PTC - carbonbrushsolution.com · Carbex A • ox 115 • 52 22 Vadstena • Sweden • Tel 46...

Carbex AB • Box 115 • 592 22 Vadstena • Sweden • Tel +46 (0)143-294 40 • [email protected] • www.carbex.se 1/7

PRODUCT INFORMATION

PTCPTC resistors or thermistors are semi-conductor resistors with temperature sensitivity. The component’s rapid and characteristic resistanceincrease with increase in temperature renders it ideal for temperature monitoring and as an overheating protection in electric motors, generators, transformers, etc.

• Can be ordered for temperatures from +60°C to +180°C in accordance with DIN44081 and DIN44082 (manufactured up to +210°C but outside these norms’ temperature intervals)• Available in single and triple versions as stock items (applies to the most common temperatures)• Adapted for compatibility with the most common thermistor relays on the market which comply with DIN VDE 0660

Properties• Very high repetitive accuracy • Very long service life with hysteresis-free operation • Low cost relative to other monitoring devices • Small dimensions/low weight (extremely small variants available as alternatives)• Quick response time• Good linearity of the temperature/resistance characteristic curve• A very sharp resistance increase when monitoringtemperature permits simple monitoring of electronicdevices and systems

Description/FunctionThe PTC thermistor is a temperature-dependent compo-nent. Its stated ”transition temperature” or ROT (Rated Ope-ration Temperature) is consistent with the Curie point of ceramic materials. Resistance increases very sharply with a relatively small increase in temperature at ROT. This sharp increase is used to trigger a switching function in connected monitoring electronic devices. See technical data.

PTC resistors or thermistors are semi-conductor resistors with temperature sensitivity. The component’s rapid and characteristic resistance increase with increase in temperature renders it ideal as a temperature monitor/overheating protection in electrical plant and equipment.

Typical applicationsThe most typical application areas for temperature monitoring and overheating protection are electric motors,generators and transformers. PTC resistors mounted in specially-adapted and customized devices and installations allow the component to be used in most applications where a corresponding monitoring/overheating protection is sought after.

VersionsWe stock single and triple PTC resistors for mountingin windings (see item list). The compact format allowsthe resistor to be mounted mechanically in a variety of designs ranging from standard versions to unique project executions.

Examples of variants• Minimal size heat shrink tubing for mounting in windings, etc. • Threaded version for installation in motor bearings, etc. • Mounted in ring cable shoes for screw attachment to the heat sink, etc.• Mounted in metal tubing (steel, brass, ceramic) for plug-in installation and temperature measurement of bearing housings, etc.

Product information for which Carbex bears no responsibility is provided by the manufacturer.


PTC


(direct extract from the manufacturer’s data sheet in English)

REISSMANN Sensortechnik GmbH · Westring 10 (under the water tower) · D-74538 Rosengarten-Uttenhofen Telephone 49 (0)791 950 15-0 · Telefax +49 (0)791 950 15-29 · E-Mail [email protected] · Internet http://www.reissmann.com

Product Information Motor and machine protection

Temperature monitoring with PTC-thermistors

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- PTC-sensors examples of PTC-thermistor-housings

shrink tube housing,

e.g. for monitoring windings

screw-in-sensors in alu housing: AL-M3/SW8 and AL-M4/SW10




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Example models:

PTC-model dimensions: other design and change of length of leads (L4) according to customer‘s requirements L1 [mm] L2 [mm] / colour L3 [mm] L4 [mm] Ømax. [mm] ØL [mm] (according to choice of producer)

standard 15 180 / black 10 520 3,5 0,42 / 0,54 mini 11 180 / yellow 10 520 2,5 0,42 / 0,54 Electric motor- and machine protection PTC-thermistors for measurements and control 30V to DIN 44081 und DIN 44082 Single-PTC Twin-PTC Triple-PTC PTC-screw-in sensor PTC-surface sensor Thermistor Thermistor Thermistor




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Example models:

PTC-model dimensions: other design and change of length of leads (L4) according to customer‘s requirements L1 [mm] L2 [mm] / colour L3 [mm] L4 [mm] Ømax. [mm] ØL [mm] (according to choice of producer)

standard 15 180 / black 10 520 3,5 0,42 / 0,54 mini 11 180 / yellow 10 520 2,5 0,42 / 0,54 Electric motor- and machine protection PTC-thermistors for measurements and control 30V to DIN 44081 und DIN 44082 Single-PTC Twin-PTC Triple-PTC PTC-screw-in sensor PTC-surface sensor Thermistor Thermistor Thermistor



PTC




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PTC




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PTC-thermistor in stainless steel housing

PTC-thermistor in ceramics or brass housing

PTC-thermistor in cable shoe surface sensor

Responsibility: No responsibility will be accepted for thermistors which have not been installed and tested according to the relevant standards as previously listed in our data sheet. Due to the ongoing research and development program, product specification may be subject to change, at the manufacturers discretion. For further advice and information contact:




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PTC-thermistor in ceramicsor brass housing




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PTC

Packaging• Stock items as are usually sold individually (see item list)• Special executions, versions for non-standard temperatures, request MOQ

Technical data• Minimal size heat shrink tubing for mounting in windings, etc. • Threaded version for installation in motor bearings, etc. • Mounted in ring cable shoes for screw attachment to the heat sink, etc.• Mounted in metal tubing (steel, brass, ceramic) for plug-in installation and temperature measurement of bearing




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- Technical base data Typical resistance-temperature characteristic The advantage of PTC-thermistors is demonstrated by the very steep curve as shown in the graph. This graph shows the relationship between temperature and resistance. The characteristic of the curve demonstrates the accuracy of the PTC‘s. The increase in the resistance from the switching point onwards is exponential. The DIN-standards relevant to these products cover the temperature range from +60°C to +180°C and are DIN 44081 and 44082. Resistance values (according to DIN 44081 and DIN 44082) The resistance temperature characteristic of PTC- thermistors for the thermic protection of machines is defined by the following formula: Temperature Range (TKL)

PTC-Resistance (RKL)

Measuring DC voltage U (test voltage)

-20°C to TROT -20K RKL < 250 Ω U < 2,5 V

at TROT -5K RKL < 550 Ω U < 2,5 V

at TROT +5K RKL > 1330 Ω U < 2,5 V at TROT +15K RKL > 4000 Ω U < 7,5 V

Load must not be applied to the thermistors as this creates a self-heating effect. At ambient temperature the resistance value of thermistors is normally between 50 Ω and 100 Ω. It can also be between 30 and 250 Ω. At ambient temperature the resistance values have no relevance to the serviceability (functionality) at the ROT (rated operating temperature). The ROT of PTC-thermistors in the range of +60°C to +180°C progresses normally in steps of 10 K.




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Mechanical and electrical qualities insulation class The insulation class of machines suitable for protection with PTC‘s is graded according to

VDE 0530 and this is demonstrated in the table below.

Insulating

material class Y A E B F H C

classified

temperature limit +90°C +105°C +120°C +130°C +155°C +180°C over +180°C

insulation test Before testing the leads of the sensors have to be connected electroconductively. The testing voltage is connected to the leads and the motor winding according to DIN 44081 and DIN VDE 0530.

resistance test of the installed thermistors

Because of the self-heating effect a method to measure PTC-thermistors must be used in which the voltage drop per sensor is not greater than 2,5V DC. The measurement is to be done with a measuring bridge, e.g. Wheatstone. A reading of ≤ 250 Ω per sensor indicates that the sensors and leads are correctly installed. When more than 1 sensor is wired in series the allowable resistance is in multiples of ≤ 250 Ω.

installation instruc- tions for electric motors

It is important that the sensors are inserted in the stator coils, nearest to the rotor before impregnating the windings. The sensors should be tested prior to the impregnation of the rotor, winding temperatures must not exceed 175°C for sensors with ROT 160°C or 185°C for sensors with ROT 170°C. If impregnating agents or impregnating varnishes are used, that are not chemically neutral, the resistivity of the sensors has to be tested by the user. The sensor must be inserted in the middle of the end coils, ensuring that they are completely surrounded by the windings. Hollow space and trapped air influence the heat transmission. One sensor must be inserted into each leg of the windings with the leads parallel to the coil conductors. The mounting of several sensors has to be done in series. The leads must be connected to a terminal block on the terminal board, to ensure that they are separate from the winding terminals. Tension and other mechanical stresses must be avoided when installing sensors. Please avoid loops in the leads to avoid possibly occurring interfering voltage.

Quality control

Unless requested otherwise, quality control is to DIN 40080, AQL (acceptable quality level) in accordance with MIL-standard 105D and IEC 410 at the discretion of the manufacturer. Precise manufacturing and testing techniques guarantee the accuracy of REISSMANN-PTC-thermistors. All manufacturing operations are designed to conform to DIN 44081 + 44082. Special versions (e.g. longer leads) are quickly available on request.

Caution: The lead ends of the PTC-thermistors must not be connected to a voltage larger than 2,5 V DC! We recommend that a warning label be fixed to any apparatus where there is a possibility of more than 2,5 V DC being connected to the sensor. These warning labels may be purchased from REISSMANN when required.



PTCTechnical data PTC

(ROT = Rated Operation Temperature)Technical data standard items Mechanical Value/ Description UnitDiameter PTC-‐pellet ca 2t 2.5 mmHeat shrink tube Kynar length ca 11 mmWiring standard (multi-stranded silver-plated copper with insul. PTFE) 26 AWGWiring alternative (special) (multi-stranded silver-plated copper with insul. PTFE) 24 AWGWire length standard (connection wire) 500 mmWire length standard between PTC pellets (double/triple) 200 mmEnd seal connection wire Semi-‐stripped -‐ThermalTemperature ROT acc. DIN 44081 and DIN 44082 (in steps of 10°C) 60 -‐ 180 °CTemperature ROT acc. DIN 44081 and DIN 44082 145. 155 °CColour coded connection wires* 44081. 44082 DINTemperature ROT outside DIN norms 190 -‐ 210 UL 94Temperature tolerance for ROT = 60 -- 160°C +/-‐ 5 °CTemperature tolerance for ROT = 70 -- 180°C +/-‐ 7 °CTime for switch over < 3 sStorage temperature -‐25 -‐ +65 °CElectricalInsulation (dielectric strength) 2.5 kVac eff.Max working voltage 25 VMax measuring voltage (for resistance check) 2.5 VResistance PTC at room temp. (x number series connected PTCs) (for correct measurement values with bridge sensor, for example Wheatstone), take into account max measuring voltage across each PTC (Resistance can be as low as 30Ω)

250 Ω (max)

Resistance per PTC from -20°C to ROT --20°C 250 Ω (max)Resistance per PTC at ROT --5°C (take into account temp. tolerance) 550 Ω (max)Resistance per PTC at ROT +5°C (take into account temp. tolerance) 1330 Ω (min)Resistance per PTC at ROT +15°C (take into account temp. tolerance) 4000 Ω (min)Resistance wiring ca (AWG26) at +20°C 133 Ω/kmResistance wiring ca (AWG24) at +20°C 82.7 Ω/km

*Colour code connection wires acc. to DIN 44081 and DIN 44082

Temperature °C Colour Colour60 White Grey70 White Brown80 White White90 Green Green

100 Red Red110 Brown Brown120 Grey Grey130 Blue Blue140 White Blue145 White Black150 Black Black155 Blue Black160 Blue Red170 White Green180 Black Grey

*Colours for connecting wires for temperatures 190 -- 210°C not standardized.



PTC

Itemnumber Designation Colourcodewires Switch-overtemp Insulation(kV) Instock(ROT)°C ConnectionbetweenPTC (normal)

Singlevariant100400080 TermistorSingleEKL080 white/white 80 500 - 2.5100400100 TermistorSingleEKL100 red/red 100 500 - 2.5 X100400110 TermistorSingleEKL110 brown/brown 110 500 - 2.5 X100400120 TermistorSingleEKL120 grey/grey 120 500 - 2.5 X100400130 TermistorSingleEKL130 blue/blue 130 500 - 2.5 X100400140 TermistorSingleEKL140 white/blue 140 500 - 2.5 X100400145 TermistorSingleEKL145 white/black 145 500 - 2.5 X100400150 TermistorSingleEKL150 black/black 150 500 - 2.5 X100400155 TermistorSingleEKL155 blue/black 155 500 - 2.5 X100400160 TermistorSingleEKL160 blue/red 160 500 - 2.5 X100400170 TermistorSingleEKL170 white/green 170 500 - 2.5 X100400180 TermistorSingleEKL180 white/red 180 500 - 2.5 X100400190 TermistorSingleEKL190 black/grey*orblack/brown* 190 500 - 2.5 X

Triplevariant100410070 TermistorTripleDKL070 vit/brun 70 500 200 2.5 X100410080 TermistorTripleDKL080 white/white 80 500 200 2.5 X100410090 TermistorTripleDKL090 green/green 90 500 200 2.5 X100410100 TermistorTripleDKL100 red/red 100 500 200 2.5 X100410110 TermistorTripleDKL110 brown/brown 110 500 200 2.5 X100410120 TermistorTripleDKL120 grey/grey 120 500 200 2.5 X100410130 TermistorTripleDKL130 blue/blue 130 500 200 2.5 X100400026 TermistorTriple130stand. blue/blue 130 600 400 2.5 X100400028 TermistorTriple130stand. blue/blue 130 2200 400 2.5 X100410140 TermistorTripleDKL140 white/blue 140 500 200 2.5 X100410145 TermistorTripleDKL145 white/black 145 500 200 2.5 X100410150 TermistorTripleDKL150 black/black 150 500 200 2.5 X100410155 TermistorTripleDKL155 blue/black 155 500 200 2.5 X100400027 TermistorTriple155stand. blue/black 155 300 100 2.5 X100410160 TermistorTripleDKL160 blue/red 160 500 200 2.5 X100410170 TermistorTripleDKL170 white/green 170 600 400 2.5 X100410180 TermistorTripleDKL180 white/red 180 500 200 2.5 X100419180 TermistorTripleDKL180 white/red 180 600 400 2.5 X100410190 TermistorTripleDKL190 black/brown* 190 600 400 2.5

*Colourcodenotstandardized

Wirelength(camm)

PTC - carbonbrushsolution.com · Carbex A • ox 115 • 52 22 Vadstena • Sweden • Tel 46...

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