Fisher 244EH, 244ER manual Implementation, Transmitter Behavior with Intermittent Sensor Detect ON

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Implementation

Implementation

Figure 3-4. Open Sensor Response (Three Cases)

Transmitter Behavior with Intermittent Sensor Detect ON

When the Intermittent Sensor Detect feature is switched ON, the transmitter can eliminate the output pulse caused by intermittent open sensor conditions. Process temperature changes (ΔT) within 2% of the output range will be tracked normally by the transmitter’s output. A ΔT greater than 2% of the output range will activate the intermittent sensor algorithm. True open sensor conditions will cause the transmitter to go into alarm.

Transmitter Behavior with Intermittent Sensor Detect OFF

When the Intermittent Sensor Detect feature is switched OFF, the transmitter tracks all process temperature changes, even if they are the consequence of an intermittent sensor. The output delay due to the intermittent sensor algorithm will be eliminated.

The Intermittent Sensor Detect feature can be turned ON or OFF using a Model 244E transmitter with software version 5.4.1 or earlier with the Model 244EC software configuration tool when the transmitter is connected to the Model 244EC Configurator.

Turning the Intermittent Sensor Detect feature OFF does not affect the time needed for the transmitter to output the correct alarm signal after detecting a true open sensor condition. However, the transmitter may briefly output a false temperature reading for less than 0.5 seconds in either direction (see Figure 3-4)up to100% of output range.

(mA)	25
(mA)	20											High Alarm
Output	20

	15						Normal open sensor responses
Transmitter	15

	10							A false temperature output in
								either direction up to the
								threshold value (100 % of output
	5							range if Intermittent Sensor Detect
								is OFF) is possible when an open
								sensor condition is detected.												03
	0																			03
	0																			644
	0		0.2		0.4	0.6		0.8			1.0		1.2		1.4			1.6		644
							Time (seconds)													644-

Unless rapid response rate is necessary, the suggested setting of the Intermittent Sensor Detect mechanism is ON.

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Contents Models 244EH and 244ER PC-Programmable Temperature Transmitters 00809-0100-4737 English Rev. EAPage 00809-0100-4737 Rev EA 10/00 Product ManualModels 244EH and 244ER PC-Programmable Temperature Transmitters ¢00809-0100-4737f¤Page Troubleshooting Table of ContentsInstallation Maintenance andApprovals APPENDIX AReference Data APPENDIX B1 Introduction SAFETY MESSAGESSection MANUAL OVERVIEW Electrical CONSIDERATIONSGeneral MechanicalPage SAFETY MESSAGES Warnings 2 InstallationFigure 2-1. Transmitter Installation Flowchart TOOLS NEEDED FOR INSTALLATIONThe tools needed for installation are as follows Example MOUNTINGMounting a Model 244EH to a DIN Rail Special Mounting ConsiderationsHead Mount Transmitter with DIN Plate Style Sensor INSTALLATION PROCEDURESTransmitter Head Mount Transmitter with Threaded Sensor Figure 2-6. Typical Model 244EH Transmitter Mounting ConfigurationUsing Threaded Style Sensor and Assembly6. Run sensor lead wires from the sensor assembly to the transmitter Figure 2-7. Typical Rail Mount Transmitter Mounting ConfigurationUsing Integral Mount Sensor and Assembly To complete the assembly, follow the procedure described below644-0000A04B Rail Mount Transmitter with Threaded SensorSystem Requirements Configuration SoftwareMultichannel Installations Procedure for Windows 95 or Windows NT Choose the procedure that matches the operating system you are usingProcedure for Windows 3.1 or Windows for Workgroups Screen Conventions Model 244EC Configuration InterfaceSetting Up the Model 244EC Configuration Interface Figure 2-10. Complete Transmitter Configuration System FIELD WIRINGRTD or Ohm Inputs Sensor ConnectionsTotal cable length = 150 m Sensor Lead Wire Resistance Effect RTD InputExamples of Approximate Lead Wire Resistance Effect Calculations GivenThermocouple or Millivolt Inputs Figure 2-13. Transmitter Power, Sensor, and Configuration Terminals FAILURE MODE Changing Switch Positions3 Operation POWER SUPPLY Surges/TransientsGrounding CONFIGURATIONConfiguration Window Configuring a Single TransmitterFigure 3-1. Models 244EH and 244ER Configuration Software Main Configuring Several Transmitters Identically Figure 3-2. Viewing the Process Variable with the 244EC Viewing the Process VariableINTERMITTENT SENSOR ALGORITHM Threshold Value2% of Output Range Case ExamplesCase 1 Open Sensor Case 2 Temperature Change Greater than theCase 3 Temperature Change Within the Threshold Value 2 % of Range Intermittent Sensor Algorithm and Dampingcontinues to approach the input curveaccordingto theequation above Intermittent Sensor Detect Advanced Feature2.0 seconds, the transmitter outputs the reading that corresponds to the damping curve at that time , and continues to calculate andTransmitter Behavior with Intermittent Sensor Detect OFF ImplementationTransmitter Behavior with Intermittent Sensor Detect ON Page TROUBLESHOOTING Model 244EH software version 4 Maintenance and TroubleshootingSAFETY INFORMATION TABLE 4-1. Models 244EH and 244ER Troubleshooting ChartError Message Cause and Possible SolutionsPower Supply TRANSMITTER SPECIFICATION FunctionalAppendix A Reference DataCE Electromagnetic Compatibility Compliance Testing PerformanceUpdate Time Power Supply EffectInput AccuracyTABLE A-2. Model 244E Input Options and Accuracy SensorAmbient Temperature Effect Transmitters can be installed in locations where the ambientMaterials of Construction PhysicalWeight Electrical ConnectionsHead ORDERING INFORMATIONModel Product DescriptionPart Description TABLE A-5. Model 244EC Configuration Interface Ordering InformationTABLE A-6. Transmitter Accessories Typical Model Number 244ECTagging Standard ConfigurationCustom Configuration Unless specified, transmitter will be shipped as followsModel 244ER DIMENSIONAL DRAWINGS TransmitterEnclosure and Model 244EC Configuration Interface Configuration InterfacePage B Approvals HAZARDOUS LOCATIONS INSTALLATIONSCanadian Standards Association CSA Approvals LOCATIONS CERTIFICATIONSFactory Mutual FM Approvals Special Conditions for Safe Use Standard Australia Quality Assurance Service SAAKEMA Approvals Gostandart INSTALLATION DRAWINGSInstallation Drawing Rev. AB Figure B-1. Canadian Standards Association CSA Intrinsic SafetyFigure B-2. Canadian Standards Association CSA Explosion-Proof Installation Drawing Rev. AA00644-0009, Rev. AA Figure B-3. Factory Mutual FM Intrinsic Safety Installation Drawing00644-1049, Rev. AB Figure B-4. Factory Mutual FM Explosion-Proof Installation DrawingC Models 644 and 244E Temperature Transmitters Manual Supplement Models 644H and 244EH Transmitter Design Sensor Wiring Diagrams Special MountingOLD TRANSMITTER ConsiderationsUse with an Existing DIN Plate Style Sensor NEW TRANSMITTERConsiderations HART Communicator Model 644H only 2. Select 1 Off-line, 1 New Configuration, Rosemount, 644 TempEntity Parameters SPECIFICATIONSBASEFFA1 Intrinsically Safe Installation Entity Parameters Factory Mutual3Index Wiring Page Product documentation available at