Eputec 7905 Maintenance and service guide

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Static Meter
MODEL 7905 –DIGITAL STATIC METER INSTALLATION & MAINTENANCE
The Model 7905 Static Meter allows easy one-hand operation for field use. Accurate, sensitive and responsive,
the meter is extremely simple to operate and shows both the intensity and polarity of static charges on surfaces
without touching them.
In most cases, static discharges are destructive and/or potentially harmful. Dust clinging to product, materials
jamming or tearing, product clinging to itself and hazardous sparks or shocks to personnel are just a few of the
many problems associated with static. The Model 7905 Static Meter is an indispensable tool for detecting static
charges and finding the exact point where the static is generated. EXAIR Corporation manufactures static
eliminators or “ionizers” that neutralize static and eliminate associated static problems. See the Static Elimination
section in the EPUTEC Catalog or contact an Application Engineer 08191 / 91 51 19-0, or inf[email protected].
GENERAL
The Model 7905 Static Meter is a high quality, portable, non-contacting static meter which will produce years of
trouble-free operation. It will indicate surface voltage and polarity on objects up to ± 20kV at a spacing of one
inch with an accuracy of 10% full scale. Also featured are a pushbutton to hold readings and automatic power
down to conserve the battery.
The accuracy is dependent upon three factors:
The instrument must be properly zeroed.
The distance from the front edge of the case to the target or surface under examination must be
accurately defined.
The target must be large relative to the measurement distance. It should be at least 5" x 5" (127mm x
127mm) for true accuracy.
SPECIFICATIONS
Range: 0 to ± 20 kV at 1" (25mm)
Distance: The meter reads true at 1" (25mm)
from the test surface
Accuracy: ± 10% of full scale
Power: (1) 9 volt battery
(Eveready 216)
Size: 4.14" (105mm) long,
2.4" (61mm) wide,
1" (25mm) thick
Color: Black
Weight: Approximately 1/4 pound
(113 grams)

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Static Meter
OPERATION
1. Press the “POWER ON/HOLD” button and release.
2. Discharge your body by touching a grounded, conductive object such as a water pipe, metal electrical
conduit, grounded machinery or workbench. Alternatively, the operator may wear a grounded wrist strap or
place one around the instrument. The case of the static meter is conductive and is the reference for the
measurement.
3. Face the static meter away from the charged objects. Depress and release the “ZERO” button twice. The
instrument may also be zeroed by pointing it toward a known grounded surface (such as the palm of the
opposite hand) and depressing the “ZERO” button twice. Although you must be careful not to contact the
recessed electrode, the amount of spacing between the electrode and the target is not critical when zeroing
the static meter.
4. Point the sensor plate toward the target and move to a spacing of one inch between the edge of the case
and the target. Note the meter reading. To hold the reading, press and hold the “POWER ON/ HOLD”
button.
A source with a negative polarity will show a minus (-) sign in the display. A positive source will display no sign.
NOTE: If you approach the target and the indicated field strength begins to exceed 20kV at a
distance greater than 1" (25mm), STOP! This implies that the target voltage may be high enough
to create an arc.
Proceed with caution.
5. Repeat the above for additional measurements.
6. The instrument will automatically shut off after about 1 minute from the time the “POWER ON/ HOLD”
button is last activated.
WARNING: DO NOT POINT STATIC METER DIRECTLY AT ELECTRICAL IONIZER AT CLOSE RANGE OR
YOU MAY SEVERELY DAMAGE THE STATIC METER.
FOR ACCURATE READINGS:
1. Always read at 1" (25mm) away from the target surface.
2. The sensing electrode of the static meter is very sensitive. Do not let materials contact the sensor orifice.
Inaccurate readings or damage to the meter may result.
3. Zero the meter between readings. Keep in mind that some articles of clothing worn by the person using the
meter might have static charges which can affect the meter readings.
4. Never point the sensor at an ionizer. This can permanently damage the sensitive electronics of the meter.
Always measure the charge on the surface of the material. If an ionizer is used on a material, the treated
surface should produce a “zero” reading.
NOTE: At rest, few objects will show a charge unless recently rubbed against another surface or if separated
from a surface. To illustrate this, read the charge on a roll of cellophane tape. Now unroll a bit. Note that the
unrolled portion has a positive charge, while the surface from which it separated has a negative charge. The
Model 7905 Static Meter will help you find and isolate the point(s) where the static charge is generated. An
EXAIR Static Eliminator located at the point after the material has received its charge can instantly neutralize
the charged surface. If that surface is subjected to additional friction, it may build up another static charge and
additional static eliminators may be required.
BATTERY REPLACEMENT
The unit should be off while replacing the battery. Normal battery life is about 200 hours of use. The battery
should be replaced when the “BAT” indicator appears on the display for 5 seconds or more. Recommended
replacement is once a year. (Dead battery voltage is approximately 7.2 volts.) Replacement type is Eveready
#216 or equivalent NEMA 1604.Remove the battery when storing the static meter for an extended period of
time.
CLEANING
If excessive drift is noted, the surface of the electrode may require cleaning. Wipe the surface with a soft cloth
saturated with clean alcohol and allow to dry thoroughly. Dust off any lint.
If you have any questions or problems, please contact

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Static Meter
EPUTEC Drucklufttechnik GmbH.
Haidenbucherstr. 1
86916 Kaufering
Tel. 08191 / 91 51 19 0
Fax 08191 / 91 51 19 19
[email protected]
www.eputec.de
EXAIR Ion Air Gun is UL
Component Recognized to U.S.
and Canadian safety standards.
Power supplies are UL Listed to
U.S. and Canadian safety
standards. There are no user
serviceable parts inside.
Power Supplies meet the
requirements of applicable
European Directive(s).

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Static Meter
Stand: 03/2015, LIT 7001