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MAINTENANCE 

TROUBLESHOOTING

Table 6.  

Troubleshooting 

Problem 

Solution 

(check) 

No output 

•  Supply pressure 
•  Clogged orifice 

Leakage 

•  Connections 

Low or improper 
Span adjust 

•  Zero and Span adjust 
•  Low supply pressure 
•  Output leakage 

Erratic operation 

•  DC signal 
•  Loose wires or connections 
•  Liquid in air supply 

To clean the Orifice, use the following procedure: 

1. 

Shut off the valve that supplies air to transducer. 

It is 

not necessary to remove the Transducer from the 
air line. 

2. 

Remove the Orifice Assembly (

6

) from the unit.  For 

more information, see Figure 11. 

3. 

Clean with alcohol and dry with compressed air. 

NOTES:  1. Parts must be completely dry before 

reassembling. 

2. If the standard maintenance procedure 

does not correct the problem, install the 
appropriate service kit. 

WARNING:  Transducer failure could result in output 

pressure increasing to supply pressure 
and possibly causing personal injury or 
damage to equipment. 

LEGAL NOTICE 

The information set forth in the foregoing Installation, Operation and Maintenance Instructions shall not be 
modified or amended in any respect without prior written consent of Fairchild Industrial Products Company.  In 
addition, the information set forth herein shall be furnished with each product sold incorporating Fairchild's unit 
as a component thereof. 

IS-50T7800S

Litho  in  USA

Rev. H 09/05

Содержание T7800 Series

Страница 1: ...DC input signal to a linearly proportional pneumatic output pressure SPECIFICATIONS Minimum Span 3 15 0 2 1 0 20 100 4 20 mA DC 0 10 VDC 1 9 VDC 0 5 VDC 1 5 VDC 20 120 1 5 8 0 150 800 5 0 35 35 3 27...

Страница 2: ...ltage input units TDFI7800 TAFI7800 TDFN7800 TAFN7800 Class I Division 2 Groups A B C and D Class II Division 2 Groups F and G Class III Division 2 NEMA 4X Enclosure Temperature Code T4 TTFI7800 TRFI7...

Страница 3: ...umalloy Inrare cases igntion sources due to impact and friction sparks couldoccur Thisshallbeconsideredwhentheequipment is installed in locations that specifically require Group II category1Gequipment...

Страница 4: ...Installation continued Figure 6 TR7800 Outline Dimensions Figure 5 TD7800 Outline Dimensions Figure 4 TT7800 Outline Dimensions 4...

Страница 5: ...Figure 8 Optional Mounting Kit 19254 1 sold separately Figure 7 Din Rail Mounting Kit 16893 1 included with unit 5...

Страница 6: ...tream to avoid interference with transducer performance The user is responsible for ensuring that the environmentinwhichtheunit isinstalledand the operating gas are compatible with the materials in th...

Страница 7: ...desiredoutputrangeis obtained SPLIT RANGEOPERATION Lo Hi Span Adjustment 1 Set the Lo Hi Span switch to the Lo position for 3 9 psig or 9 15 psig output range and for 4 20 mA input range Set the Lo Hi...

Страница 8: ...Calibrations Adjustments continued Figure 10 T7800CalibrationConfiguration 8...

Страница 9: ...11 1 12 1 13 14 15 16 17 1 18 19 Qty Cover Machining Screw Screw Gasket Nozzle Body Assembly Orifice Assembly Spring Disk Diaphragm Spacer Ring Diaphragm Assembly Foam Block Valve Body Assembly Screw...

Страница 10: ...n with alcohol and dry with compressed air NOTES 1 Parts must be completely dry before reassembling 2 If the standard maintenance procedure does not correct the problem install the appropriate service...

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