b1 Ba Pressure Gauges Englisch 908

7/28/2019 b1 Ba Pressure Gauges Englisch 908

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ContentsPage Page

1. Scope............................................................................. 1 6. Installation............................................. 7

2. Elastic Elements, Construction o 7. Operation.............................................. 7Pressure Gauges and Chemical Seals................................. 1 8. Maintenance and Repair....................... 8

3. Selection Criteria............................................................ 3 9. Electrical Accessories............................. 84. Accessories.................................................................... 5 10. Storage ............................................... 85. Set-up Options................................................................ 6 11. Installation in potentially explosive areas. 8

1. ScopeThe inormation provided in these Operating Instructions relating to the selection, application, set-up options,installation and operation applies to pressure gauges with an elastic sensing element.

2. Elastic Elements, Construction o Pressure Gauges and Chemical Seals

2.1 Elastic Elements

Bourdon Tube Types:

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Pressure GaugesSelection, Set-up o Measuring Instruments,

Mounting and Operating Instructions

C-Type Bourdon Tube Helical Bourdon Tube

Diaphragm Type:

Horizontal Vertical

Capsule Type:

ARMATURENBAU GmbHManometerstraße 5 • D-46487 Wesel - GinderichTel.: +49 (0) 28 03 / 91 30 - 0 •Fax: +49 (0) 28 03 / 10 35armaturenbau.com • [email protected]

Subsidiary Company, Sales and Export East

MANOTHERM Beiereld GmbHAm Gewerbepark 9 • D-08340 Beier eldTel.: +49 (0) 37 74 / 58 - 0 • Fax: +49 (0) 37 74 / 58 - 545manotherm.com • mai [email protected]



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2.2 Construction o Pressure Gauges

Pressure Gauge with C-Type BourdonTube: Pressure Gauge with Horizontal Diaphragm:

Bourdon tube

Link screw

Pressure Gauge with Diaphragm Capsule Pressure Gauge with Vertical Diaphragm

Diaphragm,

vertical

Processconnection(here) bottomconnection

Processconnection(here) centerback connection

Capsule

Pointer

Movement

Pointer

Dial

Dial

Connecting rod

Movement

Pointer

Dial

Pinion

Stem

(socket)

Hairspringo the movement

Toothed quadrant

Tip o thebourdon tube

Zero dead stop

Link

Upper movement plateOverrangeprotector

Process connection(here) 6 o´clock bottom connection

Diaphragm,horizontal

ConnectingRod

Lower measuringange

Dial

Pointer

Toothedquadrant

Pinion

Uppermeasuringange

Process connection,bottom connection

Pressure Gauge in line with Saety Requirements According to EN 837-1, S3 (ormerly DIN 16 006 Part 1 and Part 2)

Bayonet ring

Full blow-out pressure relie back Case with solid ront Window made

o multilayersaety glass



3. Selection Criteria

In each case the user needs to ensure that the properpressure gauge was selected with respect to indicatingrange and design (resistance o the materials usedagainst the pressure medium, atmosphere and tempe-

rature as well as resistance against overpressures,or example). The regulations valid or the particularapplication as well as EN 837-2 must be observed.

3.1 Principles o measurementThe pressure gauges described in these OperatingInstructions contain components which are subjectedto elastic deormation when exposed to a pressure.This motion is transerred to a movement with a pointer.Because o their ruggedness and simple usage thesepressure gauges are widely used throughout the indu-stry. The elastic elements themselves are generally

made o copper alloys or alloyed steel.

Pressure Gauges with Bourdon TubeBourdon tubes are oval tubes bent into a circular arc.The pressure which is to be measured acts upon theinterior o the tube so that the tube's oval cross sectionbecomes approximately circular. The edge stress pro-duced through this deorming eect causes the arco the Bourdon tube to open. The end o the Bourdontube which is not afxed perorms a motion, this motionbeing a measure or the pressure. For pressureranges up to 40 bar Bourdon tubes bent into a circular-arc over angle o 270 degrees are commonly used,or higher pressure ranges helical Bourdon tubes ha-ving several turns are employed. Bourdon tubes havea relatively low restoring orce. This must be takeninto account when using additional accessories likeindicating pointers, limit switches or potentiometric

transducers since these will aect the readings ob-tained. Pressure gauges with a Bourdon tube cannormally only be protected in a limited way againstoverloading by supporting the elastic element at aspecifc pressure limit.

Bourdon tube pressure gauges o accuracy gradesbetween 0.6 and 2.5 are commonly used or measure-ments in the range between 0.6 bar to 4000 bar. Theinuence o temperature changes on the indicationdepends chiey on the temperature coefcient (TEC= change in stiness caused by change in temperature)that is specifc or the elastic modulus o the Bourdontube. Depending on the material used, the accuracyerror caused by temperatures diering rom the ree-rence temperature will amount to between 0.3 % and0.4 % per 10 K.

Diaphragm Pressure GaugesThe diaphragms are corrugated in circles. The pressu-re is applied to one side o the diaphragm. The degreeo exing is a measure or the pressure. Diaphragmshave a relatively high restoring orce. For this reasonthe inuence o additional accessories is less com-pared to gauges using Bourdon tubes. Through theannular fxing arrangement or the diaphragm it isless sensitive to vibrations. By supportingmeans itis possible to protect the diaphragms against severeoverloading. By means o coatings or oils in ront othe diaphragm, the diaphragm itsel may be protectedagainst corrosive pressure media. Diaphragm gaugesmay be used with advantage also or highly viscousand crystallising pressure media since through ex-tended connection bores, open connection angesor purge holes optimum cleaning conditions may beprovided or..

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2.3 Types o Chemical Seal

Diaphragm Capsule In-line



There exist gauges with a horizontally arrangeddiaphragm and gauges with a vertically arranged dia-phragm, i.e. where the diaphragm is placed in parallelto the dial. Generally or pressure ranges below 0.6 bardiaphragms having a diameter o 160 mm are used orpressure gauges with horizontal diaphragm, whereasdiaphragms having a diameter o 100 mm are usedor higher pressure ranges. Owing to the annular fxingarrangement o the diaphragm the inaccuracy caused

by temperature changes is signifcantly greater compa-red to gauges with a Bourdon tube. Diaphragm pres-sure gauges are applied or pressure ranges between10 mbar up to 25 bar with standard accuracy gradeso 1.6 or 2.5, in exceptional cases also 4.0.

Capsule Pressure GaugesA diaphragm capsule consists o two circular corruga-ted diaphragms or a diaphragm and a base plate joined in a pressure-tight matter at the rim. The pressu-re is introduced at the centre o one o the diaphragmsand acts upon the inside o the capsule. The resulting

movement is a measure or the pressure. Capsulepressure gauges are not suited or liquid pressuremedia. They are available or pressure ranges rom2.5 mbar to 600 mbar in accuracy grades rom 0.6to 1.6. The deviation in the readings in response totemperature changes amounts to between 0.3 % and0.4 % per 10 K depending on the material used.

3.2 Pressure RangesThe operating pressure should be in the mid. third othe pressure range specifed or the gauge. The maxi-mum pressure load should not exceed 75 % o ull

scale value at static loads, or 65 % o ull scale valueor pulsating loads. Reer to EN 837-2.

3.3 Accuracy LimitsThe accuracy limits or pressure gauges have beendefned in EN 837-1 (Bourdon gauges) and EN 837-3 (capsule and diaphragm gauges) (ormerly DIN 16 005).Pressure gauges belonging to grade 0.1 to 0.6 and hig-her are preerably used in laboratories and workshops.Pressure gauges o grades 1.0 and 1.6 are mainlyused or measurements on machines and production

acilities. Pressure gauges belonging to grade 2.5and 4.0 are used in monitoring measurements whereaccuracy requirements are not that high.

3.4 Conditions o UsageWhen selecting pressure gauges the selection criteriaand installation recommendations in accordancewith EN 837-2 (ormerly DIN 16 005 Part 1 and Part 2) as wellas the instructions provided here, especially in para.3.4.1, 3.4.2 and 5. must be observed. The use opressure gauges which do not meet the requirementsencountered in practice can cause great consequentialdamage.

3.4.1 Pressure Media PropertiesMarch o PressureThe actual elastic element must not be exposed sud-denly to rapid pressure changes or pressure spikes.In the case o pressure spikes the pressure limitsspecifed or the gauge must not be exceeded.

I required overload protection means (reer to para.4) must be provided upstream. Pressure changes inexcess o 10 % o the ull scale value per second will

impair the readings. Moreover, this will severely impairthe service lie o the gauges. In such cases attenuatorsmust be provided. Through throttling components(restrictor screw or adjustable snubber) the crosssection at the inlet can be much reduced in order todelay the transmission o the pressure change to thegauge. Fitting o a throttling line (a line with a reducedcross section) ahead o the gauge is also possible. Inboth cases the increased risk o accumulating conta-mination is a disadvantage. Attenuating componentsat the movement will only delay the movement o thepointer. Filling the case with uids will attenuate themovement o the elastic element and will help to reduce

wear on moving parts.

TemperatureI the temperature o the pressure medium at the pointwhere it is measured deviates rom the operating tem-perature specifed or the pressure gauge (reer to para.7 as well as EN 837-1, -2, -3) then a sufciently longmeasuring line, a siphon or a chemical seal with a ca-pillary line must be mounted to the pressure gauge.The inuence on the reading owing to temperaturesdeviating rom +20 °C must be observed.

Highly Viscous, Crystallising and Solids Contai-ning MediaWhen wanting to run measurements on highly viscous,crystallising or solids containing pressure media, theuse o diaphragm or Bourdon tube pressure gaugeswith attached chemical seal (reer to para. 4.4) isrecommended.

Corrosive Pressure MediaI corrosive pressure media can be kept away byseparating means rom the elastic element, then stan-dard gauges may be used. Otherwise the selection oa suitable material is mandatory, whereby the user

must provide to the manuacturer all inormation onthe materials which under the given conditions arecompatible with the pressure medium, reer to EN837-2, 4.3. Because o the restricted choice o ma-terials or the elastic elements, diaphragm pressuregauges with a protective lining will possibly have tobe used, or chemical seals made o pressure mediaresistant materials need to be mounted to a Bourdontube pressure gauge.

SaetyThere is an increased risk combined with gases and

uids under high pressure, or example. In case o de-veloping leaks or bursting o pressurized components,persons in ront o the viewing window o the instru-ment must not be injured by the pressure mediumescaping to the ront.

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Saety pressure gauges with a blow-out device onthe rear, ftted or example with a pressure relie onthe back, will here oer the required degree o protec-tion (reer to the Fig. on the bottom o page 2).When using hazardous pressure media, or example– oxygen– acetylene– combustible substances– toxic substances

as well as rerigerating units, compressors etc.The applicable regulations must be observed. In accor-dance with EN 837-1, 9.7 uid flled pressure gaugesmust be equipped with blow-out devices (designatedS1, or also S2 resp. S3 in according to EN 837-1).

3.4.2 Ambient ConditionsVibrationsI an exposure o the pressure gauge to vibrationscan not be avoided by way o a suitable installation,gauges equipped with damping devices or the move-ment or gauges with a uid flling must be used.

Ambient TemperatureThe accuracy limit given on the dial applies at a ree-rence temperature o +20 °C. Deviating temperaturewill have an inuence on the reading. The magnitudeo the inuence will depend on the principle o measu-rement used (reer to para. 3.1). At outdoor services,the prevailing ambient conditions must be taken intoaccount through the selection o a suitable gauge orby introducing suitable protection means in order toprevent the ormation o ice on the pressure gauge attemperatures below 0 °C, or example. For liquid flledinstruments it has to be considered that the viscosityo the uid will increase as the temperature dropscausing a delayed reading. The ambient temperatureneeds also to be taken into account regarding themaximum allowed operating temperature specifed orthe pressure gauge.

Corrosive AtmosphereFor services at corrosive atmospheres suitable casingsand components made o corrosion resistant materialsmust be provided. Also special surace fnishing mayhelp to protect the outside o the pressure gauges.

4. AccessoriesShut-o Fittings or Pressure GaugesIt is recommended to ft shut-o devices betweenthe measuring point and the pressure gauge. Thiswill allow an exchange o the pressure gauge andchecks on the zero setting while the system remainsoperative.Depending on the application either cocks or valvesare used. Cocks have three positions:– Vent: The supply line is shut-o and the

gauge is connected to the atmosphere.The zero setting may be checked.

– Operation: The supply line is open, the gauge ispressurised.

– Blow-out: The supply line is open, the pressuremedium is allowed to escape into theatmosphere. The gauge is not working.

Holding Devices or the Pressure GaugeI the line to which the gauge is connected is notstrong enough to support it without introducing vibra-tions, then a suitable holding device or the pressuregauge should be provided.

SiphonsUse sufciently long lines ahead o the pressuregauge or siphons to protect the shut-o fttings and

the gauge against being heated up by hot pressuremedia (steam, or example)

Chemical SealsIn the case o aggressive, hot, highly viscous or crystal-lising pressure media, chemical seals may be used asseparating means ahead o Bourdon gauges in orderto prevent the ingress o such pressure media into theelastic element. A neutral uid serves the purpose otransmitting the pressure to the elastic element. The uidmust be selected depending on the measuring range,temperature, viscosity and other inuences. Special

emphasis must be placed on the compatibility o the uidwith the pressure medium. Chemical seals are availablein a variety o dierent types, reer to sketches in para.2.3, whereby the diaphragm seal is most popular. In-lineseals and ange type diaphragm seals must be mountedtogether at works suitable or the ftting position at themeasuring point. The connection between the pressuregauge and the chemical seal must not be separated.Po-tential sources o inaccuracy by installing a chemical sealahead o the pressure gauge need to be considered.

Overpressure Protection FacilitiesI or operational reasons the pressure range o the

gauge had to be chosen below the maximum operatingpressure, overpressure protection devices ahead othe pressure gauge may be used to protect it againsdamages. In the event o pressure spikes the overrangeprotector will shut-down immediatelly, but only gradual-ly at slow rising pressure. The closing pressure whichneeds to be set up thereore depends on the specifcpressure change with time. However, highly viscousand much contaminating pressure media may impairproper operation o the overrange protector or renderthese ineective. Capsule and diaphragm pressuregauges may be so designed that they themselves will

be capable o resisting overpressures (up to a actoro 3, 5 or 10) without additional devices.

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In the case o valves (according to DIN 16 270 andDIN 16 271, or example) a venting screw is usuallyprovided between valve seat and pressure gauge.Venting into the atmosphere must be arranged in away that any persons present close by are not en-dangered by the escaping pressure medium. Potentialhazards to the environment must be avoided. In certainapplications (steam boilers, or example) the shut-oftting must have a test port so that the pressure gauge

can be checked without having to remove it rom thesystem.



5. Set-up OptionsGeneralWell proven measuring arrangements and proposals orcomponents are detailed in VDE/VDI 3512 Sheet 3.Shown in Table 1 is an overview o some arrange-ments.

Pressure Measuring PortsThe pressure measuring port should be located at apoint where the ow is not impaired in any way andwhere constant conditions can be ensured or themeasurements. It is recommended to provide a su-fciently large bore at the point o the pressure measu-rement and to provide some means or shutting thepressure measuring port o.

Measuring LineThe connection between pressure measuring portand pressure gauges is the measuring line. The inside

diameter o this measuring line should be sufcientlywide in order to avoid the risk o blockages. The measu-ring line should have a steady slope (recommendedis a slope o 1:15). With gases as the pressure mediuma drain should be provided at the lowest point and withhigh-viscosity uids a vent should be provided at thehighest point. In the case o gases containing solidsor uids separators should be provided which may bedemounted rom the running system or emptying. Themeasuring line should be designed and ftted in a waythat it will be capable o sustaining the occurring loadscaused by expansion, vibration or thermal eects.

Shut-o FittingsShut-o fttings at the pressure gauge serve the pur-pose o checking the zero setting or exchanging thepressure gauge whi le the system remainsoperational(reer to para. 4).

Pressure GaugeThe pressure gauge needs to be mounted so that itwill not be subjected to vibrations and shocks and sothat the dial can be read easily. When reading the dialparallax errors should be avoided. It must be ensuredthat possibly present blow-out devices o the pressuregauge are not blocked (reer to EN 837-1, 9.7). Thepressure gauge must be arranged in such a mannerthat the temperature o the gauge will not drop belowor exceed the permissible operating temperature ran-ge (reer also to para 3.4.1, and 7). In doing so, theinuences o convection and thermal radiation shouldbe taken into account. Whenever the elastic elemento a pressure gauge will be flled with water or a watermixture the instrument must be protected against rost.Usually the pressure gauge will be ftted with the dialarranged vertically. In all other cases the position indi-cating symbol according to EN 837 (ormerly DIN 16257) applies. A dierence in height between the port at

which the pressure is measured and the pressure gaugewill cause a shit at the beginning o the reading i thepressure medium in the measuring line is o a dierentdensity compared to the ambient air. This shit Dp at thebeginning o the reading results rom the dierence indensity (r

M - r

L) and the dierence in height Dh :

10-5 · ( r M

- r L

) g · Dh

Dp = Shift at the beginning of the reading (bar) r M

= Density of the pressure medium kg/m 3

r L

= Density of the air (1.205 at 20 °C) kg/m 3

Dh = Difference in height m g = Acceleration due to gravity m/s 2

(mean acceleration due to gravity =9.81 m/s2)

The reading is reduced by Dp i the pressure gaugeis located above the pressure measurement port an-dincreased by Dp i below the pressure measurementport.

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Table 1 State o the pressure medium uid gaseous

State o the flling inthe measuring line

uidpartly

degassingully

degassinggaseous

partly

condensed(humid)

ully

condensed

Examples

a) Pressure gauge abovethe measurement port

b) Pressure gauge belowthe measurement port

condensateboilinguids

"liquidgases"

dryair

moist airue gas

water vapour

Arrangements 3, 4, 5, 7, 8 and 11 are to be preerred

1 2 3 4 5 6

7 8 9 10 11



7. OperationShut-o devices may only be opened slowly in orderto avoid sudden pressure spikes during start-up.

Specifed Usage

The usable range or static loads is indicated byon the dial o many pressure gauges (reer toEN 837-1, EN 837-3).Bourdon tube pressure gauges having a nominal sizeo 100, 160 or 250 may be subjected to the respectiveull scale pressure i the load is static. I the pressureload is o a pulsating nature, pressure peaks amountingto only 0.9 o the ull scale pressure are permissible,and or the pressure ranges o 0/2500 bar and 0/4000bar pressures amounting only to 2/3 o the ull scalepressure may be applied. Bourdon tube pressure gau-ges can be overloaded up to 1.3 o their ull scale value(instruments 0/2500 bar and 0/4000 bar can only beoverloaded up to their ull scale value!), Bourdon tubepressure gauges having a nominal size o 40, 50, 60,63, 80 and 72x72 may only be subjected to pressures

up to 3/4 o the ull span i the pressure is static andi the pressure is o a pulsating nature the maximumload is restricted to 2/3 o the ull scale value, and theull scale pressure may be applied only briey.In the case o diaphragm pressure gauges with a verti-cal diaphragm pressures up to the ull scale value maybe applied i static, and i the pressure is o a pulsatingnature, the limit will be 0.9 o the ull scale level.Diaphragm pressure gauges with a horizontal dia-phragm can sustain overpressures up to fve times theirull scale value (custom-built instruments even more),but a pressure o 40 bar must never be exceeded.

Capsule pressure gauges can also be operated at theirspecifed ull scale pressure provided the pressure isstatic. I the pressure pulsates, the maximum load isonly 0.9 times the ull scale value. Just like Bourdontube pressure gauges they are able to sustain over-pressures up to a actor o 1.3 (custom-built instru-ments can handle even higher overpressures).

Zero Check In order to check the zero setting o the pressuregauge during operation o the system, the requiredshut-o device has to be closed (reer to para. 4)

andthe pressure in the gauge has to be relieved.The pointer must come to rest within the zero rangeindicated by | . I the pointer comes to rest outsideo this range then a persisting deormation o theelastic element must be assumed so that the gaugewill have to be checked in order to avoid accidentsowing to incorrect measurements. In such a case thepressure gauge should, or this reason, be replacedand returned to the manuacturer or checking andrepair i required.

6. InstallationThe installation o pressure gauges should be let toskilled sta. As to the measurement arrangement reerto para. 5. During installation or removal never applyany orces to the case o the pressure gauges; insteadapply the wrench to the wrench ats provided. It mustbe ensured that the matching process connection hasbeen selected (nominal width, suitable sealing ace,i required). In order to position the pressure gauge

so that it may be read perectly the use o a clampingsleeve or a union nut is recommended. In the case oange joints the pressure gauge is placed on the matingange and the anges are joined using suitable bolts. Itmust be ensured that the bolts are tightened frmly. The joints must be leaktight. For this reason it is mandatorythat suitable gaskets made o a material resistant to thepressure medium will be used in the connections. Forsealing connections with a parallel thread, or example,at gaskets in accordance with EN 837-1 or profle sealsmust be ftted, or on the other hand the correspondingsealing lens has to be provided in case o a high pres-sure connection. Tapered threads (or example NPT

threads) are sealed o with additional sealants likePTFE tape, or example (reer to EN 837-2)

For pressure gauges with a pressure relie vent oØ 13 mm at the top o the case it is recommended orpressure ranges < 6 bar to cut o the nipple at theflling plug so that the gauge can be vented in orderto compensate the internal pressure. I the pressuregauge is located below the pressure measurementport, the measuring line should be purged well beorestarting operation so as to remove any oreign objectswhich might be present in the line. During pressuretests on pipes or vessels, the pressure gauge must notbe exposed to excessively high pressures as indicated

by the pressure limit indicating mark on the dial,resp. the limits or a static pressure specifed or thepressure gauge must not be exceeded (reer to para.7). When using diaphragm gauges the clamping boltsor the upper and lower ange must not be loosened. Inthe case o instruments with attached chemical sealsthe connection between gauge and chemical seal andpossibly also the connection between chemical sealand capillary line must not be disconnected.

Beore disconnecting and removing the pressure gaugeunit rom the measuring point it must be depressurizedfrst. I required the pressure in the measuring line mustbe relieved. Residues o the pressure medium in pres-

sure gauges which have been removed may presenta hazard to personnel, acilities and the environment.For this reason suitable saety precautions must beintroduced (Electrical accessories: reer to para. 9).

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Wrench ats

Sealing suraceSeal in the thread

Parallel thread Tapered thread



Pressure Range Check I the readings supplied by the pressure gauge needto be checked while the remainder o the system isoperating, the pressure gauge has to be separatedrom the process via the required shut-o device withtest port (reer to para. 4) and a test pressure has tobe applied to the gauge. The error limits according toEN 837-1 resp. EN 837-3 apply.

Operating TemperatureThe permissible operating temperature or the pres-sure gauge must not be exceeded.Temperature resistance resp. the permissible operatingtemperature ranges generally rom -20 °C to +60 °C(reer to EN 837-1 and EN 837-3 ) whereby unflledgauges with a silver-brazed or argon arc welded Bour-don tube are capable o sustaining temperatures up to+100 °C at the actual measuring system. Custom-built designs which are labelled accordingly (tA / tR)may be suitable or higher temperatures.

Note: Here only inormation on the temperature re-sistance o the materials and the soldered joints orwelded seams is provided. The inormation relating toadditional inaccuracies because o deviations rom thereerence temperature must be observed! Cleaning TemperatureAlso when purging the measuring line the permissibleoperating temperature or the pressure gauge (reerto above) must not be exceeded. I required the gau-ge will have to be shut-o or removed. In the caseo pressure gauges with attached chemical sealsthe maximum cleaning temperature tR must not be

exceeded.

8. Maintenance and RepairGenerally pressure gauges will not require any main-tenance. These instruments may only be repaired bythe manuacturer. Beore returning an instrument orrepair all parts o the instrument in contact with thepressure medium must be cleaned with care, especial-ly when hazardous pressure media were used beore(reer also to para. 6). It is a good idea to always inclu-de with the repair order a description o the pressure

medium resp. a Declaration o Contamination.

9. Electrical AccessoriesThe electrical connections should be made only byskilled sta and qualifed personnel. Instrumentsequipped with electric accessories have an adhesivelabel rom which it is apparent how the instrument isto be electrically connected. Load limits must be ob-served.Exceeding o load limits could cause greater damage.During installation, initial operation and operation o the

instruments the national and international saety regu-lations (VDE 0100, or example) must be observed.

It must be ensured that the cable diameters match thenominal widths o the sealing inlets o the cable eed-throughs. Screwed joints must be tightened frmly.

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Compliance with the certifed protection standards canonly be ensured in this way. In the case o designs withright-angled plug connectors, universal plug connec-tors or terminal boxes, the centrally arranged fxingscrews must be tightened manually.

In connection with the DMU type pressure transducersshielded cables must be used throughout, the shieldo which must be connected to housing or the ground

terminal on the right-angled plug connector so as toensure ull electromagnetic compatibility (EMC).

In the case o equipment with a magnetic contact itmust be noted that the CE mark in accordance withEMC guidelines will only apply i a switching requencyo 5 actuations per minute is not exceeded.

Inasmuch specifed, a suitable output unit or multiunc-tional relay must be used (or example or instrumentswith inductive limit switches). The current OperatingInstructions must be observed.

10. StorageWhen keeping pressure gauges in stock beore moun-ting they should be let in the original packaging andshould be maintained in stock well protected againstdamage by external inuences. I the pressure gaugewas taken out o its packaging and inspected briey(or testing, or example) it should be careully placedback in the same packaging beore returning it tostock. While the pressure gauge is in stock the generaltemperature limits o -40 °C and +60 °C should not beexceeded (reer to EN 837-1 and EN 837-3).

I in doubt or i anything remains unclear please get

in touch with the manuacturer.

11. Installation in potentiallyexplosive areas

Pressure Gauges are mechanical pressure measuringinstruments and do not show any ignition sourceswhen operating as intended. Versions that are madeo stainless steel and contain laminated saety glassare suitable or the use in areas o category 2 and 3according to ATEX-Standard 94/ 9/EG.Only pressure measuring instruments with integratedconstruction type proved deagration volume protec-tion, our model Adapt-FS, are suitable or the use ascetegory-1 instrument.This protection system prevents a ame penetrationat deagration o explosive vapor-air, respectively gas-air mixtures o explosion hazardous IIA, IIB and IIC inan upstreamed volume o a maximum o 0.2 l.The deagration volume protection "Adapt-FS" iscertifed

IIG IIC PTM 99 ATEX 4023 X

on condition that the operating pressure does not

exceed 1.1 bar abs. and the operating temperaturedoes not exceed 60 °C (140 °F).

Please contact the manuacturer in case o obscurities

or insecurities.

b1 Ba Pressure Gauges Englisch 908

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