3.0 301 Controller
3.9.2
Changing the Over-Temperature Limit
Note: If protection of the sample being processed is required, the over-temperature
limit is normally set 15 °C above the temperature setpoint of the controller. If
protection of the furnace or oven is required, the over-temperature limit is normally set
15 °C above the maximum setpoint of the furnace or oven.
l
Start at the home display.
l
Press and hold the Over-Temperature key.
l
Repeatedly press the Page key until
Ot
shows on the dis-
play.
l
Use the up and down Arrow keys to change the offset
value.
A single press shows the current setting. To alter either keep pressed or press again.
The value will then be stored without any further input.
3.9.3
Checking the Over-Temperature Sensor Temperature
l
Start at the home display.
l
Press and hold the Over-Temperature key.
l
Press and hold the Page key for 1.5 seconds.
l
Current temperature (
PV
) is displayed for 1 second, fol-
lowed by the over-temperature sensor value for 3
seconds; this sequence is then repeated.
34
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