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Guardian 5000 Series
HEATING OPERATING TIPS
Overshoot:
The unit may overshoot the temperature up to 10°C before stabilizing at the setpoint. The three methods to
minimize overshoot are:
1.
Metal containers minimize overshoot.
CAUTION! When heating metal containers on a ceramic top plate, it is recommended to use the lowest
temperature setting possible to limit thermal stress to the ceramic top plate.
2.
If a glass vessel is used, anticipate overshoot. Start with a temperature setpoint 5 to 10°C below the desired
temperature. When the temperature stabilizes at this lower setting, increase the heater to the final
temperature. Overshoot is then reduced to about 1°C.
The temperature display on the unit represents the estimated top plate temperature, not the sample temperature.
When external probe is in use, the temperature display on the unit represents the sample temperature.The vessel
contents being heated may be at a lower temperature depending on the size and thermal conductivity of the vessel.
It may be beneficial to monitor the temperature of the vessel contents and adjust the setpoint temperature
accordingly. If you need precise control, use the Ohaus External Temperature Probe.
Typical Time to Boil Water
The chart below is an example of an approximate time to boil for the specified amount of water in a specific vessel.
These values are only approximate and can vary from unit to unit. Values are based on 23°C water in an ambient
environment of 23°C.
Unit Size
Round Top
7×7
10×10
Heater Temp. Limit
380°C
500°C
500°C
Volume of Water
1L in 2L Beaker
1L in 2L Beaker
1L in 2L Beaker
EN-19
Typical Time to Boil
≈ 24 min
≈ 21 min
≈ 25 min
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