Data Sheet

MICRO SWITCH Sensing and Control
Temperature Sensors HEL-700 Series PLATINUM RTDs
FUNCTIONAL BEHAVIOR
R
T
= R
0
(1+AT+BT
2
-100CT
3
+CT
4
)
RT = Resistance (W) at temperature T (°C)
R
0
= Resistance (W) at 0°C
T = Temperature in °C
A = a +
a d B = -a d C
T<0
=-a b
100 100
2
100
4
CAUTION
PRODUCT DAMAGE
The inherent design of this component causes it to be
sensitive to electrostatic discharge (ESD). To prevent
ESD-induced damage and/or degradation, take normal
ESD precautions when handling this product.
Trim
Tolerance
Standard
±0.2%
Optional
±0.1%
Temperature
(°C)
±∆R
(Ω)
±∆T
(°C)
±∆R
(Ω)
±∆T
(°C)
-200 6.8 1.6 5.1 1.2
-100 2.9 0.8 2.4 0.6
0 2.0 0.5 1.0 0.3
100 2.9 0.8 2.2 0.6
200 5.6 1.6 4.3 1.2
300 8.2 2.4 6.2 1.8
400 11.0 3.2 8.3 2.5
500 12.5 4.0 9.6 3.0
600 15.1 4.8 10.4 3.3
ACCURACY VS TEMPERATURE
EL-700 platinum RTDs are available in two base
resistance trim tolerances: ±0.2% or ±0.1%. The
corresponding resistance interchangeability and tempera-
ture accuracy for these tolerances are:
NIST CALIBRATION
NIST traceable calibration provides resistance readings at
1, 2 or 3 standard temperature points to yield a resis-
tance versus temperature curve with up to 10 times better
accuracy. A calibration report is as follows:
Calibration 1 Point 2 Point 3 Point
T (°C) ±
∆
T (°C) ±
∆
T (°C) ±
∆
T (°C)
-200 0.9 -- --
-100 0.5 0.27 0.15
0 0.03 0.03 0.03
100 0.4 0.11 0.08
200 0.8 0.2 0.1
300 1.2 0.33 0.13
400 1.6 0.5 0.17
500 2.0 0.8 0.25
600 2.6 1.2 0.33
CONSTANTS
Alpha,
α
(°C
-1
)
0.003750
±0.000029
0.003850
±0.000010
Delta
, δ
(°C)
1.605 ± 0.009 1.4999 ± 0.007
Beta
, β
(°C)
∗
0.16 0.10863
A
(°C
−1
)
3.81x10
-3
3.908x10
-3
B
(°C
−2
) -6.02x10
-7
-5.775x10
-7
C
(°C
−4
)
∗
-6.0x10
-12
-4.183x10
-12
∗
Both
β
= 0 and C = 0 for T > 0°C
RESISTANCE VS TEMPERATURE CURVE