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Explosion proof type Sheathed thermocouple and resistance temperature detector with spring load_R921,R922 (RS series)

Type: R921, R922


Service intended


Generally, sheathed type temperature sensors are used with thermowell. To maximize the heat-transfer between sheath junction and thermowell, the sheath must be inserted as close as possible to the bottom of the well. However, it is not always possible to determine the actual distance between the end tip of the sheath and the bottom of the thermowell.


Furthemore, heat expansion can damage the sheath which is located inside the thermowell. To prevent this uncertainty and the damage to the sheath, RS series employ the spring load type sheath. This spring load absorbs the impact to the sheath, and protects the sheath from the vibration. Moreover, it is designed to be used in an explosive area.


Standard features




Thermocouple : K, E, J, T, N
R.T.D. : Pt 100 Ω at 0 ℃
TCR : 3,850 ppm/k


Tolerances on temperature reading


■ Thermocouple
Class 1, Class 2 (DIN/IEC584-2, BS/EN60584-2, JIS C1602)
Special, Standard (ASTM E230 E988 ISA-MC96.1)
■ R.T.D.
Class A : ± (0.15 + 0.002 l t l)
Class B : ± (0.3 + 0.005 l t l)


Head material


ALDC (Standard)


Sheath outer diameters


■ Thermocouple
1.0, 1.6, 2.3, 3.2, 4.8, 6.4, 8.0, 9.5 and 12.7 mm
* Double elements is not available for 1.0 and 1.6 mm sheath outer diameters
■ R.T.D.
3.2, 4.8, 6.4 and 8.0 mm




KCS Ex d IIC T6 IP65
KCS Ex tD A21 T85 ℃


Degree of protection





Download:  CATALOG 

Explosion proof type Sheathed TC and RTD with spring load_R921,R922 (RS series)

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