| INSTRUMENTS |
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How accurately can I measure temperature using a Labfacility sensor?
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Can I purchase a complete temperature measurement system from Labfacility?
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My thermocouple is sited a long way from my controller, is this a problem?
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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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Why should I use actual thermocouple connectors instead of ordinary electrical connectors?
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Why offer 2,3 or 4 wire PRTs
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For thermocouple cable and connectors, why are there two colours available for the same calibration?
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What do the thermocouple terms "cold junction compensation" and "linearisation" mean?
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Do I need a power supply when using a transmitter, and what length of extension lead can I run with a transmitter fitted?
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What accuracy loss will I get using a transmitter in line?
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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 I added two identical cable lengths to a simplex sensor for two instrumentation units will I get the same reading as using a duplex sensor?
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Why should I use an insulated hot junction sensor with instrumentation?
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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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Is there a more compact version of the usual in-head transmitter?
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Do all Labfacility in- head transmitters use DIN standard pitch for the fixing holes?
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Can I re-calibrate and / or re-scale the 300TXL Transmitter?
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Is the 300TXL Transmitter CE and RoHS Compliant?
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Can I re-fit a Temperature Transmitter without changing the Thermocouple or PRT Sensor?
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Do I need an enclosure ( head) for the ILTX Transmitter?
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What is the advantage in using in;line Transmitters as opposed to an in-head alternative?
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Is an in-line transmitter less accurate than an in-head alternative?
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Do I need special wiring for use with a Labfacility Transmitter?
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If the Labfacility in-line Transmitter uses plug-in conections is there a danger of reversing polarity?
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Can I cross-connect input and output re Labfacility ILTX Transmitter?
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Is the Labfacility ILTX Transmitter CE and RoHS Compliant?
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Can I re-calibrate and/or re-scale the Labfacility In Line Transmitter?
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Can I retro - fit a Temperature Transmitter?
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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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Can I purchase a complete temperature measurement system from Labfacility?
Yes, there is a wide choice depending on budget and application requirements.
Labfacility E-mail Newsletter - click here for registration. |
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My thermocouple is sited a long way from my controller, is this a problem?
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.
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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Why should I use actual thermocouple connectors instead of ordinary electrical connectors?
Labfacility thermocouple connectors use thermocouple alloys, polarized connections and colour coded bodies to guarantee perfect, error-free interconnections.
FULL Technical specifications are shown within the 12 page THERMOCOUPLE & CABLE BROCHURE - available upon request and in downloadable PDF Format via the PDF button on the Labfacility website.
Labfacility E-mail Newsletter - click here for registration. |
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Why offer 2,3 or 4 wire PRTs
Because all 3 are encountered. Two-wire should be avoided, three-wire is widely used and four-wire gives optimum accuracy. Your instrument will be configured for 2,3 or 4 wire. |
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For thermocouple cable and connectors, why are there two colours available for the same calibration?
Since December 1998, the International colour code to IEC 60584-3 should be observed.
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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Do I need a power supply when using a transmitter, and what length of extension lead can I run with a transmitter fitted?
A 24Vdc, 20mA supply will be needed if this is not incorporated in the measuring instrument. Long runs of copper cable can be used.
Labfacility E-mail Newsletter - click here for registration. |
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What accuracy loss will I get using a transmitter in line?
This depends on the accuracy of the specified transmitter; there will always be some degradation - consult Technical Sales.
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 I added two identical cable lengths to a simplex sensor for two instrumentation units will I get the same reading as using a duplex sensor?
Yes, provided the instrument inputs are truly potentiometric and no measuring current is drawn. Not recommended.
Labfacility E-mail Newsletter - click here for registration. |
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Why should I use an insulated hot junction sensor with instrumentation?
To eliminate the possibility of earth loops resulting in measurement errors and to reduce the danger of voltage pick up from electrical heaters. |
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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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Is there a more compact version of the usual in-head transmitter?
Yes, the Labfacility 300TXL ( low profile) is more compact for use in housings with a smaller depth. Overall height is only 23mm. |
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Do all Labfacility in- head transmitters use DIN standard pitch for the fixing holes?
Yes. |
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Can I re-calibrate and / or re-scale the 300TXL Transmitter?
Yes, quickly and simply; there is a minimal interaction between the span and zero potentiometer adjustments. |
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Is the 300TXL Transmitter CE and RoHS Compliant?
Yes. |
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Can I re-fit a Temperature Transmitter without changing the Thermocouple or PRT Sensor?
Yes, using the Labfacility ILTX Transmitter - this simply connects to the existing sensor output wires. |
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Do I need an enclosure ( head) for the ILTX Transmitter?
No, it connects in-line using miniature connectors and does not require any housing. |
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What is the advantage in using in;line Transmitters as opposed to an in-head alternative?
Convenience and cost saving. The process sensor does not need to be replaced and downtime is much reduced. An expensive head terminated probe assembly is therefore not required. |
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Is an in-line transmitter less accurate than an in-head alternative?
No, performance will be identical to an equivalent alternative. |
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Do I need special wiring for use with a Labfacility Transmitter?
No, but screened cable with copper conductors is advised. |
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If the Labfacility in-line Transmitter uses plug-in conections is there a danger of reversing polarity?
No, as the connections are polarized to prevent this. |
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Can I cross-connect input and output re Labfacility ILTX Transmitter?
Yes, but colour coded connections are used to prevent accidental cross connection. |
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Is the Labfacility ILTX Transmitter CE and RoHS Compliant?
Yes. |
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Can I re-calibrate and/or re-scale the Labfacility In Line Transmitter?
Yes, quickly and simply; there is a minimal interaction betweeen the span zero potentiometer adjustments. |
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Can I retro - fit a Temperature Transmitter?
Yes, provided that the wiring and host instrument are suitable. |
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