Hach 900 manual Re-installing the Bottom Panel

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Section 5

4.Place the controller, face down, on a cloth-covered workbench to prevent scratching the front panel.

5.Inside the Center Section, remove the four screws that fasten the Controller.

6.Lift the Center Section off the controller.

7.Remove the 17 screws from around the perimeter of the controller back panel.

8.Carefully pull open the bottom panel and let the attached connectors swing out of the way.

9.If necessary for the repair being performed, unplug the appropriate connectors. Always note each connector location before unplugging anything. Re-installing a plug into the wrong connector can cause extensive damage.

Note: The front panel gasket has a light coating of grease to help assure a watertight seal. Do not contaminate the grease or gasket area with dirt or debris during servicing. Always replace the gasket if it is damaged or missing. Never reassemble the case without the gasket properly installed.

5.7 Re-installing the Bottom Panel

Note: Always follow the procedure below when re-installing the 900 bottom panel.

Improper panel installation may result in damage to the instrument.

1.Hand tighten each nut until it makes contact with the panel.

2.Tighten the nuts in sequence shown in Figure 9 to 5 in.-lb (0.56 N-m).

3.Repeat the tightening procedure in the same sequence to 10 in.-lb (1.13 N-m).

Figure 9 Tightening the Nuts on the Bottom Panel

1

10

2

11

9

 

 

3

17

 

 

12

 

 

 

4

8

16

13

5

7

15

6

14

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Re-installing the Bottom Panel

8544Maintenance.fm

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Contents Sigma 900 Composite Sampler Page Table of Contents Table of Contents Sample Volume Controller DimensionsPump/Controller Housing Sample Volume RepeatabilityPage Receptacle Caps Interface ConnectorsInstrument Description General InformationFront Panel Humidity IndicatorSection Keypad and DisplaySafety Information Safety InformationUse of Hazard Information Precautionary LabelsHazardous Locations Confined Space Entry PeligroDefinition of Confined Space Installation Selecting the Installation SiteUnpacking the Instrument Vinyl Intake Tubing Mounting the SamplerAttaching the Intake Line Teflon-Lined Polyethylene Intake LineSetting Up the Intake Line and Strainer Setting Up the Intake Line and StrainerInstalling the Full Bottle Shut-Off Choosing BottlesPower Connections Power ConnectionsAuxiliary Connection 12 V dc Connector Pin Assignments12 V dc Auxiliary Pin AssignmentsMA Input Contact ClosuresAuxiliary Connection 20 mA Interface and Pulse Duration Input Splitter InterfacePage Keypad and Key Functions Tips and Techniques for Programming the Instrument Tips and Techniques for Programming the InstrumentSetting the Time and Date Section Setting the Time and DateBottle Setup Mode 1035 AM 24OCT00Section Explanations of Program Messages Data Logging Manual ModeManually Operating the Sample Pump Mode Measurements Triggered by Liquid Levels or FlowMeasurements Triggered by Liquid Levels or Flow Section Programming the Sampler for Level Control Other Displayed MessagesExample How to Calculate Pulses/CountsSection Flow Proportional Operation Flow Proportional OperationTherefore, the value for Intv = Cnts is Calculate t You want to collect 32 samples over an 8-hour period Page Cleaning the Sampler Removing and Opening the ControllerRe-installing the Bottom Panel Re-installing the Bottom PanelCircuit Board Identification Section Internal Desiccant ModuleInternal Desiccant Module Motor/Gear Box Internal Case Humidity IndicatorMemory Battery Motor/Gear BoxRepair Service Ordering Information for the U.S.AContact Information for Europe Limitations Limited WarrantyLimitation of Remedies Page Description Part Number Parts and AccessoriesTray/Positioner Page Program Flow Chart Page Lead-Acid Gel Cell Batteries MaintenanceTemperature ChargingStorage Temperature Maximum Recommended Storage Time Lead-Acid Battery Storage RecommendationsNickel-Cadmium Battery Storage Recommendations Appendix BItem Number Description Exploded View 1Exploded View Drawings Appendix C Exploded View 2 Appendix C Exploded View 3 Part Description Appendix C Exploded View 4Part Appendix C Exploded View 5 Appendix C Exploded View 6 Item Number Description Part Number