281 ADVANCEDENERGY | Alldatasheet
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©2020 Advanced Energy Industries, Inc. The Monroe 281 Static Locator is a high quality, portable non-contacting static meter which produces consistently accurate readings with ease and of fers 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% of reading. The Monroe 281 also features a push button to hold readings and automatic power down to conserve its battery. PRODUCT HIGHLIGHTS Perfect for checking effectiveness of work station grounding systems Precise, easy-to-read digital display Hold button freezes display to capture transients or for hard-to-read locations Battery SavR™ turns instrument off when not in use Pocket-sized convenience RoHS compliant TYPICAL APPLICATIONS “Static-free” workstations: for frequent checks of grounding straps, mats and similar Converting, printing, laminating, or coating operations: to spot static buildup before it spots your product or jams your line Normal Range ±20kV at 1 inch with correct range and polarity automatically selected Accuracy Better than ±10% of reading ± LSD + zero offset Zero Tolerance ± 5 counts, ± 3 counts typical Response Display updates three times per second HIGHLIGHTS MONROE 281 Portable, affordable, battery-operated static locator for avoiding static build-up that causes costly product damage.
2 advancedenergy.com MONROE ELECTROSTATIC FIELDMETER 281 TECHNICAL DATA Performance Specifications Readout 3½-digit LCD automatically displays measured voltages and polarity plus HOLD and LOW BATTERY indicators Normal Range ±20kV at 1 inch with correct range and polarity automatically selected Extended Range Voltages of 20kV and higher may be measured by increasing the distance to the target: kV Distance Multiply Reading By 0 to 20 4.0 in 2 0 to 40 8.5 in 4 Accuracy Better than ±10% of reading ± LSD + zero offset Zero Tolerance ±5 counts, ±3 counts typical Response Display updates three times per second Mechanical Specifications Weight 142 g (5 oz) Electrical Specifications Battery SavR TM Timeout 90 seconds, typical Battery 9 V, Eveready #216 or equivalent NEDA #1604 Battery Life 200 hours of normal use Grounding Path Through conductive case The Monroe 281 instrument's accuracy is dependent on 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 measure ment distance. It should be at least 5 x 5 in for true accuracy. INSTRUMENT ACCURACY
advancedenergy.com 3 MONROE ELECTROSTATIC FIELDMETER 281 1. Press the POWER ON/HOLD button and release. 2. Discharge your body by touching a grounded conductive object, e.g. water pipe, metal electrical conduit, grounded machinery or workbench. Alternatively, the operator may wear a grounded wrist strap or place a wrist strap around the in strument. The case of the instrument is conduc tive and is the reference for the measurement. 3. Face the static locator away from charged objects and 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 de pressing the ZERO button twice. Display should read 0.00kV ± 5 counts maximum. 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 instrument. 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 PWR ON/HOLD button. A source with a negative polarity will show a minus (-) sign in the display. A positive source will display no sign. 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. 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 in the display above the “HOLD” indicator for more than an instant or at least 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 theinstrument for an extended period of time. OPERATION 1 NOTE — If, as you approach the target, the indicated field strength begins to exceed 20kV at a distance greater than 1”, STOP! This implies that the target voltage may be high enough to create an arc. Proceed with caution.
For international contact information, visit advancedenergy .com. sales.support@aei.com +1.970.221.0108 ABOUT ADVANCED ENERGY Advanced Energy (AE) has devoted more than three decades to perfecting power for its global customers. AE designs and manufactures highly engineered, precision power conversion, measurement and control solutions for mission-critical applications and processes. Our products enable customer innovation in complex applications for a wide range of industries including semiconductor equipment, industrial, manufacturing, telecommunications, data center computing, and medical. With deep applications know-how and responsive service and support across the globe, we build collaborative partnerships to meet rapid technological developments, propel growth for our customers, and innovate the future of power. Specifications are subject to change without notice. Not responsible for errors or omissions. ©2020 Advanced Energy Industries, Inc. All rights reserved. Advanced Energy®, Monroe Electronics®, and AE® are U.S. trademarks of Advanced Energy Industries, Inc. ENG-ESD-Monroe-281-235-01 03.20