Metrotech 880B Manuel utilisateur

880B ™

SERVICE CENTER, SALES AND TECHNICAL SUPPORT INFORMATION

Corporate Headquarters Metrotech Eastern U.S. Service Center Metrotech European Service Center

3251 Olcott Street 1824 Murfreesboro Road, Ste. 104 Seba KMT

Santa Clara, CA 95054 Nashville, TN 37217 Dr. Herbert Iann St. 6

800-446-3392 800-624-6210 96148 Baunach, Germany

408-734-1400 Direct 615-366-7323 Direct +49 9544 680

408-734-1415 Fax 615-360-9855 Fax +49 9544 2273 Fax

www.metrotech.com nashville@metrotech.com service@sebakmt.com

sales@metrotech.com

OPERATIONS MANUAL

MAGNETIC LOCATOR

ISO 9001:2000 CERTIFIED

Metrotech has received ISO 9001:2001 Quality Management System Certification.

Metrotech adheres to the quality standard guidelines of ISO 9001:2001 and ensures quality in its

design/development, production, installation, and servicing disciplines.

Metrotech Corporation

3251 Olcott Street,

Santa Clara, CA 95054

Tel: 1.800.446.3392; 1.408.734.1400

Fax: 1.408.734.1415

E-mail: [email protected]

Internet: www.metrotech.com

Rev B: 12/1/2007

Part # 600A095-B

Price: $5.00

TABLE OF CONTENTS

Page

1 Introduction…………………………………………………………… 5

2 Model 880 Equipment………………………………………………… 5

2.1 Standard Equipment……………………………………………. 5

2.2 Technical Specifications……………………………………….. 5

2.3 880B: Controls & Indicators…………………………………... 6

3 Checkout Procedure………………………………………………….. 7

4 Operation……………………………………………………………… 7

4.1 “Signatures” of Different Targets……………………………… 8

4.2 Typical Signatures and Operating Hints……………………….. 9

5 Maintenance…………………………………………………………... 12

5.1 Battery Replacement……………………………………………….. 12

5.2 Service Center Information………………………………………… 12

Warranty……………………………………………………………………… 13

List of Illustrations

Figure Page

2-1 880B: Standard Equipment…………………………….… 5

2-2 880B: Controls and Indicators…………………………… 6

4-1 Typical Peak Reading……………………………………… 7

4-2 Vertical Orientation – Smooth Peak Response………….. 8

4-3 Horizontal Orientation – Sharp Pinpointing Null……….. 8

4-4 Two Readings of Target Depth……………………………. 9

4-5 Dip Slightly and Move Slowly Across Target …………….. 9

4-6 Large Target, Not Strongly Magnetized………………….. 10

4-7 Narrow, Vertical Target, Not Strongly Magnetized……... 10

4-8 Narrow, Vertical Target, Strongly Magnetized………….. 10

4-9 Sloping, Narrow Target, Not Strongly Magnetized……… 11

4-10 Sloping, Narrow Target, Strongly Magnetized………….. 11

5-1 Replacing the 880B Receiver Batteries…………………… 11

1 INTRODUCTION

The Metrotech Model 880B Locator is a highly sensitive and discriminating instrument designed to locate

only buried magnetic (iron and steel) objects, rejecting those objects that are not magnetic, i.e. aluminum

cans, bottle caps, etc. The “fine tuned” sensitivity of the 880B makes it possible to locate magnetic objects

at greater depths.

The Metrotech Model 880B provides utility companies, contractors, engineers or surveyors with a very

sensitive, yet rugged, instrument for rapid location of buried curb stops, property markers, valve boxes,

manhole or vault covers, well casings, and other iron and steel objects. A sensitive, wide-range meter in

combination with a frequency modulated, audio tone, enables the operator to identify subtle magnetic

fields.

The 880B is rugged, lightweight (less than 2 lb.), water resistant and compact. An automatic battery test is

activated when the instrument is turned on.

2 880B EQUIPMENT

2.1 880B Standard Equipment

Standard equipment is listed below and pictured in Figure 2-1.

Model Number Description

880B Ferromagnetic Locator

500D109 Carrying Case

600A095-B Operation Manual

2.2 Technical Specifications

Batteries: Two 9V Alkaline (Neda 1604A)

Battery Life: 50-60 hours depending on temperature extremes

Control: Combination On/Off and Sensitivity Knob

Automatic battery test when instrument turned on

Meter: Indicates signal level and battery condition

Speaker: Approximately 20 Hz idle tone. Tone frequency increases or decreases with

gradient field intensity

Weight: 1 lb. 10 oz. (3/4 kg)

Dimensions: 43”L x 2 ½”W x 1 ½”T

(109 x 6.9 x 3.8 cm)

Temperature:

Operating: 0º F to +122º F (-10º C to +50º C)

Storage: -4º F to +158º F (-20º C to +70º C)

Construction: High Impact UV Resistant Plastic

Figure 2-2: 880B Controls and Indicators

2.3 880B: Controls and Indicators

Figure 2-2 Designation

1METER

The meter needle deflects in response to the presence of a magnetic

field. The higher the needle position, the closer you are to an iron or

iron and steel object.

BATTERY TEST

When the Receiver is turned ON, the needle should move

into the BATT test area of the meter. If it does not, the

batteries need to be replaced.

2 ON/OFF/SENSITIVITY KNOB

Turns instrument on and off.

Adjusts the sensitivity of the 880B to the magnetic field coming from a

magnetic object. Set as low as possible to avoid picking up other

magnetic fields from nearby objects.

3 SPEAKER

Emits an audible tone when 880B is near a magnetic object. The

higher the tone, the closer the object.

3 CHECKOUT PROCEDURE

1) Hold the unit (in a vertical position) 6 – 12 inches above a 10p nail. Turn the

ON/OFF/SENSITIVITY knob to “12 o’clock” position. The unit should display full meter

deflection.

2) If neither the 880B meter nor speaker respond, replace the batteries. See Section 5.1 for battery

replacement instructions. This unit has no other serviceable parts. Return to the factory for

evaluation and repairs if the unit will not perform.

Figure 4-1: Typical Peak Reading

4 OPERATION

The 880B Magnetic Locator locates only those ferrous metals that attract the earth’s magnetic fields, such

as iron, nickel, cobalt and their alloys, as well as magnets, such as magnetic markers. Utility objects that

contain these metals would include PK nails, marker stakes, valve boxes, cast iron pipe, manhole covers

and large iron tanks. It also locates objects that generate their own magnetic field, such as magnets. This

discriminating feature of the 880B simplifies the operator’s search for a specific magnetic target.

The size, shape, depth and orientation of the target object will define the “profile” or “signature” indicated

on the 880B meter.

To operate the 880B:

1) Turn the ON/OFF/SENSITIVITY knob “ON”. An automatic battery test (accompanied by a high

squeal) will take place for two seconds. If the needle stays within the green area on the meter, the

battery is good. If it does not, replace the battery. (See Section 6.1) After the battery test, the

instrument will switch to the operating mode.

2) Turn the ON/OFF/SENSITIVITY knob so that the meter reads in the “SET” position.

3) Hold the instrument in front of you and sweep it from side to side, keeping the end of the

instrument as close to the ground as possible.

4) When the 880B approaches a ferrous target, the audible tone will increase, corresponding to the

increase shown on the meter. See Figure 4-1 on page 6. If there is no indication of a signal,

increase the sensitivity and search the area again.

Note: For the most accurate readings we recommend that you operate the 880B within the range of 40 to

80 on the meter.

4.1 “Signatures” of Different Targets

The following figures illustrate typical 880B responses to common targets. Note the instrument orientation

to the target. With a little experimentation you will become familiar with the “profile”, or “signature” of

each object you are trying to locate.

Figure 4-2: Vertical Orientation – Smooth Peak Response

Figure 4-3” Horizontal Orientation – Sharp Pinpointing Null

Figure 4-4: Two Readings of Target Depth

4.2 Typical Signatures and Operating Hints

You can develop a good sense of target depth by taking two readings from a target – one with the

instrument tip at the ground surface, and one with the end of the 880B four to twelve inches above the

ground. The response to a shallow target diminishes more rapidly than that of a deeper target. See Figure

4-4.

Once a target depth has been estimated, a rough idea of its size can be gauged by the amount of sensitivity

setting needed to read “25” on the meter.

Long and narrow targets provide the greatest response when the instrument is parallel to the target. See

Figure 4-5.

The following figures illustrate typical responses to various objects.

Figure 4-5: Dip Slightly and Move Slowly Across Target

Figure 4-6: Large Target, Not Strongly Magnetized

Figure 4-7: Narrow, Vertical Target, Not Strongly Magnetized

Figure 4-8: Narrow, Vertical, Strongly Magnetized

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