Electromagnetic field detectors

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How electromagnetic surveys  are conducted

Request for an electromagnetic survey service

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Essentia EM2 Meter 1Hz to over 18GHz from 0.05 microWatt per centimeter square to 100 milliWatt per centimeter square power density.

TriField 100XE 60Hz electric (but electric field sensitivity at 5V/m), magnetic fields + magnetic ELF (1-1,000Hz) + radio & microwave power   (50 Hz also available) 

The analog TriField is used for the measurement of:

The magnetic and electric field settings are frequency-weighted from 30 to 500Hz and are calibrated at 60Hz. For example, a 60Hz magnetic field with a strength of 2 milliGauss (mG) will read, "2" on the meter, but 120Hz at 2 mG will read "4" on the meter. This is to gauge the currents induced inside the body, which are proportional to field strength multiplied by frequency. From 500Hz to 2000Hz, the response is flat +/- 20 %. Above 2000Hz, the magnetic and electric sensitivities of the meter slowly decrease with increasing frequency, falling to zero near 100KHz, but with some residual sensitivity up to 100MHz. In theory, the body's sensitivity to fields should begin to decrease at frequencies above about 500Hz. Accuracy is +/- 20 % of scale reading for Magnetic, and +/-30 % of scale reading for Electric (RMS @ 60Hz). The Radio/Microwave probe is sensitive from 50MHz to 3GHz and is calibrated at home microwave over frequency (2GHz). The accuracy is -50% to +100% because of the unpredictable effect of reflections within the room and off the user. 

The TriField 100XE registers electrical fields as low a 5 Volts/Meter. Biological and psychological effects and risks have been reported starting at 10 V/m fields, a common powerfrequency electric level in most bed pillow sites throughout North America. In countries where the voltage is higher (220V), higher ambient electric fields are noted while in the 110V system, the power- frequency magnetic fields tend to be more prevalent in areas used by the general public.  

TriField Natural2 (experimental) measures static (non-varying) electric, static magnetic as well as natural static microwave phenomena, with an audio function. Includes AC adapter & jack, and external coil jack

The TriField Natural2 meter is very helpful in identifying unusual natural environmental phenomena and interactions between natural and artificial electromagnetic fields. Monitors magnetic and electric field transients of living or magnetized objects. The sum setting is excellent for motion-detection and bioenergetic research. Omnidirectional. Tone signal. Analog.

TriField Broadband 100XE measures electric fields up to 2,5GHz, magnetic fields up to 100kHz.  

This meter locates surveillance "bugs", "hot" conductors and radiofrequency interference (RFI). It upgrades the quality of detail of professional surveys in enabling proper tracing of wiring and appliance-related problems, by determining which wires or circuits carry current, and the detection of improper grounding.

The TriField meters operate with a 9V battery, and should last for about 30 hours (with alkaline battery). The units are warranted against defects in materials and assembly for one year from the date of purchase.

AC Magnetic Field Meter IDR109 for 60Hz magnetic fields - directional air-coil sensor, 32K data point log (50Hz available).

VLF Gaussmeter AC Magnetic Field Meter IDR200 1- 200 kHz magnetic fields 3-axis air coil sensor, 32K data point log, RD-232 communication port.

ELF Gaussmeter AC Magnetic Field Meter IDR210 20- 4.000 Hz magnetic fields 3-axis air coil sensor, 32K data point log, RD-232 communication port.

AC MilliGauss Meter UHS measures 13Hz 75 kHz AC magnetic fields with 3-axis probe; also VLF only (1 75 kHz) & single axis for 13Hz to 75 kHz, can indicate direction of current flow.

Air Shipment Oersted (MilliGauss) designed for measuring horizontally at a distance (e.g. for air shipment packaging).

High Resistance / Low Conductance 1000 TeraOhm Meter measures 19,999 MegOhm 1999.9 GigOhm resistance and conductance in 19.999 nanoSiemens and 19.999 picoSiemens.

Surface DC Voltmeter measures static charge on a surface or object; measures voltage on conductive surfaces, electric field on insulators (some glass, paper and most plastics); and can also measure ohms/square resistance of anti-static surfaces (resistance on most plastics, including paints).  

Ultrastable Surface DC Voltmeter measures voltage on conductive surfaces, electric field on insulators or atmospheric electricity, unaffected by air ions.  

This device is helpful in not only determining static electric situations but also in identifying which steps in a process introduce or remove charges. A 1" spacer standardizes distance between the meter and object being measured. Surface voltage is measured on a LCD display in kilovolts. Accuracy is 2% of the reading, provided that the surface measured is at least 25cm wide (10"); otherwise, display will read lower than the actual voltage - however, formulae are provided in a manual with unit to estimate actual surface voltage. The range is -19,999 to +19,999 kilovolts, with 1 volt resolution. A reading of more than 10,000 kilovolts means that sparking is likely. Attachments include: space rod, cord to earth ground and a brass sensor disk. The meter uses a standard 9-Volt battery (which is included) and has a low battery indicator on display. Battery life is typically 3 hours of measurement time. Warranty is for 1 year.

RF Field Strength Meter radio/microwave measures the power density of radio waves from 0.5MHz to 3,000 MHz (3 GHz).  

Accuracy in the cell tower range (800 - 1,700 MHz) is 20% of the reading. At the frequency limits of 0.5 MHz and 3,000 MHz, it reads 3dB low (-50%). There are 3 ranges that span from 0.001 to 2,000 microwatts/cm. The bandwidth switch allows a high-pass function (with a 6dB per octave roll off below 100MHz) so that the high frequencies such as cell towers are allowed through. This switch can also be set to "Wide" bandwidth, allowing all frequencies down to 0.5MHz, including AM radio. Normally, this is set on "Fast" however, to permit monitoring of changes rapidly. Controls on the side of the unit allow neutralization of the offset (which is temperature dependent and is usually only a few nanoWatts (0.001 microWatts) per cm2. The meter uses a standard 9-Volt battery (which is included) and has a low battery indicator on display. Battery life is typically 3 hours of measurement time. Warranty is for 1 year. 

MicroAlert  radio/microwave alarm beeper directionally detects signals as weak as 0.001mWcm from 100MHz to 5GHz.  

This pager-sized beeper is helpful for locating cellular phone towers up to 1 km away, analog and digital phones, microwave oven use and surveillance "bug" and like devices. Battery lasts 3 years.

Electromagnetic Monitor (50 Hz - 3 GHz - with a decreased response up to 10 GHz) detects directionally full spectrum electric emissions from power-frequency appliances and wiring to wireless equipment, with a sensitivity as low as 0.01 micro Watt/square centimetre to a maximum of 10 milliWatt/square centimetre on a scale of 6 LEDs coloured from blue to red. Accuracy is 30% in the 50Hz to 3GHz range, includes a 9V battery, sufficient for 50 hours of continuous use.  

AC Electric Field Meter (40 Hz 100 kHz) measures accurately and faster the broadband electric field than existing meters. Large LCD display.   

This device has an absolute accuracy at 40Hz to 20kHz of 2% of the reading, with 1 count (1 count being 1 volt/meter). For frequencies of up to 50kHz, accuracy is still 2% of the reading, but the last digit will read lower by 2 counts at 25kHz and by 4 counts at 50kHz. At 100kHz, the meter will read low by 5% and low by 9 counts. The meter uses a standard 9-Volt battery (which is included) and has a low battery indicator on display. Battery life is typically 20 hours of measurement time. Warranty is for 1 year.

Air Ion Counter (2 Million or Special 20 Million ions/cubic centimeter models - please specify which range model) for atmospheric electricity.  

This counter provides precision positive or negative ions measurement, with sensitivity comparable to instruments 10 times more expensive (dynamic range is between 10 and 2,000,000 ions/cubic centimeter or between 100 and 20,000,000 ions/cubic centimeter - please specify when ordering which range is suitable for your requirements). Ion collection efficiency is 65%. Large digital display. Can reset to zero in windy conditions. 2 9V batteries, with lifetime from heavy duty of 10 to 30 hours. (See web page on negative and positive ions)

Radalert 100 Geiger detector (gives counts per minute, as total count or in mR/hr) for Alpha, Beta, Gamma and X-radiation with a digital display. New updated design features: 3-second LCD response time, detectability range to 110 mR/hr, 1,100  Sv/hr  and 350,000 CPM, 3,500 CPS and the ability to take a timed total count from 1 minute to 40 hours. Utility menu options allow turn "on"/"off" auto averaging, changes between units of measurement and adjust calibration factor.  

Use the Radalert to: monitor personal radiation exposure, monitor an area or perimeter, detect radiation leaks, check for contamination, find radioactive items in the workplace or home, check for radioactive deposits in the ground, check for X-ray scatter and to locate spills and lost materials. The Radalert features: digital LCD display, adjustable alert level, dose rate or accumulated dose. It is a Geiger Mueller detector that can interface to a computer or data logger or to an external warning device.

Radalert Specifications: Sensor: Geiger tube with mica end window (LND 712) Detects Alpha, Beta, Gamma, and X-radiation. Display: 6 mm (0.4-inch) liquid crystal display. Operating Range: 0-19999 accumulated counts or 0-19999 counts per minute (approx. 0-20 mR/hr). Calibration: with Cesium 137: 982 cpm per mR/hr; or, with Cobalt 60: 958 cpm per mR/hr. Alert: pulsating beeper sounds the alert. Alert level is adjustable in 10-count increments, from 10-9,990.

Count Light: red LED flashes with each count. Beeper: Chirps for each count (can be muted). Outputs: Dual miniature jack drives CMOS-compatible devices: 1) counts to computer or data logger, 2) alert to external warning device. Power: 9V battery gives 3-6 months continuous use at normal background level; jack provided for optional AC adapter. Size: 150 x 80 x 30 mm (5.9 x 3.2 x 1.2 inches). Weight: 270 grams (9.5 oz.) including battery.

Inspector Alert meter for laboratory and field surface contamination (counts per minute, mR/hr. Sv/hr, CPS and total) up to 24 hours, with a digital display. Features a user-alert feature that can be set to alarm above the normal background radiation level. The Inspector Alert uses a 2-inch pancake Geiger-Muller sensor and is highly sensitive to even low levels of nuclear radiation. 2000-hour battery-life at normal background levels of radiation, with a 9-volt battery.    

Inspector EXP external probe surface contamination monitor for emergency response personnel (similar in features, size and quality as the Inspector Alert, but with the versatility of an external probe. Carrying case has clear window panel for full view of readout and count light, with access to switches. Includes hand straps, belt loop and a small pocket for a check source. Probe may be attached to carrying case if desired. Protective probe cover folds easily out of the way during one-hand operation. Gives (counts per minute, mR/hr. Sv/hr, CPS and total) up to 24 hours, with a digital display. Features a user-alert feature that can be set to alarm above the normal background radiation level. The Inspector EXP uses a halogen-quenched 2-inch pancake Geiger-Muller sensor and is highly sensitive to even low levels of nuclear radiation. The RAP-RSI probe is enclosed in anodized aluminium housing with coated, black foam grip, a 500 Volt power supply in probe head, and Amphenol tuchel connectors. 2000-hour battery-life at normal background levels of radiation, with a 9-volt battery.      I

Inspector specifications: Detector: Halogen-quenched Geiger-Mueller tube with effective diameter of 1.75" (45mm) mica end window density 1.5 - 2.0 mg/cm. The display has 4-digit crystal display, with mode indicators. Operating Range: mR/hr: 0.001 to 100.0,  0 - 300,000 counts per minute, 0.01 to 1,000 mSv/hr, 0 to 5,000 CPS, and a total of 1 to 9,999.000 counts. Calibration: Gamma sensitivity is referenced to 3,500 CPM/mR/hr with Cesium 137, with smallest detectable level for I-125 being 0.02 mCi at contact. Efficiency for 4 pi geometry at contact: Beta: C-14 (49 keV average, 156 keV maximum) 5.3%, Bi-210 (390 keV average, 1.2 MeV maximum): 32%, Sr-90 (546 keV and 2.3 MeV): 38%, P-32 (693 keV average, 1.7 MeV maximum): 33%; Alpha: Am-241 (5.5 MeV): 18%.

The display updates every 3 seconds, showing the average for the past 30 second time period at normal levels. Averaging period decreases as radiation level increases. User can select fast, 3-second averaging periods. The timer can set 1 to 10 minute sampling periods in 10-minute increments, and a 1 to 24 hour sampling periods in 1 hour increments. The alert beeper sound the alert, with a user-adjustable alert level being set using 3 buttons. Accuracy is 15% up to 50 mR/hr; 20% up to 100 mR/hr. For anti-saturation, the readout holds at full scale in fields up to 100 times the maximum reading. The temperature range is -20 to +50 C, -4 to 122 F. Power: 9V battery gives an average of 2,160 hours at normal background, and an average of 625 hours at 1 mR/hr, with beeper "off".  Size: 150 x 80 x 30 mm (5.9 x 3.2 x 1.2 inches). Weight: 350 grams (11.4 oz.) including battery. I/O Ports: Stereo 3.5 mm jack for CMOS or TTL devices sends counts to computer or data logger. Mono 2.5 mm jack provides electronic calibration input. The Count Light consists of Red LED flashes with each radiation event The Beeper beeps with each radiation event and can be muted. There is an optional wipe test plate.

GM1 Radiation Counter pancake style for Alpha, Beta, Gamma, cosmic rays, and X-radiation

AC Magnetic Field Meter (professional) for 60Hz magnetic fields with directional air-coil sensor. Data logging functions (50Hz also available .    

This meter, intended for both commercial and residential use power line monitoring, is sturdy, portable and battery-powered. It features auditory and visual alarms, and a remarkable linearity. The large-size liquid crystal display indicates multiple range settings: 2, 20, and 200 milliGauss. The sensitivity ranges are set from 1 microGauss to 2000 milliGauss with an accuracy of 2% in any range. The device is 7.5 x 10 x 17.5 cm in size and weighs (with the coil probe and battery) 650 grams. The shielded and grounded air coil sensor probe comes with a 20 cm handle and a 90 cm cable. Power consumption is 200 mW and the battery life is 48 hours with 9V alkaline units. The meter comes with complete instructions and a description of a typical environmental 60 Hz magnetic field study. An optional calibration kit is available. One-year parts and labour warranty.

DC Gaussmeter IDR329T (kilogaussmeter) with a Hall Effect sensor, with range settings of 20, 200, 2,000 and 20,000 Gauss. Bandwidth: 68Hz at 3dB.    

DC Gaussmeter Model 1-ST (1- 19,999 Gauss) measures with resolution starting at 0.10G resolution, accurately and with an LCD display updated 4 times/second for the measurement of magnets of any strength or type, including their fractional variations. Single axis probe is at the end of a 1m (40") flexible cable only 1.5mm (0.06") thick.  15cm (6") unit with 9V battery (last 40hrs), flip-down stand for bench top reading, 1 year warranty. measured is from 40Hz to 100kHz. Large LCD display.   

DC Magnetometer IDR307 T (Gauss) with Hall Effect axial/transverse probe, with range settings of 200 -20,000 Gauss range, 0.01 Gauss resolution. IDR307 T (transverse/axial probe)

These meters measure the static (non-varying) magnetic field from magnets and magnetized objects. Large-size liquid crystal display. Come with a 9V DC adapter.

Earth Magnetometer with 0.01 mG/1nT resolution, probe rod..

Geomagnetometer IDR321 with directional pencil Hall probe.

Zero Gauss Chamber IDR800 to adjust and calibrate geomagnetometers.

DC Gauss meter (laboratory model) with directional probe, 0.01 to 20,000 Gauss. DC Gauss meter 1-ST with directional probe for solenoids, magnets, 0.01 to 20,000 Gauss (see box above).

These meters measure remote static (non-varying) magnetic field from underground, high density sources, ore bodies, etc.. (See geomagnetic disturbances).  Large liquid crystal displays.

MSI 20/25 (digital extremely low frequency magnetic field meter) directional, single axis probe with toggle switch: 60Hz only or 60Hz + harmonics content up to 4,000Hz. 1mG to 700 Gauss range.

The MSI 20/25 meter can be combined with Fluke 83 or 85 or Goldstar 232 multimeters to determine predominant frequency present, or with oscilloscope to view wave form and for data logging (1mV/mG). The sensor is separate with a 2-foot extension lead. The meter becomes an Electric field meter with the E-100 sensor attachment with a range of 0.7 to 700,000 V/m. Large liquid crystal display. With field guide and carrying case.

MSI AJK-95 ELF (digital broadband extremely low frequency magnetic field meter) directional single axis probe: 25Hz to 3,000Hz. 1mG to 700 Gauss range.

The MSI AJK-95 ELF meter can be used for data logging (1mV/mG). The sensor is separate with a 2-foot extension lead. The meter becomes an Electric field meter with the E-100 sensor attachment with a range of 0.7 to 700,000 V/m. Large liquid crystal display. With field guide and carrying case.

MSI meter Accessories                                                                                                                         

E-100 Electric field sensor 0.7 to 700,000 V/m                                                                            

BV-1 Body voltage adapter adapter reads in mV and V, AC.                                  

RS-232C Computer serial port interface - call us

Electrosensor (pocket-size Gaussmeter).

This easy-to-use directional meter comes with 10 LED light bar settings ranging from 1.5 to 30mG. Operates on one AAA battery that is included.

 

_______________________________________________________________________

How electromagnetic surveys  are conducted

Request for an electromagnetic survey service

________________________________________________________

All prices are listed in Canadian funds. For US and International orders, please contact us

 by e-mail: essentia@essentia.ca

or by phone: (888) 639-7730 or (613) 238-4437