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Страница 2: ...CONTENTS PAGE NO A General Description 1 B Operating Procedures 3 1 Mechanical Adjustment 3 2 Electronic Adjustment 3 C Notes and Suggestions 6 D Maintenance 7 E Servicing 8 ...
Страница 3: ...cate valve caps boxes valve risers manhole covers etc The major parts of the Model 720 are see Figure 1 1 The Detection Head 2 The Head Swivel 3 The Telescoping Handle 4 The Control Box with a Built In Speaker b Indicating Meter Signal Strength and Battery Condition c Sensitivity Control On Off Switch d Battery Test Push Button e Headphone Jack 5 Pistol Grip 6 Battery Supply Model 720 820 S Valve ...
Страница 4: ...he sensitivity and to compen sate for uneven terrain mineralized ground etc The SPEAKER 720 only produces a tone that enables the operator to pinpoint buried manhole covers valve caps etc The optional headphones on the 720 do the same thing The METER on the 720 has several functions It is an indicator to assist the operator in properly adjusting the instrument It quickly tells the operator if a bu...
Страница 5: ...ing the area 2 Electronic Adjustment a First test the condition of the battery supply Turn the unit ON by turning the SENSITIVITY ON OFF control know clockwise unit until it clicks on Now push the BATTERY TEST PUSH BUTTON and observe the METER A reading anywhere in the green shows that the battery supply is OK b With the unit ON and with the DETECTION HEAD away from any mental objects slowly turn ...
Страница 6: ...far into the dead area then the instrument will be very weak and insensitive Of course if the control is advanced too far during the initial tuning and a signal is constantly pres ent then there will be no charge when the detection head is carried over a manhole cover buffalo box or valve cap e IMPORTANT Remember tune or adjust the instru ment with the detection head at the distance above the grou...
Страница 7: ...objects behind walls See Figure 2B 1 Set the detection head close to the wall and parallel to it 2 Find the dead area and very slowly turn the knob clockwise until the signal is just ready to appear 3 Now sweep the wall keeping the distance from it the same Model 720 820 S Valve Locators 5 ...
Страница 8: ...ll be reached where the signal peaks or is very narrow This is the pinpointing operation and the metal object being detected will be directly under the star decal on the detection head C Notes and Suggestions 1 Remember when initially tuning the instrument to try to find a spot that is relatively free of metal If it is difficult to adjust and signals seem to be very strong move away a few feet and...
Страница 9: ...requently The test can be done quickly and easily while the instrument is being used Even though tuning is usually possible low battery volt ages will result in low sensitivity D Maintenance 1 Both the 720 and 820 S employ solid state circuitry and they use no adjustable tuning coils so routine mainte nance is limited to occasional battery replacement Two transistor type 9 Volt batteries are used ...
Страница 10: ...l 820 S Valve Locator require repair or servicing aside from normal product mainte nance we suggest that you contact the factory at the following address Goldak Inc 15835 Monte Street Unit 104 Sylmar CA 91342 Phone 818 367 0149 Fax 818 833 7694 8 ...
Страница 11: ... product we suggest you a Pack the instrument carefully and secure b Include any accessory items normally used with the instrument c Include a note with the instrument stating the nature of the problem s you have encountered in using the instrument d Include a contact name telephone number and fax number Model 720 820 S Valve Locators 9 ...
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