Omega FTB600B User Manual

Page 11

FTB600B Series

Infrared Sensors

Section 4 - Infrared Sensor

A. Supply Voltage

24 Vdc. Do not exceed 24 Vdc. Doing so can cause overheating and
eventual failure of all PC boards. Printed circuit boards are non-
repairable.

B. Frequency Output

1. Square wave pulse, unscaled (See Figure 4-1)

2. Output impedance 75 ohms

3. Directly proportional to flow rate

4. Output - dc frequency

5. Offset 0.64 volts

6. Peak voltage = Supply voltage - 1.2 volts

7. Peak to peak voltage Supply voltage - 1.2 volts - 0.64 volts

8. Output signal cycle 66.7% (i.e. at 100 Hz there is a 6 millisecond “on”

time and a 4 millisecond “off” time)

9. TTL/CMOS circuit compatibility. The FTB600B Series has an

operational amplifier output, which has a high input impedance and a
low output impedance.