HP 11744195 manual System Maintenance

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Chart Environmental Chambers

System Maintenance

System Maintenance

Maintenance of this equipment should be done by a qualified technician. High voltage electrical systems, cryogenic plumbing, and mechanical systems all represent a potential for injury or death. The main power must be removed from the chamber, and the liquid nitrogen supply should be disconnected prior to servicing this equipment. It is a good practice to keep a maintenance log for the system. The log should contain the tasks that must be accomplished and when they were performed.

Chart Industries does offer a service contract in which we will send a technician out to do routine maintenance items. Different plans are available. If interested, please call 1-888- 877-3093 for details.

Maintenance Tasks to be Performed on a Daily Basis:

1.Check the high and low temperature settings of the air safety controller to insure that they are set to the appropriate settings for the product that is being tested. The high temperature set point (SP) should never be any higher than 200°C. The low temperature set point (AL-2) should never be set lower than -80°C.

2.Make sure that the LN2 supply is on and that there is sufficient LN2 to perform your test. The pressure of the LN2 should also be verified and maintained at less than 175 psig.

Maintenance Tasks to be Performed on a Monthly Basis:

1.The proper function of the safety control devices should be checked on a regular basis. Replace any items that may be damaged or worn. These would include the ON/OFF switch and door proximity switch.

2.Check the air safety circuit high temperature trip point by lowering the setting of the product safety (SP) below 30°C and programming the system set point to 45°C to verify that the safety circuit trips at the high temperature it was set for and heating is disabled. Check the product safety circuit low temperature trip point (AL-2) by raising the setting of the air safety (AL-2) above 0°C and programming the system set point to -15°C to verify that the product safety trips at the low temperature it was set for.

3.The electrical compartment should be kept clean and vacuumed if necessary.

4.The current draws of the major components (blower motor and heater) should be checked with an amp probe and recorded for future reference to determine if there is any irregularity. Extreme caution must be taken whenever working with high voltage components. Increased current draws may be an early sign of heater problems.

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Contents Chart INDUSTRIES, INC Isis Chamber USER’S Manual Overview ServiceSafety First Chart Environmental Chambers Overview Table of Contents List of Tables Safety Information Description of Safety Features M p e r a t u r e Specifications and Utility RequirementsFeatures Watlow Series 96 temperature controller System Installation Chart Environmental Chambers System Installation Chart Environmental Chambers System Installation Operation Chart Environmental Chambers Operation Entering Temperature Set Points Heating/Cooling Indicators System Maintenance Chart Environmental Chambers System Maintenance Replacement Parts Warranty