ATEX Belt Misalignment Switches

HES EX

Article Number: 2D: 92.096 187.xxx; 3D: 92.096 319.xxx

  • Alu housing
  • Stainless steel roller Ø 50 mm
  • Adjustable prewarning
  • without latching

Features

KIEPE belt misalignment switches type HES EX are used to monitor the misalignment of conveyor belt systems in accordance with the requirements of EN 620. They are used to protect the system from damage or destruction in the event of belt misalignment and are installed in pairs on both sides of the upper or lower run in areas at risk. The ball-bearing roller lever made of alloy steel and with a large roller diameter is resistant to wear that occurs when the moving belt touches the roller. The KIEPE misalignment switches Type HES EX are suited for use in explosive atmosphere with conductive dust, Group II, category 2 , in zone 21 and 22 (Type HES EX 2D) or category 3, only in zone 22 (Type HES EX 3D).The Kiepe misalignment switch Type HES EX complies with the ATEX Directive 2014/34/EU and meets the safety objectives of the Low Vol-tage Directive 2014/35/EU. KIEPE Misalignment switch Type HES EX features a robust aluminum housing and is equipped with 4 force-actuated changeover contacts with snap-action function with two settable switching points.
 

 Note:
 The misalignment switch must only be used in electrical control circuits.

Corrosive

Powder
Gravel
Rubble

Non-Corrosive

Powder
Gravel
Rubble

The misalignment switch type HES EX switches when the actuating roller is approached and deflected by the misaligned conveyor belt in the direction of rotation of the roller lever. The stainless steel roller lever is mounted on ball bearings, making it better able to absorb lateral forces and impacts. The switching angle can be set for each switching contact using an adjustable roller. In addition to the safety cut-out, this also enables an advance warning to be realized. When the belt is running correctly, the roller lever resets itself automatically.

 DesignationMisalignment Switch Type HES EX
 Type of actuationBidirectional (double-side) via roller lever 
Complies withEN 60947-5-1; EN 60079-31; (EN IEC 60079-0)
 Suited forControl units in accordance with DIN EN 60204-1
General
Device group / device categoryII/ 2D, 3D; flammable, conductive dust
 Type of protection Protection through housing
for Zone 21,22   HES EX II 2DEX II 2D Ex tb IIIC T85°C Db IP67
for Zone 22        HES EX II 3DEX II 3D Ex tc IIIC T85°C Dc IP67
CertificatesEPS 12 ATEX 1 479 X, IECEx EPS 14.0040X
ATEX/ IECEx
 EnclosureAluminum
 CoatingPU 2K-paint;
Enclosure – yellow (RAL 1004), release lever – red (RAL 3000), reset lever – blue (RAL 5010)
 Actuating leverStainless steel; ∅ 50 mm, ball-beared roller
 Mounting2 x M8
 Deflection of roller lever (max.)+/- 75°
 Weight2,1 kg
Mechanics
Switching system (max.)4 SPDT (snap action) positive-opening switches
Switching range2.5°…12.5° and 15°…35°, adjustable (factory setting 10°)
 Cable entry
(included in scope of delivery)
 2 x M25 x 1,5 with red transport lock  
1x screwed cable gland: sealing area ∅ 10 mm to ∅ 17 mm; 1x dummy screw
Utilization categoryAC-15: 230V ; 1,5A
DC-13: 60V; 0,5A
DC-13: 24V; 2A
Connection cross section (max.)2,5 mm2
 Protective conductor connectionProtection Class I / protective earthing
 Potential equalization connectionEnclosure / Cover 
Rated insulation voltage Ui250 V
 Rated impulse withstand voltage Uimp2.5 kV, Overvoltage category II, degree of polution 3
 Conventional thermal current Ith6 A
 Electrical system
Only valid for bus module standard variants: 
Supply voltage8.2 V
Power consumption (max.)70 mA
 Permissible ambient temperature–25 °C …+70 °C
Extended ambient temperature–40 °C …+70 °C (Type HES EX 7xx)
Protection rating (according to EN 60529)IP67
Ambient conditions according to DIN EN 60947-5-5
 Contact reliability at AC-15 230V, 1.5 A >30.000 operations bei 100% Ie
 Reliability

The misalignment switch type HES EX 1 is fastened to a substructure in the installation position with 2 M8 screws each. In the event of misalignment, the belt 2 must not leave the guide rollers. The actuating roller of the roller lever should preferably be approached vertically by the belt 2 in the event of misalignment. During normal operation, the actuating roller of the misalignment switch is not touched. The roller lever is replaceable and can be variable fixed on the switch axis. The electrical connection is made when the device is open via the cable gland included in the scope of delivery directly to the connection glands of the switching elements.

Important Note:
For protection against electrostatic discharge HES EX is provided with conductive compounds and an external potential equalization connection, to which a minimum of 4 mm2 potential equalization cable must be connected directly to the system. All connections must be checked regularly in accordance with the operation instructions.

Variants

Name Ordering No. Weight Approvals ATEX Zone Contacts
NC
NO
SPDT
HES EX 011 2D 92.096 187.011 2.2 kg / 1 Unit
2 (Au)
HES EX 011 3D 92.096 319.011 2.1 kg / 1 Unit
2 (Au)
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