Thermocouple Probes & RTDs

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MI Thermocouple & RTD Range

TRM design and manufacture a wide range of mineral insulated thermocouples and RTD sensors to suit almost any application. As one of the worlds leading mineral insulated thermocouple cable manufacturers, our range of MI thermocouples includes PT100 temperature sensors.

Mineral insulated thermocouple probes and cables manufactured by TRM are made up of a metal conductor embedded in a compacted Magnesium oxide (inorganic) insulant inside a metal sheath.

The inorganic nature of the construction enables the cables to operate at high temperatures for long periods of time in extremely harsh environments e.g. petro-chemical, reactor vessels and other applications where the integrity of the cable is most important.

Operating temperatures

Operating temperatures are determined by the operational temperature of the thermocouple materials and sheath material, whichever is lower.

Cable with corrosion-resistant grades of stainless steel and nickel alloys sheath typically up to 600°C – 900°C Cable with heat resistant stainless steel and nickel alloys sheath typically up to 1000°C – 1300°C

Thermocouple cable sheath material	Transducer cable
Choose one of the following: 304 – AISI 304 Stainless Steel 321 – AISI 321 Stainless Steel 310 – AISI 310S Stainless Steel 316L – AISI 316 Low Carbon Stainless Steel 316Ti – AISI 316 Titanium Stabilised Stainless Steel 347 – AISI 347 Stainless Steel 446 – AISI 446 Stainless Steel 600 – Inconel 600 601 – Alloy 601 625 – Alloy 625 NIC – Nicrobell Other materials on request	Choose one of the following: 304 – AISI 304 Stainless Steel 321 – AISI 321 Stainless Steel 310 – AISI 310S Stainless Steel 316L – AISI 316 Low carbon Stainless Steel 316Ti – AISI 316 Ti stabilised Stainless Steel Other materials on request
No. of conductors – Choose one of the following: Two conductors Four conductors Six conductors	Two conductors Three conductors Four conductors Six conductors
Conductor materials – Choose one of the following thermocouple types: K, N, J, E, T	Copper Nickel Other materials on request
Conductor configurations: Alternating as standard Adjacent on request	Evenly spaced Wide spaced

Insulation material

Magnesium Oxide (MgO)

Other materials on request

Conductor Configurations

Thermocouple Junction Types

IJ – Insulated junction

Conductors welded together and insulated from the sheath

BJ – Bonded or grounded junction

Conductors and sheath welded together

EJ Exposed junction

Conductors welded together and exposed outside sheath closure

Main Thermocouple Probe Design Types

With plain pot

With 8 mm ISO seal

Can be supplied with 8 mm ISO locknuts to terminate the thermocouple if necessary

With transmitter mounting plate

Other designs on request

Ordering information

To order please specify the following:

Part reference (see example)
Design lengths are specified in mm, including immersion length and tail
Type of junction
Any accessories required g. lock nuts or termination glands. – Any special design and test requirements.

Please contact us with your requirements.

Thermocouple Probes and Cable Reference

RTD Probe Design Types

Three-wire with solid tails and gland

Four-wire with flexible tail

Ordering information

To order please specify the following:

Part reference (see example)
Design lengths are specified in mm, including immersion length, route length and tail
- Tail type
Seal type
Any accessories required e.g. termination glands. – Any special design and test

Please contact us with your requirements.

Tail type

Type	Configuration	Colour code
PTFE insulated flexible	3 wire	2 Red & 1 White
PTFE insulated flexible	4 wire	2 Red & 2 White
PTFE insulated solid	3 wire	2 Red & 1 White
	4 wire	2 Red & 2 White
	3 wire & earth tail	2 Red, 1 White, & 1 Yellow/Green

Seal type

Fitting	Type	Tail type
Crimp	Plain	3 wire flexible
Silver solder	Plain	4 wire flexible
	Plain	3 wire solid
	Plain	4 wire solid
	Earth tail	3 wire & earth tail solid

Termination fittings

Reference	Material	Fitting size
TGMV4516	Brass	16 mm ISO Metric
TGMV6016
TGMV4520		20 mm ISO Metric
TGMV6020
TGMV4516	Stainless Steel	16 mm ISO Metric
TGMV6016
TGMV4520		20 mm ISO Metric

Notes

RTD probes are manufactured to BS EN60751-2008 (IEC751).
Tolerance classes are to BS EN60751-2008.
Minimum immersion length = 100mm. Standard tail length = 150mm
Maximum operating temperature = 550 C
Minimum operating temperature: Grade A = -196 C, Grade B = 0 C

Please contact us with your requirements.

Resistance Thermometers and Transducer Cable Reference

Thermocouple Tolerance Limits

Tolerance reference junction 0°C

Type	Temperature Range	EN 60584-2		ASTM E230-03
Type	Temperature Range	Class 1	Class 2	Special Limit	Standard Limit
K	-40°C to 1000°C	±1.5°C or 0.004·t (whichever is greater)	±2.5°C or ±0.0075·t (whichever is greater)
K	0°C to 1260°C			±1.1°C or 0.004·t (whichever is greater)	±2.2°C or ±0.0075·t (whichever is greater)
N	-40°C to 1000°C	±1.5°C or 0.004·t (whichever is greater)	±2.5°C or ±0.0075·t (whichever is greater)
N	0°C to 1260°C			±1.1°C or 0.004·t (whichever is greater)	±2.2°C or ±0.0075·t (whichever is greater)
J	-40°C to 750°C	±1.5°C or 0.004·t (whichever is greater)	±2.5°C or ±0.0075·t (whichever is greater)
J	0°C to 760°C			±1.1°C or 0.004·t (whichever is greater)	±2.2°C or ±0.0075·t (whichever is greater)
E	-40°C to 800°C	±1.5°C or 0.004·t (whichever is greater)	±2.5°C or ±0.0075·t (whichever is greater)
E	0°C to 870°C			±1.0°C or 0.004·t (whichever is greater)	±1.7°C or ±0.005·t (whichever is greater)
T	-40°C to 350°C	±0.5°C or 0.004·t (whichever is greater)	±1.0°C or ±0.0075·t (whichever is greater)
T	0°C to 370°C			±0.5°C or 0.004·t (whichever is greater)	±1.0°C or ±0.0075·t (whichever is greater)

If what you require is not listed below, please contact us.

Select a Product:

Thermocouple Cable Metric Range - Two core cable

Reference	Cable diameter	No of conductors	Conductor diameter	Sheath thickness	Insulation thickness	Nominal conductor resistance at 20 °C Loop,					Coil length
	mm		mm	mm	mm	Ohm/m	Ohm/m	Ohm/m	Ohm/m	Ohm/m	m
	nom		min	min	min	Type K	Type N	Type J	Type T	Type E	nom
T2x--05*	0.50±0.02	2	0.08	0.06	0.04	126	171	78	65	153	300
T2x--10*	1.00±0.02	2	0.15	0.12	0.08	31.5	43	19.6	16	38	300
T2x--15*	1.50±0.02	2	0.23	0.18	0.12	14	19	8.7	7.2	17	300
T2x--20*	2.00±0.03	2	0.30	0.24	0.16	7.9	10.7	4.9	3.8	9.6	300
T2x--30*	3.00±0.03	2	0.45	0.30	0.24	3.5	4.8	2.2	1.8	4.25	300
T2x--45*	4.50±0.03	2	0.68	0.45	0.36	1.56	2.1	0.97	0.8	1.9	140
T2x--60*	6.00±0.05	2	0.90	0.60	0.48	0.88	1.2	0.54	0.45	1.1	80
T2x--80*	8.00±0.05	2	1.20	0.80	0.64	0.49	0.67	0.31	0.25	0.6	40

Substitute “x” with the required thermocouple type reference
Substitute *** with required sheath material reference

Thermocouple Cable Metric Range - Four core cable

Reference	Cable diameter	No of conductors	Conductor diameter	Sheath thickness	Insulation thickness	Nominal conductor resistance at 20 °C Loop,					Coil length
	mm		mm	mm	mm	Ohm/m	Ohm/m	Ohm/m	Ohm/m	Ohm/m	m
	nom		min	min	min	Type K	Type N	Type J	Type T	Type E	nom
T4x--05*	0.50±0.02	4	0.06	0.06	0.03	224	304	139	116	272	300
T4x--10*	1.00±0.02	4	0.11	0.12	0.06	59	80	36	30	71	300
T4x--15*	1.50±0.02	4	0.17	0.18	0.09	26	35	16	13	31	300
T4x--20*	2.00±0.03	4	0.22	0.24	0.12	14.7	19.9	9.1	7.1	17.9	300
T4x--30*	3.00±0.03	4	0.33	0.30	0.18	6.5	8.9	4.1	3.3	7.9	300
T4x--45*	4.50±0.03	4	0.50	0.45	0.27	2.89	3.88	1.79	1.48	3.51	140
T4x--60*	6.00±0.05	4	0.66	0.60	0.36	1.64	2.23	1.00	0.84	2.05	80
T4x--80*	8.00±0.05	4	0.88	0.80	0.48	0.91	1.25	0.58	0.46	1.12	40

Substitute “x” with the required thermocouple type reference Substitute
*** with required sheath material reference

Please contact us with your requirements.

Thermocouple Cable Metric Range - Six core cable

Reference	Cable diameter	No of conductors	Conductor diameter	Sheath thickness	Insulation thickness	Nominal conductor resistance at 20 °C Loop,					Coil length
	mm		mm	mm	mm	Ohm/m	Ohm/m	Ohm/m	Ohm/m	Ohm/m	m
	nom		min	min	min	Type K	Type N	Type J	Type T	Type E	nom
T6x--05*	0.50±0.02	6	0.06	0.06	0.03	224	304	139	116	272	300
T6x--10*	1.00±0.02	6	0.11	0.12	0.05	59	80	36	30	71	300
T6x--15*	1.50±0.02	6	0.17	0.18	0.08	26	35	16	13	31	300
T6x--20*	2.00±0.03	6	0.22	0.24	0.10	14.7	19.9	9.1	7.1	17.9	300
T6x--30*	3.00±0.03	6	0.33	0.30	0.15	6.5	8.9	4.1	3.3	7.9	300
T6x--45*	4.50±0.03	6	0.50	0.45	0.23	2.89	3.88	1.79	1.48	3.51	140
T6x--60*	6.00±0.05	6	0.66	0.60	0.30	1.64	2.23	1.00	0.84	2.05	80
T6x--80*	8.00±0.05	6	0.88	0.80	0.40	0.91	1.25	0.58	0.46	1.12	40

Substitute “x” with the required thermocouple type reference Substitute
*** with required sheath material reference

Transducer Cable Range - Two core cable

Reference	Cable diameter	No of conductors	Conductor diameter	Sheath thickness	Conductors PCD	Nominal conductor resistance at 20 °C		Coil length
	mm		mm	mm	mm	Ohm/m	Ohm/m	m
	nom		min	min	min	R2C-	R2D–	nom
R2x--15*	1.50±0.02	2	0.30	0.23	0.45	0.243	1.358	300
R2x--16*	1.60±0.02	2	0.32	0.24	0.48	0.214	1.194	300
R2x--30*	3.00±0.03	2	0.60	0.30	1.00	0.061	0.340	300
R2x--32*	3.20±0.03	2	0.64	0.32	1.07	0.053	0.298	300
R2x--45*	4.50±0.03	2	0.90	0.45	1.50	0.027	0.151	140
R2x--48*	4.80±0.03	2	0.92	0.48	1.59	0.026	0.144	140
R2x--60*	6.00±0.05	2	1.20	0.60	2.00	0.015	0.085	80
R2x--64*	6.40±0.05	2	1.28	0.64	2.13	0.013	0.075	80

Substitute “x” with required transducer type reference Substitute *** with required sheath material reference

Please contact us with your requirements.

Transducer Cable Range - Three core evenly spaced cable

Reference	Cable diameter	No of conductors	Conductor diameter	Sheath thickness	Conductors PCD	Nominal conductor resistance at 20 °C		Coil length
	mm		mm	mm	mm	Ohm/m	Ohm/m	m
	nom		min	min	min	R3C-	R3D–	nom
R3x--30*	3.00±0.03	3	0.45	0.30	1.04	0.108	0.604	300
R3x--32*	3.20±0.03	3	0.48	0.32	1.11	0.095	0.531	300
R3x--45*	4.50±0.03	3	0.68	0.45	1.56	0.048	0.268	140
R3x--48*	4.80±0.03	3	0.72	0.48	1.67	0.042	0.236	140
R3x--60*	6.00±0.05	3	0.90	0.60	2.09	0.027	0.151	80
R3x--64*	6.40±0.05	3	0.96	0.64	2.23	0.024	0.133	80

Substitute “x” with the required transducer type reference Substitute
*** with required sheath material reference

Transducer Cable Range - Four core evenly spaced cable

Reference	Cable diameter	No of conductors	Conductor diameter	Sheath thickness	Conductors PCD	Nominal conductor resistance at 20 °C		Coil length
	mm		mm	mm	mm	Ohm/m	Ohm/m	m
	nom		min	min	min	R4C-	R4D–	nom
R4x--30*	3.00±0.03	4	0.34	0.30	1.04	0.047	1.057	300
R4x--32*	3.20±0.03	4	0.36	0.32	1.11	0.095	0.943	300
R4x--45*	4.50±0.03	4	0.50	0.45	1.56	0.048	0.489	140
R4x--48*	4.80±0.03	4	0.54	0.48	1.67	0.042	0.419	140
R4x--60*	6.00±0.05	4	0.68	0.60	2.09	0.027	0.264	80
R4x--64*	6.40±0.05	4	0.72	0.64	2.23	0.024	0.236	80

Substitute “x” with the required transducer type reference Substitute
*** with required sheath material reference

Please contact us with your requirements.

Transducer Cable Range - Six core evenly spaced cable

Reference	Cable diameter	No of conductors	Conductor diameter	Sheath thickness	Conductors PCD	Nominal conductor resistance at 20 °C		Coil length
	mm		mm	mm	mm	Ohm/m	Ohm/m	m
	nom		min	min	min	R4C-	R4D–	nom
R6x--30*	3.00±0.03	6	0.34	0.30	1.37	0.19	1.057	300
R6x--32*	3.20±0.03	6	0.36	0.32	1.46	0.17	0.943	300
R6x--45*	4.50±0.03	6	0.50	0.45	2.06	0.09	0.489	140
R6x--48*	4.80±0.03	6	0.54	0.48	2.19	0.08	0.419	140
R6x--60*	6.00±0.05	6	0.68	0.60	2.74	0.05	0.264	80
R6x--64*	6.40±0.05	6	0.72	0.64	2.92	0.04	0.236	80

Substitute “x” with the required transducer type reference Substitute
*** with required sheath material reference

Transducer Cable Range - Three core C1 configuration cable

Reference	Cable diameter	No of conductors	Conductor diameter	Sheath thickness	Conductors PCD	Nominal conductor resistance at 20 °C		Coil length
	mm		mm	mm	mm	Ohm/m	Ohm/m	m
	nom		min	min	min	R3C-	R3D–	nom
R3x--30-C1*	3.00±0.03	3	0.34	0.30	1.62	0.19	1.057	300
R3x--32-C1*	3.20±0.03	3	0.36	0.32	1.73	0.17	0.943	300
R3x--45-C1*	4.50±0.03	3	0.50	0.45	2.43	0.09	0.489	140
R3x--48-C1*	4.80±0.03	3	0.53	0.48	2.59	0.08	0.419	140
R3x--60-C1*	6.00±0.05	3	0.68	0.60	3.24	0.05	0.264	80
R3x--64-C1*	6.40±0.05	3	0.72	0.64	3.46	0.04	0.236	80

Substitute “x” with the required transducer type reference
Substitute *** with required sheath material reference

Please contact us with your requirements.

Transducer Cable Range - Four core C5 configuration cable

Reference	Cable diameter	No of conductors	Conductor diameter	Sheath thickness	Conductors PCD	Nominal conductor resistance at 20 °C		Coil length
	mm		mm	mm	mm	Ohm/m	Ohm/m	m
	nom		min	min	min	R4C-	R4D–	nom
R4x--30-C5*	3.00±0.03	4	0.34	0.30	1.62	0.19	1.057	300
R4x--32-C5*	3.20±0.03	4	0.36	0.32	1.73	0.17	0.943	300
R4x--45-C5*	4.50±0.03	4	0.50	0.45	2.43	0.09	0.489	140
R4x--48-C5*	4.80±0.03	4	0.53	0.48	2.59	0.08	0.419	140
R4x--60-C5*	6.00±0.05	4	0.68	0.60	3.24	0.05	0.264	80
R4x--64-C5*	6.40±0.05	4	0.72	0.64	3.46	0.04	0.236	80

Substitute “x” with the required transducer type reference Substitute
*** with required sheath material reference

Transducer Cable Range - Six core C6 configuration cable

Reference	Cable diameter	No of conductors	Conductor diameter	Sheath thickness	Conductors PCD	Nominal conductor resistance at 20 °C		Coil length
	mm		mm	mm	mm	Ohm/m	Ohm/m	m
	nom		min	min	min	R6C-	R6D–	nom
R6x--30-C6*	3.00±0.03	6	0.34	0.30	1.62	0.19	1.057	300
R6x--32-C6*	3.20±0.03	6	0.36	0.32	1.73	0.17	0.943	300
R6x--45-C6*	4.50±0.03	6	0.50	0.45	2.43	0.09	0.489	140
R6x--48-C6*	4.80±0.03	6	0.53	0.48	2.59	0.08	0.419	140
R6x--60-C6*	6.00±0.05	6	0.68	0.60	3.24	0.05	0.264	80
R6x--64-C6*	6.40±0.05	6	0.72	0.64	3.46	0.04	0.236	80

Substitute “x” with the required transducer type reference Substitute
*** with required sheath material reference

Please contact us with your requirements.

Thermocouple Probes & RTDs

MI Thermocouple & RTD Range

Operating temperatures

Thermocouple cable sheath material

Transducer cable

Choose one of the following:

No. of conductors – Choose one of the following:

Conductor materials – Choose one of the following thermocouple types:

Conductor configurations:

Insulation material

Conductor Configurations

Thermocouple Junction Types

Main Thermocouple Probe Design Types

With plain pot

With 8 mm ISO seal

With transmitter mounting plate

Ordering information

Thermocouple Probes and Cable Reference

RTD Probe Design Types

Three-wire with solid tails and gland

Four-wire with flexible tail

Ordering information

Tail type

Seal type

Termination fittings

Notes

Resistance Thermometers and Transducer Cable Reference

Thermocouple Tolerance Limits

Thermocouple Cable Metric Range - Two core cable

Thermocouple Cable Metric Range - Four core cable

Thermocouple Cable Metric Range - Six core cable

Transducer Cable Range - Two core cable

Transducer Cable Range - Three core evenly spaced cable

Transducer Cable Range - Four core evenly spaced cable

Transducer Cable Range - Six core evenly spaced cable

Transducer Cable Range - Three core C1 configuration cable

Transducer Cable Range - Four core C5 configuration cable

Transducer Cable Range - Six core C6 configuration cable

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