Nickel Film

Temperature Sensor

TD4

Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com

189

Issue D · 08.03

Welwyn Components

Construction

A nickel film is deposited onto a high quality ceramic rod.

Nickel-plated steel caps are force fitted to the rod and

termination wires are welded to the caps.

A laser is used to adjust the resistance value of the sensor by

cutting a helix into the film The body is protected with a high

purity organic coating.

Terminations

Material

Solder-coated copper wire

Strength

The terminations meet the requirements of

IEC 68.2.21

Solderability

The terminations meet the requirements of

IEC115-1 Clause 4.17.3.2

Marking

TD4: Type reference, resistance and tolerance code.

Packaging

The standard packaging is in boxes. Taped sensors (on reel or

in ammo pack) can also be supplied by special request.

Actual Performance

Long term stability (1000hrs @ 155°C)

Resistance @ 25°C

%

0.18

Equivalent to

°C

0.4

Thermal shock (10 cycles -55°C to 155°C)

Resistance @ 25°C

%

0.02

Equivalent to

°C

0.04

Performance Data for R0 = 100ohms

Physical Data

Type

TD4

Small box

250

Large box

1,000

Reel

5,000

Ammo pack

1,000

Dimensions (mm) & Weight (g)

L max

D max

f min

d nom

PCB

Min

Wt.

mounting

Bend

nom

centre

Radius

TD4

7.2

2.5

30

0.6

10.2

0.6

0.24

L

D

f

d

Standard Quantities Per Package

TD4 tolerance vs temperature

-5

-4

-3

-2

-1

0

1

2

3

4

5

-75

-50

-25

0

25

50

75

100

125

150

175

Temperature (

°C)

TD4_D.qxd

13/8/03

3:12 pm

Page 2