| CALIBRATION |
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How accurately can I measure temperature using a Labfacility sensor?
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I use many thermocouples in testing and experiments, can I make my own thermocouple junctions?
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Does Labfacility offer any publications to help technicians and students understand the choice and use of thermocouples and PRTs.
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What is the minimum immersion depth for a PRT probe?
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What do the thermocouple terms "cold junction compensation" and "linearisation" mean?
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There are several different types of extension cable construction; is the choice important?
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I need to use "fail-safe" alarms on my process. Can my controller and alarms share the same thermocouple?
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What is the longest thermocouple I can have without losing accuracy?
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What accuracy will I get at a certain temperature using a Pt100 detector; if a better grade detector is used what effect will this have to the accuracy?
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As most instrumentation only takes 2 or 3 wire Pt100s, if I took the correction made on the 3 wire system and incorporated that on to the single leg could I achieve a 4 wire system?
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What is the maximum number of calibration points I can have programmed in to a Tempmaster-100.
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If copper can be used at the same point on each leg of a thermocouple can I use Copper connectors on thermocouples?
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What is Automatic Cold Junction Compensation?
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How can I keep abreast of new developments, products and services from Labfacility?
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| QUESTIONS & ANSWERS |
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How accurately can I measure temperature using a Labfacility sensor?
To published, internationally specified tolerances as standard, typically ( 2.5oC for popular thermocouples, (0.5oC for PRT. Higher accuracy sensors can be supplied to order, e.g. (0.5oC for type T thermocouple, (0.2oC for PRT. All of these values are temperature dependent. A close tolerance, 4-wire PRT will give best absolute accuracy and stability. Contact our
"technical sales" for help.
Labfacility E-mail Newsletter - click here for registration. |
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I use many thermocouples in testing and experiments, can I make my own thermocouple junctions?
Yes, Labfacility can supply a benchtop welder and fine thermocouple wires - it is easy and inexpensive to make unsheathed thermocouples.
For more information click here
Labfacility E-mail Newsletter - click here for registration. |
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Does Labfacility offer any publications to help technicians and students understand the choice and use of thermocouples and PRTs.
Yes, the Labfacility Temperature Handbook - To receive your free copy click here
Labfacility E-mail Newsletter - click here for registration.
ALL Labfacility Brochures now available in a PDF downloadable format - click here |
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What is the minimum immersion depth for a PRT probe?
Usually 150mm or more; increase the immersion until the reading is unchanged.
Labfacility E-mail Newsletter - click here for registration. |
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What do the thermocouple terms "cold junction compensation" and "linearisation" mean?
Refer to the Labfacility Temperature Handbook for a full explanation. With most types of measuring instrument, these functions are automatically applied and do not require user consideration.
Labfacility E-mail Newsletter - click here for registration.
Get your free copy now simply click here and follow the on screen instructions. |
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There are several different types of extension cable construction; is the choice important?
Yes; some are waterproof, some mechanically stronger, some suitable for high or low temperature -
Click here to contact our sales team
Labfacility E-mail Newsletter - click here for registration.
**View PDF Literature on the new PDF Feature button on our Home Page ** |
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I need to use "fail-safe" alarms on my process. Can my controller and alarms share the same thermocouple?
Use duplex sensors, one connected to the controller and the other to the alarm. Your controller may have alarms incorporated in which case you are relying on your control sensor.
Labfacility E-mail Newsletter - click here for registration. |
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What is the longest thermocouple I can have without losing accuracy?
It could be; try to ensure a maximum sensor loop resistance of 100 Ohms for thermocouples and 4-wire PRTs. Exceeding 100 Ohms could result in a measurement error. Note By using a 4-20mA transmitter near the sensor, cable runs can be much longer and need only cheaper copper wire. The instrument must be suitable for a 4-20mA input though. |
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What accuracy will I get at a certain temperature using a Pt100 detector; if a better grade detector is used what effect will this have to the accuracy?
Refer to the Labfacility Temperature Handbook for Pt100 tolerance information.
To apply for your free copy simply click here
Labfacility E-mail Newsletter - click here for registration. |
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As most instrumentation only takes 2 or 3 wire Pt100s, if I took the correction made on the 3 wire system and incorporated that on to the single leg could I achieve a 4 wire system?
No; cable length and ambient temperature variations come into play.
Labfacility E-mail Newsletter - click here for registration. |
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What is the maximum number of calibration points I can have programmed in to a Tempmaster-100.
Ten
For more information click here
Labfacility E-mail Newsletter - click here for registration. |
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If copper can be used at the same point on each leg of a thermocouple can I use Copper connectors on thermocouples?
Yes but only if both legs are maintained at exactly the same temperature. Not recommended.
Labfacility E-mail Newsletter - click here for registration. |
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What is Automatic Cold Junction Compensation?
This is a feature of most measuring instruments which allows for the fact that the thermocouple input termination is at a varying temperature other than stable at 0oC.
Labfacility E-mail Newsletter - click here for registration. |
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How can I keep abreast of new developments, products and services from Labfacility?
Labfacility E-mail Newsletter - click here for registration.
NOTE: Our PDF Feature button on the website is regularly being updated with new Labfacility Product Literature |
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