FLUID COMPONENTS INTL
CHAPTER 5 - TROUBLESHOOTING
Check Application Design Requirements
Application design problems may occur with first time application instruments, although the design should also be
checked on instruments that have been in operation for some time. If the application design does not match field
conditions, errors occur.
1. Review the application design with plant operation personnel and plant engineers.
2. Ensure that plant equipment such as pressure and temperature instruments conform to the actual conditions.
3. Verify operating temperature, operating pressure, line size, and process medium.
If conditions and specifications are satisfactory, then refer to the troubleshooting chart in the back of this chapter
for troubleshooting suggestions.
Troubleshooting the Flow Element
Use Tables 5-1 and 5-2 to determine if the flow element is wired correctly or has failed. Turn off the input power
to the instrument. Unplug the control circuit from its socket and measure the resistances below from the terminal
block socket.
If the instrument is set up in remote configuration (flow element enclosure seperate from the control circuit
enclosure), and the ohm readings are incorrect disconnect the flow element cable at the local (flow element)
enclosure. Measure the resistance as shown in Table 5-2. If the resistance is correct then the cable between the
enclosures is probably bad or not connected properly (loose, corroded, or connected to the wrong terminal).
Table 5-1. Resistances at Control Circuit Terminal Block Socket
NOMINAL CONTROL CIRCUIT RESISTANCE
LUG
NUMBER
RESISTANCE
7 TO 8
1.1 K OHM
7 TO 9
2.2 K OHM
7 TO 10
110 OHM FOR FLT93-S
560 OHM FOR FLT93-F
8 TO 9
1.1 K OHM
Table 5-2. Resistance at Flow Element Enclosure Terminal Block (Remote Applications Only)
NOMINAL RESISTANCE AT LOCAL ENCLOSURE TERMINAL BLOCK
TERMINAL NO.
RESISTANCE
1 TO 2
110 OHM FOR FLT93-S
560 OHM FOR FLT93-F
3 TO 4
1.1 K OHM
3 TO 5
2.2 K OHM
4 TO 5
1.1 K OHM
.
SHIELD CONNECTED TO CONTROL CIRCUIT SOCKET ONLY NO
CONNECTION TO LOCAL ENCLOSURE OR ITS TERMINAL BLOCK.
Troubleshooting the Flow Transmitter
With power applied measure 9 volts DC ±2% (8 to 10 volts) from Plug P1 Pin 1 to Pin 4. See Figure 3-2 for the
location of P1.
FLT
Ô
Series FlexSwitch
Ô
5 - 2
Doc. No. 06EN003247 Rev. B
