Device description – KROHNE OPTIMASS 6000 EN User Manual

Page 13

DEVICE DESCRIPTION

OPTIMASS 6000

www.krohne.com

07/2014 - 4001894003 - MA OPTIMASS 6000 R03 en

Thermal shock

Thermal shock occurs when there is a sudden and extreme change (shift) in process
temperature. To prevent thermal shock on this meter, the manufacturer recommends that you
avoid a temperature shift greater than 100°C / 212°F, at a maximum of 40% of the nominal flow
rate.

These limits will give a minimum calculated life span for the meter of 3500 cycles. Thermal
shocking below this temperature will increase the life span of the meter. For more information,
please contact your nearest representative.

Maximum temperature rate rise

If the change in temperature (rate rise) is greater than 100°C / 212°F, the temperature rise must
be over a period of time. Calculate the time required for the whole temperature rise using the
table below.

These limits will provide a minimum calculated life span for the meter of 2000 cycles.
Temperature rises below 100°C / 212°F, or temperature rises over a longer period of time, will
increase the life span of the meter.

Meter size

Temp. rate rise

Example

DN 08...50

6°C / 10.8°F per minute

20°C...230°C / 68°F...446°F = 35
minutes
20°C...400°C / 68°F...752°F = 80
minutes

DN 80...100

3°C / 5.4°F per minute

20°C...230°C / 68°F...446°F = 70
minutes
20°C...400°C / 68°F...752°F = 140
minutes

CAUTION!
Operation outside these limits may result in shifts in density and mass flow calibration. Repeated
shocking and / or rapid heating, may also result in premature failure of the meter. However,
higher thermal shocks and / or an increased number of cycles are possible at lower working
pressures. For more information, please contact your nearest representative.

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