BINDER KB 23 - Manual (Page 66)

KB (E3.1 + E5.1) 11/2014 page 66/100
Safety controller set-point types
Setting in the user level (chap. 10) of the RD3 program controller.
Limit Absolute maximum permitted temperature value.
Example:
Temperature set-point 40 °C / 104 °F
Limit value (safety controller set-point) set to 42 °C.
Offset Maximum over temperature above the active temperature set point. The maximum
temperature changes internally and automatically with every set-point change it.
Example:
Temperature set-point 40 °C / 104 °F
Offset value (safety controller set-point) set to 2 °C.
Regularly check the safety controller setting for set-point type “Limit” or “Offset”
•
in Fixed value operation mode according to the entered set-point temperature value
• in Program mode according to the highest temperature value of the selected temperature
program
Set the safety controller set-point by approx. 2 °C to 5 °C above the desired temperature set-
point.
14.3 Temperature safety device class 3.3 (option)
With the option over/under temperature protective device (temperature safety device class 3.3 acc. to DIN
12880) the unit is equipped with two additional safety devices (class 3.1 and class 3.2). The combination
of the safety devices is regarded as a safety device class 3.3.
The temperature safety device, class 3.3, serves to protect the cooling incubator, its environment and the
contents from exceeding the maximum permissible temperature. Please observe the guideline BGI/GUV-I
850-0 on safe working in laboratories (formerly BGR/GUV-R 120 or ZH 1/119 laboratory guidelines issued
by the employers’ liability insurance association) (for Germany).
With safety device
class 3.1 a maximum value for the temperature is set that the unit will not exceed due
to the regulatory function of the safety device class 3.1. This protection against excessively high
temperatures can, for example, serve to protect the cooling incubator, its environment and the material
under treatment from excess temperatures.
With safety device
class 3.2 a minimum value for the temperature is set that the unit will not fall below
due to the regulatory function of the safety device class 3.2. This protection against excessively low
temperatures can, for example, serve to protect sensitive loads from under cooling.
The combination of the safety devices class 3.1 and class 3.2 is regarded as a safety device class 3.3.
The safety devices class 3.3 are functionally and electrically independent of the temperature control
system. If an error occurs, they perform a regulatory function.
red alarm lamp
Figure 13: Temperature safety device class 3.1 or class 3.2