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Schmidt 

Mess- und Regeltechnik

 

©2014 Schmidt 

Mess- und Regeltechnik

  

Fon 0 67 32 - 91 91 20        Fax 0 67 32 - 96 24 42        [email protected] 

Maintenance measures are to be executed only by qualified persons. 

The exchange of components is only allowed with original spare parts which are also made 
accessible for the use in the ex-area, this is also valid for possible use of lubrication and 
assistance materials.  

The devices are to be cleaned and maintained regularly in the ex-area. The intervals are 
determined by the operator in accordance with environmental claims. 

After service and/or maintenance all removed barriers and advices must be attached in the initial 
position.  

Activity

 

Visual 

examination

 

daily 

Visual 

examination 

monthly

 

Proximity 

examination 

every 3 

months or  

2000 h 

Detailed 

examination

 

every 6 months 

or 4000 h 

Visual control of the 
devices, disposal of dust 

 

Device in general 

 

Examination of the plant 
for leaking 

 

Special measures: 

Observance of the operation manual of the delivered construction groups 

Realization of the manufacturer’s conditions 

 

 
8.7  Troubleshooting

 

 

It is not allowed to make changes on devices operated in explosion endangered areas. Only 
legitimate technical personnel trained specially for this are authorized to carry out repairs on the 
device.    

 

 

8.8  Waste disposal

 

 

The disposal of packaging and used parts has to take place in accordance with the country’s    
regulations where the device is installed. 

 

Close inspection

:

 An examination to identify such defects as e.g. loose screws which are only 

discernible by using access installations like a step or tools, in addition to the aspects of the visual 
examination. Usually, there is no need of opening the housing or switch-

off the equipment’s voltage. 

Detailed examination: 

An examination additionally to the aspects of the close inspection in order to 

discover such defects as e.g. loose connections which are only discernible by opening housings and/or, 
if necessary, using tools and testing facilities. 
  

Operation Manual 
Flowmeter / Flow Control DW-U 

 

Flow monitor after the baffle plate principle for liquids 

Содержание DW-U

Страница 1: ... for liquids Easy switch point adjustment in small scale steps Compulsive motion transfer to a micro switch Hermetic separation from the medium by means of bellows High power handling capacity Insensitive to magnetic fields High resistance to dirt and high operational safety Available for all flow directions Very economical monitoring of large pipes Output signal 0 4 20 mA for type DW U AN Without...

Страница 2: ...Switches and Flow Meters are to be installed directly into a pipe system Make sure that the instruments are installed according to the information given on the type plate The flow direction correlates to the direction of the pipe Inaccuracy of the instrument will result from incorrect mounting 3 2 Flow direction Due to the applied measuring principle the devices are functional only if for the inst...

Страница 3: ...edure arrow All pipes must be free of contaminants 3 4 2 Threaded connection The tube is directly connected to the unit We recommend sealing all threads with PTFE sealing tape Ensure that no excess of tape is left protruding into the pipe 3 4 3 Flange connection With a flange connection the sealing takes place between the device and flange by means of a suitable flat gasket to be provided by the c...

Страница 4: ...ing The max switching capacity is 230V 5A AC 4 2 Connecting Type DW U and DW N Removing the device cover allows access to the four pole terminal block In addition to the micro switch a control lamp is installed This lamp is for optical control of the switch status of the micro switch The required lamp voltage is indicated on the label The max switching capacity is 230V 10A AC Please connect the de...

Страница 5: ...s indicated on the small scale attached on the backside The actual flow is indicated on the large round scale at the front of the unit 7 Maintenance The Paddle Flow Switch Flow Meter DW U are virtually maintenance free In case of mal function first of all check the pipe system for calcification or contaminations For cleaning do not use sharp edged tools and proceed with extreme caution Damaged ins...

Страница 6: ... d In Zone 21 Dust Ex Category 2D at dusts with minimum ignition energy MIE 3 mJ e Usually there is no zone within the measuring tube Here Zone 1 may be set as maximum The qualification regarding the surface temperature is T4 for all gases vapours mists with an ignition temperature 125 C the mentioned devices are no ignition source In the dust EX category the reference temperature is 110 C Other m...

Страница 7: ...ed implicitly Sticking parts e g due to corrosion are not allowed to be removed violently in an EX atmosphere Protection measures against lightning are to be ensured by the operator 8 6 Repair and maintenance Definition of terms according to IEC 60079 17 Service and repair A combination of all activities that are carried out in order to keep an object in a condition or to repair it that it meets t...

Страница 8: ...easures Observance of the operation manual of the delivered construction groups Realization of the manufacturer s conditions 8 7 Troubleshooting It is not allowed to make changes on devices operated in explosion endangered areas Only legitimate technical personnel trained specially for this are authorized to carry out repairs on the device 8 8 Waste disposal The disposal of packaging and used part...

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