High Quality digital DC Ammeters capable of measuring 5mA through 200Amps solve pipeline cathodic production problems.

Two models of Swain are manufactured: the MER and AutoMER corrosion meters. Both offer fast, precision accuracy to read magnitude and direction of current.

Explore our different products below.

AutoMer

Clamp on DC Meters

One-of-a-kind Clamp-on DC Ammeters
The Swain Meter™ Company manufactures portable clamp on DC ammeters that precisely measure the magnitude and direction of DC current flow on any conductor. Used both onshore and offshore, Swain DC clamp on amp meters accurately read current from 5mA to 200 Amps with a resolution of 1mA in the 0-2Amp range.

Swain AutoMER™ meters cancel out AC interference up to 10Amps to establish a +/- 1% reliability specification. MER is “Magnetic Error Reduction”, a patented technology (US patent 6,323,635 1) is constructed to cancel out the earth’s magnetic field and establish an error-free baseline from which precise readings are obtained. The AutoMER technology allows the meter to quickly measure the magnitude and direction of DC current on any conductor.

Data logging jacks are a standard feature on the MER Meter. Recorder connector with 0±2 V full scale output, plus overrange.

Features:

  • Optional external battery operation.
  • Measures direct current without interrupting the circuit.
  • Magnetic Error Reduction (MER) type Clamp DC Ammeters™ are generally more accurate for measuring direct current with a non-contact sensor. They are constructed to substantially reduce zero offset error due to non-uniform magnetic fields common on steel pipe, near rebar, or near the battery in cars and trucks. The benefit is usually two or three to one over comparable standard Swain Meters.
  • Offshore platform anode current or transmission line current can be measured at 700 ft. depth or more. MER™ DC Clips (to 6″ dia.) and Clamps (to 82″ dia.) work undersea for a long time when waterproof connectors are provided.
  • Accuracy is ±1% reading, ±3 digits, ±He*. User friendly 31/2-digit LCD meter with polarity and 1/2″-high numerals.
  • Protected from 300 A overload.
  • AC input current is rejected to less than 5 mA change with 10 A input.
  • Portable, with auto off, or full on for recorder, 50 hr. typical alkaline internal battery life. Test Battery range provided.
  • * He is zero offset sensitivity of the sensor to the earth’s magnetic field. The earth field is uniform unless steel is close and distorts it. A strong magnet nearby can also cause zero offset.
  • 3/4″ Clips to 82″ dia. Clamps, which work in a desert, or 500 ft. under water with optional waterproof connectors and extensions.

Automer™ Meter

The Swain Automer™ DC Current Clamp Meter is a test meter for corrosion detection that features auto ranging and auto zeroing. MER stands for Magnetic Error Reduction.

Our Pelican® brand case design is water resistant and uses dust proof, military style, Cannon Connectors. Data logging output jacks are a standard item on all AutoMER™ and MER® Meters.

Features:

  • Optional external power source available.
  • Measurement range is selected automatically — typically 2, 20, or 200 A., within seconds of a change of input current. Zero is also automatically and precisely set.
  • AutoMER™ model DC Amp Current Clips are generally more accurate. They are constructed to substantially reduce zero offset error due to residual magnetism in transmission line pipe, or magnets in vehicles. The benefit is usually two or three to one over comparable standard Swain Meters.
  • Polarity (direction of flow) of measured current is shown both on the LCD meter and also at the output terminals.
  • AutoMER™ is fully portable, with 50 hr. battery and “Low Batt” icon.
  • In “Auto”, Range selection, Zero adjustment, and also battery OFF are automatic.
  • In “Manual”, Range is selected and Zero is set by hand. Battery power stays on.
  • External Battery is optional.
  • Resolution: 0-2Amp range is 1mA, Zero to 20Amp range is 20mA, Zero to 200Amp range is 100mA MAX resolution.
  • Clamps with 24″ to 60″ inside diameter have 10 mA max. resolution.
  • Accuracy is ±1% reading, ±3 digits, ± zero offset due to magnetism. The LCD meter has 3½ digits with ½” high numerals.
  • Output for a recorder is ±2 V at full scale input on any range. Overrange is available. AC input current is rejected to less than 5 mA change with 10 A rms – 60 Hz input.

Corrosion Sensors

Swain clips and clamps (MER2™ Corrosion Sensors) are constructed to reduce zero offset error and manufactured with aperture diameters from ¾” to 82″ to date.

  • Swain Clips & Clamps are hand crafted of quality materials with attention to detail.
  • Clips and Clamps form a 360° closed loop around a conductor.
  • Swain Clips and Clamps are also referred to in literature as “Sensors”.
  • Swain Sensors are rugged and well suited for work in most environments including bridges, rigs, utilities, underwater and for offshore corrosion protection. .

Our technicians build each meter and corrosion sensor by hand and calibrate them to exact specifications. MER2™ DC Amp Clips and Clamps are “Swain Sensors” which precisely detect the magnitude and direction of direct current flowing on magnetized conductors during normal operation without interrupting the circuit. Swain portable DC amp clips for cathodic protection above ground and sub sea are manufactured from 2″ to 8″ in diameter. Swain clamps are two piece sensors manufactured from 6″ to 82″ in diameter. Larger clamps may be built upon request.

  • MER2™ (Magnetic Error Reduction doubled) type DC Amp Clips are generally more accurate for measuring direct current with a non-contact sensor. They are constructed to reduce errors due to non-uniform magnetic fields common on steel pipe, near rebar, or near the battery in cars and trucks. Zero offset error is generally less than one quarter that of comparable standard Swain Meters.
  • Typical accuracy is ± 1% reading, ± 3 digits, ± He. User friendly 31/2 digit LCD meter with polarity & 1/2″ high numerals.(He is zero offset sensitivity of the sensor to the earth’s magnetic field. The earth field is uniform unless steel is close and distorts it. A strong magnet nearby can also cause zero offset.)
  • Protected from 300 A overload.

This is intended to ensure the Swain Meter™ is functioning properly. The 70 mA current flows in the wire to the 10 turn loop from the red end towards the black end when the button is pushed, provided the LED appears bright.

To use, either the single turn or the 10 turn wire loop is placed in the aperture of the clip or clamp sensor, toward the center, or with a large clamp, along one side, away from the lips. When the wire is close to one side of a clamp, it is likely to read 1% or so higher than the 70 mA in the wire.

The “Zero” adjustment on the indicator may be set so that the meter reads zero before the 70 mA is turned on, but this is not necessary. We often read the meter with the 70 mA off, and then again with it on. The difference between the 2 meter readings should be 70 mA ± 2 mA for a single turn loop or 700 mA ± 10 mA for the 10 turn loop, when using a directly calibrated sensor. If not, check the calibration chart shipped with the sensor. Observe the polarity. It should agree with the calibrator.

If the LED is dim, or in any event after 4 hours of continuous use, or 4 months, whichever comes first, the two alkaline AA cells should be changed. The battery voltage must exceed 2.5 Volts when the LED is lit. If you have a question, please call us at 989-773-3700.