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: Remote Seal Transmitters Temperature Error
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 > Instrumentation Design > Remote Seal Transmitters Temperature Error

Remote Seal Transmitters Temperature Error

Last updated: August 11, 2019 12:18 pm
Editorial Staff
Instrumentation Design
1 Comment
Share
3 Min Read
SHARE

Calculation of temperature error for remote seals

The following equation is used to calculate the temperature error for remote seals:

Contents
Calculation of temperature error for remote sealsExample of calculation of temperature error for remote sealsMeasuring errors based on physical properties always result when using remote sealsDependence of temperature error on diaphragm material

dp = (tRS – tCal) . fRS + (tCap – tCal) . lCap . fCap + (tTR – tCal) . fPF

Where

  • dp – Additional temperature error (inH2O)
  • tRS – Temperature on remote seal diaphragm (generally corresponds to temperature of medium)
  • tCal – Reference (calibration) temperature 68 °F
  • fRS – Temperature error of remote seal
  • tCap – Ambient temperature on the capillaries
  • ICap – Capillary extension length (error given per 3 ft)
  • fCap – Temperature error of capillaries
  • tTR – Ambient temperature on transmitter
  • fPF – Temperature error of oil filling in process flanges of transmitter

Example of calculation of temperature error for remote seals

Existing conditions:

  • Remote Seal type DP Transmitter, fRS = 0.054 inH2O/25 °F
  • Capillary ICap = 2 x 15 ft
  • Capillaries fitted on both sides, fCap= 0.042 inH2O/25 °F/3 ft
  • Filled with silicone oil DC 200-10, fPF = 0.042 inH2O/25 °F
  • Temperature of medium 212 °F, tRS = 212 °F
  • Temperature on capillaries 122 °F, tCap = 122 °F
  • Temperature on transmitter 122 °F, tTR = 122 °F

Required:

  • Additional temperature error of remote seal: dp

Calculation:

dp = (212 °F – 68 °F) . 0.077 inH2O/25 °F + (122 °F – 68 °F) . 15 ft . 2 . 0.042 inH2O/25 °F / 3ft + (122 °F – 68 °F) . 0.042 inH2O/25 °F

dp = 0.444 inH2O + 0.907 inH2O + 0.091 inH2O

Result:

dp = 1.442 inH2O (corresponds to 3.605 % of set span)

Note:

The temperature error determined above only applies to the error resulting from connection of the remote seal.

The transmission response of the respective transmitter is not included in this consideration. It must be calculated separately, and the resulting error added to the error determined above from connection of the remote seal.

Measuring errors based on physical properties always result when using remote seals

Temperature errors of diaphragm seals when connected to pressure, absolute pressure or level transmitters, and with single-sided connection to differential pressure transmitters

Temperature errors of diaphragm seals

Remarks:

  • Values apply to fill fluid: silicone oil DC 200, high-temperature oil, halocarbon oil and Neobee M20.
  • Values apply to stainless steel as the diaphragm material.

Dependence of temperature error on diaphragm material

The errors listed in the tables on pages 2/140 and 2/141 refer to the use of stainless steel as the diaphragm material. If a different material is used, the listed values change by the amount shown in the following table.

Dependence of temperature error on diaphragm material

Source : Siemens

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

Readings Mismatch between Field & Control Room ? Why
What is Hammer Effect in Gauges ?
Pneumatic Signal Piping and Fittings
How to Select a Inductive Proximity Sensor
Transmitter Minimum Span, Accuracy & Turndown
Determine the Status of Lamps and Relays in the Circuit ?
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
1 Comment
  • Prashant Srivastava says:
    July 9, 2019 at 8:27 pm

    kindly explain the diaphragm material used in which kind of fluid. ie hydrogen, chlorine, acid, brine, steam/water etc.

    Reply

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

How to Select a Pneumatic Manifold
Failsafe Wiring Practices
What is Cable Schedule and Junction Box Schedule?
What is Marshalling Cabinet?
Level Instruments Design Rules
15 Loop Diagram Questions
Thermowell Installation near Critical Equipment
Why we use Diode Protection Modules ?

Keep Learning

Instrument Air Quality

Instrument Air Quality

Control Valve Recommended Practices

Control Valve Recommended Practices for Harsh Process Conditions

Instrumentation Role during Steam Blowing

Instrumentation Role during Steam Blowing

Ferrule Example

Ferrules and Cross Ferruling

Differential Pressure Transmitters Static Pressure

What is Static Pressure Limit in DP Transmitter ?

DCS Vs PLC

Difference between DCS & PLC Systems

float-type level switch control a pump

Float-type Level Switch to Control a pump

Twisted Pair Cable Noise Supression

Why We use Shielded Cable and Twisted Pair Cables ?

Learn More

YouTube Channels About Tech and Engineering

Awesome YouTube Channels About Tech and Engineering

Stilling wells

Stilling Wells for Level Measurement

Transducers MCQ

Transducers MCQ

The Role of CNC Machining in Electronics Manufacturing

The Role of CNC Machining in Electronics Manufacturing

Electrical Machines Objective Questions

Electrical Machines MCQ Series 2

Zener Diode

Zener Diode Breakdown Characteristics

Pneumatic Training Course - Download PDF

Pneumatic Training Course – Download PDF

Structured Control Language (SCL) Elements

Value Assignments in SCL Language – Single, Multiple, Combined

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?