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3.Specification
3-1
3. Specification
3.1 Specification list
Table 3.1 shows the specifications of EH-PT4.
Table 3.1 Specification
Item Specification
Type EH-PT4
Resistance temperature detective Platinum resistance temperature detective Pt100
(IEC 751)
Platinum resistance temperature detective Pt1000
Temperature conversion data Signed 15 bits (In normal state the lowest bit is always “0”.)
Accuracy -20 to + 40 °C (Pt100) ± 0.5 °C
(Note 1) -50 to + 400 °C (Pt100) ± 3 °C
-50 to + 400 °C (Pt1000) ± 6 °C
Temperature measurement range -20 to +40 °C / -50 to +400 °C
(2mA constant current method)
Number of channels 4 channels
Conversion time About 1s / 4 channels
Insulation Between channel and PC Photocoupler insulation
Between channels Non-insulation
External power supply 24V DC ±10% 100mA max.
Internal current consumption
(5 V DC)
200mA max.
External wiring resistance 400 ohm max. / channel
External wiring Shielded wire
Additional function Linearization
Error detection
-20 to +40 °C (Pt100)
-50 to +400 °C (Pt100/ Pt1000)
H7FFF is outputted at –25 °C or less, or at +45 °C or higher
H7FFF is outputted at –60 °C or less, or at +410 °C or higher
Processing for disconnection (Note 2) H7FFF is outputted to channel.
Note 1: The accuracy is the value when 10 minutes pass after the start of power feeding. Just after
power is fed, the value may increase slightly. Because a resistance temperature detective
has an error, confirm it beforehand.
Note 2: This is the case when the current terminal wiring is broken. In case the voltage terminal
wiring is broken, the data becomes unspecified. (“H” of “H7FFF” means the following data is
hexadecimal.)