNAL CONNECTIONS
Power wiring is done at terminal strip P8, and signal wiring is done at terminal strip P7. Both P7 and P8 are located in
the lower portion of the unit and are accessible by opening the front cover. See Figure 4.2 for location of P7 and P8. Two
conduit openings are provided for the power and signal wiring.
Figure 4.2
WIRING.
It is recommended that power wiring be 14 awg to 18 awg, and signal wiring should be 14 awg to 22 awg. 14
awg is the maximum wire gauge that the terminals can accommodate. No more than two wires should be connected
to any one terminal. To aid in the wiring of both power and signal wires, P7 and P8 are removable by pulling the terminal
strip straight up and off the circuit board. Once wiring has been completed, replace the terminal strip by aligning with
receptacle and pressing firmly.
POWER 24 VAC/DC (Terminals L and N, P8)
. Power required by the ELECTRA-flo must be connected to the two
terminals labeled L(+) and N(–). Earth ground should be connected to the terminal labeled G. Power Supply must be
20-28VAC or 20-40VDC.
OUTPUT #1 (Terminals 1 and 2, P7).
This output represents the measured airflow and is sourced (powered) by the
ELECTRA-flo. Output can be configured for 0-5VDC, 0-10VDC, or 4-20mADC. Review Factory Set-Up Information
Sheet for your configuration.
If output is to be 0-5VDC:
Position both jumpers on J3. See Figure 4.2.
If output is to be 0-10VDC:
Position both jumpers on J2. See Figure 4.2.
If output is to be 4-20mADC:
Position both jumpers on J4. See Figure 4.2.
OUTPUT #2 (Terminals 3 and 4, P7).
This output can represent the measured temperature and is sourced (powered)
by the ELECTRA-flo. Output can be configured for 0-5VDC, 0-10VDC, or 4-20mADC. Review Factory Set-Up Informa-
tion Sheet for your configuration.
If output is to be 0-5VDC:
Position both jumpers on J6. See Figure 4.2.
If output is to be 0-10VDC:
Position both jumpers on J5. See Figure 4.2.
If output is to be 4-20mADC:
Position both jumpers on J7. See Figure 4.2.
4.6 – DISPLAY CONTRAST ADJUSTMENT
To compensate for different ambient lighting conditions and viewing angles, the ELECTRA-flo display's contrast can be
adjusted for optimum visibility. Contrast is adjusted using potentiometer R13. Turn R13 clockwise to increase contrast
(darken characters relative to background) or counterclockwise to decrease contrast.