Introduction
Chapter 1
OPERATION MANUAL
V1.2.0en/12.05.15//14.06
Liability for errors and misprints excluded.
Unistat® T300 Series
17
1.4
General information
1.4.1
Description of workstation
The workstation is located at the control panel in front of the temperature control unit. The work-
station is determined by the customer's connected peripheries. Accordingly, it must be designed
safe by the responsible body. The workstation design also depends on the applicable requirements
of the German occupational health and safety regulations [BetrSichV] and the risk analysis for the
workstation.
1.4.2
Safety devices to DIN 12876
The rating of your temperature control unit is stated on the data sheet in the appendix.
Rating
Temperature
control fluid
Technical requirements
Identification
d)
I
Non-combustible
a)
Overheat protection
c)
NFL
II
Combustible
b)
Adjustable overheat protection
FL
III
Combustible
b)
Adjustable overtemperature protection
and additional low level protection
FL
a)
Usually water; other fluids only if non-combustible even within the temperature range of an individual fault.
b)
The temperature control media must have a combustion point of ≥ 65 °C; i.e. if ethanol is used, only supervised
operation is possible.
c)
The overheat protection can, for instance, can be realized using a suitable fill level sensor or a suitable
temperature limiter.
d)
Optional at the choice of the manufacturer.
Combined electronic low level and overtemperature protection
This temperature control unit has been equipped with electronic overtemperature protection and
low level protection. Instead of a mechanical float switch, temperature sensors are employed on the
surface of the heating coils. These sensors monitor overtemperature at this potential ignition
source, thus ensuring that the controller regulates the heating coil temperatures regulates below
the critical temperature (combustion point of the thermal fluid). A message is displayed on the
>Touchscreen<
[88].
Mechanical tools are no longer required for setting the trip values for the overtemperature protec-
tion. A software tool is used instead. The threshold value for the overtemperature protection can be
set only if a code randomly generated by “Pilot ONE” beforehand is entered correctly. As with the
mechanical tool, accidental settings are thus prevented.The type of overtemperature protection
function and of low level protection depends on the temperature control unit.
Rating of laboratory
thermostats and
laboratory baths
Overview of the tem-
perature thresholds
