Resistant thermometers (RTD´s)
The temperature measurement with RTDs depends on the change in resistance of platinum. The sensor is supplied with a constant current and the potential drop which varies with the resistance versus temperature is measured. Basic values and tolerances are specified in DIN EN 60751.
We provide standard resistance thermometer in mineral-insulated design (flexible):
from 0,8mm to 6mm
PT100, PT500, PT1000
Chip (mainly from -50 bis + 400°C)
Ceramics (mainly from -200 bis 600°C)
Class A : +/- (0,15 + 0,002 * t) valid for temperatures from -100 … +650 ° C in 3-or 4-wire circuit
Class B : +/- (0,30 + 0,005 * t) valid for temperatures from -200 … +850 ° C
1/3 DIN B: +/- (0,1 + 0,005 * t) on request
1/5 DIN B: +/- (0,06 + 0,005 * t) on request
1/10 DIN B: +/- (0,03 + 0,005 * t) on request
t = temperature without sign
2-wire, 3-wire, 4-wire
Transition sleeve to flexible cable
Lemo – connector or plug
The bendable portion of the probe begins after the weld, which combines the rigid to the flexible part. To avoid damage to this transition the first bending on the flexible part approximate 10mm after the weld. The minimum bending radius is 3x probe diameter. Sharp bends / kinks to be avoided, as the mineral-insulated cable may be damaged. Particular care is required, the rigid part of the probe. This consists of a closed-sided stainless steel tube which was welded by laser on the mineral-insulated cable. Herein is the platinum resistance embedded. Don´t bent or clipped this rigid part, otherwise the platinum resistance could be damaged.
We offer DAkkS or Factory test for all our probes. So that they are traceable to international standards and can be used as a reference.