Test Performance & Procedures; Visual Inspection; Electrical Tests; Functional Tests - NuAire NU-5510 Operation And Maintenance Manual

4.0 Test Performance & Procedures
All equipment is thoroughly inspected at the NuAire Factory at the time of shipment. Quality control is
maintained by constant surveillance over the product, beginning at the receipt of purchased material and
concluding with a final inspection, which certifies the Incubator performance to the specifications. In all
instances where product quality cannot be easily assessed on the end item, the product is inspected during
sub-assembly fabrication. The following test procedures are conducted on each cabinet and a copy of the
test report is included with each unit.
4.1

Visual Inspection

4.1.1 Each Incubator is visually inspected to insure that the interior is clean and free from scratches,
nicks, and burrs and that all welds, both interior and exterior are ground and polished smooth.
4.1.2 Painted surfaces are inspected to be free of scratches, nicks, insufficient covering, and runs.
4.1.3 The doors open and close freely without binding of the hinges. The gasket seals the inner glass
door tightly. The glass door is free of scratches.
4.2

Electrical Tests

4.2.1 Electrical Leakage Test
All Incubators are required to have primary-circuit filtering to meet EMC (electromagnetic
compatibility) regulations. Electrical leakage may exceed 0.5 milliampere provided the leakage
current does not exceed 1.0 milliamperes.
4.2.2 Dielectric Voltage - Withstand
1770 volts (VDC ONLY) is applied between dead metal parts and the hot/neutral power source
lead with no electrical breakdown using an Associated Research Model 4045AI or 3560D for 115
VAC units. 2100 volts (VDC ONLY) is applied for 230 VAC units.
4.2.3 Grounding Continuity
The resistance between the green bonding conductor of the supply cord and any dead metal part of
the cabinet shall not exceed 0.10 ohms.
4.3

Functional Tests

These functional tests are performed on every unit after a 48-hour burn-in period.
4.3.1 Control Systems
All diagnostic functions are exercised to insure proper operation of control systems, components
and alarms.
4.3.2 CO Control
2
Each unit is calibrated to function at a 5% CO
independent instrument. Each unit is monitored during the 48-hour burn-in period and only
accepted with zero failures.
4.3.3 CO Recovery
2
Each unit is exercised for CO
opened for 1 minute to deplete the CO
+0.2% within a 4-minute period.
4.3.4 Temperature
Each unit is monitored for stable temperature control over the 48-hour burn-in period (37°C).
4.3.5 Humidity
Each unit is subjected to the highest achievable RH during the 48-hour burn-in period and any
condensation problems corrected. Door and perimeter duty cycles are set at 18% and 32%
respectively for this test. These are the default settings from the factory.
OM0135
level. The concentration is checked with an
2
recovery time at the end of the 48-hour burn in period. The door is
2
. After the door is closed, the unit shall recover to 5%
2
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