Slot Resistance Thermometers www.ephy-mess.de

Contents 1. Slot Resistance Thermometer (NWT) bifilar and chip type design 2 1.1 EPHY-MESS NWT delivery program list 2 1.2 Slot resistance thermometer with bifilar winding 3 1.2.1 The rigid mica insulated design (NWT-ST) 3 1.2.2 Slot resistance thermometer in intermediate layer (NWT-ZS) 3 1.2.3 The rigid shielded mica insulated design (NWT-A) 4 1.2.4 The flexible design with insulation consisting of shrinking tube (NWT-SH) 5 1.2.5 Technical data of the bifilar NWT 6 1.3 Chip-type NWT with dot like measuring spot 7 1.3.1 Flexible chip-type NWT located in support structure (M-OK / AK) 7 1.3.2 Flexible...

1. Slot Resistance Thermometer (NWT) Bifilar and chip type design 1.1 EPHY-MESS NWT delivery program list EPHY-MESS NWT delivery program list rigid NWT bifilar measuring flexible NWT bifilar chip type NWT point winding measuring winding measurement NWT-ST rigid, mica insulated standard thermometer with bifilar winding for max. temperatures of 200°C. NWT-SH flexible NWT with bifilar winding insulated with PTFE shrinking tube for maximum temperatures of 180° C. M-OK / AK flexible chip-type NWT contained in silicon HGW casing, insulated with PTFE shrinking tube for maximum temperatures of 180° C....

1.2 Slot resistance thermometer with bifilar winding 1.2.1 The rigid mica insulated design (NWT-ST) The rigid mica insulated models are suitable for use in winding slots of high-voltage engines. ATEX and IECEX-approval for use in hazardous areas with protection type: IECEx: Ex eb IIC ATEX: II 2G Ex eb II Structure A platinum wire with bifilar winding is attached to the carrier body. The connection lines are attached strain relieved. The measuring sensor and the cable outlet are insulated with several layers of fine mica. Fig. 1, NWT-ST Available NWT-ST dimensions thickness dimensions dim. tolerances...

Available NWT-ZS dimensions thickness dimensions width length 2 mm - 5 mm 6 mm - 12 mm 100 mm -500 mm ± 0.2 mm ± 0.2 mm ± 2 mm dim. tolerances special dimensions upon request 1.2.3 The rigid shielded mica insulated design (NWT-A) Structure The structure of the internal thermometer is the same as for the NWT-ST. The copper shielding plate is arranged toward the outside. It is connected to the shielding mesh structure and the ground wire. The shielding of the connecting wire is connected to both ground wires with up to 50 A current. All wires (measuring lines and ground wires) of the standard model...

1.2.4 The flexible design with insulation consisting of shrinking tube (NWT-SH) The flexible NWT is suitable for applications, where a certain flexibility of the thermometer body must be guaranteed during assembly or operation. All flexible NWT manufactured by EPHY-MESS are provided with bifilar winding. ATEX and IECEX-approval for use in hazardous areas with protection type: IECEx: Ex e II ATEX: II 2G Ex e II Structure The platinum wire with bifilar winding is attached to the carrier body. It is contained, relieved from pressure, in an insulating preformed body offering additional insulation...

1.2.5 Technical data of the bifilar NWT NWT-ST operating temperature NWT-ZS NWT-A max. 200° C NWT-SH max. 180° C measuring resistor Pt 100 acc. to DIN EN 60751 measuring winding resistance wire with bifilar winding temperature sensitive length (TEL) thermometer length minus approx. 40 mm bending radius rigid wires Teflon -Insulation color according to DIN AWG20 -AWG28, as requested by customer earth circuit max. current intensity 50 A not applicable insulation (sensor) fine mica, multiple layers dielectric strength (sensor and wire) thermometer length minus approx. 105 mm not applicable same...

1.3 Chip-type NWT with dot like measuring spot 1.3.1 Flexible chip-type NWT located in support structure (M-OK / AK) Flexible chip-type NWT located in a support structure are designed for control applications, where a punctual measurement (TSL = 2 mm) and a flexible type of NWT are required. The chip-type NWT of the M-OK / AK design is approved for use within the ranges of increased safety. Structure The measuring resistor is, relieved from pressure, contained in an insulating preformed silicon body. Using a casting compound and cover having permanent flexibility provides for an additional insulation....

1.3.3 Rigid chip-type NWT located in Zwischenschieber (M-OK / ZS) The rigid chip-type NWT sensors located in an epoxy glass laminate Zwischenschieber represent a further element of the chip-type NWT delivery program. They form the counterpart of the bifilar-type NWT-ST sensors. IECEX and ATEX-approval for use in hazardous areas with protection type: IECEx: Ex eb IIC ATEX: II 2G Ex eb II Structure The measuring resistor is contained in and cast into a glass laminate Zwischenschieber. Due to the excellent electrical properties of the HGW and the casting compound this sensor has an extremely high...

1.3.5 Standard dimensions and circuitry methods of the chip-type NWT-sensors 1) dimensions T× W× L 2) M-OK / AK 2-line 3-line M-OK / KS 4-line M-OK / ZS 3-line 4-line × 2× 8× 50 mm 2-line × 2-line 3-line × 3) × × 3) 3× 8× 50 mm 3 × 8 × 100 mm 2× 8× 63 mm × × 3) × × 3) × × × × × × × × × × × × × × × 3) × 2× 10 × 60 mm 2× 10 × 65 mm 4-line × × 2 × 8 × 100 mm 1) 3) × 2 × 10 × 100 mm 1) 2) 3) special dimensions upon request manufacture of sensors with special dimensions not possible dimensions with reduced kV-strength REV201205052 EPHY-MESS Slot Resistance Thermometer 9