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1.Introduction
1-3
1.2 Precautions on Use
(1) Before the installation and removal of the module, turn off the power.
(2) Before the connection of the external wiring and removal of the terminal board, turn off the
power.
(3) The terminal board handles fine signals. Therefore upon handling the module or wiring, be
careful not to apply a voltage on it by mistake or leave it under the influence by excessive static
electricity.
(4) Upon the connection of external wiring, before work, eliminate static electricity by touching a
grounded metal bar to prevent it from being damaged by excessive static electricity charged on
the human body. To prevent a malfunction due to static electricity do not touch the terminal
during power feeding.
(5) When the connection cable to a resistance temperature detective is cut, the temperature
conversion data becomes abnormal. If the temperature data exceeds the normal range to protect
the external devices, adjust the control system so that the external devices operate with safety.
(6) If the resistance of a resistance temperature detective (RTD) exceeds 250 ohm (corresponding to
about 410 °C ) at PT100, or 2500 ohm(corresponding to about 410 ºC ) at PT1000, except when
the line is broken, the temperature conversion data is unstable.
1.3 Features
(1) EH-PT4 applies for two kinds of platinum resistance temperature detectives:
Pt100(IEC 751) and Pt1000.
(2) Temperature measurement range: Three kinds of ranges(selected by switch)
Resistance temperature
detectives
Temperature measurement
range(ºC)
Accuracy(°C)
Pt100 -50 to + 400 ± 3
Pt100 -20 to + 40 ± 0.5
Pt1000 -50 to + 400 ± 6
(3) Because the accuracy of the temperature measurement range -20 to +40ºC is ± 0.5 ºC, EH-PT4 is
suitable for exact measurement.
(4) Temperature conversion data: signed 15 bits.
(5) Number of Inputs: 4 channels, 3-wire system.