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wire-wound |
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| platinum
resistance temperature detectors |
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| TDI
Wire Wound Platinum Resistance Temperture Detectors are built to the
highest standard by a team whose skills and expertin this highly specialised
field are unsurpassed. |
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| The
most commonly used detectors are described here. A further standard
range is manufactured to BS 2G. 148: details on request. |
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| For
specific applications, TDI temperature detectors can be supplied with
other electrical charactoristics, and detectors can also be manufactured
to meet individual requirements. Standard range detectorbe supplied
from stock to tolerances closer than ths can also ose specified; details
below.
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| All stages of manufacture
are closely controlled to ensure that all electrical and mechanical
requirements are met each individual setector is tested to confirm
that it meets the specification. |
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| Lead
diameter and resistance |
| Ceramic
dia., mm |
Lead dia., mm |
Lead resistance |
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Ohms/mm |
| 4.5 |
0.4 |
0.0009 |
| 3.2 |
0.4 |
0.0009 |
| 2.8 |
0.4 |
0.0009 |
| 2.4 |
0.4 |
0.0009 |
| 2.0 |
0.265 |
0.0020 |
| 1.6 |
0.265 |
0.0020 |
| 1.5 |
0.265 |
0.0020 |
| 1.2x15mm long |
0.25 |
0.0023 |
| 1.2x10mm long |
0.15 |
0.0063 |
| 0.9 |
0.15 |
0.0063 |
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| Detectors are available from stock with tolerances
1/2, 1/3, 1/5, and 1/10 of those specified on the preceding
page. |
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All detectors are checked
at a point 5mm from the ceramic. |
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Detectors typically conform
to BS Stability figures ±0.05% for ten thermal cycles from 0 to 600°C
and from—220 to 00°C. |
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Stability is
a compromise between vibration per-formance, and various options can be
provided: please ask for details. |
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| Thermal response
time |
| Ceramic dia., mm |
Typical time to
63% of final value, |
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60 C step, water
flowing at 1 m//s |
| 4.5 |
0.7 secs |
| 3.2 |
0.4 secs |
| 2.8 |
0.4 secs |
| 2.4 |
0.3 secs |
| 2.0 |
0.25 secs |
| 1.6 |
0.15 secs |
| 1.5 |
0.1 secs |
| 1.2 |
0.08 secs |
| 0.9 |
0.03 secs |
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Less than 0.3°C wth
10mW dissipation when tested in a stirred ice bath. |
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Detectors are unharmed
by a vibration of 30G over the frequency range of 1OHz to 1 kHz. |
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| TDI
Wire Wound Platinum Resistance Temperature Detectors are manufactured
by: |
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| Thermal Developments International, Southport,
England |
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| Exclusive USA representative: |
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