TEMPERATURE SENSORS FOR EXPLOSIVE ENVIRONMENTS

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Resistance temperature sensors are designed for contact temperature measurement of liquid and gaseous substances. They operate on the principle of dependency of the change of resistance of the sensor and the change of temperature. Resistance temperature sensors are not able to create sparks, electric arcs or high surface temperatures and the maximum permitted DC input power for the sensor is 2mW. The standard temperature range for using of the sensor in ZONE 2 is – 30 to 80 °C, which corresponds to temperature class T6, and it must not be exceeded even for a brief period in areas with the risk of explosion. By combining it with a centre holder or thermowell supplied as accessories, the sensor can be used for measuring temperature in air conditioning ducts and pipes.

The sensors are designed to be operated in a chemically non-aggressive environment, the use must be chosen with regard to temperature resistance of the head and chemical resistance of the case and head of the sensor.

ACCESSORIES

metal central holder K120 - for use un air-conditioning ducts
metal holder K 110C - for mounting to a wall
stainless steel thermowell JS 130
Screw with collet or cutting rings – if different lengths of stem immersion of the temperature sensor are set

DECLARATION, CERTIFICATION, CALIBRATION

Manufacturer provides EU Declaration of Conformity.
Calibration – The final metrological inspection – comparison with standards or working instruments – is carried out for all the products. Continuity of the standards and working measuring instruments is ensured within the meaning of the Section 5 of Act no.505/1990 on metrology. The manufacturer offers a possibility to supply the sensors calibrated in SENSIT s.r.o.’s laboratory (according to requirements of the EN ISO/IEC 17025 standard) or in an Accredited laboratory.

Technické parametry

Sensor type	NK 120EX	NK 121EX	NK 122EX	NK 320EX	NK 321EX
Type of sensing element	Ni 1000/5000	Ni 1000/6180	Ni 891	Ni 10000/5000	Ni 10000/6180
Measuring range in ZONE 2	-30 to 80 °C
Max. DC measuring current	1 mA	1 mA	1 mA	0.3 mA	0.3 mA

Sensor type	NK 123EX	PTK 120EX	PTK 220EX	PTK 320EX	HK 120EX
Type of sensing element	T1 = Ni 2226	Pt 100/3850	Pt 500/3850	Pt 1000/3850	termistor NTC 20 kΩ
Measuring range in ZONE 2	-30 to 80 °C
Max. DC measuring current	0.7 mA	3 mA	1.5 mA	1 mA	1 mW *)

*) maximum power consumption

OTHER PARAMETERS
Measuring range	in ZONE 2: -30 °C≤ Ta ≤ 80 °C
Sensing element connection	2wire, 3wire, 4wire
Recommended power supply	from a PELV or SELV source maximum input power 2mW
Time response	in accordance with EN 60751 (in flowing water > 0,2 m/s), - for case diameter 4 mm: τ0,5 ≤ 4 s, τ0,9 ≤ 10 s - for case diameter 6 mm: τ0,5 ≤ 9 s, τ0,9 ≤ 20 s - for case diameter 8 mm: τ0,5 ≤ 14 s, τ0,9 ≤ 35 s - for case diameter 10 mm: τ0,5 ≤ 25 s, τ0,9 ≤ 60 s
Insulation resistance	> 200 MΩ at 500 V DC, 25 ± 3°C and relative humidity < 80 %
Electric strength	1000 V DC for 1s, 25 ± 5°C, humidity < 80 %
Ingress protection	IP 66 in accordance with EN 60529
Terminal board type	ceramic, recommended cross-section of the wires 0.5 to 1.0 mm²
Material of the connection head	aluminum
Dimension of the connection head	83 x 83 mm
Temperature resistence of the head	-30 to 90 °C
Material of the stem	stainless steel DIN 1.4301, 1.4404 or 1.4571
Diameter of the stem D	4 mm, 6 mm, 8 mm, 10 mm
Standard length of stem L	diameter 4 mm: 70, 120, 180, 240 mm other diameter: 50, 70, 120, 180, 240, 300, 360 a 420 mm
Wire resistance	0.254 Ω / m (two-wire connection)
Maximum operating pressure	with stem diameter 4 mm 2,5 MPa with stem diameter 6 to 10 mm 6,3 MPa
Weight	min 0.4 kg

Note: Manufacturer reserves the right to make changes in design and technical characteristics of the products. For actual information, please always contact your dealer.