C.B.S. Scientific TTGEK-2401-220 - Manual (Page 23)

TTGE Instruction Manual, version 8/30/2011
23
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3.2 Heater/Stirrer Set-Up and Programming – continued
3.2v 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.
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 is controlled using the internal bath temperature. “Internal” is highlighted
on the temperature display.
Control of the bath heating 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 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.