Hontzsch UFA-Ex-d FA Di User manual

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U414_UxA_Bt_e_220802 1/5
Instruction Manual
UFA-Ex-d FA Di, ZS, TS (UFA)
UVA-Ex-d VA Di or VA40 (UVA)
UTA-Ex-d TA Di or TA10/15 (UTA)
with transducer processing unit in a flameproof enclosure
Apparatus
Vane wheel flow sensors, vortex flow sensors and thermal flow sensors, as probe or measuring tube with
transducer processing unit in a flameproof enclosure with optional LCD display.
These are intrinsically safe sensors for measuring the flow velocity and the flow rate (standard flow velocity
and standard flow rate in the case of UTA) of gases (UFA, UVA, UTA) and liquids (UFA only) with a non-
intrinsically safe transducer processing unit in a flameproof enclosure. They are designed for use in areas in
which category 1 apparatus is required. Assembly is carried out either with flange or probe guide piece in
the zone partition. The electronics housing is located in areas which require category 2 apparatus.
1. Safety Precautions
Please read this Instruction Manual carefully before initial operation!
Non-compliance can cause an explosion!
The apparatus may be installed only in category 1/2G and 2G or 1/2D and 2D areas in which the ambient
temperature range of -20 to +60 °C or -40 to +60 °C for the TT (cryogenic) version for the electronics
housing, as marked on the type plate and in the corresponding technical documents, is not exceeded. With
the TT version the terminal clamps must not be used at temperatures below -20 °C!
The temperature of the medium in category 1/2G areas must not exceed +60 °C under atmospheric pres-
sure. For UFA and UVA, the maximum admissible temperature of the medium in category 2G areas corre-
sponds to the temperature class. For UTA, the maximum admissible temperature of the medium in category
2G areas for temperature class T4 corresponds to 130 °C, and for temperature class T3 … T1 140 °C.
See also details on the type plate as well as in the corresponding technical documents.
For UFA and UVA in category 1/2D and 2D areas self-heating need not be considered. For UTA, the addi-
tional maximum surface temperature in category 1/2D and 2D areas is 135 °C. For maximum temperature
of the medium refer to the type plate and corresponding technical documents.
The gas container for the medium is to be insulated in such a way as to ensure that the electronics housing
of the apparatus does not take on temperatures exceeding the above mentioned maximum ambient tem-
peratures, taking radiant and convective heat into account.
Sensors may be used only in areas in which the temperature of the gas medium, the ambient temperature,
the maximum admissible overpressure, as specified on the type plate, are not exceeded.
For applications in pressurized pipelines sensors are to be inserted or retracted in depressurized conditions
only. Non-observance can result in serious harm to personnel.
The cover of the flameproof enclosure which is furthest away from both cable glands may only be opened in
the safety zone or when disconnected.

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2/5 U414_UxA_Bt_e_220802
Tightness of the zone separation must be ensured by using a standardised process connection (> or =
IP67).
There is no safety-related electrical isolation between Ex-i and equipotential bonding. Therefore, this must
be guaranteed both inside and outside the explosive atmospheres when installing.
Titanium sensors (UFA) only have approval for applications in zone 1 (category 2G) areas, unless fitted with
additional preventive measures (e.g. safety mesh).
2. Technical Data
EC type examination certificate: IBExU 06 ATEX 1103 X
UFA and UVA:
Marking
Explosion protection: Ex ia/db eb [ia] IIC T6 Ga/Gb
Marking
Explosion protection: Ex ia/tb IIIC TX Da/Db
UTA:
Marking
Explosion protection: Ex ia/db eb [ia] IIC T4 Ga/Gb
Marking
Explosion protection: Ex ia/tb IIIC T135°C Da/Db
X: There are certain special factors to be observed for applications in explosive atmospheres (see under 1).

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U414_UxA_Bt_e_220802 3/5
2.1 Electrical Data
Power supply : 24 V DC (20 ... 27 V DC) < 5 W
Current consumption : < 150 mA
Terminals KL1 : +24 V DC = Power DC L+
0 V DC = Power DC L-
Analog output : 4 ... 20 mA, resistance max. 500 Ohm
Terminals KL2 : += Output Flow + 4 ... 20mA
- = Output Flow - 4 ... 20mA
Relay output : potential-free, max. 30 V DC, 100 mA
Terminals KL3 : output relay, normally-open contact
Terminal connections
3. Installation
The relevant standards for installing electrical equipment, the General Engineering Regulations and these
Operating Instructions apply.
The apparatus is to be connected to the local equipotential bonding system according to the currently valid
regulations. A protective ground terminal on the exterior of the flameproof enclosure serves this purpose.
The earth terminal is designed for cross-sections of 4 … 6 mm². Use a cable lug. The torque for fixture to
the earth terminal must amount to 2 … 3 Nm.
Cables are connected to the protection type "e" terminal blocks in the terminal compartment via two protec-
tion type "e" cable glands. Condition as supplied to customer: one "e" cable gland and one "e" screw plug.
Cable glands M20 thread are used for cables with an exterior diameter of 5 … 9 mm. The cable gland is to
be tightened with a torque of 4 Nm.
The terminals are for wires with a cross-section of 0.5 … 2.5 mm², AWG 20 to 16. Wire end sleeves must be
used. Bare wires must not be visible after installation. The connection cables used must be usable for the
temperature range of -25 … +80 °C.
We recommend a regulated mains adapter 24V DC 10% output, rating > 6 W, current >250 mA.
4. Cleaning / Maintenance
Sensors should be cleaned at regular intervals.
Any covering of dust on the electronic housing may not exceed 5 mm.
The housing cover threads are treated with graphite to protect against corrosion.
Any other maintenance or repair work is to be carried out solely by Höntzsch GmbH & Co. KG.
LL+
PowerOutput
Relay Flow DC
+
KL1KL2KL3
1
2
3
4
5
6

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4/5 U414_UxA_Bt_e_220802
Analog output connection
Power supply connection
Electrical Connections
Shielding terminals inside
the Ex-d housing (terminal
compartment)
Protective ground
terminal on the
outside of the
housing
Equipotential
bonding
24 V DC
(20 … 27 V DC)

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U414_UxA_Bt_e_220802 5/5
Declaration of conformity, Declaration of Incorporation
We, Höntzsch GmbH & Co. KG
Gottlieb-Daimler-Str. 37
D-71334 Waiblingen
bearing sole responsibility, hereby declare that the product
flow measuring equipment
UFA-Ex-d measuring tubes FA Di, probes ZS, TS
UVA-Ex-d measuring tubes VA Di, probes VA40
UTA-Ex-d measuring tubes TA Di, probes TA10/15
with EC type examination certificate IBExU 06 ATEX 1103 X
referred to by this declaration is in conformity with the following standards or normative documents:
Provisions of the Directive
Reference no. and date of issue
2014/34/EU: Equipment and Protective Systems in
Potentially Explosive Atmospheres
EN 60079-0: 2018
EN 60079-1: 2014
EN 60079-7: 2015
EN 60079-11: 2012
EN 60079-26: 2015
EN 60079-31: 2014
2014/30/EU: Electromagnetic Compatibility
EN 61000-6-4: 2007 + A1: 2011
EN 61000-6-2: 2006 + Corrigendum 1: 2011
2014/68/EU: Pressure Equipment Directive
One or more of these standards referred to in the EC type examination certificate have been replaced by
new versions. We declare that we are also in agreement with these new versions.
Waiblingen, 02.08.2022 Jürgen Lempp / Managing Director
Subject to alteration
Höntzsch GmbH & Co. KG
Gottlieb-Daimler-Straße 37
D-71334 Waiblingen
Telefon +49 7151 / 17 16-0
E-Mail [e-mail]
Internet www.hoentzsch.com