Discrete Thermocouples

Temperature Sensors for Industry - LJRTOPE-361, 362, LJRTTJE-361, 363, LJRTKE-361, 362

Applicable for temperature measurement of liquid and gaseous media in high pressure conditions. This Sensor consists of sensing element placed in the thin-walled acid-resistant sheath with connector and flexible lead wire.


Temperature range / sensing element
-50÷400ºC Pt100 class B
-40÷400ºC K, J class 2

– material: steel 1.4541
– diameter d [mm]: 3, 4, 5, 6, 8
– length L[mm]: 30÷1000

Lead wire
– stranded Cu wire or stranded thermocouple wire: 0,22mm2
– fiberglass insulation, metal overbraid
– length Lp[m]: 1,5 (standard)
– Cu wire resistance~0,14 O/m = ~0,36ºC

Other parameters according to requirements




Temperature transmitter application
Temperature transmitter with standard 4÷20mA, 0÷10V output signals and with the HART or PROFIBUS communication protocols can be installed in the control cabinet.

Non-standard design
Immersion length, shape and material of the sheath and other parameters can be customized per client request.

Compensation / Thermocouple wire insulations

Insulation Material Operating temperature range [°C] Properties
PCW (PCV) -10÷105 Applied in mild environmental conditions. Waterproof and flexible.
Yc- polyvinylchloride -10÷105 Applied in mild environmental conditions. Waterproof and flexible.
FEP-teflon -50÷200 Resistant to oils, acids and other aggressive liquids. Good flexibility.
Si-silicone -50÷180 Waterproof, flexible. Applied in high humidity
Ws-fiberglass -60÷400 Good resistance to high temperature Low resistance to liquid penetration.
Notes: Additionally, copper or steel braids/shields are used on wires to prevent electrical noises, Increasing, at the same time, wire insulation resistance to mechanical damages. In case of longer wire lengths grounding may be needed to minimize the noise in measurement circuit

Response time to temperature change dla Pt

Thermowell diameter [mm] Response time [s]
Ø6 t 0,5= 12
t 0,9= 55
Ø8 t 0,5= 20
t 0,9= 85

Tolerance for classes of sensors with resistors Pt acc. to PN-EN 60751

Sensor classes Range of application [°C] Formula for calculating acceptable deviations [°C]
AA 0÷150 T = ±(0,10 + 0,0017 |t|)
A -30÷300 T = ±(0,15 + 0,002 |t|)
B -50÷500 T = ±(0,3 + 0,005 |t|)

|t|- absolute value of temperature


Measurement circuit

1 x Pt100 2 x Pt100 1 x TC 2 x TC
2-wire 3-wire 4-wire 2-wire 3-wire 4-wire 2-wire 3-wire

Tolerance for thermocouple classes acc. to PN-EN 60584

Thermocouple type Class 1 Class 2
Range of application [°C] Tolerance [°C] Range of application [°C] Tolerance [°C]
from -40 to +375
from +375 to +750
±0,004 |t|
from -40 to +333
from +333 to +750
±0,0075 |t|
from -40 to +375
from +375 to +1000
±0,004 |t|
from -40 to +333
from +333 to +1200
±0,0075 |t|


Connection schemes

Pt100 (thermometric resistor)

TC (thermocouple)

Cable types and colours acc. to the norm


J type





K type

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