Chart Environmental Chambers | Operation |
2.Control Power (OFF, ON)
This switch controls the 24vdc control power in the control system. If this switch is turned OFF, all control functions will be disabled. The temperature controllers are powered from a 115vac circuit, so they will remain powered up even if the control power switch is turned OFF, however no heating, cooling, etc will be able to take place.
3.Chamber Reset (push button)
This button will be illuminated under normal operation. If the Temperature Safety controller goes into a high or low temperature alarm, this button will no longer be illuminated. The respective heating or cooling action will not be enabled until the alarm condition is no longer present and the Chamber Reset button has been pressed.
4.Air Safety (up, down; touch pad)
This controller is located inside the control box and is not to be adjusted by the operator. The controller has
5.SERIAL COMM (communications connection)
This connector is provided on the back of the control box for future serial communications with the Watlow controller. The cable that is attached to this connector is coiled up inside the control panel1.
CAUTION: If the chamber is left with the circulation fan running, and either no temperature set point, or no liquid nitrogen supply, the internal chamber temperature will rise. This rise in temperature could damage product inside the chamber if it is not controlled.
The following graph shows the rise in internal chamber temperature with the circulation fan running and no cooling output being applied. It is important to note that the circulation fan does generate a small amount of heat, which causes the internal chamber temperature to rise slightly from ambient to about 28°C. This data assumes the chamber started at ambient temperature, there was no live heat generating product in the chamber, and neither heat nor cool outputs are being applied.
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