Ignition Protection Category, Type
Measurement probe with HygroClip: For Zone 0/20
Transmitter: Complete transmitter for Zone 1/2 and 21/22
The following ATEX approval according to IEC is fulfilled:
Device group II for explosive atmospheres (not mining)
Probe: For application temperature Tamb = [-40 … +60 °C]
II 1/2 G Ex ia IIC T5 Ga/Gb Zone 0, gas, intrinsically safe, temp. 100°C
II 1/2 D Ex ia IIIC T80°C Da/Db Zone 20, dust, intrinsically safe, temp. 80°C
IP66 IP protection 66
Or
For application temperature Tamb = [-40 … +85 °C]
II 1/2 G Ex ia IIC T4 Ga/Gb Zone 0, gas, intrinsically safe, temp. 130°C
II 1/2 D Ex ia IIIC T110°C Da/Db Zone 20, dust, intrinsically safe, temp. 110 °C
IP66 IP protection 66
(1/2 - 1: Zone 0 and 2: Zone 1 suitable for mounting in zone separation wall)
(Ga - very high protection level (Zone 0), Gb - high protection level (Zone 1))
(Da - very high protection level (Zone 0), Db - high protection level (Zone 1))
(Ga/Gb, Da/Db suitable for mounting in zone separation wall)
Transmitter: For application tempearture Tamb = [-40 … +60 °C] (without LCD) and
For application temperature Tamb = [-10 … +60 °C] (with LCD)
II 2(1) G Ex eb mb [ia Ga] IIC T5 Gb Zone 1, 2, gas, (intrinsically safe), temp. 100°C
II 2(1) D Ex tb [ia Ga] IIIC T80°C Db Zone 21, 22, dust, (intrinsically safe), temp.80°C
IP66 IP protection 66
(2(1) - 2: Zone 1, (1): contains electric circuits that may exist in Zone 0)
(Ex e mb [ia Ga] multiple ignition protection categories: Ex-e, Ex-mb and output Ex-ia)
Complete system: II 1/2 G Ex eb ia mb IIC T5 Ga/Gb
II 1/2 D Ex ia tb IIIC T80°C Da/Db
ATEX-Relevant Standards
The following European standards are relevant for the product:
CENELEC - European Committee for Electrotechnical Standardization
EN 60079–0 Part 0: Equipment – General requirements Construction, testing, marking
EN 60079–7 Part 7: Equipment protection by increased safety “e”
EN 60079–11 Part 11: Equipment protection by intrinsic safety “i”
EN 60079–14 Part 14: Electrical installations design, selection and erection
EN 60079–18 Part 18: Equipment protection by encapsulation “m”
EN 60079–26 Part 26: Equipment with equipment protection level (EPL) Ga Zone 0 requirements (EPL - Equipment protection level)
EN 60079–31 Part 31: Equipment dust ignition protection by enclosure “t”
Nominal Data
Power supply:
There are two separate connections available for the humidity and temperature sensors. The device connections comprise power supply and sensor signal. The supply voltages for the two sensors may be different because they are isolated by two internal diodes. The device can also be operated with only one loop.
Device input voltage: USupply = 20 V … 28 VDC [24 V +/- 15%]
Maximum current: ISupply max. = 50 mA [Sum of both input currents]
Load impedance: RM = 0…500 Ω [Measurement voltages 0 V…10 V]
Ambient temperature range:
•Measurement probe: TA = [- 40 °C ... + 85 °C]
•Transmitter with LCD: TA = [- 10 °C … + 60 °C]
•Transmitter without LCD: TA = [- 40 °C … + 60 °C]
The normal ATEX standards only apply for normal temperatures [-20 °C … +40 °C] and for a pressure range of [0.8 bar…1.1 bar]. The extended temperature range must be marked on the product identification label.
Input protection circuit:
The device is protected against polarity reversal by two diodes. In addition to this, two Z-Transil
diodes protect against static and transient overvoltages. These measures are not required by ATEX.
They were, however, implemented as easily realizable additional protective measures.
Um = 28 V DC Supply circuit sensor* |
HC2-LDPxxx-EX Sensor circuit* |
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Maximum output voltage: |
Uo ≤ 6.6 V |
Maximum input voltage: |
Ui ≤ 6.6 V |
Maximum output current: |
Io ≤ 82 mA |
Maximum input current: |
Ii ≤ 82 mA |
Maximum output power: |
Po ≤ 485 mW |
Maximum input power: |
Pi ≤ 485 mW |
Capacity: |
Co = 22 μF |
Interne Kapazität: |
Ci = 19 μF |
Inductance: |
Lo = 2 μH |
Internal inductance: |
Li = 0 |
All other sensors Sensor circuit* |
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Maximum input voltage: |
Ui ≤ 6.6 V |
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Maximum input current: |
Ii ≤ 82 mA |
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Maximum input power: |
Pi ≤ 485 mW |
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Internal capacity: |
Ci = 15 μF |
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Internal inductance: |
Li = 0 |
* Type of protection intrinsic safety Ex ia IIC. |
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Product Identification Label
Manufacturer: Rotronic AG, CH-8303 Bassersdorf
Type designation: HF520-EX
Serial number: < Number >
Measurement probe: II 1/2 G Ex ia IIC T5…T4 Ga/Gb
II 1/2 D Ex ia IIIC T80 °C…T110 °C Da/Db
IP66
Transmitter: II 2(1) G Ex eb mb [ia Ga] IIC T5 Gb
II 2(1) D Ex tb [ia Ga] IIIC T80°C Db
IP66
Certification body and certificate no.: Electrosuisse, Fehraltorf (CH)
SEV 14 ATEX 0107
IECEx SEV 14.0002
CML 22UKEX3190
Date: 25.04.2022
Operating temperature range: Tamb = [-10 °C … +60 °C] with LCD
Tamb = [-40 °C … +60 °C] without LCD
In: [20 VDC … 28 VDC], 2 W
Out: [4 mA … 20 mA], 2-wire current loop
Symbols: 
2503 