Fluid Components International FR73B Manual Troubleshooting - Manual

Doc. No. 06EN003281 Rev. - 5 - 1 Model FR78B Flow Switch/Monitor
CHAPTER 5 - TROUBLESHOOTING FLUID COMPONENTS INTL
5. Troubleshooting
Warning: Only qualified personnel should attempt to test this instrument. The operator assumes all
responsibilities for safe practices while troubleshooting.
Tools Needed
Digital Multimeter (DMM)
Quick Check
Check the jumper positions of J12 and J13. If present, check the jumper positions of J16 and J17. Jumper J12 and
J17 energize the relay(s) at flow or wet. Jumpers J13 and J16 energize the relay(s) at no flow.
Check that the control circuit is firmly seated into it's socket.
Check if power is present and customer fuses are good, if they are used.
Follow the trouble shooting flow chart in Figure 5-1 near the end of this chapter.
Non-maintenance Observations
At this point, observe the system setup to verify operation. No disassembly or testing is required at this time.
Check Serial Numbers
Verify that the serial number of the flow element and the control circuit are the same when the instrument is used
with the remote enclosure option. The flow element and the control circuit are a matched set and cannot be
operated independently of each other.
Check Input Power
Verify that the correct power source is turned on and connected.
Check the Instrument Installation
Review the information on instrument installation in Chapter 2 to verify correct mechanical and electrical
installation.
At the time of order, the flow element placement should have been determined. However, if not, the flow element
should be mounted at least 20 diameters downstream and 10 diameters upstream from any bends or interference in
the process pipe or duct for best accuracy.
Check for Moisture
Check for moisture on the control circuit. Moisture on the control circuit may cause intermittent operation.
If a component of the process media is near it's saturation temperature, it may condense on in the flow element
tubing. Place the flow element where the process media is well above the saturation temperature of any of the
process gases.