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policies regarding flash points, toxicity, and such issues must be considered.
You are responsible for reading the (material safety data sheets) and acting
accordingly.
8.2 Stirring
Stirring of the bath fluid is very important for stable temperature control. The
fluid must be mixed well for good temperature uniformity and fast controller
response. The stirrer is precisely adjusted for optimum performance.
8.3 Power
Power to the bath is provided by an AC mains supply. See Section 3.1, Specifi
-
cations, for power details. Refer to and read the CAUTION at the front of this
manual concerning brownout and over voltage protection. Power to the bath
passes through a filter to prevent switching spikes from being transmitted to
other equipment.
To turn on the bath switch the control panel power switch to the ON position.
The stirring motor will turn on, the LED display will begin to show the bath
temperature, and the heater will turn on or off until the bath temperature
reaches the programmed set-point. When powered on the control panel display
will briefly show a four digit number. This number indicates the number of
times power has been applied to the bath. Also briefly displayed is data which
indicates the controller hardware configuration. This data is used in some cir-
cumstances for diagnostic purposes.
8.4 Heater
The power to the bath heater is precisely controlled by the temperature control
-
ler to maintain a constant bath temperature. Power is controlled by periodically
switching the heater on for a certain amount of time using a solid-state relay.
The front panel LED heater mode shows the state of the heater. The indicator
glows red when the heater is on and is off when the heater is off. The indicator
will pulse constantly when the bath is maintaining a stable temperature.
8.5 Refrigeration
This bath uses a two-stage refrigeration system which requires special refriger
-
ants to enable it to reach low temperatures. This section describes some aspects
of the cooling system and provides important information regarding
refrigerants.
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8 General Operation