Varec 4532 manual Temperature Adjustment VH70 ~ VH79, VH69 Ref Voltage, VH71 Zero Adjust

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Operation and Description of Instrument Function	Average Temperature/Water Bottom Sensor and Converter

VH69 Ref Voltage

Item type: read and write

Default: 200

Range: 0 ~ 255

This parameter is the setpoint for the 4532 ATC power supply failure alarm. The

4532 ATC operates with a minimum 16 VDC supply voltage via the multi-drop HART loop under normal operating conditions. The 4532 ATC transmits an error message when the supply voltage drops below 16 VDC. The default value of 200 is equivalent to

16VDC.

8.1.8Temperature Adjustment: VH70 ~ VH79

VH70 Element Select Item type: select Range: 0 ~ 19

Allows selection of individual temperature elements for adjustment (0 = #1 element,

5= #6 element, 19 = reference 100 Ohm resistor). Detailed values and parameters of the selected element can be shown in:

•VH71 "Zero Adjust"

•VH73 "Temperature X"

•VH74 "Position X"

•VH75 "Resistance X"

•VH76 "Resistance Adj"

VH71 Zero Adjust

Item type: read and write

Default: 0

Range: -1000.0 ~ 1000.0

Zero adjustment of the individual element selected at VH70. This value can be adjusted when the measured temperature of the selected element has a minor offset value as compared to a precision reference thermometer.

For example: Selected element #2 indicates 25.4 °C. The reference thermometer indicates 25.2 °C. Enter "-0.2" in VH71. Element #2 now has a constant offset applied to the raw measurement.

VH72 Adjust Span

Item type: read and write

Default: 1

Range: 0.8 ~ 1.2

This span adjustment applies to all installed temperature elements. This parameter is multiplied by the raw measurement for each individual element to calculate the calculated temperature for each individual element.

Note! All of displayed individual temperature values are calculated based on the following formula.

38	Installation and Operations Manual

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Contents Installation Page Copyright Disclaimer of Warranties Safety Precaution Definitions Safety Precautions Average Temperature/Water Bottom Sensor and Converter Contents Operation and Description of Instrument Function Index Varec, Inc Contents Installation and operation overview IntroductionIntroduction Software historySystem functional diagram HartSafety instructions Power supply WiringGrounding ReturnDirect voltage Safety instructions Identification Device designation NameplateScope of delivery CE marks, declaration of conformity Installation Design, dimensionsRecommended procedure Incorrect procedure Flexible tube UnpackingInstallation Instructions Special conditions for safe useInstallation Mounting Mounting instructionMounting on a fixed roof tank Top anchor methodTensioning wire mounting Thermo well method Thermo well applicationAnchor weight method Flexible tube is stabilized by an anchor weightAnchor weight mounting Mounting on a floating roof tank Thermo well method Guide ring and anchor weight method 10Guide ring and anchor weight applicationMounting Wiring Terminal Connection 1 4532 ATC terminal2 6000 Series Servo Tank Gauge terminal 3 4590 TSM i.s. terminal4532 ATC Grounding Wiring Device set up 4590 TSM OperatingLocal Hart connection As a Varec tank gauging instrument As a standalone generic Hart instrument4532 ATC specific parameter set up on the 4590 TSM Device set up 6000 Series Servo Tank Gauge2 4532 ATC configuration on 6000 Series Servo Tank Gauge Preparation of 6000 Series Servo Tank GaugeGVH480 Diagnostic GVH447 Reference ZeroGVH449 Reference GVH450~459 Temp No.1~10Operating Temperature measurement Primary values VH00 ~ VH09 Operation and Description of Instrument FunctionHart Device designation Device DataElement Temperature 1 VH10 ~ VH15 Element Temperature 2 VH20 ~ VH29Advanced Spot VH28 Lower LimitVH46 Hysteresis Width Item type read and write Default 10mm VH29 Upper LimitVH48 Gas Offset VH49 Liquid OffsetWB Adjustment and Operation Power VH60 ~ VH69 VH53 Element Point Item type select DefaultVH55 Element Volume Item type read and write Range 1 ~ WB primary and Advanced temp VH50 ~ VH59Temperature Adjustment VH70 ~ VH79 VH71 Zero AdjustVH72 Adjust Span VH69 Ref VoltageVH73 Temperature VH74 PositionVH75 Resistance VH76 Resistance AdjVH79 Protect Code VH80 Present Error Error codeVH81 Temperature Unit VH82 Element Number VH83 No. of PreamblesVH84 Distance Unit VH85 Kind of IntervalDevice setting 2 VH90~VH99 VH88 Short ErrorVH89 Open Error VH90 Device ID Number Item type read and write DefaultVH92 Error Dis. Sel VH94 Polling AddressVH95 Manufacture ID VH96 Software VersionMaintenance Exterior cleaningRepairs Repairs to Ex-approved devicesReplacement GVHTroubleshooting System error messagesSpare parts 1Spare PartsAccessories Anchor weight Tall profileAnchor weight Low profile Wire hook, Top anchor 3Wire hook dimensionTechnical data Technical data at a glanceTechnical data Order Structure Process connection SUS304Order Structure Declaration of Contamination Declaration of Contamination FormDeclaration of Contamination Form Index Index 4532 Your official representative Your offical representative