Ephy-Mess PR-SPA-EX-NWT Manuale utente

Manual

Temperature sensor PR-SPA-EX-NWT

EPHY-MESS GmbH • Berta-Cramer-Ring 1• 65205 Wiesbaden • Germany • phone: +49 6122 9228-0 fax: +49 6122 9228-99 • info@ephy-mess.de

Manual

Temperature sensor PR-SPA-EX-NWT

1. Manufacturer and distributor

EPHY-MESS GmbH phone: +49 6122 9228-0

Berta-Cramer-Ring 1 fax: +49 6122 9228-99

65205 Wiesbaden email: info@ephy-mess.de

Germany

2. Applied standards

DIN EN 60079-0:2012 + A11:2013 (IEC 60079-0:2011, modified + Cor.: 2012 + Cor.: 2013)

DIN EN 60079-7:2015 (IEC 60079-7:2015)

DIN EN 60079-11:2012 (IEC 60079-11:2011 + Cor.:2012)

DIN EN 60079-31:2014 (IEC 60079-31:2013)

3. Labeling

3.1 Equipment protection by increased safety

Labeling according to manual

3.2 Equipment protection by intrinsic safety

Labeling according to manual

4. Assembly

4.1 Installation in the slot of an electrical machine

When installing the temperature sensor in the slot of an electrical machine (e.g. motor, generator or

transformer) no special conditions have to be observed.

The dimensions allow the fixed assembly directly into the slots of the electrical machinery.

The type of construction guarantees a good thermal contact between the monitored components and

the temperature sensor.

The sensors are mounted parallel to the windings directly into the corresponding slots.

High bending loads (flexing) as well as mechanical point loads on the temperature sensor during

installation and operation must be avoided.

During installation one has to pay attention that no damage occurs to cable and insulation.

The supply lines (connecting wires) have to be installed strain-relieved.

II 2D Ex tb IIIC Db

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Manual

The installation of the component is defined in the EC-Type Examination Certificate for the particular

electrical device.

Only mechanically protected sensors can be mounted.

4.2 Usage outside the slot of an electrical machine

At this type of use, wherein the sensor is in direct contact with the explosive atmosphere are the self-

heating and the resultant increase of the surface temperature be observed.

Temperature class

Maximum surface temperature of the

equipment

Ignition temperature of the

flammable materials

450°C

> 450°C

300°C

> 300°C < 450°C

200°C

> 200°C < 300°C

135°C

> 135°C < 200°C

100°C

> 100°C < 135°C

85°C

> 85°C < 100°C

4.3 Self-heating

When measuring the electrical resistance value, the current flows through the temperature sensor.

Depending on the external influences, this causes power dissipation and thus a self-heating of the

temperature sensor. Since a measuring current of 1 mA is generally not exceeded, the power dissipation

of a Pt100 is in the range of a few tenths of a milliwatt and normally does not produce any significant

measuring error. Otherwise, the self-heating must be observed so that the permissible maximum

temperature is not exceeded and measurement errors are avoided.

Sample calculation for the self-heating, which the end user has to consider in his application:

Ohm's law:

1] U = R x I → I = 



[2] P = U x I

[3] P = R x I2

P = electrical power / W

R = sensor resistance / Ω

I = measuring current / A

U = voltage / V

[4] R(t) = R0(1 + A t + B t2)

R(t) = resistance at temperature t / Ω

T = temperature / °C

R0 = nominal resistance at 0 °C / Ω

A = 3.90802E-3 x°C-1

B = -5.802E-7 x °C-2

[5] ∆T = E x P = E x 

= E x R x I²

E = self-heating coefficient, K/mW-1 = 0.4 KmW-1 *

∆T = self-heating

T = permissible surface or ambient temperature

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Manual

R (180°C) = 100 Ω x (1+ 3.90802E-3 x°C-1x180°C+(-5.802E-7 x °C-2 x (180°C)²) = 168.48 Ω

P (180°C) = 168.48 Ωx (0.001 A)² ** = 0.00016848 W → 0.16848 mW

∆T = 0.4 K/mW x 0.16848 mW = 0.067392 K

T= 180°C –0.067392°C = 179.932608°C

P (180°C) = 168.48 Ωx (0.002 A)² *** = 0.00067392 W → 0.67392 mW

∆T = 0.4 K/mW x 0.67392 mW = 0.269568 K

T= 180°C –0.269568°C = 179.730432°C

* This calculation is applicable to one measuring circuit. If several (n) measuring circuits are included in a sensor, k

must be replaced by n x k in the formulae.

** As an example we take 1 mA, because generally a measuring current of 1 mA is not exceeded.

*** Recommended measuring current 2 mA for sensors with bifilar winding.

4.4 Self-heating coefficients

Sensor/Variant

Self-heating coefficients

Pt/Ni/Cuxxxxx

0.4 K/mW

0 K/mW

KTYxx

0.4 K/mW

PTC-NATxxx

Not relevant because

of characteristic curve

4.5 Electrical data

Characteristic values

Gas / Dust

Ex e

Ex i

Max. voltage UI

Chip, Class A

DC 17 V

Chip, Class B

DC 25 V

bifilar wounding

DC 65 V

DC 32 V

Max. current II

Chip, Class A

55 mA

Chip, Class B

80 mA

bifilar wounding

250 mA

65 mA

Max. power PI

Chip, Class A

1 W

Chip, Class B

2 W

bifilar wounding

16 W

2,08 W

Permissible surface/

ambient temperature

Tmax –self-heating

Tmax - self-heating

Capacity CI

negligible

Inductivity LI

negligible

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Manual

For the error analysis acc. to DIN EN 60079-ff. the permissible electrical values must be

considered carefully. The maximum permissible ambient temperatures must be calculated and

ensured under consideration of the self-heating.

The equipment operators must ensure that these values will not be exceeded.

5. Connecting wires

The supply lines of the sensors are color-coded according to the color code and type of circuit related

to the used resistance sensor (see 9.1 circuit and labeling of connecting wires).

The connector ends have to be attached to suitable clamps only.

The sensor supply lines (connecting wires) may only be connected to power supply units suitable and

approved for passive resistance sensors / thermocouples according to the corresponding standards.

The power supply must have a connection adequate to the thermometer’s type of circuit (2-, 3- or 4-

wire-circuit).

The electrical performance data have to be observed (see 6. Technical data)

The sensor signal for the resistance sensor version and the thermistor version has no polarity. The

color code of the supply line is used only for the identification of sensor and circuit!

The sensor signal for the thermocouple version and KTY-sensor version has polarity. For the

thermocouples the plus- and minus pole are color coded according the valid standard. The KTY is

color coded.

The connecting cables must be laid straight and without loops.

It is not allowed to connect, install or apply the PR-SPA-EX-NWT sensor in another way than

described under item 4 and 5.

Constructions with plugs are generally available with Ex i ignition protection. The operating

temperatures and the electrical values of the each plug must be considered.

6. Technical data

Description Temperature sensor PR-SPA-EX-NWT, acc. drawings:

999130613901001 (version 1) 999130613901002 (version 2)

999130613901003 (version 3) 999130613901004 (version 4)

Construction Version PR-SPA-EX-NWT-ST (V1): insulated, bifilar coiled measuring wire

mounted in multiple layers of mica laminate or incorporated into a backfilled

with silicone recording HGW (hard glass fabric) body. Supply line through

soft solder connection and strain relief securely connected.

PR-SPA-EX-NWT-A = PR-SPA-EX-NWT-ST + shielding

Version PR-SPA-EX-NWT-SH (V2): bifilar coiled measuring wire, mounted

pressure-compensated in a flexible HGW (hard glass fabric) carrier body.

Supply line through soft solder connection and strain relief securely

connected.

Version PR-SPA-EX-NWT-AK or PR-SPA-EX-NWT-KS (V3): resistance

sensor inlaid in HGW (hard glass fabric) carrier body or plastic carrier body

(KS), und permanently elastic filled with silicone or epoxy. Supply line with

hard solder or crimp connection securely connected.

Version PR-SPA-EX-NWT-ZS (V4): resistance sensor inlaid in HGW (hard

glass fabric) inter-slide housing (ZS), und permanently elastic filled with

silicone. Supply line with hard solder or crimp connection securely

connected.

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Manual

Approval IBExU 14 ATEX 1281 U

IECEx IBE 14.0058 U

Type of protection II 2G Ex ia IIC Gb / II 2D Ex ia IIIC Db

II 2G Ex eb IIC Gb / II 2D Ex tb IIIC Db

Sensor insulation Version (V1): mica laminate or HGW-carrier body with silicone

Version (V2): HGW-carrier body with insulation hose

Version (V3): HGW-carrier body (AK) with cover or plastic body (KS)

Version (V4): HGW-inter slide housing (ZS) with silicone

Dimensions (TxWxL) Version (V1-V4): T mm x W mm x L mm

Ambient temperature Resistance sensor (Pt/Ni/Cuxxx): -60°C … +180°C

Thermocouple (TE): -60°C … +180°

Silicon-sensor (KTY83): -55°C … +175°C

Silicon-sensor (KTY84): -40°C … +180°C

Thermistor (PTC-NATxxx): -45°C ... +NAT1) + 23 K

Resistance sensor

(Pt/Ni/Cuxxxxx) Material: Platinum (Pt) / Nickel (Ni) / Copper (Cu)

Nominal value: 5 …2000 Ωat [0°C]

Tolerance class: according to respective standard

Measuring circuits: 1 or 2

Mode of connection: 2-, 3- or 4-wire circuit

Measuring current: 0.2 ... 2 mA (bifilar coiled)

0.3 ... 1 mA (chip)

Self-heating: 0.4 K/mW at 0°C

Operating

temperature: -60°C …+180°C

Thermocouples (TE) Measuring circuits: 1 or 2

Max. voltage: 1.5 V

Max. current: 100 mA

Max. power: 25 mW

Self-heating: -

Operating

temperature: -60°C …+180°C

Silicon-sensor (KTY) Model series: KTY83 KTY84

Measuring circuits: 1 or 2 1 or 2

Nominal value: 1000 Ωat 25°C 1000 Ωat 100°C

Measuring current: 1 mA 2 mA

Max. voltage: 5 V 5 V

Max. power: 6.3 mW 6.3 mW

Self-heating: 0.4 K/mW at 0°C 0.4 K/mW at 0°C

Operating

temperature: -55°C …+175°C -40°C …+180°C

Thermistor (PTC) Measuring circuits: 1 or 2

NAT1): 60°C … 180°C

Max. current: 2 mA

Max. voltage: 2.5 V

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Manual

Power: 4.7 mW

Self-heating: not relevant because of characteristic curve

Operating

temperature: -45°C … +180°C

Dielectric strength Sensor: 0.5 kV / 50 Hz, 1min.

Supply line: 0.5 kV / 50 Hz, 1min.

Supply line Construction: single litz, hose line

flat hose line

Insulation: Teflon or silicone

Color code: acc. to DIN or resp. customer’s request

Cross section: ≥ AWG 30

Cable capacitance (Ci): negligible

Cable inductance (Li): negligible

1) NAT= Nominal response temperature

General hints:

When mounting one has to pay attention that no damage will occur to the supply line and the insulation of

the sensor. The supply line must be installed strain-relieved. Extreme bending load as well as punctual,

mechanical stress to the sensor should be avoided.

The special security hints for the mounting regarding the ATEX approval are fixed in the above-named

ATEX-approval which is available at EPHY-MESS or at www.ephy-mess.de.

7. Type identification

PR-SPA-EX-NWT + variant identification (see 8. Variant identification)

SPA

Design

depending on

the point of

installation

Version

see 8. Variant identification

NWT: Slot resistance sensor

EX-certification

Sensor, passive

Product

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8. Variant identification

Version

Customer

standards

(optional)

Measu-

ring

circuits

Sensor

Nominal

value

Tolerance

Wire

circuit

Dimensions

in mm

Supply

line

Sensor

version

(optional)

Addition1)

Screened =abg

Number of isolations

Information about cable

t = thickness

w= width

l= length

2- ,3- or 4-wire circuit for RTD

for TE, KTY, PTC (always 2-wire circuit)

Tolerance class according to DIN:

Class A; B for RTD

Class 1; 2; 3 for TE

In % for KTY, PTC-sensors

100, 500 or 1000 for RTD-Nominal value in [Ω]

J, K … etc. for thermocouple type

83 or 84 for KTY-sensor type

60, 70, 80 … etc. for NAT in [°C]

Pt, Cu or Ni for RTD

TE for thermocouple

KTY for KTY-sensor

EPTC,ZPTC,DPTC for thermistors (single, twin, triple)

"Kombi" for combination of several sensor types

Number of measuring circuits / sensors

Titel of customer standards

AK = carrier component

ST = rigid

ZS = intermediate slider case

SH = shrinking tube insulation

KS =plastic carrier

E. g.: SH,1Pt100B4,3.5x12x200,4000/500A1x20/19,24/7BU/BU/GY/GY,E1GN/YE,abg,2iso,UL

E. g.: ST,SN73264,1Pt100B2,3x10x500,1500/550-A-3.1,IECEx

100

3,5x12x200

4000/500

A1x20/19,24/7

BU/BU/GY/GY

abg,2iso

SN 73264

100

3x10x500

1500/550

3.1,IECex

RTD = Resistance thermometer

NAT = Rated operation temperature

Pt = Platinum

Cu = Copper

Ni = Nickel

1) Addition. E. g.: In KTY also be asked to specify color code and polarity of the line e. g.: YE (+) / GN (-)

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Manual

9. Nominal values / characteristics

Nominal values and characteristics for the individual measuring resistors are specified in the following

standards:

Platinum resistance thermometer DIN EN 60751

Nickel resistance thermometer not standardized

Copper resistance thermometer not standardized

Thermocouples (TE) DIN EN 60584

Thermistors (PTC) DIN 44081-82

Silicon sensors (KTY) not standardized

9.1 Circuit and labeling of connecting wires of Pt100 sensors acc. to EN 60751

2- conductor connection

3- conductor connection

4- conductor connection

1 x Pt100

measuring resistor

2 x Pt100

measuring resistors

9.2 Circuit and labeling of connecting wires of thermocouples acc. standard (excerpt)

Type Color Standard

T BN(BN(+) / WH(-)) EN 60584

J BK(BK(+) / WH(-)) EN 60584

K GN(GN(+) / WH(-)) EN 60584

S OR(OR(+) / WH(-)) EN 60584

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Pt100 measuring resistor

supply unit

9.3 Connection diagram

9.3.1 Connection diagram equipment protection by increased safety

(Principle sketch of thermocouples)

9.3.2 Connection diagram equipment protection by intrinsic safety

(Use of a suitable operating equipment)

Wiesbaden, 23rd of June 2017

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