PerkinElmer AAnalyst 700, User Manual

Page: 116 / 194

Laboratory Requirements
6 -16
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Cooling the spectrometer system
The graphite furnace uses water cooling to allow the graphite tube to return to its
equilibrium temperature (approximately ambient) quickly between
measurements (
see ‘Cooling the furnace’ in the Graphite Furnace User’s Guide ).
Cooling coils are also incorporated in the spectrometer’s power supply to
maintain the electronic components at a comfortable working temperature.
Cooling system
PerkinElmer offers a recirculating cooling system as an option. It provides
coolant at a constant temperature and flow rate, to allow the most reproducible
analytical conditions. It also makes the system independent of external water
supplies and saves water (
see ‘Cooling the furnace’ in the Graphite Furnace
User’s Guide ). This cooling system includes a pressure-sensitive safety device
that opens a bypass if the internal pressure in the circulatory system increases to
above a safe value.
Power requirements: 230 V; 50/60 Hz (electrical power is supplied by the
spectrometer)
Part Number: B019-8072
External cooling
If you intend to run the spectrometer system without the PerkinElmer cooling
system, you must connect another suitable source of cooling, such as the main
water supply or a laboratory thermostat. If you connect the spectrometer system
to the main water supply, make sure that the water pressure is as given in Table
6-3.
Table 6-3. Requirements for the Cooling Water Supply
Water quality sediment-free drinking water
Temperature 20–40 °C
Flow rate not less than 2 L/min
Pressure 2.5–3.5 bar (36–50 psig)
pH 6.5–7.5
Hardness not greater than 14 °dH or 100 ppm