68 | Maintenance
Controlled Rate Freezer
7. Connect the Sample probe to the connector.
8. All chamber parts must be re-installed for consistent
uniformity and airflow. Connect the unit to the power
source and turn it on.
9. The freezer is ready to be returned to service.
Clean the Cabinet Exterior
Clean the freezer exterior with a damp sponge or soft, well-
wrung cloth and mild detergent dissolved in water. Dry with a
soft cloth.
Solenoid Valve
Maintenance
Operation
Normally closed: Valve is closed when solenoid is
de-energized, valve is open when solenoid is energized.
Cleaning
A periodic cleaning of all solenoid valves is recommended.
The time between cleanings will vary, depending upon media
and service conditions. Generally, if the voltage to the coil is
correct, sluggish valve operation, excessive noise, or leakage
will indicate that cleaning is required.
The unit will track the valve cycle counts for each valve and
will notify the user when a valve is approaching end of life.
When a profile run completes and a valve is past the end of
life recommended cycle count, a dialog will be displayed on
the UI screen.
Reset Heater Over temp
Thermostat
The thermostat will disable heater operation if the sidecar
temperature exceeds 92°C. If this occurs, a service technician
will be required to reset the thermostat to resume normal
operation.
Preventive Maintenance
Your equipment has been thoroughly tested and calibrated
before shipment. Regular preventive maintenance is
important to keep your unit functioning properly. The operator
should perform routine cleaning and maintenance on a
regular basis. For maximum performance and efficiency, it is
recommended that the unit be checked and calibrated
periodically by a qualified service technician.
We have qualified service technicians, using NIST traceable
instruments, available in many areas. For more information on
Preventive Maintenance or Extended Warranties, contact
Technical Services.
The following is a condensed list of preventative maintenance
requirements. Refer to
Cleaning and calibration adjustment intervals are dependent
upon use, environmental conditions and accuracy required.
CAUTION:
Be sure all chamber components are
re-installed in the proper locations to avoid
compromising the chamber airflow and
temperature uniformity.
CAUTION:
Avoid damaging the chamber
opening gasket.
WARNING:
These procedures must be
performed by qualified service technicians.
WARNING:
Only qualified service personnel or
persons experienced in servicing and maintaining
laboratory equipment should perform this
procedure.
