Mounting and Operating Instructions EB 6116 EN. System Electropneumatic Converter for direct current signals i/p Converter Type 6116

Transcription

1 System 6000 Electropneumatic Converter for direct current signals i/p Converter Type 6116 Fig. 1 Type 6116 Mounting and Operating Instructions EB 6116 EN Edition September 006

2 Contents Contents Page 1 Description Application Versions Technical data Principle of operation Installation Mounting position Mounting Electrical connection Pneumatic connection Operation Checking zero point and span Maintenance Cleaning the throttle Servicing explosion-protected devices Positioner attachment Principle of operation Installation Mounting position of the converter Electrical connection Pneumatic connection Operation Troubleshooting Dimensional drawing Certificates EB 6116 EN

3 Safety instructions The devices may only be mounted, started up or serviced by fully trained and qualified personnel, observing the accepted industry codes and practices. Make sure employees or third persons are not exposed to any danger. All safety instructions and warnings in these mounting and operating instructions, particularly those concerning assembly, start-up and maintenance, must be observed. Explosion-protected versions of this converter may only be operated by personnel who have undergone special training or instructions or who are authorized to work on explosion-protected devices in hazardous areas. Refer to section 5 on Servicing explosion-protected versions. Any hazards which could be caused in the device by the signal pressure are to be prevented by means of the appropriate measures. Proper shipping and appropriate storage of the device are assumed. Note! The device with the CE marking fulfills the requirements of the Directive 94/9/EC and the Directive 89/336/EEC. The declaration of conformity is available on request. EB 6116 EN 3

4 Article code Article code Type x x x x x x x x x x x x x x x Explosion protection Without 0 Intrinsically safe II G EEx ia IIC T6 acc. to ATEX and GOST 1) ) 1 Flameproof II G EEx d IIC T6 acc. to ATEX and GOST 3) Explosion proof acc. to CSA and FM standard 4) 5) 3 Intrinsically safe acc. to CSA and FM standard 1) 4) 4 Explosion proof Ex d IIC T6 IECEx TSA/AUSEx (Australia) 4) 6) 5 Intrinsically safe Ex ia / Ex n IIC T6 IECEx TSA (Australia) 1) 6 Ex d IIC T6 acc. to JIS standard (Japan) 4) 7 3 i/p module Type ) Type Input 4 to 0 ma 4 to 1 ma 1) 1 to 0 ma, without switch-off electronic 1) 7) 0 to 0 ma, without switch-off electronic 7) Output Special range: 8) 0. to 1.0 bar 3 to 15 psi 0.4 to.0 bar 6 to 30 psi Initial value 0.1 to 0.4 bar; span 0.75 to 1.00 bar Initial value 0.1 to 0.4 bar; span 1.00 to 1.35 bar Initial value 0.1 to 0.4 bar; span 1.35 to 1.81 bar Initial value 0.1 to 0.8 bar; span 1.81 to.44 bar Initial value 0.1 to 0.8 bar; span.44 to 3.8 bar Initial value 0.1 to 0.8 bar; span 3.8 to 4.4 bar Initial value 0.1 to 1. bar; span 4.4 to 5.94 bar Initial value 0.1 to 1. bar; span 5.94 to 8.00 bar Operating direction Increasing/increasing 1 Increasing/decreasing 1) Electrical connection Pneumatic connection Degree of protection ½ - 14 NPT M0 x 1.5 Without (for positioner attachment) 9) ¼ - 18 NPT ISO-8/1 - G ¼ Without (vent for positioner attachment) IP 54 IP 65 NEMA 4 10) Output pressure gauge Without 0 With 1) 1 Temperature range T min 5 C (Type 6109 standard) T min 45 C (Type 611 subjected to routine test) T min 40 C (Type 611 standard) Special version: None EB 6116 EN

5 Article code 1) Not for positioner attachment ) With degree of protection IP 54/IP 65 only 3) Output pressure max. 5.6 bar; supply air 6 bar 4) Only with 0. to 1 bar/3 to 15 psi 5) With ½ NPT electrical connection, degree of protection NEMA 4 or positioner attachment 6) With ½ NPT electrical connection, degree of protection IP 65 or positioner attachment 7) Without switch-off electronic function and without potentiometer for zero point and span correction 8) Specify setting range, e.g. set to 0.1 to 4 bar; output pressure max. 8 bar 9) Without explosion protection or with EEx d or explosion proof according to CSA/FM 10) Only with explosion proof or intrinsically safe according to CSA/FM Accessories Mounting on Order no. Wall and pipe mounting Mounting to Type Mounting to Type Mounting to Type Mounting on cast yokes acc. to NAMUR Mounting on valve with rod-type yokes acc. to NAMUR Pressure gauge retrofit Pressure gauge: Pressure range 0 to 1. bar Pressure gauge: Pressure range 0 to 6 bar Pressure gauge: Pressure range 0 to 10 bar For all pressure gauges: Screw fitting EB 6116 EN 5

6 Description 1 Description 1.1 Application The devices are used to convert a direct current input signal into a pneumatic output signal for measuring and control (proportional valve). They are especially suitable as intermediate members between electrical measuring devices and pneumatic controllers, or between electrical control devices and pneumatic control valves. The input is a load-independent direct current (e.g. 4 to 0 ma) and the output is a pneumatic signal, for example, 0. to 1 bar (3 to 15 psi) or signal ranges up to 8 bar (116 psi). Type e p TROVIS 6493 Supply air Type Versions Versions for non-hazardous areas: Type Versions for hazardous areas: Type II G EEx ia IIC T6 according to ATEX and GOST Type II G EEx d IIC T6 according to ATEX and GOST Type Explosion proof according to CSA/FM standard Type Intrinsically safe according to CSA/FM standard Type Explosion proof according to IEC Type Intrinsically safe according to IEC Type Ex d JIS Other versions Type 6116-xxxxxxxxxx...: Temperatures down to 45 C Type AS-Interface connection with slave (Type 6150) Voltage input (e.g. 0 to 10 V) with Type 6151 u/i Module Electropneumatic converter without booster or switch-off electronic function Converter can be combined with SAMSON Type 3760, Type (index.0 or higher) and Type 4765 Pneumatic Positioners (refer to section 6). Type 6116-xx : Attachment to p/p positioner (½ NPT) Type 6116-xx : Attachment to p/p positioner (M0 x 1.5) 6 EB 6116 EN

7 Description 1.3 Technical data Type without explosion protection -1/-/-3/-4/-5/-6 with explosion protection 1) Input Load impedance Output Special ranges with Type 611, adjustable according to customer requirements *) The maximum possible output pressure is 8 bar. Air output capacity ) Supply air Air consumption Performance Hysteresis 4 to 0 ma, other signals on request. Minimum current > 3.6 ma 6 V (corresponding to 300 Ω at 0 ma) in standard version 7 V (corresponding to 350 Ω at 0 ma) in Ex ia version Version without switch-off electronic function or calibration electronics R i = 00 Ω± 7.5 % 0. to 1 bar (3 to 15 psi) with Type 6109 i/p Module 0.4 to bar (6 to 30 psi) with Type 611 i/p Module Output range = Initial value + span Δp corresponds to Module to 0.4 bar to 1.0 bar Module A 0.1 to 0.4 bar to 1.35 bar Module B 0.1 to 0.4 bar to 1.81 bar Module C 0.1 to 0.8 bar to.44 bar Module D 0.1 to 0.8 bar +.44 to 3.8 bar Module E 0.1 to 0.8 bar to 4.4 bar Module F 0.1 to 1. bar to 5.94 bar Module G 0.1 to 1. bar to 8.0 bar Module H 1).0 m³/h at an output of 0.6 bar (0. to 1 bar).5 m 3 /h at an output of 1. bar (0.4 to bar) 8.5 m 3 /h at an output of 5 bar (0.05 to 8 bar) At least 0.4 bar above the upper signal pressure range value, maximum 10 bar without upstream pressure regulator, max. 6 bar with devices in EEx d version 1) 0.08 m 3 n /h at 1.4 bar 0.1 m 3 n /h at.4 bar Max. 0.6 m 3 n /h at 10 bar Characteristic: Output linear to the input 0.3 % of final value, more accurate specifications on request Deviation from 1 % of final value at terminal-based conformity, terminal-based conformity more accurate specifications on request Influence in % from the final value Supply air: 0.1 %/0.1 bar ) Alternating load, supply air failure, interruption of the input current: < 0.3 % Ambient temperature: Initial value < 0.0 %/ C, measuring span < 0.03 %/ C Load characteristic ±0.350 m 3 n /h Dynamic performance Limiting frequency: 5.3 Hz Phase shift: 130 (acc. to IEC 770 at 0. to 1 bar) Variable position Max. 3.5 % depending on mounting; ±1 % when mounted horizontally with Type 6109 max. 1 % depending on mounting; ±1 % when mounted horizontally with Type 611 (after mounting Type 611, zero point needs to be readjusted) Storage temperature 45 to 80 C Operating temperature Degree of protection IP 54/IP 65/NEMA 4 Weight Approx kg With Type 6109: 30 to 70 C 3) With Type 611: 40 to 70 C 3) 4) 30 to 60 C 1) 40 to 60 C 1) 4) 1) Refer to EC Type Examination Certificate for details 3) Devices without explosion protection ) Measured with m hose 4 x 1 mm acc. to IEC 770 4) Special version down to 45 C; temp. range on request EB 6116 EN 7

8 Description Version for positioners: Type 6116-xx xxxx/ Type 6116-xx xxxx Input 4 to 0 ma, other signals on request, internal resistance approx. 00 Ω at 0 C Output 0. to 1 bar for positioner Other data same as standard version 1 Balance beam Plunger coil 3 Permanent magnet 4 Zero point and span adjusters (not in version without electronics) 5 Switch-off electronic function: Slide switch (only 4 to 0 ma version with electronics) 6 Flapper plate 7 Nozzle 8 Volume booster 8. Fixed restrictor 9 Sleeve 10 Diaphragm Type 6109/ Type 611 i/p Module Fig. Functional diagram 8 EB 6116 EN

9 Description 1.4 Principle of operation Fig. The device consists of an i/p converter module and a connected volume booster. The supplied direct current i flows through the plunger coil () located in the field of a permanent magnet (3). At the balance beam (1), the force of the plunger coil, which is proportional to the current, is balanced against the force of the dynamic back-pressure. The back-pressure is produced on the flapper (6) by the air jet leaving the nozzle (7). The supply air (SUPPLY 8) flows into the lower diaphragm chamber of the booster (8); a certain amount of this air determined by the diaphragm position flows past the sleeve (9) to the output (OUTPUT 36) of the converter. When the input current and thus the force at the plunger coil increases, the flapper plate (6) moves closer to the nozzle (7). This causes the back pressure and the cascade pressure p K forming upstream of the restrictor (8.) to increase. The cascade pressure increases until it is equal to the input current. When the cascade pressure increases, the diaphragm (10) and the sleeve (9) are pushed downwards causing the supply air to increase the output pressure p A until a new state of equilibrium is reached in the diaphragm chambers. When the cascade pressure drops, the diaphragm moves upwards and releases the sleeve. The output pressure p A can pass through the sleeve to be vented (EXHAUST port) until a new state of equilibrium is reached. Switch-off electronic function Converters with an input range of 4 to 0 ma are equipped with a slide switch which activates the switch-off electronic function. This function allows the input signal to be set to 0 ma if it falls below 4.08 ± tolerance. This causes the pneumatic output to be vented to approximately 100 mbar. This guarantees, for example, the tight shut-off function of a valve. If the characteristic line does not pass through zero like, for example, for an allocated output signal from 0.8 to.7 bar, then the pneumatic output is vented to a remaining pressure of approx. 0.3 bar when the switch-off electronic function is activated bar bar With an output of 0. to 1 bar Remaining pressure of approx. 0.1 bar ma With an output of 0.8 to.7 bar Remaining pressure of approx. 0.3 bar ma Fig. 3 Switch-off electronic function and remaining pressure EB 6116 EN 9

10 Installation Installation.1 Mounting position The converter is to be mounted horizontally with the pressure gauge (or stopper plug) facing upwards. If a different mounting position is used, the zero point must be readjusted as described in section 3.1. For devices with a degree of protection IP 54, it is essential to direct the EXHAUST port for venting downwards to face the floor.. Mounting The converter can be mounted to a wall, a pipe or directly to a control valve as illustrated in Fig. 4. The following accessories are required: Order no for wall and pipe mounting Order no for attachment to valve with cast yoke) Order no for attachment to valve with rod-type yoke Wall and pipe mounting View onto the device Side view Valve with cast yoke/ rod-type yoke mounting View onto the device Plate 3 Rail 4 M6 x 16 screw 5 M6 x 5 screw 6 Lock washer B6 7 A6.4 washer 8 M8 nut 9 A8.4 washer 10 M8 x 5 screw 11 Clamp 1 Clamp 13 Wall or pipe bracket Mounting onto a valve with rod-type yoke Yoke bracket Fig. 4 Installation 10 EB 6116 EN

11 Installation.3 Electrical connection As far as the electrical installation of the device is concerned, the relevant national regulations governing the installation of electrical equipment and the national accident prevention regulations of the country of destination must be adhered to. In Germany, these are the VDE regulations and accident prevention regulations of the employer's liability insurance. For installation in hazardous areas, the following standards apply: EN : 003 (VDE 0165 Part 1/8.98) "Electrical apparatus for explosive gas atmospheres" and EN (VDE 0165 Part /11.99) "Electrical apparatus for use in the presence of combustible dust". For the interconnection of intrinsically safe electrical equipment, the permissible maximum values specified in the EC type examination certificate apply (U i or U o ; I i or I o ; P i or P o ; C i or C o, and L i or L o ). Note! It is absolutely necessary to keep to the terminal plan specified in the certificate. Reversal of the electrical connections may cause the explosion protection to be ineffective! Screw off the cover of the housing and connect the wires for the input signal to the terminals 11 (+) and 1 ( ) using suitable cable glands or connectors. No additional voltage supply is required. Secure grounding conductor at the ground terminal located either inside or outside the housing. EEx d versions must be connected with an approved metal cable entry (certificate of conformity) or a seal box tube. Approved versions (certificate of conformity) are equipped with permanently sealed cable entries. green/yellow 4 to 0 ma input Fig. 5 Electrical connection EB 6116 EN 11

12 Operation.4 Pneumatic connection The connections for supply air (SUPPLY 8) and output air (OUTPUT 36) are designed as bore holes with either G ¼ or ¼-18 NPT threaded connections (see page 0). Customary screw glands for metal pipes or plastic hoses can be used. Supply air (see technical data on page 7) Min bar above the upper signal pressure range value Max. 10 bar Max. 6 bar for Type (see page 6) Note! The supply air must be dry and free of oil and dust. The maintenance regulations for connected reducing stations must be observed. Blow out all air connections before attachment. Note! When extending the exhaust by connecting a pipe either to the exhaust angle piece or directly to the G or NPT connection, make sure that no water can enter at the end of the pipe. The pipe must have a sufficiently large cross-sectional area of at least 8 mm² = 6 mm inside diameter. 3 Operation 3.1 Checking zero point and span The device converts the input signal proportionally into the output signal. The signal ranges are specified on the nameplate. In case of a mounting position that is not horizontal or when the pressure gauge/ stopper plug does not face upwards, zero and span can be corrected by approx. 10 % using the electronics. To do this, proceed as follows: 1. Screw off the cover to access the ZERO and SPAN potentiometers on the circuit board.. Connect a pressure gauge (minimum accuracy class 1) to the converter output. 3. Set the supply air to 0.4 bar above the upper range value of the output signal and apply it to the device. 4. Deactivate the switch-off electronic function at the slide switch (5). Checking the zero point 5. Set the input signal to the lower range value with a suitable current source (e.g. for range 4 to 0 ma = 0. to 1 bar, set to 4 ma). The output signal of the pressure gauge should now indicate 0. bar. If this is not the case, readjust the zero point accordingly with the ZERO potentiometer. 1 EB 6116 EN

13 Operation Checking the span 6. Set the input signal to 0 ma (upper range value) using a suitable current source. The output signal at the pressure gauge should now indicate 1.0 bar. If this is not the case, readjust the span accordingly with the SPAN potentiometer. 7. Change the input signal abruptly from 0 to 0 ma (or tap gently the converter) and check whether the output signal assumes the upper range value of 1.0 bar. Note! As the adjustment of zero and span influence each other, recheck both values and correct them, if necessary. Electric terminal Zero point and span adjusters Switch for switch-off electronic function Fig. 6 Zero point and span correction Zero adjustment for special versions with an input signal of 0 to 0 ma. These versions do neither have potentiometers to adjust zero or span, nor the switch-off electronic function. The zero point can only be adjusted mechanically at the zero adjustment screw (1.1) of the i/p module. Caution! Never open devices with explosion-proof enclosures when the electrical power supply is connected; observe explosion protection regulations! Damage to the cover's thread and/or the connecting thread result in the immediate loss of EEx d protection. EB 6116 EN 13

14 Maintenance 4 Maintenance There are no specific maintenance measures to be carried out. To guarantee trouble-free operation of the converter, make sure that the supply air is always pure and clean. Air filters and separators of the connected pressure reducing station need to be checked at regular intervals. 4.1 Cleaning the throttle The throttle (see dimensional drawing on page ) is located inside the housing. It can be accessed from the back of the device. It can be taken out after the screw plug (Ø10) has been removed. When the output signal is too small or when there is no output signal at all, the throttle might be blocked. To remove all blockages, take the filter out of the throttle and clean or replace it. Filter Order no Throttle with filter Order no In addition, the pneumatic connections have filters with plastic rims (order no ) which can be removed for cleaning. 5 Servicing explosion-protected devices If a part of the device on which the explosion protection is based needs to be serviced, the device must not be put back into operation until an expert has inspected it according to explosion protection requirements, has issued a certificate stating this or given the device a mark of conformity. Inspection by an expert is not required if the manufacturer performs a routine test on the device prior to putting it back into operation. The passing of the routine test must be documented by attaching a mark of conformity to the device. Explosion-protected components may only be replaced by original, checked components from the manufacturer. Devices that have already been used outside of hazardous areas and are intended for use in hazardous areas in future must comply with the safety demands placed on repaired devices. Prior to operation, they must be tested according to the specifications stipulated for "Repairing explosion-protected devices". 14 EB 6116 EN

15 Positioner attachment 6 Positioner attachment Analog positioners with Ex d explosion protection can be implemented by combining p/p positioner with a Type (Ex d) Converter. In the Type 6116 Converter designed for positioner attachment, the connection to the positioner is used in place of the booster. Another application involves upgrading p/p positioners to Electro pneumatic positioners (current signal input instead of the pneumatic signal). Type 6116-xx xxxx with ½ NPT threaded connection and Type 6116-xx xxxx with M0 x 1.5 threaded connection 6.1 Principle of operation The supplied direct current i flows through the plunger coil () located in the field of a permanent magnet (3). At the balance beam (1), the force of the plunger coil, which is proportional to the current, is balanced against the force of the dynamic back-pressure. The back-pressure is produced on the flapper (6) by the air jet leaving the nozzle (7). The supply air for the nozzle is taken from the pneumatic positioner (connection to the pneumatic input signal input signal 7). i/p converter module Positioner Type Balance beam Plunger coil 3 Permanent magnet 6 Flapper plate 7 Nozzle 8 Adapter (3766) 9 Adapter 10 O-ring Input signal 7 Supply air 11 Exhaust 13 Flame protection filter 14 Throttle with air supplied over the positioner Fig. 7 Functional diagram of version for positioner EB 6116 EN 15

16 Positioner attachment 6. Installation The following mounting accessories are required for attachment to a positioner: Type Positioner (model index.0 and higher) Direct attachment to the positioner acc. to Fig. 8 (for positioner with M0 x 1.5 electrical connection): Order no , for older positioner models with PG 13.5: Order no Type 4765 Positioner NAMUR attachment to the yoke of a control valve acc. to Fig. 9: Order no Type 3760 Positioner Attachment to the yoke of the Type 3510 Micro-flow Valve according to Fig. 10 or to the NAMUR rib: Order no Mounting position of the converter The converter is to be mounted horizontally using the adapter with the cable entry facing sideways away from the positioner or facing away from the control valve. Make sure the O-ring (10) to seal the converter housing is inserted correctly. 6.3 Electrical connection Connect as described in section.3 and Fig Pneumatic connection Note! Generally, the pneumatic connection of the i/p converter is established by connecting it to the pneumatic input of the positioner. If attached directly to the Type Positioner (Fig. 8), the converter is connected via the bored screw with grommet (6) and the threaded bushing (5). The second screw (7) is used to vent the converter over the positioner housing. Before attaching the adapter (8) to the positioner, the M0 plug and the connecting nipple (input signal) must be removed. For Types 4765 and 3760 Positioners (Fig. 9 and 10), the 1 8 NPT threaded connection of the adapter (9) needs to be fitted with an appropriate cable gland and must be connected to the input connection (input signal 7) of the positioner with a pipe or hose. Try to keep the connection as short and small as possible, e.g. 6 x 1 cross section. The second bore (G ¼) serves as vent and needs to be equipped with the vent plug (11) included in the accessories. For all positioners, the connecting plate (1) must be removed from the bottom of the housing together with the sealing element (1.1) and replaced with the parts delivered as accessories. Make sure that the sealing element is positioned correctly. The filter must be located in front of the throttle belong to the connecting plate. 16 EB 6116 EN

17 Positioner attachment For Types 4765 and 3766, attach the silicone hose (4). For Type 3760, put on the cap (4) included in the accessories. Refer to the mounting and operating instructions of the corresponding positioner concerning the connections for supply air (SUPPLY 8) and output (OUTPUT 36). 6.5 Operation Any adjustments to assign the travel of the control valve to the electric input signal must be made at the positioner separately from the converter module. The necessary steps are described in the corresponding mounting and operating instructions. EB 6116 EN 17

18 Positioner attachment Accessories Connecting plate 1.1 Sealing element 1. M3 x 16 screw 4 Hose 5 Threaded bushing 6 Screw with grommet 7 Screw 8 Adapter 8.1 M4 x 1 screw 8. M4 x 40 screw 10 O-ring Fig. 8 Direct attachment with Type 3766 Positioner 18 EB 6116 EN

19 Positioner attachment Accessories Connecting plate 1.1 Sealing element 1. M3 x 16 screw 4 Hose 9 Adapter 9.1 M4 x 1 screw 9. M4 x 40 screw 9.3 M4 x 55 screw 10 O-ring 11 Vent plug i/p converter Positioner Fig. 9 NAMUR attachment on the control valve with Type 4765 Positioner EB 6116 EN 19

20 Positioner attachment Accessories Connecting plate 1.1 Sealing element 1. M3x 16 screw 4 Cap 9 Adapter 9.1 M4 x 1 screw 9. M4 x 40 screw 9.3 M8 x 55 screw 10 O-ring 11 Vent plug 1 Hex bolt (not required for mounting to a NAMUR rib) Positioner opened Fig. 10 Attachment to micro-flow valve with Type 3760 Positioner 0 EB 6116 EN

21 Troubleshooting 7 Troubleshooting Problem Possible cause Countermeasure Comments No output signal despite changing the input signal Supply air not connected Incorrect terminal assignment Check supply air connection, see section.4. Connect + and terminals correctly, see section.3 Caution! i/p converter does not need any extra voltage! Do not connect 4 V DC! i/p converter constantly vents off air loudly Incorrect input signal Connect correct signal See nameplate: 0 0 ma or 4 0 ma Connections for supply air and output at the i/p converter mixed up Check pneumatic connection, see section.4 i/p converter does not reach 100 % output e.g. 0 ma input: Output only 70 % instead of 100 % Supply air is too low Input signal faulty Supply air must be 0.4 bar greater than the max. output signal (supply air = 0.4 bar) Check whether the input signal at the terminals reaches 100 % (100 % is in standard version, e.g. 0 ma, with split-range 1 ma) See nameplate: Output 0. 1 bar > Supply air at least 1.4 bar Caution! i/p converter has a load of max. 6 V (standard version) max. 7 V (type of protection Ex ia) Check specification concerning control. EB 6116 EN 1

22 Dimensions in mm Wall and pipe mounting, order no Pressure gauge M0 x 1.5/ ½-14 NPT for electrical connection EXHAUST (IP 65) Pipe mounting SUPPLY Attachment to valve with cast yoke order no Wall mounting OUTPUT Attachment to valve with rod-type yoke order no View from the back, without mounting parts Throttle EXHAUST (IP 54) OUTPUT Pressure gauge M6, 10 deep Type 6116-xx10101x000xxxx for positioner attachment Combination with Type Positioner Accessories order no Attachment acc. to NAMUR for Types 4765 /3760 Accessories no. Type 4765: Type 3760:

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28 Type 6116 i/p Converter, EC Type Examination Certificate PTB 98 ATEX 104 X PTB considers the change in the permissible supply pressure from.5 bar to maximum 6 bar does not have any effect on safety. However, PTB recommends adding a copy of this fax to every device. The above mentioned change is to be added with reference to this fax for any possible change to the EC Type Examination Certificate for the associated device at a later date. 8 EB 6116 EN

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