Stelth® Reference Electrodes

Product Categories > Reference Electrode > Stelth® Reference Electrodes

STELTH® reference electrodes are built to be:

Simple to install – Just soak them in water, inert them in a 2′ hole, and cover with soil.
Calibrated – Never needs re‑calibrating, though we’ll retest them for you annually – for free – if you need it
Traceable – We can track every single electrode for its lifetime with its unique serial number
Easy to use – Once it’s installed, simply connect a voltmeter and take your readings!
Sensitive – Expanded ceramic sensing area is 36 times larger than competition, ideal in high‑resistance and dry soils
Stable – Solid‑state electrolyte and proprietary Moisture Retention Membrane – MRM™ – keeps chemistry from leaching like our competitor’s gel- and liquid‑based reference electrodes
Durable – Same ceramic material used to grind steel tools
Long-lasting – Bury our STELTH® permanent reference electrodes and don’t worry about them for 30 years!*

*For all STELTH® models except for the STELTH® 3 & 4 (Portables = 20 years).

Exclusive Stelth® Features

Moisture Retention Membrane MRM^TM – The Moisture Retention Membrane traps moisture and the internal chemistry inside the cell. This is critical in dry soil conditions. Also. the MRM^TM prevents contaminated ground water from entering the reference
Chloride Ion Trap (Membrane impregnated) – First, we impregnated a trapping material into the ceramic sensing tube that traps chloride ions before they reach the chemistry of the Stealth®
Chloride Ion Trap (Integral to electrolyte)- We employ a chloride ion trapping system that removes chloride ions that penetrate the CuS04 chemistry of the Stealth® before these ions can cause damage. Chloride levels of only 200 parts per million will alter the chemistry of a Cu-CuS04 reference cell, causing a complete breakdown, resulting in a loss of stability and finally a total shut down
100% Testing of each Stelth® Reference Electrode – Each cell is individually calibrated against a calomel reference under field conditions. They are then tested for internal resistance, continuity, IR Drop, sensitivity, stability and finally serialized. “Certification Certificates” are provided for each cell to the End User. This calibration method is impossible to do with the old-fashioned plaster backfilled reference electrodes.
The Stealth® Reference Electrodes can now be FROZEN – With the development of the Moisture Retention Membrane MRM^TM the Stealth® reference electrodes can now be used in frozen environments without concern of damaging the cell. Through extensive testing with hundreds of cells in Russia, the MRM^TM, has proven to eliminate failures from freezing
Sensing Area Increased to 33 sq. inches (182 sq. cm²) – The larger the sensing area surface that comes into contact with the internal electrolyte, the greater the sensitivity of the cell and the lower the IR Drop is between the reference electrode and the soil environment it makes contact with.
Hydrogen Sulfide Sensor (Integral to cell) – Provides the ability to examine a reference cell and its surrounding environment should it come under attack from hydrogen sulfide. This can be accomplished on site, without having to send the electrode to a laboratory for analysis.
Sulfide Ion Trap – Hydrogen sulfide contributes to an ever-increasing rate of mortality to reference cells, as industry and garbage landfill continue to invade previously untouched areas. Impregnated in the Stealth® ceramic, is a barrier of sulfide “Ion Trapping” chemistry that absorbs the hydrogen sulfide (H₂S) ions, acting like a chemical sponge.

Stelth®: Reference Electrode for Fresh Water, Salt Water & Saturated Soil Service
Size: 1 ” (25 mm) Diameter x 8″ (203 mm ) long
Lead Wire : 50′ ( 15 m) of # 14 ( 2.5 mm) RHH-RHW wire.
Material: High Impact ABS. Ceramic with Moisture Retention Membrane.
Stability: 5 Millivolts with 3.0 microamps load

Stelth® 2: Reference Electrode for Underground & Concrete Service
Size: 1.5 ” (4 cm) Diameter x 7″ (18 cm ) long
Lead Wire : 50′ ( 15 m) of # 14 ( 2.5 mm) RHH-RHW wire.
Material: Ceramic with Moisture Retention Membrane
Stability: 5 Millivolts with 3.0 microamps load
Temperature Range: – 10° to 176° F (-23° to 80 C°)

Stelth® 3: Permanent Portable Reference Electrode
Size: 2.25 ” (57 mm) Diameter x 8″ (102 mm ) long
Material: High Impact ABS. Ceramic with Moisture Retention Membrane.
Stability: 5 Millivolts with 3.0 microamps load
Temperature Range: – 10° to 176° F (-23° to 80° C)

Stelth® 4: Permanent Portable Reference Electrode
Size: 2.25 ” (57 mm) Diameter x 4″ (102 mm ) long
Material: High Impact ABS. Ceramic with Moisture Retention Membrane.
Stability: 5 Millivolts with 3.0 microamps load
Temperature Range: – 10° to 176° F (-23° to 80° C)

Stelth® 7: IR Free Reference Electrode for Buried & Water Service
Size: 2.25 ” (6 mm) Diameter x 8.5″ (22 mm ) long
Material: High Impact ABS. Ceramic with Moisture Retention Membrane.
Stability: 5 Millivolts with 3.0 microamps load
Temperature Range: – 10° to 176° F (-23° to 80° C)
Includes Bullet Box IR Free Interrupter and Bullet Box CP Test Station

Stelth® 7 Rocket: IR Free Reference Electrode for Tank Bottom Service
Size: 2.25 ” (5 mm) Diameter x 13″ (33 mm ) long
Material: High Impact ABS. Ceramic with Moisture Retention Membrane.
Stability: 5 Millivolts with 3.0 microamps load
Temperature Range: – 10° to 176° F (-23° to 80° C)
Includes Bullet Box IR Free Interrupter and Bullet Box CP Test Station

Stelth® 7: Reference Electrode of the Future

Stelth 7® IR Free & Stelth 7® IR Free Rocket reference electrodes were developed to take IR Free on-potential and off-potential readings of a structure without having to shut down or turn off any interference systems such as your own system rectifier other rectifiers in the area, electric trains and subways, electrical transmission lines, etc., while reading only the single worst potential that exists on that structure
The Stelth 7® IR Free & Stelth 7® IR Free Rocket have a minimum design life of 30 years and an indefinite shelf life. Shipping weight is only three pounds.
The Stelth 7® IR Free & Stelth 7® IR Free Rocket will maintain a stability of 5 millivolts with no more than a 3 micro-ampere load over 30 years – Temperature range from -10° to 176°F (-23° to 80° C).
The Stelth 7® IR Free & Stelth 7® IR Free Rocket will operate in all ranges of soil and water conditions, from desert dry soils to flood zones, swamps, sea and fresh water environments. Can be reused and taken in and out of service, as many times as desired.
Eliminates expensive interrupters. *Eliminates the tedious procedure of synchronizing a series of interrupters.
Allows you to take off-potential readings on rectifiers that have high amperage outputs which are beyond the capacity of the interrupters on the market today to handle.
This technology easily allows any remote monitoring and control system (process control system) to automate the IR Free on-potential and off-potential readings of a structure.
On-potential and off-potential measurements can now be taken with total disregard for any and all outside influences – Your own rectifier – neighboring rectifiers – anode beds – electric transmission lines – trains & subways – steel in concrete – etc.
Now, with the Stelth 7® and the Bullet® Box IR Free interrupter you can read the current required to protect the holiday with the worst potential on your structure in the area being monitored