Operation, Factory default jumper configuration, Configuration jumpers – Fluid Components International FLT Series User Manual
Page 19: Heater cut-off
CHAPTER 3 - OPERATION
FLUID COMPONENTS INTL
Doc. No. 06EN003246 Rev. B
3 - 1
FLTÔ Series FlexSwitchÔ
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
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 (DT)
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.
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