RESIOPAK®Mineral Insulated Resistance Thermometer Sensor

RESIOPAK is a trademark of our metal sheathed resistance thermometer sensor and consists of a stainless steel thin tube (sheath), a conducting wire, the element of the resistance thermometer sensor inside the tube, and an inorganic insulator (MgO) firmly packed and insulated around them. We can manufacture sensors in variations based on this structure according to the purposes of use. RESIOPAK has many excellent features in comparison to the general type (protection tube type) of the resistance thermometer sensors.

RESIOPAK Sheathed Resistance Thermometer Sensors imgae

Principle of Platinum Resistance Thermometer Sensors

Generally, the electrical resistance of metal changes with the temperature. Especially, the electrical resistance of platinum linearly changes with temperature, and its temperature coefficient is large; therefore, platinum is suitable for temperature measurement. In addition, platinum has excellent characteristics chemically and physically and it is easy to get platinum of industry high purity; therefore, we can use platinum as a resistance element for long term stable temperature measurement. The characteristics have been standardized in JIS and other overseas standards; therefore, temperature measurement with a high accuracy is available.

Features

RESIOPAK has the following features in comparison to conventional resistance thermometer sensors.

  • 1.Wider Application Range

    Since the outer diameter is small, you can measure the temperature of small targets for a wide temperature range of -200 to +500℃.

  • 2.High Response

    Since the tube is thin and the heat capacity is small, RESIOPAK is sensitive to minor temperature changes and responds quickly.

  • 3.Easier Handling

    Since the bending processing is easy (the minimum bend radius is two times longer than the sheath outer diameter), you can easily install the sensor at sites in places with many bends. (However, the tip of 70 mm is excluded)

  • 4.Longer Product Life

    Since the RESIOPAK sheathed resistance thermometer sensor’s conducting wire and resistance element are insulated and sealed with chemically stable magnesium oxide, the product life is longer than conventional resistance thermometer sensors for aging change, disconnection, etc.

  • 5.Excellent Mechanical Strength/Vibration Resistance

    The sensor can be used even under the conditions of a place with vibration, corrosive atmosphere, etc.

  • 6.Sheath Outer Diameter Manufacturing Available

    We can manufacture a sheath outer diameter φ0.8 to φ12.75 mm. Up to φ1.0 mm is available for the minimum temperature sensing part outer diameter.

  • 7.Sheath Length Manufacturing Available

    We can manufacture up to 300 m depending on the sheath outer diameter.

  • 8.Special Needs Handling

    Since the sheath outer diameter is small and bending processing is easy, the sensor can be installed in a small space without disturbing the flow of the target to be measured. We have many types of sheath outer diameter and can also manufacture a single sheath with two elements (six conducting wires). We handle a wide range of needs with various outer diameters.

Structure of Resistance Element

Winding Resistance Element

An extremely fine platinum resistance wire coil is inserted into an alumina insulator and both ends are sealed.

Winding Resistance Element image

Thin Film Resistance Element

Platinum is deposited onto an alumina substrate to form a circuit and the upper part of the circuit is insulated with glass.

Thin Film Resistance Element image

Type of Resistance Thermometer Sensor

Nominal resistance value at 0℃ Class Measured current R100/R0 (Resistance ratio)
Pt100Ω(JPt100Ω) AA 2mA,1mA,0.5mA 1.3851(1.3916)
A
B
C

Remarks

  • R100 is the resistance value of the resistance element at 100℃.
  • R0 is the resistance value of the resistance element at 0℃.
  • JPt 100 has been abolished.

Sheathed Resistance Thermometer Sensor Standard Specification

Sheath

Conducting wire

Sheath max. length (m) Approx. weight (g/m)
O.D. Outer diameter
(mm)
t Thickness
(mm)
Material Core wire diameter
(mm)
Resistance per wire
(Ω/m)
Material
Single element image

Single element

Φ1.6

10% or more of

sheath outer diameter

316SS

10% or more of

sheath outer diameter

6.34Max. Nickel 100 10
Φ3.2 1.59Max. 83 45
Φ4.8
0.71Max. 35 100
Φ6.4
0.40Max. 20 180
Φ8.0
0.25Max. 11.5 280
Φ9.0 0.20Max. 21 370
Φ12.75 0.10Max. 10.5 660
Double element image

Double element

Φ3.2

10% or more of

sheath outer diameter

316SS

10% or more of

sheath outer diameter

1.59Max. 83 45
Φ4.8 0.71Max. 35 100
Φ6.4 0.40Max. 20 180
Φ8.0 0.25Max. 11.5 280
Φ9.0 0.20Max. 21 370
Φ12.75 0.10Max. 10.5 660
Single 4-conducting wire image

Single 4-conducting wire

Φ0.8

10% or more of

sheath outer diameter

316SS

10% or more of

sheath outer diameter

25.37Max.
Φ3.2 1.59Max. 83 45
Φ4.8 0.71Max. 35 100
Φ6.4 0.40Max. 20 180
Φ8.0 0.25Max. 11.5 280
Φ4.8 0.14Max. Copper 35 370

We can manufacture sensors with sheath diameters and materials other than the above.

List of Allowance for Temperature and Standards Applied by Each Country

Basic standard
Nominal resistance
Class Allowance(℃) JIS C1604/IEC 60751 ASTM E1137
Winding element Thin film element
Temperature range(℃)
Pt100Ω at 0℃
(R100/R0=1.3851)
AA ±〔0.1+0.0017|t|〕 -196 to 450 0 to 150
A ±〔0.15+0.002|t|〕 -196 to 450 -30 to 300
±〔0.13+0.0017|t|〕 -200 to 650
B ±〔0.3+0.005|t|〕 -196 to 500 -50 to 500
±〔0.25+0.0042|t|〕 -200 to 650
C ±〔0.63+0.01|t|〕 -196 to 500 -50 to 600

Remarks

  • The allowance is the allowable error maximum limit of the resistance value indicated by the resistance element converted with the standard resistance value table subtracting the measured temperature |t|.
  • |t| is the measured temperature which is indicated with the temperature (℃) unrelated to + and - signs.
  • The latest version is applied for the standard year.

Resistance Thermometer Sensor Connection Method and Color Indication

JIS type/IEC type

JIS type/IEC type image

ASTM type

ASTM type image

※ASTM standard has no double element requirements. For double elements, IEC standard is applied.

  • 2-conducting wire type:

    Since the conducting wire resistance value is added to the resistance value, the conducting wire resistance must be decreased or must be known in advance. This type is rarely used except for the case of a relatively high resistance.

  • 3-conducting wire type:

    Since the variation of three conducting wires resistance affects the accuracy, you must pay attention in the case of long distance transmission. This type is generally used in many cases.

  • 4-conducting wire type:

    Since the conducting wire resistance does not affect the accuracy, this type is used for measurement with high accuracy. Generally the constant current is sent and the resistance value is measured with the potential difference.

Use Temperature Range

Symbol Category Use temperature range(℃)
L For low temperature -196 to +100
N For normal temperature -30 to +200
M For medium temperature 0 to 350
H For high temperature 0 to 500

Basic Model

R35: Sheath Resistance Thermometer Sensor with Extension Lead Wire

Most basic model suitable for indoor usage.

R35: Sheath Resistance Thermometer Sensor with Extension Lead Wire image

T110/R110: Temperature Sensor with a Push-pull Connector

Adopting the latching system greatly shortens time and the sensor shows true value in all fields with its robustness, lightness and safety.

T110/R110: Temperature Sensor with a Push-pull Connector image

R96N: Outdoor Type Sheath Resistance Thermometer Sensor

This type has a drip-proof type terminal box, suitable for usage in an outdoor general environment.

R96N: Outdoor Type Sheath Resistance Thermometer Sensor image

R97N: Pressure Resistant Explosion-proof Type Sheath Resistance Thermometer Sensor

This type is suitable for usage in dangerous places where explosive gas may occur such as petroleum refining/petrochemical plants. It is designed according to the structure standard d2G4.

R97N: Pressure Resistant Explosion-proof Type Sheath Resistance Thermometer Sensor image

R99N: Hydrogen Explosion-proof/Pressure Resistant Explosion-proof Type Sheath Resistance Thermometer Sensor

This type is suitable for usage in dangerous places where explosive gas especially that which includes hydrogen may occur such as petroleum refining/petrochemical plants. It is designed according to the technical standard ExdIICT6.
For overseas, we have products which support ATEX (CE Marking), FM (U.S.A.), FMC (Canada), NEPSI (China), KOSHA (Korea), TR CU (Russia, Kazakhstan and Belorussian), PESO (India), and OSHA (Taiwan) explosion-proof.
Only for usage within Japan, a pressure-proof packing type connector must be attached.

R99N: Hydrogen Explosion-proof/Pressure Resistant Explosion-proof Type Sheath Resistance Thermometer Sensor image

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