MANUALP/4000_SERVICE_0712 July2012
23
VERIFYING CABINET PERFORMANCE
There are two basic tests that may be carried out to verify cabinet performance.
NB: These tests MUST be carried out with the cabinet EMPTY and at the
specified ambient of +20
o
C.
TEMPORAL PERFORMANCE:
The cabinet should be set to operate at the Contherm specified calibration
conditions.
Temporal performance is tested by placing a suitable (calibrated) test probe in
the centre of the workspace and recording the readings for up to 1 hour AFTER
the cabinet has FULLY STABILISED. The cabinet has fully stabilised when the
average temperature is no longer increasing or decreasing over time.
The result should be within the quoted specification. This result is a function of
the cabinet control system, sensor and airflow.
SPATIAL
PERFORMANCE:
The cabinet should be
set to operate at the
Contherm specified
calibration conditions.
Check Spatial Variation
@ 37
o
C
(Refer manual for
specification, 8 points
as per diagram)
Spatial performance is
tested by placing
suitable (calibrated) test
probes (usually
thermocouples) in the eight specified positions and recording the readings for up
to 1 hour AFTER the cabinet has FULLY STABILISED. The cabinet has fully
stabilised when the average temperature is no longer increasing or decreasing
over time.
The sensors must be no closer than 30mm to any wall or roof and must be
above the lowest shelf position by at least 30mm.
The spatial test must be performed with all doors, vents etc CLOSED and the
measuring sensors must be very closely matched at the specified temperature.
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