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FAQ
- I broke a thermometer containing mercury

 

 Remove all non essential personnel and ventilate the affected area. Wearing suitable protective clothing, clean the area where mercury has been spilt ensuring that all droplets are recovered.

 

 

Use suitable tools such as a suction pipette or spoon.
Under no circumstances should mercury be allowed to enter into the drains.
The mercury recovered after spillage should be stored in a suitably adapted sealed container and sent to a specialized treatment centre for disposal.
We propose mercury thermometers in sealed packs of 15 pcs, containing a powder which can be used to decontaminate affected surfaces. Consult the supplier who provided you with these thermometers.
 

 


What do the accuracy classes mean?

 

 Volumetric glassware are divided into accuracy classes in order to characterize their quality level (accuracy limits).

 

- Classes A/AS:

 

The accuracy limits regarding the nominal volume must be within the figures laid down by DIN and ISO. The tolerances in class AS match those in class A, but here we get units with a short pouring-time(pipette and burettes).The time limits laid down in the standard must be observed. Volumetric glassware in classes A/AS are approved for issuing the certificate of conformity.
 

 

- Class B:

 

The accuracy limits are within the double tolerance of class A/AS as laid down by DIN and ISO.

 


What are your distribution methods?
We normally distribute the products through our distributors’ network and agents. Needless to say, we also sell our products directly to the users, especially those who we don’t have any agents in their city/country.

Is there any difference between selling products to the agents/distributors and selling them to the final consumer?

 Naturally, our prices are much lower for the agents/distributors than the prices for direct sales to consumers. We believe that our agents and distributors have sufficient capacity and stock to meet your requirements.


How laboratory glass can be sterilized?

 

 Working with infectious substances requires great care. Laboratory glass, which has come into contact with these substances, must be cleaned according to the processes described below and then sterilized using saturated steam, According to DIN 58946/1, the minimum time of 20 min at a temperature of 121°c must be observed.

 

What are the micro-pipette rules?

 

1. Never adjust the volume beyond the range of the micropipettes (In variable type). No micropipette should be adjusted below zero μl.  

 

 

2. Never force the volume adjustor dial. If the knob becomes difficult to adjust it probably means that you are exceeding the limits for the micropipette or the micropipette is damaged. Please report the problem to the instructor or TA.

 
 

3. Do not drop micropipettes.

 
 

4. Always use a smooth motion when using the micropipettes. This will help give you accurate measurements and also prevent breakage of pipettes. There should be not “snapping” noises.

 
 

5. Always keep pipettes upright. Store the micropipettes on the mounted rack on your bench when not in use. Never lay a pipette on the bench top.

 
 

6. Always choose to appropriate size pipette for the volume you are measuring.

 
7. Always dispose of tips in appropriate waste containing. Never leave tips in glassware.


Your company does not have any agents in our country. What should we do to contact you and purchase your products?

For further information and future arrangements, please contact our central office in Tehran – International Unit – via phone or Email.


What should I do if I broke the thermometer containing mercury?


 

 Remove all non essential personnel and ventilate the affected area. Wearing suitable protective clothing, clean the area where mercury has been spilt ensuring that all droplets are recovered.

Use suitable tools such as a suction pipette or spoon. Under no circumstances should mercury be allowed to enter into the drains. The mercury recovered after spillage should be stored in a suitably adapted sealed container and sent to a specialized treatment centre for disposal. We propose mercury thermometers in sealed packs of 15 pcs, containing a powder which can be used to decontaminate affected surfaces. Consult the supplier who provided you with these thermometers.
 

Is the thermometer defective if the liquid column separates?

 All types of liquids used in glass thermometers can separate naturally. This separation can be due to transport conditions, unsuitable storage conditions, or incorrect handling after departure from the factory. On arriving in your depot, the liquid can separate if the thermometer is stored horizontally. It is therefore preferable to store the thermometers vertically, with the reservoir at the bottom.

 


How to convert total immersion to partial immersion?
 
 

In some cases, it is not possible to immerse a total immersion thermometer until the summit of the liquid column. Therefore a measure error will occur due to the part of the liquid column that is not immersed.
The emergent column correction C1 can be calculated with an accuracy of approximately 10% by using the formula :
C1 = k N (t1-t)

In the case of mercury k is a coefficient having for value 0.00016 °C-1.
In the case of thermometers filled with red or blue liquid, the value of k varies according to the temperature. As a first approximation, use 0.001 °C-1.
N is the number of degrees Celsius equivalent to the length of the emergent liquid column.
(t1-t) is the difference between the temperature t1 of the reservoir of the thermometer and the average temperature t of the emergent column.
 

 
Example: A thermometer is immersed until the 70 °C graduation, whereas the column of liquid reaches the 100°C graduate.
In this case, N equals 30°C (100-70). If the temperature t1 of the reservoir of the thermometer is 100 °C and the average temperature t of the emergent column is 58 °C, the correction then becomes : C1 = 0.00016 x 30 x (100-58) = + 0.2 °C 

How are the thermometers calibrated?

 

 The thermometers are calibrated in comparison to master instruments, traceable to a National Chain of Calibration, in a thermo stated bath.