Wirewound RTDs

Wirewound RTDs from our supplier and industry leader RTD Products, are known for their wide temperature range and their high stability. All RTDs are manufactured in the UK.

The wirewound RTDs are hand-made in a very delicate process. The Platinum wire is wound into a small coil which is inserted into the holes in a high purity alumina tube. There it is  “partially supported” by a small amount of high temperature glass. This form of construction results in a detector which combines stability with a good resistance to high levels of vibration. Duplex RTDs are also available. The normal temperature range of these ceramic RTDs is between -200ºC and +600ºC.  All standard detectors are capable of withstanding vibration and acceleration levels of up to 30G over the frequency range 10Hz to 1 kHz.

Large changes in pressure have no effect on the accuracy of the RTDs, even though they are not completely sealed. Make sure to always use your RTDs with the correct protective sheaths when using them in fluid or saturated atmospheres. We also offer a glass cover to heremitically seal the RTDs.

All detectors are produced according to the requirements of BS EN 60751:1996 and will show rises of less than 0.3ºC in a stirred ice bath while dissipating 10mW. However, with the more usual 1mA measuring current the rise for a typical detector would be less than 0.002ºC.

Detectors are available in the two BS EN 60751:1996 tolerance classes A or B. Class A is the closer tolerance device offering an interchangeaility of +/-0.06 Ohms (0.15ºC) at 0ºC. The figures for class B are +/-0.12 Ohms (0.3ºC) at 0ºC. Closer tolerance devices are available, commonly known as 1/3, 1/5, or 1/10 DIN. these offer tolerances of 1/3, 1/5 or 1/10 of the class B figures shown above. Detectors can also be made to the Japanese standards JIS C1604:1992.

Detector leadouts are designed to withstand a straight pull of 500 or 2000 gf depending on size, however the ceramic body and the glass anchoring the leads will be damaged by excessive bending or twisting. Ideally, extension leads should be spot welded, but brazing or soldering will be satisfactory when all traces of flux residue are removed.

The specific calibration point for all detectors is 5mm from the ceramic body. Certification of calibration traceable to UKAS at specific temperatures (normally 0ºC or 100ºC) can be provided from the calibration laboratory at extra cost.

Standard Available types

Model number

Diameter
± 0.075mm
(A)

Length
±
0.5mm
(B)

Temperature
Range

Lead
Diameter
(D)

Lead
Resistance
Ohms/mm/lead
(nominal)

Lead
Length
±1mm
(C)

Lead
Material

Sensing
Length

Calibration Point
(from ceramic body)

KMW-0815

0.80

15.00

-200...+600°C

0.15

0.006398

7.00

Pure Pt

13

5 mm

KMW-0915

0.90

15.00

-200...+600°C

0.15

0.006398

7.00

Pure Pt

13

5 mm

KMW-1210

1.20

10.00

-200...+600°C

0.23

0.002721

7.00

Pure Pt

8

5 mm

KMW-1215

1.20

15.00

-200...+600°C

0.23

0.002721

7.00

Pure Pt

13

5 mm

KMW-1415

1.40

15.00

-200...+600°C

0.23

0.002721

7.00

Pure Pt

13

5 mm

KMW-1415 duplex

1.40

15.00

-200...+600°C

0.25

0.002303

7.00

Pure Pt

13

5 mm

KMW-1425

1.40

25.00

-200...+600°C

0.23

0.002721

7.00

Pure Pt

22

5 mm

KMW-1425 duplex

1.40

25.00

-200...+600°C

0.25

0.002303

7.00

Pure Pt

22

5 mm

KMW-1515

1.50

15.00

-200...+600°C

0.23

0.002721

7.00

Pure Pt

13

5 mm

KMW-1515 duplex

1.50

15.00

-200...+600°C

0.25

0.002303

7.00

Pure Pt

13

5 mm

KMW-1608

1.60

8.00

-200...+600°C

0.25

0.002303

7.00

Pure Pt

8

5 mm

KMW-1615

1.60

15.00

-200...+600°C

0.23

0.002721

7.00

Pure Pt

13

5 mm

KMW-1615 duplex

1.60

15.00

-200...+600°C

0.25

0.002303

7.00

Pure Pt

13

5 mm

KMW1625

1.60

25.00

-200...+600°C

0.23

0.002721

7.00

Pure Pt

22

5 mm

KMW-1625 duplex

1.60

25.00

-200...+600°C

0.25

0.002303

7.00

Pure Pt

22

5 mm

KMW2006

2.00

6.00

-200...+600°C

0.25

0.002303

7.00

Pure Pt

6

5 mm

KMW-2015

2.00

15.00

-200...+600°C

0.35

0.001175

7.00

Pure Pt

13

5 mm

KMW-2015 duplex

2.00

15.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

13

5 mm

KMW-2808

2.80

8.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

8

5 mm

KMW-2815

2.80

15.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

13

5 mm

KMW-2815 duplex

2.80

15.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

13

5 mm

KMW-2825

2.80

25.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

22

5 mm

KMW-2825 duplex

2.80

25.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

22

5 mm

KMW-3015

3.00

15.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

13

5 mm

KMW-3015 duplex

3.00

15.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

13

5 mm

KMW-3025

3.00

25.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

22

5 mm

KMW-3025 duplex

3.00

25.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

22

5 mm

KMW-3208

3.00

8.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

8

5 mm

KMW-3215

3.00

15.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

13

5 mm

KMW-3215 duplex

3.00

15.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

13

5 mm

KMW-3225

3.00

25.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

22

5 mm

KMW-3225 duplex

3.00

25.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

22

5 mm

KMW-3815

3.00

15.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

13

5 mm

KMW-3815 duplex

3.00

15.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

13

5 mm

KMW-3825

3.00

25.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

22

5 mm

KMW-3825 duplex

3.00

25.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

22

5 mm

KMW-4515

3.00

15.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

13

5 mm

KMW-4515 duplex

3.00

15.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

13

5 mm

KMW-4530

3.00

30.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

26

5 mm

KMW-4530 duplex

3.00

30.00

-200...+600°C

0.35

0.001039

7.00

10%Pt plated Pd

26

5 mm

Longer leads and non-standard dimensions are also available, please contact our sales team for more information.

 

  Ceramic Wire Wound RTD

 

Tolerances for Platinum resistance according to EN60751

 

Tolerance

Temp. °C

Class B

Class A

1/3 DIN *

1/5DIN *

1/10DIN *

±°C

± Ohms

±°C

± Ohms

±°C

± Ohms

±°C

± Ohms

±°C

± Ohms

-200

1.30

0.56

0.55

0.24

0.44

0.19

0.26

0.11

0.13

0.06

-100

0.80

0.32

0.35

0.14

0.27

0.11

0.16

0.06

0.08

0.03

0

0.30

0.12

0.15

0.06

0.10

0.04

0.06

0.02

0.03

0.01

100

0.80

0.30

0.35

0.13

0.27

0.11

0.16

0.05

0.08

0.03

200

1.30

0.48

0.55

0.20

0.44

0.16

0.25

0.10

0.13

0.05

300

1.80

0.64

0.75

0.27

0.60

0.21

0.36

0.13

-

-

400

2.30

0.79

0.95

0.33

0.77

0.26

-

-

-

-

500

2.80

0.93

1.15

0.38

-

-

-

-

-

-

600

3.30

1.06

1.35

0.43

-

-

-

-

-

-

650

3.60

1.13

1.45

0.46

-

-

-

-

-

-

NOTE

Tolerances are calculated to 2 decimal points and are taken as a fraction of Class B.

* The these values for close tolerance detectors 1/3rd, 1/5th and 1/10th DIN are interpolated and are for guidance only.

 

If you have any further questions, or if you would like a quotation for one of these items, please contact our sales team.