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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] 

5.

      

Calibration data

 

 

Calibration data, type of device and serial number are indicated on the label. Changes of  
medium, pressure and position of mounting will lead to measured value changes. 

 
 

6.

      

Switch-point

 

 

Type DW-P 

The switch-point is fixed by the manufacturer according to 

 

 

customer’s request. Changes can only be maid by the supplier. 

 

 

 

Type DW-N, DW-N-EX 

Alternations/Adjustability of the switch-point can be made by the 

customer    

within the limits indicated on the small scale attached on the 

 

 

backside.  

 

 

 

 

          Type DW-U, DW-U-EX 

Alternations/Adjustability of the switch-point can be made by the 

customer    

within the limits 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 
instruments should be sent in for repair, as they have to be re-calibrated by the manufacturer.  

 

Adjustments of set screws or after for instance replacement of the tension spring or  

 

of the bellows system by the customer cause a change of the calibration.  

 

All guarantee and warranty claims are forfeited hereby. 

 
 

8.

  

Further requirements for device with EX-switch

 

 

The measures specified here must always be applied according to valid technical rules. 

 
 

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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