Advertisement
Quick Links
Advertisement
Related Manuals for Goldak 720
Summary of Contents for Goldak 720
-
Page 2: Table Of Contents
CONTENTS PAGE NO. A. General Description ......1 B. Operating Procedures ..... . .3 1) Mechanical Adjustment . -
Page 3: General Description
Model 720/820-S Valve Locators A) General Description: The Model 720 Valve Locator is a portable, solid-state, electronic detection instrument. It is used by municipalities, water and gas utilities, contractors, maintenance people, and others to locate valve caps, boxes, valve risers, manhole covers, etc. The major parts of the Model 720 are: (see Figure 1) 1. - Page 4 (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”...
-
Page 5: Operating Procedures
They can be replaced by simply removing the sin- gle screw and the plate at the bottom of the pistol grip. Views of the control panels for the 720 and 820-S instrument are shown in Figure (1). - Page 6 c) To “tune” the instrument for maximum sensitivity, set the detection head flat and as low to the ground as is practical (see section B1-b on page 2). d) The correct operating point is with no tone (meter set at zero) but it must be at the edge of the signal. In other words, no sound, but any clockwise turn of the control will immediately bring in the signal.
- Page 7 Model 720/820-S Valve Locators g) Follow the same rules when attempting to spot an electrical outlet box or other metal 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.
-
Page 8: Notes And Suggestions
h) To localize or pinpoint a valve cap or other object that has been detected and is producing a full signal, slowly decrease the sensitivity (turn control counter-clockwise) without moving or removing the detecting head. At some point the tone will disappear. Now turn it back up only enough to bring the signal back in. -
Page 9: Maintenance
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 and Figure 3 shows where they are located and how they are mounted. -
Page 10: Servicing
E) Servicing: Should the Model 720 or the Model 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... - Page 11 Model 720/820-S Valve Locators We will inform you of any local repair stations in your area or advise you to ship the instrument directly to the factory. If you ship the product, we suggest you: a) Pack the instrument carefully and secure.
Need help?
Do you have a question about the 720 and is the answer not in the manual?
Questions and answers