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The SM-PT100 is used for 2, 3 or 4-wire temperature measurement using PT100 sensors driven by an on-board constant current source.
Capable of connecting sensors measuring temperatures between -200ºC and +850ºC, the SMTHERM uses a fast 16-bit delta-sigma A/D converter that ensures an absolute measurement accuracy of 0.2ºC.

► 2, 3 or 4-wire PT100 sensor inputs
► Open sensor detection
► Self calibration (on-board EEPROM)
► Overvoltage protection
► 2 user configurable LEDs

TECHNICAL SPECIFICATIONS

Input
Function : PT100 temperature measurement with 4-wire

connection supported and open sensor detection

Temp. Range : -200ºC to +850ºC
Temp. Drift : 1 LSB/ºC (not compensated)

Conversion Time: Typ. 125ms, max. 500ms (depending on filter settings)

Input Impedance : 10 MW(min.)
Resolution : 16-Bit
Absolute Accuracy : ± 0.2ºC (sensor errors excluded)
Calibration : Self calibration
Linearisation : By software
Overvoltage Protection
Continuous : ± 25V (power connected)

± 35V (power disconnected)

Common
Isolation : 1.0 kV optoisolated from the system
EEPROM : 256 Byte serial EEPROM for calibration data
Front Panel : 2 Red LEDs (user configurable)
Weight : 40g
Power Cons. : 350mW (min.), 450mW (max.)
Temp. Ranges : 0ºC to +70ºC

-40ºC to +85ºC (opt. E2)

-55ºC to +85ºC (storage)

Humidity : 5% to 95% non-condensing