Knowledge
JIS standard for RTD
Extracted from JIS C 1604-1997
JPt100 depends on JIS C 1604-1989.
R100/R0 of the resistor
| Symbol | Nominal resistance(Ω at 0℃) | R100/R0 value |
|---|---|---|
| Pt100 | 100 | 1.3851 |
| JPt100 | 100 | 1.3916 |
(NOTE) R100 is the resistance of the resistance elements at 100℃ R0 is the resistance of the resistor at 0℃
Classification according to operating temperature range
| Symbol | Classification | Operating temperature range(℃) |
|---|---|---|
| L | For low temperature | -200 ～ 100 |
| M | For medium temperature | 0 ～ 350 |
| H | For high temperature | 0 ～ 650(*) |
（*）The sheathed RTD and JPt100 shall be 500℃.
Class and specified current
| Symbol | Class | Tolerance(℃) | Specified current (mA) |
|---|---|---|---|
| Pt100 (JPt100) |
A | ±(0.15+0.002|t|) | 0.5、1、2 |
| B | ±(0.3+0.005|t|) | 0.5、1、2、(5) |
(NOTE) |t| is the measured temperature in degrees Celsius, which is independent of the + and – symbol.
Temperature tolerance
| Measured temperature | Tolerance(℃) | |
|---|---|---|
| Class A | Class B | |
| -200 | ±0.55 | ±1.3 |
| -100 | ±0.35 | ±0.8 |
| 0 | ±0.15 | ±0.3 |
| 100 | ±0.35 | ±0.8 |
| 200 | ±0.55 | ±1.3 |
| 300 | ±0.75 | ±1.8 |
| 400 | ±0.95 | ±2.3 |
| 500 | ±1.15 | ±2.8 |
| 600 | ±1.35 | ±3.3 |
| 650 | ±1.45 | ±33.6 |
Insulation resistance and withstand voltage
| Test temperature(℃) | Insulation resistance(MΩ) | Test voltage(V) |
|---|---|---|
| Room temperature | 100 | 10 ～ 100 |
| 100 ～ 300 | 10 | 10 or less |
| 301 ～ 500 | 2 | |
| 501 ～ 650(*) | 0.5 |
（*）Not applicable to sheathed RTD and JPt100.
The withstand voltage shall be withstanded when the test RTD is kept at room temperature and an AC voltage with a 500V close to the sine wave of frequency 50Hz or 60Hz is applied between the terminal and the protective tube for one minute. However, for those with a protective tube outside diameter 4.5mm or less, the test voltageshall be 1/2.
