Brookfield Bath, Model TC-602 - Manual (Page 25)

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4.11.10 Selecting the Temperature Probe (Internal or External)
The Probe sub-menu allows you to designate whether to control temperature using the internal bath
temperature or the fluid temperature at an external device. It is available on the Programmable
Controller only and requires the use of an optional external temperature probe.
NOTE: If an external temperature probe is not connected to the Controller, only “Internal” will be
available for selection. For information on connecting an external temperature probe, see Section 4.3.
When External is selected as the primary temperature probe, the Maximum Setpoint Differential
setting becomes available.
This allows you to set the maximum allowable difference between the set point temperature and the
internal bath temperature. It is intended as a safety feature to protect the internal bath from over-
heating or over-cooling in the event that the external temperature control set point cannot be
achieved. The Maximum Setpoint Differential value may be set from 1° to 10°C. The factory default
value is 10°C.
Temperature Control / Display When Using an External Probe
When the difference between the set point temperature and internal bath temperature exceeds the
programmed Maximum Setpoint Differential value, heating/cooling is controlled using the internal
bath temperature. “Internal” is highlighted on the temperature display.
Control of the bath heating/cooling rate will be based on the internal bath temperature until the
difference between the set point and the internal bath temperature is at the Maximum Setpoint
Differential value. When the heating/cooling rate is being controlled using the external bath
temperature, the word “External” is highlighted on the display.
NOTE: When the external temperature probe is in use, external bath temperature is displayed in
large numerals, regardless of whether temperature control is based on the internal or external bath
temperature.