CHAPTER 3 - OPERATION
FLUID COMPONENTS INTL
3. Operation
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.
Factory Default Jumper Configuration
Unless a custom factory setup or calibration is specified, the instrument is delivered in a standard factory
configuration. The standard default jumper configuration is shown in Table 3-1.
Table 3-1. Standard Jumper Default Configuration
Input Power
230 Vac (J2, J5 and J6).
Heater Power
FLT93-S
0.75 watts for air or liquid level applications.
(J13)
FLT93-F
0.25 watts for air or liquid level applications.
(J14)
Number of Alarms
Two (J23). Each alarm has one set of SPDT contacts.
Alarm No. 1 Red LED
Set Point Pot. R26
Set to monitor flow or level signals (J20). Relay energized at
flow or wet (J27).
Alarm No. 2 Green
LED Set Point Pot.
R25
Set to monitor temperature signals (J19). Relay energized
below temperature (J25).
Set point at approximately:
250 F (121 C) for standard temperature,
500 F (260 C) for medium temperature,
850 F (454 C) for high temperature (FLT93-S Only).
If the order included custom factory setup and calibration, leave all settings alone. The instrument is ready for
service without changes.
If custom factory setup or calibration was not ordered, configure the control circuit using the jumper tables
(Tables 3-2 to 3-6) and then follow the set point adjustment section that is appropriate for the application.
Configuration Jumpers
If the order did not specify for the control circuit to be factory configured, the standard configuration can be changed
using Figure 3-1 and Table 3-2 though Table 3-6. The factory default configuration is shown as being underlined.
Heater Cut-Off
The 5294 control circuit has a heater cutoff switch that limits the skin temperature of the sensing element to a
temperature differential of approximately 150°F (66°C) above the process temperature. In the case where the
instrument is used as a gas flow switch, and the heater wattage is set too high, the temperature differential (
D
T)
between the RTDs may exceed the usable input range of the control circuit. The usable input range can also be
exceeded in the case where the instrument is used in liquid flow applications where the heater wattage is set at the
highest value, and when the sensing elements go dry. When the temperature differential is less than 150°F (66°C)
the heater automatically turns back on. The yellow power indicator LED (DS3) turns on and off with the heater for a
visual indication of the heater state. The LED will alternate between on and off until the condition iss corrected.
Doc. No. 06EN003246 Rev. B
3 - 1
FLT
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Series FlexSwitch
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