Sanyo 550 Relative Humidity RH, Relative Humidity Determination, Relative Humidity Control

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3.3. RELATIVE HUMIDITY (RH)

Relative humidity is a measure of the ratio of the amount of water vapour present in an atmosphere to the amount of water vapour that atmosphere could hold, ie. Ihe humidity present relative to the humidity possible. The latter varies with temperature, hence RH measurements are related to their prevailing temperature. Air at 100% relative humidity is saturated and cannot absorb any more water. If air at 100% rh is heated, the amount of water the air can hold increases and therefore the %rh will drop unless more water is introduced. If air at 100% rh is cooled, water will be lost through condensation on to the cooling surface.

For each atmospheric RH/temperature relationship there is another relevant temperature, known as the dew point. Surfaces at or below this temperature chill the water vapour sufficiently to cause condensation.

3.3.1RELATIVE HUMIDITY DETERMINATION

Air with a relative humidity less than 100% flowing over a wet surface causes evaporation of water from that surface and causes a temperature drop at the surface. The actual drop in temperature compared with the temperature of a similar dry surface subjected to the same air flow can be used to measure and control relative humidity. The technique is known as "wet & dry bulb psychrometry" and the difference in temperature is referred to as the "wet bulb depression". Psychrometric tables give interrelated values for temperature, relative humidity and wet bulb depression.

In the cabinet, conditioned air flows over two resistance thermometer (RT) sensors, one dry and one kept permanently wet by a wick fed from a constant level water reservoir. The RT's are connected to the programmer. The relative humidity is determined from the psychrometric difference between the wet and dry RT's. The reference temperature for humidity control is compensated for the actual chamber temperature. Errors are corrected by actuating the vapour phase generator (vpg).

3.3.2RELATIVE HUMIDITY CONTROL

Relative humidity levels are maintained by balancing continuous, minimised, extraction of water by condensation with intermittent injection controlled by an electronic controller.

3.3.3RELATIVE HUMIDITY INCREASE

All cabinets are fitted with a vapour phase generator (VPG).

Vapour phase generation

Water vapour produced in the vpg is introduced into the treatment chamber and is absorbed by the air.

The vapour phase generator is provided humidification from 15% to 95% rh at 60°C to 50to95%at20°C.

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Contents Customer De Ronde Programming system Sanyo GallenkampEnvironmental Chamber Contents Part ONE the Cabinet Commissioning U.K. Customers only Health & Safety at WorkSanyo Gallenkamp service & maintenance facilities IntroductionCabinet Data Specification PhysicalFalse roof Exterior/finishInsulation ShelfCF1 Specification PerformanceOptional Facilities Digital Channel Cooling Auxiliary Format 550 Digital ChannelsDigital Channel Cooling Main System ChannelUser Programmable Channel Digital Channel 8 Voltage Free Terminal VFTPrinciple and Airflow DESCRIPTI0NRefrigeration unit control Temperature ControlHeating CoolingRelative Humidity Control Vapour phase generationRelative Humidity RH Relative Humidity DeterminationRelative Humidity Decrease Cabinets not requiring on-site commissioning InstallationAccessories & Spares PositioningInstrument compartment Drain Ambient TemperaturePower Supply Mains Interrupt BridgeEither Distilled Water SupplyWetwicks Test Load ProtectionVent 13. RS232 ConnectorSafety Thermostat Cable PortMains INDICATORS/PUSHBUTTONSReset Amber pushbutton Control Panel InstrumentationTo Shut Down the Cabinet Normal Sequence Cabinet and Program Start UPCabinet and Program Shut Down To Start the CabinetMonth Maintenance and CareMaintenance Schedule Weekly or between testsInspection and replacement of the wet wicks Maintenance MethodsInterior and exterior cleaning Cleaning of cabinet drainsDistilled water filter Check safety thermostatClean the refrigeration condenser LubricationAppendix 1 Part Numbers Operation InstallationMaintenance Appendix 2 REC/W Water SystemSystem draining Deioniser replacementPart 2 Format 550 Instructions ContentsFormat digital channels Introduction to FormatHow to use these instructions Menu system Getting startedFunction keys Using the on-line helpUsing the data entry windows Types of data entry field Status barPage General Operating Sequence Steady State Mode Condition settingCondition monitoring Resetting steady state setpointsEnding manual control Main Menu General Operating Sequence Entering a NEW ProgramGeneral Operating Sequence Running a Program Condition C %RH Status LoggingWriting a Program How to use Format programming sheetsEntering the data into the programmer Selecting digital channels when you know bestLoading and saving programs Log Running a programHolding a program Program Monitor WindowView program graph Program completionProgram deletion Log Introduction to Data LoggingStarting Data Logging Loading into Spreadsheets Stopping Data LoggingDisplaying Results Setting Alarms Introduction to AlarmsPage Host PC System Requirements C0MPUTER InterfacingIntroduction Computer InteractiveSetting UP OFF-LINE Chamber Intelligence InstallationInstalling the Security KEY Configuring the Host SoftwareSteady State Control Network Monitoring ModeMain Menu Printouts ProgramLogging Program Communications Frame Definition Computer interactive interfacing main protocolPhysical Layer Definition Serial Number Length HeaderPacket Count Data Block Compatibility with RS485 Multi-Controller ConfigurationData Block Length Serial NumberFunctional Layer Definition Controller Configuration RequestController Configuration Packet Flow SummaryStatus Request 129Page Open File for Reading Read Data Close FileWrite Block to File Open File for WritingSET/CHANGE Steady State Condition SET Controller to Remote Access ModeSET Controller to Local Access Mode Digital Channel Description ENABLE/DISABLE Guaranteed SoakENABLE/DISABLE Manual Hold CDR Cable connectionsComputer RS232 Format 550 socket Pin D type Support software Control Loops Appendix 1 Technical SpecificationOperating temperature Operator interface data entryData Logging AlarmsProgram Run Options Monitoring displaysTemp Hum LS Rep Digital Channels Ddhhmmss C Appendix 2 Program Looping and Nested LoopsLoop Instructions ExampleEvent statement time = event actual time total looping time Calculation for Succeeding EventsEffects on the Running Timebase Display Nested LoopsSeconds Example of Nested Loops Format Programming Sheet Appendix 3 Format 550 Programming SheetsLEU ORE Contact Information

550 specifications

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