×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Temperature Indicator/transmitter reading is affected by weather changes or not

Temperature Indicator/transmitter reading is affected by weather changes or not

Temperature Indicator/transmitter reading is affected by weather changes or not

(OP)
Hi,

Could you please, help me to understand that, if the temperature transmitter reading can be affected by the weather changes or not?
Ex: Just imagine the temperature indicator/transmitter is exposed to sun light in summer. Will it cause the reading to be high than real temperature of fluid or there is some kind of protection/isolation to prevent this error?

RE: Temperature Indicator/transmitter reading is affected by weather changes or not

Short answer- YES. Sunlight shining on your sensor will definitely cause a higher than actual temperature reading. Depending on the accuracy needed, you can probably just shield the sensor with a cover of low emissivity (e.g. gloss white). Make sure the sensor is mounted such that air can circulate freely.

Brad Waybright

It's all okay as long as it's okay.

RE: Temperature Indicator/transmitter reading is affected by weather changes or not

Your transmitter will have temperature compensation. The spec sheet should show the limits of the temperature compensation.
The transmitter will give accurate readings as long as the transmitter temperature is within the limits of the internal compensation circuit.
We had an issue of an application of a temperature transmitter which would be used in an ambient temperature that at times would be below the compensation range.
We conducted some tests by cooling the transmitter and checking the indicated temperature against the actual temperature.
We found that the error matched the amount that the temperature was below the compensation limit.
The intended use was a safety shutdown of a stack. We reasoned that if conditions caused to stack temperature to rise to a dangerous level on a cold day that it would not be a problem and may actually be advantageous if the process shut down at a lower stack temperature.
The transmitter was used and worked well.
Measure the temperature of your transmitter on a day when the sunlight is shining brightly on the transmitter. Reconcile this with the listed limits of the internal compensation.

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: Temperature Indicator/transmitter reading is affected by weather changes or not

Google instrument sunshield

Dumb, cheap transmitters might very well have no temperature compensation. You get what you pay for.

The device's spec sheet will tell you over what (ambient) temperature range it can be used, but "ambient" means the temperature of the transmitter housing (and the transmitter inside), not the air around it. Housing can be hotter than ambient air.

RE: Temperature Indicator/transmitter reading is affected by weather changes or not

(OP)
Thanks a lot for the explanations :)

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

White Paper – Choosing the Right Spring Loaded Connector
In today’s cost-sensitive world, designers are often driven to specify the lowest cost solution for every aspect of their designs to ensure that their solution is competitively priced and their company remains profitable. However, specifying a low-cost, low-quality connector solution can result in premature failure, considerable re-work costs and damage to reputations. Download Now
eBook – Own the Lifecycle: Sustainable Business Transformation
Increasingly, product and services companies are seeking more information and control in the operational lifecycle of their products, including service and use. Better information about the operational lifecycle, and the ability to use that information, requires more than just unstructured data flowing back from products in the field. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close