Are non mercury glass thermometers accurate?
Are non mercury glass thermometers accurate?
Non-mercury thermometers have scale divisions equal to mercury thermometers. Most range from 0.5° to 1° C. Above 100° C mercury thermometers have an accuracy range of ± 1.5° C, while non-mercury have an accuracy limit of ± 3° C.
In which thermometer is not mercury used?
Answer: Spirit thermometers use a non-toxic alcohol instead of mercury to register the temperature. Like liquid mercury, the alcohol expands in volume as it gets warmer, causing the liquid to move up the thin tube inside the glass thermometer. Digital thermometers contain a device called a thermoresistor.
How do I know if my thermometer is mercury free?
If the liquid in the thermometer bulb is any color other than silver, it is not a mercury thermometer. If the liquid in your thermometer bulb is silver, then the liquid might be: Mercury.
How long can you use a non mercury thermometer?
This handy thermometer contains an environmentally-friendly alternative to mercury and is safe to clean up with mild soap and water if it breaks. Simply place the thermometer under the tongue for 3 minutes for proven clinical accuracy….Specifications.
| Brand | Equate |
|---|---|
| Manufacturer Part Number | 8308965 |
Which is better mercury thermometer or digital?
1. Digital thermometers provide faster results. Digital thermometers provide fast results as opposed to mercury thermometers whose readings are slower to realize because you have to wait for the mercury to heat and then slowly rise to display the temperature.
Why are mercury thermometers no longer used?
The reason: Mercury released into the environment from a broken thermometer is highly poisonous. So government and state agencies have mounted campaigns to end the use of thermometers that contain the liquid metal. Federal and state authorities have lobbied since 2002 for bans on medical mercury thermometers.
Can you still buy mercury thermometers?
Those days have passed. Since 2001, 20 states have banned mercury “fever thermometers” for medical use, and regulations tighten every year. But as of today the federal government has more or less killed the mercury thermometer in the United States—NIST has announced it will no longer calibrate mercury thermometers.
Are there any mercury-free ASTM application thermometers?
These Application Thermometers provide a mercury-free alternative to ASTM mercury thermometers. They provide the same performance as a mercury thermometer, but use a blue liquid formula, which is non-toxic non-caustic, nonhazardous and biodegradable; and, meet or exceed the ASTM E2251 specifications for accuracy and tolerance of uncertainty.
Can a mercury thermometer be used as a primary standard?
Many are available in non-mercury configurations and meet ASTM standards for accuracy tolerance and uncertainties and can be used as a primary standard. NO. NO.
Is the ASTM liquid in glass thermometer safe?
ASTM Non-Mercury Thermometers meet standard test method requirements for use in their referenced applications. The liquid-in-glass thermometers have the same performance characteristics as ASTM Mercury Thermometers, but use safe blue liquid as an alternative to mercury.
Which is the best ASTM precision certified thermometer?
ASTM – Precision Factory Certified Thermometers. Thermco’s ASTM – Precision Factory Calibrated / Certified Thermometers are calibrated against NlST standards and comes with a calibration document showing corrections to the nearest tenth of a scale division traceable to NIST. These thermometers meet with all prescribed ASTM requirements.