Ephy-Mess PR-SPA-EX-NWT User manual

Manual
Temperature sensor PR-SPA-EX-NWT

EPHY-MESS GmbH • Berta-Cramer-Ring 1• 65205 Wiesbaden • Germany • phone: [phone] fax: [phone] • [e-mail]
Manual
Temperature sensor PR-SPA-EX-NWT
1. Manufacturer and distributor
EPHY-MESS GmbH phone: [phone]
Berta-Cramer-Ring 1 fax: [phone]
65205 Wiesbaden email: [e-mail]
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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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
T1
450°C
> 450°C
T2
300°C
> 300°C < 450°C
T3
200°C
> 200°C < 300°C
T4
135°C
> 135°C < 200°C
T5
100°C
> 100°C < 135°C
T6
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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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
TE
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
DC 17 V
Chip, Class B
DC 25 V
DC 25 V
bifilar wounding
DC 65 V
DC 32 V
Max. current II
Chip, Class A
55 mA
55 mA
Chip, Class B
80 mA
80 mA
bifilar wounding
250 mA
65 mA
Max. power PI
Chip, Class A
1 W
1 W
Chip, Class B
2 W
2 W
bifilar wounding
16 W
2,08 W
Permissible surface/
ambient temperature
Tmax –self-heating
Tmax - self-heating
Capacity CI
negligible
negligible
Inductivity LI
negligible
negligible

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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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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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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)
PR
SPA
EX
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
SH
1
Pt
100
B
4
3,5x12x200
4000/500
A1x20/19,24/7
BU/BU/GY/GY
abg,2iso
UL
ST
SN 73264
1
Pt
100
B
2
3x10x500
1500/550
A
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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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