Omega RD260A instruction manual Temperature Compensation for Thermocouple Signal

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4.8 Maintenance

Power terminal

L

N

Three lead wires should have the same resistance values.

B A

1	b
1
2
3

Decade resistance box

Input terminals

(for RTD)

Temperature Signal as RTD for Pen model

(for Dot-printing model, the wire connection exchanges between the terminal B and b.)

Temperature Compensation for Thermocouple Signal

Copper wires Thermocouple wires or extension wires Power terminals

			L
+	+	+	N
+	+	+
—	Meter	Couple
	—	—

4. DAILY

DC voltage standard

Copper wires

	— +
	1
	2
Thermocouple wires	3

Ice pieces packed to maintain the temperature at 0ßC

OPERATION/MAINTENANCE

(reference junction compensator Model TRCIII)

Reference Junction Compensation for Thermocouple Input

A DC voltage generated by a thermocouple differs from a value calculated from the table of thermo- electromotive force (EMF) because the table is based on the 0˚C reference temperature but the temperature at the recorder input terminal is generally equal to the room temperature.

The recorder measures the temperature at the input terminal for compensation; when the input terminals are shorted (equivalent to 0˚C of the thermocouple in the EMF table), the recorder indicates the temperature at the input terminal.

For calibrating a recorder, an input voltage after the compensation (after subtraction of the compensating voltage) should be applied to the recorder; an example is shown in (thTRCIII reference junction compensator is used).

Reference Temperature Compensating Connection for Pen model (same as Dot-printing model)

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Contents User’s Guide Servicing North America Introduction Power Supply Alternative currentProtective Grounding Necessity of Protective GroundingDefects of Protective Grounding and Fuse FuseInstallation ChaptersContents Setting A/D Integration Time Pen model Before Installation Handling PrecautionsChecking Accessories and Appearance Accessories No. Name Qty RemarksChecking and Unpacking Spare Parts NameRemoving Packings Removing Lock Screw and Packings for TransitChecking Model Codes Checking Model CodesInstallation Site and Mounting Methods Installation SiteMounting Methods MountingExternal Dimensions Panel cutoutWiring Rear Panel Terminal ArrangementPen model Dot-printing modelPower Supply Wiring Power Supply WiringInput Signal Wiring Crimp-On LugsWiring for Input Terminals TC inputRTD input Terminal BoardAlarm Output Wiring option Contact characteristicsOutput type Output capacityRemote Control Wiring option Input characteristicsComponent Names and Functions Front Panel Power switch push-button typeKey panel push-key type Status Display Chart cassetteData Display Characters on the Display Maintenance Switching Power On/OffInstalling or Replacing Chart Paper Prepare a new chart Installing or Replacing Pens Pen model Simple replacementReplacement under pen-replacement mode Felt-tip penPlotter pen Installing or Replacing Ribbon Cassette Dot-printing model Feeding the Chart Getting the RecordingStarting/Stoping the Recording Printing SamplesGetting a Digital Printout Getting a List PrintoutGetting a SET UP List Printout Dot-printing model Printing SampleDisplay MAN except for the 1-pen model Selectting the DisplaySelecting a screen Periodic Maintenance MaintenanceIndication of Remaining Chart Length Battery Replacement Fuse ReplacementCleaning the Carriage Shafts Fuse ReplacementPen model CalibrationDot-printing model Calibration procedure DC Voltage Signal for Pen model same as Dot-printing modelRequired instruments for calibration Recommended instrumentsTemperature Compensation for Thermocouple Signal Reference Junction Compensation for Thermocouple InputPen-Position Adjustment Pen model Adjusting procedureDaily OPERATION/MAINTENANCE Dot-Position Adjustment Dot-printing model Figure aDaily OPERATION/MAINTENANCE Data Setting Guides Operation mode SET modeSET UP mode Turning the function offOperation Mode Disp keySET Mode SET UP Mode Password Procedures to Enter Setting Data SET Mode Setting Input Range and Recording Span Range Key operation Skip SettingIndication Description Voltage Measurement Setting Volt Setting Volt Input Ranges DisplayKey operation Indication Description TC Type Description and RTD Type DescriptionDigital Input Setting DI Setting Difference Computation Setting Delt Setting Scale Setting SCL Setting Indication DiscriptionKey operation Indication Discription Setting to Obtain Square Root Sqrt SettingENT key Explanation of Square Root Setting Offsets Offst Setting Alarms Alarm Is displayed and the setting is completed. Press Assigning Units Unit Setting Chart Speed Chart Chart Speed unit mm/hSetting Date/Time Clock FIX Auto Assigning Tags TAG Setting Messages MSG Means ‘SPACE’Setting Key-lock KEY SET UP Mode Setting Procedure Setting Alarm Hysteresis On/Off Setting A/D Integration Time Pen model Setting Upscale/Downscale TC Burnout Select Using the key. Press the ENT key Display AppearsConfiguring the Input Filter Pen Model Filter works as followsBuffer data for Setting for Moving Average Calculations Dot-printing modelNth sample +1th sample Turning Offset Settings Protection On/Off Assigning Different Colors to Channels Dot-printing model To select Display, and press the ENT key SelectSetting Pen Offset Compensation On/Off Pen model, /D1 option Recorder as Viewed from the SideTurning Alarm Printing On/Off Use Key to select the display Press the ENT keyPen Model Chart Speed Setting Periodic Printout On/OffDot-printing Model Chart Speed Turning Printing of Changes in Chart Speed On/Off Setting ProcedureSetting Procedure Selecting channel Number or Tag Changing the Temperature Unit /D2 option Select Using the key Press the ENT key. The display AppearsChanging Default Settings for Remote Operation option Turning the Settings Protection Function On/Off Initializing Settings Error Codes Error Code ListRecovery Self-diagnostic Message Printout Meanings Store SET UP Settings AgaiinTroubleshooting Recorder is completely inoperativeIs the input free of noise? Glitch is found other than the previously mentioned ploblems Warrant Y/ Disclaimer OMEGA…Of Course