Fluid Components International FLT Series - Manual (Page 41)

Doc. No. 06EN003247 Rev. B 5 - 1 FLTÔ Series FlexSwitchÔ
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.
Caution: The control circuit contains electrostatic discharge (ESD) sensitive devices. Use standard ESD
precautions when handling the control circuit. See Chapter 2, Operation, for ESD details.
Tools Needed
Digital Multimeter (DMM)
Quick Check
Verify that the control circuit is seated firmly.
LED DS3 should be lit when power is applied and in most cases it should not be blinking.
Ensure that the jumpers are in the correct position. See Chapter 3 for the correct positions.
(The power is factory preset for 220 Vac, the customer may need to reset jumpers for other power input.)
Ensure that the CALIBRATE - RUN switch is in the RUN position (switch S1 positioned toward the heat sink).
If LED DS3 flashes the heater power is set to high for most applications.
Check any customer supplied fuses.
See the troubleshooting chart in Figure 5-1 at 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 sensing element and the control circuit are the same number. The sensing
element and the control circuit are a matched set and cannot be operated independently of each other. The
exception to this is if a removal and replacement have been done for repair purposes. All calibrations and jumpers
must have been done and set.
Check Input Power
Verify that the correct power source is turned on and connected. Verify that the power jumpers are correct for the
application. See Chapter 3 for the correct positions.
Check the Instrument Installation
Review the information on instrument installation in Chapter 2 to verify correct mechanical and electrical
installation.
Check for Moisture
Check for moisture on the control circuit. Moisture on the control circuit may cause intermittent operation.
For normally dry conditions check for moisture on the sensing element. If a component of the process media is
near its saturation temperature it may condense on the sensing element. Place the sensing element where the
process media is well above the saturation temperature of any of the process gases.