Micro-Bath
Power
7
5. Power on the Product. Toggle the switch on the power entry module (PEM), see Figure 2. The fan
blows air through the Product and the display illuminates after 3 seconds. After a brief self test, the
Product begins normal operation. If the Product fails to operate, check the power connection.
6. Heat to the maximum temperature of the fluid. See Set the Temperature.
7. Slowly fill the well to 2.5 cm (1 in) below the top of the basket at the maximum temperature of the
fluid.
WCaution
Be aware that some fluids expand and could overflow the bath if not watched, see Bath
Fluid and its subsections for more information.
The set-point temperature and the number of and size of the probes determine the fluid level. Under-
filling can reduce bath performance. Always keep the fluid level at least 2 cm (0.75 in) below the top
of the well to prevent overflow of the fluid when you insert the probes. For example, if you place
silicone oil 200.05 at room temperature, 25 °C (77 °F), into the bath and heat to 125 °C, this causes
a 2.5 cm (1 in) expansion of the fluid inside the well.
The display shows the well temperature. The well Thermal Electric Devices (TEDs) bring the
temperature of the well to the setpoint temperature. Make sure that the fluid is being stirred.
Power
The ac mains supply provides power to the bath and passes through a filter to prevent the transmission
of switching spikes to other equipment. Refer to Specifications for power details.
When powered on, the display briefly shows a four-digit number. This number indicates the number of
times power was applied to the bath. Also, briefly displayed, is data which indicates the controller
hardware configuration. Use this data in some circumstances for diagnostic purposes.
Thermal Electric Devices
The temperature controller precisely controls the bath power to maintain a constant bath temperature.
Power is controlled by periodically switching the TEDs on for a certain amount of time with power
transistors.
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