Emerson IFT9701 Troubleshooting over range and sensor failure conditions, Slug flow

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Troubleshooting continued

If the transmitter indicates an over range or sensor failure condition, follow these steps:

1.Isolate the transmitter from devices that use transmitter outputs to control the flow loop.

2.Refer to Table 8-5 to diagnose the problem.

3.If troubleshooting fails to reveal why over range and/or sensor failure messages have appeared, phone Micro Motion Customer Service. Phone numbers are listed on the title page of this manual.

Table 8-5 Troubleshooting over range and sensor failure conditions

Digital multimeter

 

 

(DMM)

Cause(s)

Corrective action(s)

• Open or short from red to

• Faulty cable

brown at transmitter

• Faulty drive coil in sensor

• Open or short from red to

• Moisture in sensor case or junction box

brown at sensor

 

 

 

• Open or short from green to

• Faulty cable

white at transmitter

• Faulty left pickoff in sensor

• Open or short from green to

• Moisture in sensor case or junction box

white at sensor

 

If open or short at transmitter terminals, check cable

If open or short at sensor junction box, return sensor to factory

Replace conduit and/or conduit seals

Repair cable

• Open or short from blue to

• Faulty cable

 

gray at transmitter

• Faulty right pickoff in sensor

 

• Open or short from blue to

• Moisture in sensor case or junction box

 

gray at sensor

 

 

 

 

 

• No open circuits

• Transmitter cannot calculate offset of flow

• Ensure that the sensor is filled with fluid

• No short circuits

signal

• Eliminate noise, then rezero

 

 

• Completely shut off flow, then rezero

 

 

 

 

• Transmitter cannot calculate flow rate

• Eliminate pipe stress, vibration, or

 

 

mechanical noise

Inappropriate density factor

Density < 0.200 g/cc or > 2.000 g/cc, volume flow is being measured

Density > 2.000 g/cc, mass flow is being measured

Erratic process density has caused flow tubes to stop vibrating

Plugged flow tube

Transmitter cannot calculate density

Characterize density values for sensor

Monitor density

Bring density within sensor limit

Purge flow tubes

Eliminate pipe stress, vibration, or mechanical noise

• Open or short from yellow

• Temperature outside sensor limit

to orange at transmitter

• Faulty cable

• Open or short from yellow

• Faulty lead length compensator

to orange at sensor

 

 

 

• Open or short from violet to

• Faulty cable

yellow at transmitter

• Faulty RTD in sensor

• Open or short from violet to

 

yellow at sensor

 

Bring temperature within sensor limit

Monitor temperature

If open or short at transmitter terminals, check cable

If open or short at sensor junction box, return sensor to factory

8.7Slug flow

Programmed slug flow limits minimize inaccurate measurement caused by significant quantities (slugs) of gas during liquid flow measurement or slugs of liquid during gas flow measurement. Such conditions adversely affect sensor performance by causing erratic vibration of the flow tubes, which in turn causes the transmitter to produce inaccurate flow signals.

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Model IFT9701 Transmitter Instruction Manual

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Contents Micro Motion Page Micro Motion Page Contents Flowmeter Startup Index Page About this manual Safety Before You BeginDefinitions European installationsFlowmeter components Remotely mounted IFT9701 transmitter Page Getting Started Safety, reliability, accessibilityHazardous area Temperature, humidity, and vibration Orientation and mountingVisibility of tags Transmitters approved for Atex ZoneJumper settings Compartment tags and lockout deviceFault output levels SecurityRe-installing the circuit board compartment cover Remotely Mounting the Transmitter Installation dimensions for remote mounting Mounting the transmitter to a wall or other surface Connecting the transmitter to the sensor Cable typesTemperature ranges for jacket material Cable selection guidelinesGuidelines for conduit Wiring connections to sensorGuidelines for cable gland Cable connections to sensors Sensor terminal designationsSensor wiring compartment and sensor wiring terminals Power Supply and Output Wiring Wiring guidelinesConnect power supply wiring Power supply wiring terminalsWire guidelines for DC power supply Connect output wiringMilliamp output Milliamp output performanceTypical Hart network wiring Milliamp output connected to Bell 202 multidrop networkCommunication tools connected to milliamp output Hart Communicator connectionsPulse output Wiring to pulse counter with internal pull-up resistor Wiring to Series 3000 applications platform with I/O cable Page Flowmeter Startup Customer serviceStartup procedures ZeroingOperating mode Diagnostic LEDStartup mode InitializationZeroing procedure Flowmeter zeroingConfiguration, calibration, and characterization Diagnosing zero failureProcess measurement Page Configuration with a Hart Communicator Configuration overviewHart tag Configuration parametersMeasurement units Measurement units for mass and volume flow Mass flow unit Software label Volume flow unitFlow cutoff DampingFlow direction Effect of flow direction on outputs and totalizersRange values for milliamp output Pulse output scalingCalibration procedures Auto zeroFlow calibration procedure Diagnosing zeroing failureTotal Characterization Configuration with ProLink II Software Configuration window Device panel Configuration window Flow panel Process variable measurementMass flow unit Software label Volume flow unit Effect of flow direction on outputs and totalizers Output configuration Configuration window Analog Output panelConfiguration window Frequency panel Configuration with ProLink II Software Flow Calibration dialog box Diagnosing zeroing failure Totalizer Control window Characterization Configuration window Density panel Transmitter diagnostic tools TroubleshootingGeneral guidelines Optional LCD Fault outputsNormal conditions indicated by LED Power supply Conditions indicated by optional LCDPower supply connections WiringNormal resistance and voltage ranges for flowmeter circuits Over range and sensor failure conditionsTroubleshooting over range and sensor failure conditions Slug flowDigital diagnostic messages Transmitter failurePage Functional specifications Output signals Milliamp active IFT9701 SpecificationsPerformance specifications Pulse passivePower supply options 85 to 250 VAC Fault indicationOutput testing Current source Local display optional20 to 30 VDC Environmental limits Temperature OperatingProcess fluid vs. ambient temperature StorageVibration limits Humidity limitsDensity limits Environmental effects Ambient temperature effect on milliamp outputShipping weight Hazardous area classificationsPage Appendix B Hart Communicator Menu TreesHart Communicator Menu Trees Installing the Optional Display Appendix CInstalling the Optional Display New and unused equipment Return PolicyUsed equipment Page Index AtexHart Customer service Index Page 3100572