Hach 900 manual Motor/Gear Box, Internal Case Humidity Indicator, Memory Battery

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Section 5

1.

Desiccant module slides under circuit board

6.

J5

Distributor/Full Bottle Shut-off

 

 

 

 

 

 

2.

J8

LCD Display

7.

J2

12 V dc

 

 

 

 

 

 

3.

J6

Auxiliary

8.

J3

Fuse

 

 

 

 

 

 

4.

J1

Liquid Sensor

9.

J4

Motor

 

 

 

 

 

5.

Lithium Memory Battery

10.

J9

Keypad

 

 

 

 

 

 

5.10 Motor/Gear Box

The motor/gear box requires no regular maintenance. The special formulation gears are self lubricating and require no oil or grease.

5.11 Internal Case Humidity Indicator

After replacing the desiccant module and re-sealing the case, the Internal Case Humidity indicator disc (Cat. No. 2660) should return to its original blue color. Replace the indicator disc if it fails to return to blue after replacing the desiccant module. To replace the indicator disc, remove the bottom panel that is held in place by a small clip and screw.

5.12 Internal Case Humidity Indicator

The humidity indicator is located on the left front side of the controller. If the humidity indicator is blue, the desiccant is dry. If the indicator turns pink or white, inspect the electronics housing for seal failure and replace the desiccant module.

5.13 Memory Battery

Random Access Memory (RAM) is a very reliable data storage medium for microprocessor applications. However, RAM requires power at all times. If power is removed, the data stored in the RAM chip is lost. Therefore, you cannot power the RAM chips from the 900 Composite Sampler power supply because you would lose data and program settings every time you unplugged the power cord. A separate battery located inside the sampler controller is provided to power the RAM chips and the real-time clock. The memory battery keeps the program entries and logged sample data alive inside the RAM memory when the main power fails or is removed for transport or replacement.

The 900 Composite Sampler memory battery consists of a 1.5 V dc Lithium cell. The battery is soldered to the main circuit board.

Should the memory battery voltage fall too low to properly maintain the program settings, a warning: MEMORY POWER LOW will alert you to replace the battery. The 900 Composite Sampler utilizes a very small amount of energy from the memory battery during normal operation. The service life of the batteries in this application is typically five years.

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Motor/Gear Box

8544Maintenance.fm

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Contents Sigma 900 Composite Sampler Page Table of Contents Table of Contents Controller Dimensions Pump/Controller HousingSample Volume Sample Volume RepeatabilityPage Interface Connectors Instrument DescriptionReceptacle Caps General InformationHumidity Indicator SectionFront Panel Keypad and DisplaySafety Information Safety InformationPrecautionary Labels Use of Hazard InformationHazardous Locations Confined Space Entry PeligroDefinition of Confined Space Selecting the Installation Site InstallationUnpacking the Instrument Mounting the Sampler Attaching the Intake LineVinyl Intake Tubing Teflon-Lined Polyethylene Intake LineSetting Up the Intake Line and Strainer Installing the Full Bottle Shut-OffSetting Up the Intake Line and Strainer Choosing BottlesPower Connections Power Connections12 V dc Connector Pin Assignments 12 V dcAuxiliary Connection Auxiliary Pin AssignmentsContact Closures MA InputAuxiliary 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 InstrumentSection Setting the Time and Date Bottle Setup ModeSetting the Time and Date 1035 AM 24OCT00Section Explanations of Program Messages Manual Mode Data LoggingManually Operating the Sample Pump Measurements Triggered by Liquid Levels or Flow ModeMeasurements Triggered by Liquid Levels or Flow Section Programming the Sampler for Level Control Other Displayed MessagesHow to Calculate Pulses/Counts Section Flow Proportional OperationExample 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 PanelSection Internal Desiccant Module Circuit Board IdentificationInternal Desiccant Module Internal Case Humidity Indicator Memory BatteryMotor/Gear Box Motor/Gear BoxRepair Service Ordering Information for the U.S.AContact Information for Europe Limited Warranty LimitationsLimitation of Remedies Page Parts and Accessories Description Part NumberTray/Positioner Page Program Flow Chart Page Maintenance TemperatureLead-Acid Gel Cell Batteries ChargingLead-Acid Battery Storage Recommendations Nickel-Cadmium Battery Storage RecommendationsStorage Temperature Maximum Recommended Storage Time Appendix BExploded View 1 Item Number DescriptionExploded View Drawings Appendix C Exploded View 2 Appendix C Exploded View 3 Appendix C Exploded View 4 Part DescriptionPart Appendix C Exploded View 5 Appendix C Exploded View 6 Item Number Description Part Number
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