BINDER UF V 500 - Manual (Page 63)

UF V (E2+E2.1) 03/2013 page 63/112
10.4 Temperature tolerance range alarm (too high and too low temperature)
The temperature has risen above or fallen below the temperature alarm threshold.
Figure 42: Temperature tol-
erance range alarm
• Alarm message “ tol” immediately
No alarm signal is emitted during the temperature delay time after the outer door is closed
• LED indication immediately: LED flashes, LED flashes
• Audible alarm: buzzer (intermittent sound) immediately
• Switching the zero-voltage relay alarm output
Actions:
•
Factory setting of the operating function “AL.1” (temperature alarm threshold) is ±6 K.
• Use the actual temperature displayed on the controller to verify whether the temperature alarm
threshold has been breached, i.e., too cold or too warm.
Temperature too low (under temperature alarm):
•
Input of large quantities of samples which were precooled with liquid nitrogen. Reset the alarm by
pressing "EXIT".
• Possible cause: Continuous operation of the refrigeration machine after failure of a temperature sen-
sor (chap. 10.8). Contact BINDER Service.
Temperature too high (over temperature alarm):
•
Check whether the outer door was open for a long time or is not closed properly. Close the door if
necessary.
• Check the door gaskets for damage. Replace any damaged gaskets.
• Check whether there is icing around the gaskets. Defrost, if necessary.
• Check whether samples were inserted into the freezer that may release heat.
• Check the ambient conditions. Protect the freezer from direct sunlight. Ensure sufficient ventilation
around the installation location to prevent any buildup of heat in the unit.
• If these points do not reveal the source of the fault, it may be that the unit is faulty. Please contact
BINDER Service.
If the same alarm recurs, please contact BINDER Service.