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Name of document: 30910034 Index B
Status: 03/2014
Platinum Resistance Temperature Detector HD 421
The measuring point for the nominal resistance is defined at 4mm from the end of the sensor body.
HD 421 Pt 100-type platinum temperature sensors are characterized by long-term stability, precision over a
broad temperature range and compatibility. Main application area is the process technology.
Specification DIN EN 60751
Temperature range -70°C up to +850°C
Tolerance Class B: -70°C up to +650°C
Tolerance Class 2B: -70°C up to +850°C
Temperature coefficient TCR= 3850 ppm/K
Leads Pt- wire
Lead length (L) 6mm ±1mm
Long-term tests 1000h at 850°C (energized, open)
smaller then the allowed deviation according
to DIN B. 1000 h at 650°C (under current
as clean MI-type) smaller then the allowed
deviation according to DIN B
Vibration resistance at least 40g acceleration with 8ms half sine
wave signal, depends on the installation
Shock resistance at least 100g acceleration at frequencies
from 10Hz up to 2000Hz, depends on the
installation
Environmental conditions Unhoused for dry environment only,
Up to 650°C in housings also as clean MI-type
possible, above 650°C no reducing
atmosphere, free air admission necessary
Insulation resistance >100 M at 20°C; >2 M at 650°C
Self heating 0.2 K/mW
Response time Water current (v= 0.4m/s): t0.5 = 0.05s
t0.9 = 0.17s
Air stream (v= 2m/s): t0.5 = 3.3s
t0.9 = 13.0s
Measuring current 20°C max. 5mA; 850°C max. 2.8mA
(self heating has to be considered)
Note Other tolerances, values of resistance and wire
lengths are available on request.
Nominal
Resistance R0 Tolerance
DIN EN 60751
1996-07
Tolerance
DIN EN 60751
2009-05
Order Number
Plastic Box
100 Ohm at 0°C Class B (to +650°C)
Class 2B (to+850°C) F 0.3 (to +650°C)
F 0.6 (to +850°C) 32 208 228
1901 Route 130
North Brunswick, NJ 08902
Phone 732-940-4400 Fax 732-940-4445
Email info.hst-us@heraeus.com
www.hst-us.com
Heraeus Sensor Technology USA
