What is the difference between an analytical balance and a precision balance?

An analytical balance provides readability of 0.1 mg or better, while a precision balance typically reads to 0.001 g or 0.01 g. Analytical balances include draft shields and are designed for highly sensitive measurements. Precision balances handle larger samples and are less affected by environmental conditions.

What readability do I need for my lab application?

You need a readability that is at least one-tenth of your smallest sample weight or required measurement increment. For example, measuring 100 mg samples may require 0.01 mg readability, while gram-level work may only need 0.01 g. Selecting higher readability than necessary increases cost without improving results.

Do lab balances need to be calibrated?

Yes, all lab balances require regular calibration to maintain accuracy. Calibration ensures measurements remain traceable to certified standards. Internal calibration simplifies this process by automating adjustments, while external calibration requires manual verification with certified weights. In regulated environments, calibration records must be documented and retained.

What is the difference between readability and repeatability?

Readability is the smallest increment of weight a balance will display. Repeatability is the degree of agreement between multiple measurements of the same mass, on the same balance, under the same conditions.

What is the best way to clean my balance to ensure accurate readings?

Inspect and clean before each use. A flannel cloth or soft brush works well for dusting and light cleaning. Use a non-abrasive cleaner for light spills, and a dry flannel cloth for glass parts. Set a regular maintenance schedule for deep cleaning to ensure optimal performance and instrument longevity.

Can vibration affect the accuracy of my balance?

Yes — even slight vibration from a heavy footstep can affect accuracy. Place the balance on a sturdy benchtop away from high-traffic areas such as hallways, elevators, stairways, and doors. If that placement is not possible, an anti-vibration table should be considered.

Motors: 5 Types of Motor Enclosures

When you are choosing a motor enclosure, you may be wondering what all the acronyms in the description mean. TENV? WDN? Here’s a list of the enclosure types and what each indicates in terms of use:

Open Drip-Proof (ODP) Motors are equipped with open enclosures. These motors are suitable for indoor use and clean atmospheres. Ventilator openings are designed to prevent liquids and solids from entering the machine from an angle of 0 to 15°.
Totally Enclosed, Fan-Cooled (TEFC) Motors have an external fan which circulates outside air to the motor.
Totally Enclosed, Nonvented (TENV) Motors do not have air openings. While air does not freely move between the inside and outside, the motor’s construction is not air- or liquid-tight.
Washdown (WDN) Enclosures work well in environments in which regular cleaning or sanitizing is necessary.
Explosion-Proof (XPRF) Motors are completely enclosed to withstand an internal explosion of gas or vapor—the motor frame will not rupture or burst. Use these motors for safe operation in hazardous environments.

3 Comments on "5 Types of Motor Enclosures"

Ahmad Niazi | June 25, 2019 at 5:20 am | Reply

Dear sir ,
Kindly provide quotation for below item and provide delivery time, gross weight

GEARED MOTOR, 1.5 KW, GEAR RATIO: 1/15, MOTOR
FRAME SIZE: 90, SUPPLY: 380V A.C., 60 HZ, 1735 RPM,
4 POLE, MODEL: FHB ; TEFC,
MAKE: HICO (S.KOREA)
QTY—–05 pcs

Your immediate actin shall be highly appreciated
- kadanko | July 1, 2019 at 9:56 am | Reply
  
  Hello:
  
  Thank you for your inquiry. I will send this to our customer service area. In the meantime, you can call 1-800-323-4340 for immediate information.
Masereka Hannington | February 12, 2020 at 9:57 am | Reply

SO INTERESTING LEARNING INFORMATION,Please keep posting.

3 Comments on "5 Types of Motor Enclosures"

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