KTR RIGIFLEX-N Manual

KTR Kupplungstechnik
GmbH
D-48407 Rheine
RIGIFLEX®-N
Operating-/Assembly Instructions
KTR-N
sheet:
edition:
47410 EN
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RIGIFLEX®-N
Torsionally stiff, steel laminae couplings
type A
according to Standard 94/9/EC
(ATEX 95) for finish bored, pilot
bored and unbored couplings
size 35
size 50 - 408

KTR Kupplungstechnik
GmbH
D-48407 Rheine
RIGIFLEX®-N
Operating-/Assembly Instructions
KTR-N
sheet:
edition:
47410 EN
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RIGIFLEX®-N is a torsionally stiff, flexible steel laminae coupling which is able to compensate
for shaft misalignment caused by, for example, thermal expansion.
Table of Contents
1 Technical Data
2 Hints
2.1 Coupling Selection
2.2 General Hints
2.3 Safety and Advice Hints
2.4 General Hints to Danger
2.5 Proper Use
3 Storage
4 Assembly
4.1 Components of the Couplings
4.2 Hints Regarding the Finish Bore
4.3 Assembly of the Coupling Hubs
4.4 Assembly of Spacer
4.5 Displacements - Alignment of the Couplings
4.6 Spares Inventory, Customer Service Addresses
5 Enclosure A
Hints and Instructions Regarding the Use in Hazardous Areas
5.1 Selection of the Coupling Size
5.2 Use in Hazardous Areas According to the Regulations
5.3 Control Intervals for Couplings in Hazardous Areas
5.4 Visual Check and Measures
5.5 Permissible Coupling Materials in the Hazardous Area
5.6 Marking of Coupling for the Hazardous Area
5.7 Starting
5.8 Breakdowns, Causes and Elimination
5.9 EC Certificate of Conformity according to the EC Standards 94/9/EC
dated 23 March 1994

KTR Kupplungstechnik
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D-48407 Rheine
RIGIFLEX®-N
Operating-/Assembly Instructions
KTR-N
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47410 EN
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1 Technical Data
size 35 size 50 - 408
illustration 1: RIGIFLEX®-N, type A
Table 1: type A
Dimensions [mm]
General Thread for
setscrews
RIGIFLEX®-N
Size
Max.
finish
bore
[mm]
d1, d2D DAd
3l 1, l2l 3l 4E 1E
1) G t1t
2
35 50 - 75 70 38,5 8,5 1,5 6 100 140 - - - M6 15 -
50 50 70 95 55 50 12 1,0 9 100 140 - - - M6 10 -
65 65 100 126 75 62 12 2,0 10 100 140 180 - - M8 20 -
75 75 105 138 85 62 12 2,5 10 100 140 180 - - M8 20 -
85 85 120 156 95 72 15 2,5 12 - 140 180 200 250 M10 20 -
110 110 152 191 120 87 18 3,0 12 - 140 180 200 250 M10 25 -
120 120 165 213 130 102 20 3,0 12 - - 180 200 250 M12 25 -
140 140 200 265 160 126 25 4,0 15 - - - 200 250 M12 30 -
160 160 230 305 170 145 31 5,0 15 - - - - 250 M12 30 -
166 160 230 305 184 155 31 2,0 17 M16 30 70
196 190 260 330 200 185 32 2,5 24 M16 40 90
216 210 285 370 220 205 32 2,5 26 M20 50 110
256 250 350 440 265 245 38 2,5 31 M20 70 130
306 300 400 515 310 295 43 3,0 36 M24 70 130
346 340 460 590 370 335 55 3,0 45 M24 95 175
406 400 530 675 420 395 58,5 3,0 50 M24 95 175
168 160 230 305 184 155 31 2,0 17 M16 30 70
198 190 260 330 200 185 32 2,5 24 M16 40 90
218 210 285 370 220 205 32 2,5 26 M20 50 110
258 250 350 440 265 245 38 2,5 31 M20 70 130
308 300 400 515 310 295 43 3,0 36 M24 70 130
348 340 460 590 370 335 55 3,0 45 M24 95 175
408 400 530 675 420 395 58,5 3,0 50
On request of customer
M24 95 175
1) Other shaft distances available on request 2) Values Mxl see table 6

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RIGIFLEX®-N
Operating-/Assembly Instructions
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1 Technical Data
Table 2: torque and speed
RIGIFLEX®-N Size 35 50 65 75 85 110 120 140 160
TKN 120 240 450 940 1700 2700 4500 9000 13000
TK max. 240 480 900 1880 3400 5400 9000 18000 26000
Torque
[Nm] TKW 30 120 225 470 850 1350 2250 4500 6500
Max. speed n [rpm] 23000 18000 13600 12400 11000 9000 8000 6400 5600
RIGIFLEX®-N Size 166 196 216 256 306 346 406
TKN 17500 22500 32000 52500 86000 135000 210000
TK max. 35000 45000 64000 105000 172000 270000 420000
Torque
[Nm] TKW 8750 11250 16000 26250 43000 67500 105000
Max. speed n [rpm] 5600 5600 5200 4600 3900 3300 2900
RIGIFLEX®-N Size 168 198 218 258 308 348 408
TKN 23000 30000 42500 70000 115000 180000 280000
TK max. 46000 60000 85000 140000 230000 360000 560000
Torque
[Nm] TKW 11500 15000 21500 35000 57500 90000 140000
Max. speed n [rpm] 5600 5200 4600 3900 3300 2900 2500
RIGIFLEX®-N couplings with attached parts that can generate heat, sparks and static
charging (e. g. combinations with brake drums, brake disks, overload systems like torque
limiters, impellers etc.) are not allowed for the use in hazardous areas.
A separate checking must be made.
2 Hints
2.1 Coupling Selection
!
CAUTION!
For a continuous and troublefree operation of the coupling it must be designed according to
the selection instructions for the particular application (see RIGIFLEX®-N catalogue).
If the operating conditions (performance, speed, changes at engine and machine) change,
the coupling selection must be checked again.
Please make sure that the technical data regarding torque only refers to the laminae
package. The transmissible torque of the shaft/hub connection must be checked by the
orderer, and he is responsible for the same.
For drives with endangered torsional vibration (drives with periodical load on torsional vibration) it is necessary to
make a torsional vibration calculation to ensure a perfect selection. Typical drives with endangered torsional
vibration are e. g. drives with diesel engines, piston pumps, piston compressors etc. On request KTR makes the
coupling selection and the torsional vibration calculation.
2.2 General Hints
Please read through these mounting instructions carefully before you set the coupling into operation.
Please pay special attention to the safety instructions!
The RIGIFLEX®-N coupling is suitable and approved for the use in hazardous areas. When using the
coupling in hazardous areas please observe the special hints and instructions regarding safety in
enclosure A.
The mounting instructions are part of your product. Please keep them carefully and close to the coupling.
The copyright for these mounting instructions remains with KTR Kupplungstechnik GmbH.

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RIGIFLEX®-N
Operating-/Assembly Instructions
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2 Hints
2.3 Safety and Advice Hints
STOP
DANGER! Dangerofinjurytopersons.
! CAUTION! Damagesonthemachinepossible.
)A TTE NT IO N! Pointing to important items.
PRECAUTION! Hintsconcerningexplosionprotection.
2.4 General Hints of Danger
STOP
DANGER!
With assembly, operation and maintenance of the coupling it has to be made sure that the
entire drive train is protected against unintentional engagement. You can be seriously hurt
by rotating parts. Please make absolutely sure to read through and observe the following
safety instructions.
•All operations on and with the coupling have to be performed taking into account "safety first".
•Please make sure to disengage the power pack before you perform your work.
•Protect the power pack against unintentional engagement, e. g. by providing hints at the place of engagement
or removing the fuse for current supply.
•Do not touch the operation area of the coupling as long as it is in operation.
•Please protect the coupling against unintentional touch. Please provide for the necessary protection devices
and caps.
2.5 Proper Use
You may only assemble, operate and maintain the coupling if you
•carefully read through the mounting instructions and understood them
•had technical training
•are authorized to do so by your company
The coupling may only be used in accordance with the technical data (see table 1 and 2 in chapter 1).
Unauthorized modifications on the coupling design are not admissible. We do not take any warranty for resulting
damages. To further develop the product we reserve the right for technical modifications.
The RIGIFLEX®-N described in here corresponds to the technical status at the time of printing of these mounting
instructions.
3 Storage
The coupling hubs are supplied in preserved condition and can be stored at a dry and roofed place for
6 - 9 months.
!
CAUTION!
Humid storage rooms are not suitable.
Please make sure that there is no condensation. The best relative air humidity is under 65%.

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RIGIFLEX®-N
Operating-/Assembly Instructions
KTR-N
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47410 EN
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4 Assembly
The spacer is supplied fully assembled. Before assembly the coupling has to be controlled for completeness.
4.1 Components of the Couplings
Components of RIGIFLEX®-N type A
Component Quantity Designation Component Quantity Designation
1 2 Coupling hub
2 1 Spacer complete 4 see table 4 Setscrews
DIN EN ISO 4029
3 see table 3 Cap screws
size 35 size 50 - 408
illustration 2: RIGIFLEX®-N, type A
Table 3:
RIGIFLEX®-N Size 35 50 65 75 85 110 120 140 160
Quantity of cap screws 1) 24 16 24 24 36 36 36 36 36
RIGIFLEX®-N Size 166 196 216 256 306 346 406
Quantity of cap screws 1) 24 24 36 36 36 36 36
RIGIFLEX®-N Size 168 198 218 258 308 348 408
Quantity of cap screws 1) 32 32 48 48 48 48 48
1) quantity each coupling
Table 4:
RIGIFLEX®-N Size 35 50 65 75 85 110 120 140 160
Quantity of setscrews 1) 2 2 2 2 2 2 2 2 2
RIGIFLEX®-N Size 166 196 216 256 306 346 406
Quantity of setscrews 1) 4 4 4 4 4 4 4
RIGIFLEX®-N Size 168 198 218 258 308 348 408
Quantity of setscrews 1) 4 4 4 4 4 4 4
1) quantity each coupling

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RIGIFLEX®-N
Operating-/Assembly Instructions
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4 Assembly
4.2 Hints Regarding the Finish Bore
STOP
DANGER!
The maximum permissible bore diameters d (see table 1 in chapter 1 - Technical Data) must
not be exceeded. If these figures are disregarded, the coupling may tear. Rotating particles
may cause serious danger.
•Coupling hub bores machined by the customer have to observe concentric running or axial running,
respectively (see illustration 3).
•Please make absolutely sure to observe the figures for dmax.
•Carefully align the coupling hubs when the finish bores are brought in.
•Please use a setscrew according to DIN EN ISO 4029 with a cup point or an end plate to fasten the hubs
axially.
size 35 size 50 - 408
illustration 3: concentric running and axial running
!
CAUTION!
The orderer is responsible for all subsequently made machinings to unbored or pilot bored
and to finish machined coupling parts and spare parts. KTR does not assume any warranty
claims resulting from insufficient refinish.
PRECAUTION!
Any mechanical rework to couplings that are used in hazardous areas require an explicit
release by KTR.
The orderer must send a drawing to KTR acc. to which the manufacture must be made. KTR
checks this drawing and returns it to the orderer with approval.
KTR supplies unbored or pilot bored coupling parts and spare parts on explicit customer´s
request. These parts are additionally labelled with the symbol .
Table 5: setscrews DIN EN ISO 4029
RIGIFLEX®-N Size 35 50 65 75 85 110 120 140 160
Dimension G [mm] M6 M6 M8 M8 M10 M10 M12 M12 M20
Tightening torque TA[Nm] 4,8 4,8 10 10 17 17 40 40 140
RIGIFLEX®-N Size 166 196 216 256 306 346 406
Dimension G [mm] M16 M16 M20 M20 M24 M24 M24
Tightening torque TA[Nm] 80 80 140 140 140 140 140
RIGIFLEX®-N Size 168 198 218 258 308 348 408
Dimension G [mm] M16 M16 M20 M20 M24 M24 M24
Tightening torque TA[Nm] 80 80 140 140 140 140 140

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RIGIFLEX®-N
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4 Assembly
4.3 Assembly of the Coupling Hubs
)ATTENTION!
We recommend to check bores, shaft, keyway and feather key for dimensional accuracy
before assembly.
Heating the coupling hubs slightly (approx. 80 °C) allows for an easier installation onto the shaft.
PRECAUTION!
Please pay attention to the danger of ignition in hazardous areas.
STOP
DANGER!
Touching the heated coupling hubs causes burns.
We would recommend to wear safety gloves.
!
CAUTION!
During the assembly please make sure that the E dimension (see table 1) is observed, so
that the coupling parts do not contact each other during the operation.
Disregarding this hint may cause damage on the coupling.
For the axial alignment of the coupling the dimensions E (see table 1) are decisive. In order to adjust the right
dimension E you should proceed as follows:
•Push the coupling hubs onto the shaft of the drive and driven side.
•The inner sides of the coupling hubs must end flushly with the front sides of the shafts (illustration 4).
•Move the power pack in axial direction until you have reached dimension E (see table 1).
•Secure the coupling hubs by tightening the setscrews DIN EN ISO 4029 with cup point (see table 5).
illustration 4: assembly of the coupling hubs
ATTENTION!
For the applications in hazardous areas the setscrews to fasten the hubs as well as all
screw connections have to be secured against self-slackening additionally, e. g. by glueing
with Loctite (medium-tight).
Disassembly:
STOP
DANGER!
Falling parts can lead to personal injury or damage to the machine.
Secure the driving parts during disassembly.
•Untighten the setscrew in the hub and unscrew it by 2 – 3 convolutions.
•Pull the hub from the shaft.

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RIGIFLEX®-N
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4 Assembly
4.4 Assembly of the Spacer
•Align the coupling hubs so that the through holes from the
coupling hubs line up.
•Clean and degrease the centrings and contact surfaces at the
spacer and at the coupling hubs.
•Pull up the flanges of „spacer complete“ closer to the spacer at
the maximum value R (table 6) in each case by means of the
return screws (illustration 5).
•Insert the spacer between the hubs.
•Centre the spacer in the coupling hubs by unscrewing the
return screws.
!
CAUTION!
The return screws have to be removed for the
further assembly and the operation.
•Assemble the spacer to the coupling hubs with the cap screws
hand tight (illustration 6).
•Tighten the cap screws one after another and with several
revolutions until they all cap screws have the full tightening
torque (see table 7).
illustration 5
illustration 6
Table 6
RIGIFLEX®-N Size 35 50 65 75 85 110 120 140 160
Value R [mm] 1,7 1,2 1,2 1,7 1,7 2,2 2,2 3,2 4,2
RIGIFLEX®-N Size 166 / 168 196 / 198 216 / 218 256 / 258 306 / 308 346 / 348 406 / 408
Value R [mm] 2,2 2,7 2,7 2,7 3,2 3,2 3,2
Table 7: tightening torques of the cap screws
RIGIFLEX®-N Size 35 50 65 75 85 110 120 140 160
Dimension Mxl [mm] M4x45 M6x22 M6x25 M8x30 M8x30 M10x35 M12x40 M16x50 M16x55
Tightening torque TA[Nm] 4,1 14 14 35 35 69 120 295 295
RIGIFLEX®-N Size 166 / 168 196 / 198 216 / 218 256 / 258 306 / 308 346 / 348 406 / 408
Dimension Mxl [mm] M20x50 M20x50 M20x65 M24x80 M27x100 M30x110 M36x130
Tightening torque TA[Nm] 560 560 560 970 1450 1950 3900
!
CAUTION!
Having set the coupling into operation, the tightening torque of the cap screws has to be
investigated at regular maintenance intervals.
For spacers with axial limitation (as an option) please note the
following:
•Before mounting the spacer, remove the screws and discs of the
axial limitation.
•Having mounted the spacer completely, please re-assemble the
screws and discs of the axial limitation (illustration 7). Please
note the axial backlash S as per dimension sheet.
•Secure the screws against untightening by means of adhesive
(e. g. Loctite).
illustration 7

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RIGIFLEX®-N
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4 Assembly
4.5 Displacements - Alignment of the Couplings
The displacement figures shown in table 8 offer sufficient safety to compensate for environmental influences like,
for example, heat expansion or lowering of foundation.
!
CAUTION!
In order to ensure a long lifetime of the coupling and to avoid dangers regarding the use in
hazardous areas, the shaft ends must be accurately aligned.
Please absolutely observe the displacement figures indicated (see table 8). If the figures are
exceeded, the coupling is damaged.
The exacter the alignment of the coupling, the higher is its lifetime.
In case of a use in hazardous areas for the explosion group IIC (marking II 2GD c IIC T X),
only the half displacement figures (see table 8) are permissible.
Please note:
•The displacement figures mentioned in table 8 are maximum figures which must not arise in parallel. In case
of a simultaneous radial, axial and angular displacement, these values must be reduced (see illustration 9).
•Please check with a dial gauge, ruler or feeler whether the permissible displacement figures of table 8 can be
observed.
angular displacements radial displacements axial displacements
illustration 8: displacements
Example for the misalignment
combinations given in illustration 9:
Example 1:
∆Kr= 10%
∆Kw= 80%
∆Ka= 10%
Example 2:
∆Kr= 30%
∆Kw= 30%
∆Ka= 40%
∆Ktotal = ∆Ka+ ∆Kr+ ∆Kw≤100 %
illustration 9:
combinations of
displacement

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RIGIFLEX®-N
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4 Assembly
4.5 Displacements - Alignment of the Couplings
Table 8: displacement figures
Radial displacement
∆Kr[mm]
RIGIFLEX®-N
Size
Angular *
displacements
∆Kw[°]
Axial
displacements
∆Ka[mm] E=100 E=140 E=180 E=200 E=250
35 0,7 1,2 0,90 1,40 - - -
50 0,7 1,4 0,77 1,26 - - -
65 0,7 1,5 0,75 1,23 1,72 - -
75 0,7 1,8 0,73 1,22 1,71 - -
85 0,7 2,1 - 1,14 1,62 1,87 2,48
110 0,7 2,4 - 1,05 1,54 1,78 2,39
120 0,7 2,6 - 1,00 1,49 1,73 2,35
140 0,7 3,3 - - - 1,55 2,16
160 0,7 3,8 - - - - 1,99
166 0,7 3,7
196 0,7 4,2
216 0,7 4,5
256 0,7 5,2
306 0,7 6,0
346 0,7 6,7
406 0,7 7,5
168 0,5 2,6
198 0,5 2,6
218 0,5 2,9
258 0,5 3,5
308 0,5 4,2
348 0,5 4,8
408 0,5 5,0
Mounting dimension E as indicated by the customer
* each laminae package
4.6 Spares Inventory, Customer Service Addresses
A basic requirement to guarantee the operational readiness of the coupling is a stock of the most important spare
parts on site.
Contact addresses of the KTR partners for spare parts and orders can be obtained from the KTR homepage
under www.ktr.com.

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5 Enclosure A
Hints and Instructions Regarding the Use in Hazardous Areas
Type A: coupling hub / coupling flange / laminae package / spacer / laminae package / coupling flange /
coupling hub
RIGIFLEX®-N only with spacer made from steel.
5.1 Selection of the Coupling Size
If the coupling is used in explosion proof areas, the size must be selected in a way that there is a minimum safety
of s = 2,0 from the unit torque to the nominal torque of the coupling.
5.2 Use in Hazardous Areas According to the Regulations
Conditions of operation in hazardous locations
RIGIFLEX®-N couplings are suitable for the use according to EC standard 94/9/EC.
The couplings may only be used if their materials are resistant to mechanical and/or chemical influences with the
different operating conditions in a way that the explosion protection is not affected.
1. Industry (with the exception of mining)
•device class II of category 2 and 3 (coupling is not approved for device class 1)
•media class G (gases, fogs, steams), zone 1 and 2 (coupling is not approved for zone 0)
•media class D (dusts), zone 21 and 22 (coupling is not approved for zone 20)
•explosion class IIC (explosion class IIA and IIB are included in IIC)
Temperature class:
Temperature class Ambient temperature Max. surface temperature 1)
T2, T1 - 30 °C to + 250 °C 250 °C
T3 - 30 °C to + 190 °C 200 °C
T4 - 30 °C to + 125 °C 135 °C
T5 - 30 °C to + 90 °C 100 °C
T6 - 30 °C to + 75 °C 85 °C
Explanation:
The maximum surface temperatures result from each the maximum permissible ambient or operating temperature Taplus the
maximum temperature increase ∆T of 10 K which has to be taken into account.
1) The ambient or operating temperature Tais limited to + 250 °C due to the permissible permanent operating temperature.
2. Mining
Device class I of category M2 (coupling is not approved for device category M1).
Permissible ambient temperature - 30 °C to + 140 °C.

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5 Enclosure A
Hints and Instructions Regarding the Use in Hazardous Areas
5.3 Control Intervals for Couplings in Hazardous Areas
Explosion group Control intervals
3G
3D
For couplings which are classified in category 3G or 3D the operating and assembly
instructions that are usual for standard operation apply. During the standard operation
which has to be subject to the analysis of danger of ignition the couplings are free from any
ignition source. Merely the temperature increase produced by proper heating and
depending on the coupling type has to be considered: for RIGIFLEX®-N: ∆T = 10 K
II 2GD c IIB
T1, T2, T3,
T4, T5, T6
A checking of the circumferential backlash and a visual check of the laminae package must
be effected after 3,000 operating hours for the first time, after 6 months at the latest.
If you note an unconsiderable or no wear at the laminae package after this first inspection,
the further inspections can be effected, in case of the same operating parameters,
respectively after 6,000 operating hours or after 18 months at the latest.
If you note a considerable wear during the first inspection, so that a change of the laminae
package would be recommended, please find out the cause according to the table
„Breakdowns“, as far as possible.
The maintenance intervals must be adjusted according to the changed operating
parameters.
II 2GD c IIC
T1, T2, T3,
T4, T5, T6
A checking of the circumferential backlash and a visual check of the laminae package must
be effected after 2,000 operating hours for the first time, after 3 months at the latest.
If you note an unconsiderable or no wear at the laminae package after this first inspection,
the further inspections can be effected, in case of the same operating parameters,
respectively after 4,000 operating hours or after 12 months at the latest.
If you note a considerable wear during the first inspection, so that a change of the laminae
package would be recommended, please find out the cause according to the table
„Breakdowns“, as far as possible.
The maintenance intervals must be adjusted according to the changed operating
parameters.
illustration 10: RIGIFLEX®-N, type A

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5 Enclosure A
Hints and Instructions Regarding the Use in Hazardous Areas
5.4 Visual Check and Measures
During the visual control the laminae packages must be checked concerning cracks and detached cap screws.
Detached cap screws must be tightened with the screw tightening torque to be observed (see table 7).
Regardless of the inspection intervals those laminae packages having fissures have to be replaced by a new
„fully assembled spacer“ immediately.
illustration 11: RIGIFLEX®-N, type A
!
CAUTION!
In order to ensure a long lifetime of the coupling and to avoid dangers regarding the use in
hazardous areas, the shaft ends must be accurately aligned.
Please absolutely observe the displacement figures indicated (see table 8). If the figures are
exceeded, the coupling is damaged. Defect parts have to be replaced.
5.5 Permissible Coupling Materials in the Hazardous Area
In the Explosion Groups IIA, IIB and IIC the following materials may be combined:
steel - steel
stainless steel - stainless steel
Semifinished products from aluminium with a magnesium part of up to 7,5 % and a yield point of
Rp0,2 ≥250 N/mm2are permitted for the use in hazardous areas.
Aluminium diecast is generally excluded for hazardous areas.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
RIGIFLEX®-N
Operating-/Assembly Instructions
KTR-N
sheet:
edition:
47410 EN
15 of 19
6
Gezeichnet: 02.02.12 Kb/Sta Ersatz für: KTR-N vom 15.11.10Schutzvermerk
ISO 16016 beachten. Geprüft: 09.02.12 Kb Ersetzt durch:
5 Enclosure A
Hints and Instructions Regarding the Use in Hazardous Areas
5.6 Marking of Coupling for the Hazardous Area
Couplings for the use in hazardous areas are marked on at least one component short or completely and on the
remaining components at the outside diameter of the hub or on the front side with an label for the respectively
permitted conditions of use. The laminae package is excluded.
Complete labelling: II 2G c IIC T6, T5, T4, T3 bzw. T2 - 30 °C ≤Ta≤+ 75 °C, + 90 °C,
+ 125 °C, + 190 °C bzw. + 250 °C
II 2D c T 110 °C - 30 °C ≤Ta≤+ 100 °C /I M2 c - 30 °C ≤Ta≤+ 140 °C
Short labelling: II 2GD c IIC T X/I M2 c X
The labelling with Explosion Group llC includes the Explosion Groups llA and llB.
If the coupling part is labelled with in addition to , KTR supplied it unbored or pilot bored.
!
CAUTION!
Any mechanical rework to couplings that are used in hazardous areas require an explicit
release by KTR.
The orderer must send a drawing to KTR acc. to which the manufacture must be made.
KTR checks this drawing and returns it to the orderer with approval.
5.7 Starting
Before putting the coupling into operation, check the tightness of the setscrews in the coupling hubs, the
alignment and the distance dimension E and correct, if necessary, and also check all screw connections
regarding the stipulated tightening torques dependent on the type of coupling.
If used in hazardous areas the grub screws to fix the coupling hub as well as all screw connections
must be additionally secured against self-loosening, e. g. glue with Loctite (medium strength).
Last but not least, the coupling protection against unintended contact must be fixed.
The cover must be electrically conductive and be included in the equipotential bonding. Bellhousings (magnesium
part below 7,5 %) made from aluminium and damping rings (NBR) can be used as connecting element between
pump and electro motor. The cover may only be taken off after having stopped the unit.
During operation, please pay attention to
•strange running noises
•occurring vibrations.
If the couplings are used in dust explosive areas and in mining the user must make sure that there is no
accumulation of dust in a critical quantity between the cover and the coupling. The coupling must no operate in
an accumulation of dust.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
RIGIFLEX®-N
Operating-/Assembly Instructions
KTR-N
sheet:
edition:
47410 EN
16 of 19
6
Gezeichnet: 02.02.12 Kb/Sta Ersatz für: KTR-N vom 15.11.10Schutzvermerk
ISO 16016 beachten. Geprüft: 09.02.12 Kb Ersetzt durch:
5 Enclosure A
Hints and Instructions Regarding the Use in Hazardous Areas
5.7 Starting
For covers with unlocked openings on the upper side no light metals may be used if the couplings are used as
appliances of appliance group ll (if possible, from stainless steel).
If the couplings are used in mining (appliance group l M2), the cover must not be made from light metal. In
addition, it must be resistant to higher mechanical loads than if it is used as appliance of appliance group ll.
The minimum distance „Sr“ of the protection device to the rotating parts must at least correspond to the figures
mentioned below.
If the protection device is used as cover, regular openings complying with the explosion protection demands can
be made that must not exceed the following dimensions:
Cover [mm]
Openings Top side Lateral parts Distance „Sr“
Circular - max. diameter 4 8
≥10
Rectangular - max. lateral length 4 8
≥10
Straight or curved slot -
max. lateral length/height prohibited 8 ≥20
!
CAUTION!
If you note any irregularities at the coupling during operation, the drive unit must be turned
off immediately. The cause of the breakdown must be found out with the table
„Breakdowns“ and, if possible, be eliminated according to the proposals. The possible
breakdowns mentioned can be hints only. To find out the cause all operating factors and
machine components must be considered.
Coupling layer:
If coated (priming, painting etc.) couplings are used in hazardous areas, the requirements to
conductability and layer thickness must be considered. In case of paintings up to 200 µm no
electrostatic load can be expected. Multiple coatings that are thicker than 200 µm are prohibited
for explosion group llC.
5.8 Breakdowns, Causes and Elimination
The below-mentioned errors can lead to an incorrect use of the RIGIFLEX®-N coupling. In addition to the
stipulations in these operating and mounting instructions please make sure to avoid these errors.
The errors listed can only be clues to search for the errors. When searching for the error the adjacent
components must be generally included.
Due to incorrect use the coupling can become a source of ignition.
EC Standard 94/9/EC requires a special care from the manufacturer and the user.
General errors incorrect use:
•Important data for the coupling selection was not forwarded.
•The calculation of the shaft/hub connection was not considered.
•Coupling parts with damage occurred during transport are assembled.
•If the heated hubs are assembled, the permissible temperature is exceeded.
•The fits of the parts to be assembled are not coordinated with each other.
•Tightening torques are below/exceeded.
•Components are exchanged by mistake/put together incorrectly.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
RIGIFLEX®-N
Operating-/Assembly Instructions
KTR-N
sheet:
edition:
47410 EN
17 of 19
6
Gezeichnet: 02.02.12 Kb/Sta Ersatz für: KTR-N vom 15.11.10Schutzvermerk
ISO 16016 beachten. Geprüft: 09.02.12 Kb Ersetzt durch:
5 Enclosure A
Hints and Instructions Regarding the Use in Hazardous Areas
5.8 Breakdowns, Causes and Elimination
Continuation:
•A wrong or no laminae package is inserted into the coupling.
•No original KTR parts (purchased parts) are used.
•The coupling used/the coupling protection used is not suitable for the operation in hazardous areas and does
not correspond to EC Standard 94/9/EC, respectively.
•Maintenance intervals are not observed.
Breakdowns Causes Danger hints for
hazardous areas Elimination
Misalignment ---
1) The unit out of operation
2) Eliminate the reason for the
misalignment (e. g. loose foundation
bolts, break of the engine fixing, heat
expansion of unit components, change
of the assembly dimension E of the
coupling)
3) Checking of wear see under point
Control
Loose cap screws,
low micro friction
under the screw
head and at the
steel laminae
package
Danger of ignition due
to hot surfaces
1) Put the unit out of operation
2) Check coupling parts and exchange
damaged coupling parts
3) Tighten the cap screws until reaching
the permissible tightening torque
4) Check alignment, correct if necessary
Change of the
running noises
and / or occurring
vibrations
Loose screws for
axial securement of
coupling hubs
---
1) Put the unit out of operation
2) Check alignment of coupling
3) Tighten the screws to secure the
coupling hubs and secure against self-
loosening
4) Checking of wear see under point
Control
Break of the steel
laminae package
due to high shock
energy / overload
Danger of ignition due
to sparking
1) Put the unit out of operation
2) Disassemble the coupling and remove
the rests of the steel laminae packages
3) Check coupling parts and exchange
damaged coupling parts
4) Insert spacer, assemble coupling parts
5) Find out the reason of overload
Break of the steel
laminae package
Operating
parameters do not
correspond to the
performance of the
coupling
Danger of ignition due
to sparking
1) Put the unit out of operation
2) Check the operating parameters and
select a larger coupling (consider
installation space)
3) Assemble new coupling size
4) Check alignment

KTR Kupplungstechnik
GmbH
D-48407 Rheine
RIGIFLEX®-N
Operating-/Assembly Instructions
KTR-N
sheet:
edition:
47410 EN
18 of 19
6
Gezeichnet: 02.02.12 Kb/Sta Ersatz für: KTR-N vom 15.11.10Schutzvermerk
ISO 16016 beachten. Geprüft: 09.02.12 Kb Ersetzt durch:
5 Enclosure A
Hints and Instructions Regarding the Use in Hazardous Areas
5.8 Breakdowns, Causes and Elimination
Breakdowns Causes Danger hints for
hazardous areas Elimination
Break of the steel
laminae package
Mistake in service of
the unit
Danger of ignition due
to sparking
1) Put the unit out of operation
2) Disassemble the coupling and remove
the rests of the steel laminae packages
3) Check coupling parts and exchange
damaged coupling parts
4) Insert spacer, assemble coupling parts
5) Instruct and train the service staff
Cracks in / break of
the steel laminae
packages / fixing
screws
Drive vibrations Danger of ignition due
to sparking
1) Put the unit out of operation
2) Disassemble the coupling and remove
the rests of the steel laminae packages
3) Check coupling parts and exchange
damaged coupling parts
4) Insert spacer, assemble coupling parts
5) Check alignment, correct if necessary
6) Find out the reason for the vibrations
If you operate with defect laminae package (see item 5.3) and the subsequent contact of metal
parts a due operation meeting the explosion protection requirements and acc. to Standard 94/9/EC
is not ensured.
)ATTENTION!
KTR does not assume any liabilities or guarantees regarding the use of spare parts and
accessories which are not provided by KTR and for the damages resulting here from.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
RIGIFLEX®-N
Operating-/Assembly Instructions
KTR-N
sheet:
edition:
47410 EN
19 of 19
6
Gezeichnet: 02.02.12 Kb/Sta Ersatz für: KTR-N vom 15.11.10Schutzvermerk
ISO 16016 beachten. Geprüft: 09.02.12 Kb Ersetzt durch:
5 Enclosure A
Hints and Instructions Regarding the Use in Hazardous Areas
5.9 EC Certificate of Conformity
EC Certificate of Conformity
corresponding to EC Standard 94/9/EC dated 23 March 1994
and to the legal regulations
The manufacturer - KTR Kupplungstechnik GmbH, D-48432 Rheine - states that the
RIGIFLEX®-N Steel Laminae Couplings
described in these mounting instructions and explosion-proof designed correspond to Article 1 (3) b)
of Standard 94/9/EC and comply with the general Safety and Health Requirements according to
enclosure II of Standard 94/9/EC.
According to article 8 (1) of Standard 94/9/EC the technical documentation is deposited with the:
IBExU
Institut für Sicherheitstechnik GmbH
Fuchsmühlenweg 7
09599 Freiberg
Rheine, 03.06.08 i. V. i. A.
Date Reinhard Wibbeling
Engineering Manager
Reiner Banemann
Product Manager