TPM 057 Version 1.0, May 31, 2018 Page | 4
OVERVIEW
3 SYSTEM OVERVIEW
Figure 1 TD 100 System
The TD100 system consists of a TD100 transmitter, dual-rod probe, a Finch II or 5332INT In-Cab display.
The TD100 system continuously measures liquid level in the tank and transmits volume information to a
display. Relays within the displays can be programmed to indicate Spill, High-High (HH), and system Fail
alarms to external devices such as overfill prevention valves, lights, horns and stationary loading
controls. HH is normally the first shutdown level; Spill is a backup level slightly higher on the probe than
HH, while Fail indicates failure of the TD100 system. Activation of any alarm halts loading to prevent a
dangerous overfill condition or spill at the loading facility. In addition, Fall and Fill alarms, managed by
settings stored in the Finch II display, can control relays that indicate a pre-set, increasing Fill or
decreasing Fall level to warn of an approaching fluid level while loading or unloading product .
The TD100 transmitter uses Guided Wave RADAR (GWR) to measure the liquid level in a tank. It does not
use any moving parts for level measurement. The TD100 transmits a continuous stream of radio
frequency pulses into the probe. These pulses travel along the probe and part of the pulse energy is
reflected back to the transmitter when encountering the surface of the liquid in a tank. The time delay
between the transmit pulse and reflected pulse is used to calculate the distance from the tank top
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