10 TX Thermal Disperson Level Switches | Operating instruction manual
4.1 Second Switchpoint Option Board (Top Board)
The TX-2000 option board plugs into the TX-1000 main electronics module. It is mounted directly above the main
module. It has two 3 pole terminal blocks that connect to the board’s double-pole double-throw relay contacts. These
contacts can be set to switch at a set point that is independent of the setting on the main board.
The second set point is controlled by the board’s potentiometer R16. The board also has a 2 pole terminal block for an
amplied millivolt-volt output of the delta voltage, that is between the Active and Reference sensors. The output is ap-
proximately 3 times that of the delta voltage. The output has an inverse relationship to ow and is not linear (the output
voltage decreases as ow increases). The amplied output does not apply when used as a temperature switch.
In addition, the board also has 6 jumper terminals JP8 through JP13 that allow you to set up the electronics for Liquid
Flow, Air Flow, Level (Granular Solids & Liquid) and Temperature as follows:
Switch set for Liquid Flow - Default (Fail Safe Low)
JP11: Relay setting as shown for State A
Default: Energizes above ow set-point
Switch set for Air Flow & Level (Fail Safe High)
JP11: Relay setting as shown for State B Energizes
when DRY or below ow set–point
Switch set for Temperature: uses only the reference
sensor (STS or RTD)
JP11: Set for State A or B (as shown above)
To energize below or above setting of R16
State A: Energize when temperature is above set-point
State B: Energize when temperature is below set-point
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