Inst ToolsInst ToolsInst Tools
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Search
  • Books
  • Software
  • Projects
  • Process
  • Tools
  • Basics
  • Formula
  • Power Plant
  • Root Cause Analysis
  • Electrical Basics
  • Animation
  • Standards
  • 4-20 mA Course
  • Siemens PLC Course
Reading: Troubleshooting DP type Transmitter Common Problems
Share
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • Design
  • PLC
  • Interview
  • Control System
Search
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Flow Measurement > Troubleshooting DP type Transmitter Common Problems

Troubleshooting DP type Transmitter Common Problems

This article covers the troubleshooting guidelines if you are facing practical common problems with a DP type transmitter.

Last updated: February 21, 2023 3:01 pm
Editorial Staff
Flow Measurement
No Comments
Share
5 Min Read
SHARE

This article covers the troubleshooting guidelines if you are facing practical common problems with a DP type transmitter. The DP transmitter can be used as a differential pressure transmitter, flow transmitter, or even as a level transmitter.

DP Transmitter Common Problems

DP type Flow Transmitter Preventive Maintenance

Let us see the troubleshooting guidelines for a DP-type transmitter.

Follow the below-mentioned steps:

  1. Check whether the DP-type transmitter is in power ON condition in the field or not. If the transmitter is in power-off condition, then check the cable connections. Trace the loop from the transmitter to the marshalling cabinet via the back tracing method.
  2. Check the barrier or isolator which is installed in the marshalling cabinet. If there is an issue with the barrier then replace it. If cable connections and barriers are found ok, then check the cable healthiness. Replace the cable pair with a spare cable if found unhealthy.
  3. If there is a reading mismatch between the field value and the PLC/DCS system, then verify the configured DP transmitter range in the field as well as in the system logic. Correct wherever found incorrect. Reference for the correct range should be taken from the transmitter datasheet or any other approved document.
  4. Check the impulse tube leakage for all tubing connections. If found leakage, then arrest the leak. Use a snoop liquid leak detector (or any other leak detector) for detecting the leakage.
  5. Now check the isolation valves which connect the transmitter to the process. If found in an isolated condition, then open the isolation valve. But before opening the isolation valve, verify the tube fittings and condition of the tube also.
  6. Check the condition of the manifold. The equalization valve should be in close condition. The isolation valves should be open and the vent valves should be in close condition. The vent plugs should be properly fixed.
  7. If the DP transmitter is wet leg type, then refill the wet leg with the appropriate fluid. Take necessary approvals for filling the wet leg.
  8. If one leg of DP type transmitter is at atmospheric reference, then check the condition of the leg. A bug arrester should be present on the leg at atmospheric reference.
  9. Check whether the transmitter leg open to the atmosphere is clear or not. The facing direction of the leg which is open to the atmosphere should be faced towards the ground. The Rainwater may go into the leg if it is facing towards the sky and it will disturb the measurement readings.
  10. If still the transmitter is not responding, then do flushing activity. Back-flushing in case of hazardous fluids and forward flushing in case of air and water is needed.
  11. For back flushing, pressurized fluid compatible with the process fluid will be needed. To develop pressure, a hand pump can be used. While using a hand pump, make sure to not-to increase the pressure above the impulse tube’s rated pressure. Flushing activity will remove the choked material inside the tubes and at the main tapping point.
  12. Verify whether the HP tapping of the transmitter is connected to the HP side of the primary pressure sensing element and the LP side is connected to the LP side of the pressure sensing element. If found incorrect, then correct by isolating the transmitter by using the isolation valves.
  13. After flushing, take the transmitter again in line and check the whole system again with a snoop solution or any other standard leak-detecting solution.
  14. Check the device configuration data such as LRV, URV, and mA range using a HART communicator. Use the transmitter datasheet for confirming the configured data.
  15. If still, the transmitter is not responding properly, check the response of the transmitter using a hand pump/Scandura depending upon the span range. 
  16. Check the condition of the primary pressure sensing element i.e. orifice, venturi, pitot tube, or other primary sensing elements. For this purpose isolation of the line is necessary.
  17. Perform calibration of the DP type pressure transmitter using the calibrating device, the device’s response will be found ok.

Read Next:

  • Orifice Meter Specifications
  • Transmitter Calibration Frequency
  • Instrumentation and Control Quiz
  • Orifice Drain and Vent Hole
  • Facts about Orifice Plates
Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address
You've successfully subscribed !

Continue Reading

How does an Orifice Measures Flow?
What is a Velocity-based Flow Meter?
Coriolis Flow Meter Construction
Volumetric Flow Calculations
What are the Orifice Plate Flow Requirements?
Dall Tube Flow Meter – Principle, Advantages, Disadvantages
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
Leave a Comment

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
210kSubscribersSubscribe
38kFollowersFollow

Categories

Explore More

What is a Coriolis Flow Meter?
Orifice Flowmeter Rangeability
What is the Purpose of Orifice Plate Drain Hole and Vent Hole?
Types of Flow Meters
Flow Instruments – Selection, Principle & Application
Piston Flow Meters Working Principle with Animation
Basics of Flow Measurement
Classification of Flow Measurement Techniques

Keep Learning

Vortex flow meter Bluff Body

Types of Vortex Flow Meter Sensors

Interview on Flow Measurement

Interview Questions on Flow Measurement

Electromagnetic Flow Meters Working Principle

Turbine Meter Custody Transfer

What is Gas Meter and Regulating Station?

volumetric flow measurement for liquids versus gases

Standardized Volumetric Flow

Coriolis Mass Flow Meter Working Animation

Coriolis Meter Explained with Animation

Weir Flow Meter Principle

Measure Flow rate using Level Sensors

Venturi Flow Measurement Principle

Why Flow is Directly Proportional to the Square Root of DP?

Learn More

What Effect on Hydrostatic Level Transmitter if Liquid Density Changes?

What Effect on Hydrostatic Level Transmitter if Liquid Density Changes?

how-to-find-resistor-value

Limitations of Resistors

Comparison between Transit time and Doppler Flow Meter

Difference between Transit time and Doppler Ultrasonic Flow Meter

Cable Glands

Using of MCT instead of Cable Glands on the Cabinets

Switch NO or NC Contact

Normally-open and Normally-closed Switch Contacts

What is a Photoelectric Sensor

What is a Photoelectric Sensor?

Electrical Machines Questions and Answers

Synchronous Motors Quiz

open vs closed loop

Open Loop and Closed Loop Animation

Menu

  • About
  • Privacy Policy
  • Copyright

Quick Links

  • Learn PLC
  • Helping Hand
  • Part Time Job

YouTube Subscribe

Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?