Preventive Maintenance And Diagnostics - Thermo Scientific 3403 Manual

Thermo Scientific
Preventive Maintenance and
Section 5
Diagnostics
Preventive maintenance is the best way to ensure that the unit you own or
service continues to operate at its optimum level. The following
instructions will assist in your preventive maintenance program.
• Cabinet leveling - Check the cabinet to ensure that it is level. Check
from the front to the back and then side to side, check the level on a (6)
month schedule.
• Cabinet clearance - Locate the unit in a level area free from vibration
with a minimum of three inches (7.6 cm) of space on the sides and rear
and 12 inches (30.5 cm) at the top. The table must be able to support
40 PSI. Also, allow enough clearance so that the door can swing open at
least 90°, and so that the power cord can easily be reached to disconnect
power.
• Voltage requirements - Check the voltage requirements every three to six
months. Verify that the source voltage is within +10% and -5% of the
rated data plate voltage.
• Gasket maintenance - Periodically check the gaskets around the door for
punctures or tears. Gasket leaks are indicated by an excessive gas con-
sumption and/or condensation.
Keep the gaskets clean by wiping gently with a soft cloth.
To check gaskets for proper sealing, ensure that the cabinet is level. Then
use a 2" x 6" piece of paper closed between the gasket and the door at 2"
intervals around the perimeter. At each position, pull on the free end of
the paper; a slight resistance should be felt. While performing this test,
inspect the gasket for cuts or tears. An improperly sealing gasket must be
replaced.
• Center Air Temperature Validation - Check the center air temperature
using a thermocouple located physically in the geometric center of the
cabinet (centered from top-to-bottom, and centered from left-to-right)
versus the control panel electronic display. The temperature should
match the display within ±0.1°C.
• Electrical wires - Check the electrical control box for any burnt or discol-
ored wires due to lose connections or low voltage conditions.
1. Maintenance should only be performed by trained personnel.
Midi 40 CO2 Incubator 5-1