June Featured Product of the Month Model SM Magnetic Switch

EDI Model SM Magnetic Switch System consists of a sealed reed switch for use in above and below ground test stations. The switch is activated by holding a magnet next to the colored band. Green bands denote normally closed switches which are momentarily opened with the magnet. These are most often used for instant-disconnect cathodic protection coupon measurements. Red bands denote normally open switches which are momentarily closed with the magnet. These can be used to electrically isolate a reference electrode in test stations which may become submerged.Magnetic switches are available in Board Mount, Model SM-BRD, or Adjustable Mount, Model SM-ADJ, configurations. are on a small circuit board with two 9/32 in. (7 mm) dia. holes on 1 in. (25.4 mm) spacing. These switches will fit over adjacent terminals of most test stations.  are centered on a length of wire terminating in 9/32 in. (7 mm) ID ring lugs. Ring lugs are spaced at 6-1/4 in. (160 mm). This design is used when the switch must span non-adjacent terminals in a test station. 
An activating magnet with a lanyard, Model SM-MAG, is recommended for use with the switches.
Electrical Specifications
Switching Current: 0.5 amps
Carry current: 1.0 amp
Switching Voltage: 175 volts
Breakdown voltage: min. 200 VDC
Contact resistance: 150 µohm
Operating temp.: -40F – 260F (-40C – 130C)

April Featured Product of the Month Model IT

EDI’s permanent portable reference electrode, Model IT, is used to make potential readings in any application where a standard, liquid-junction portable reference electrode is presently being used. The Model IT contains a gel rather than a liquid so it can be used in all positions. The gel provides long maintenance-free service since it does not require refilling or cleaning. Soil contact is through a hardwood plug which offers several advantages over ceramic membranes: it will not clog as readily, it is resistant to salt blockage, and it can be reworked by light sanding or cutting if it becomes contaminated with oil. The Model IT has a twenty year design life and an indefinite shelf life if the end cap is in place. Gelled copper/copper sulfate (CUG) electrodes have a blue housing while gelled silver/silver chloride (AGG) electrodes have a light grey housing. Both models have a 1/4 – 20 threaded stud termination.

March Featured Product of the Month Model CB

A typical rebar monitoring system consists of a rebar probe, such as Model CP-REB, installed the same distance below the surface as the rebar being monitored.   It is used in conjunction with an Ag/AgCl reference electrode such as the Model CB-AGG for linear polarization resistance measurements of corrosion rate. In this application, the rebar probe is the working electrode while the rebar net is the counter electrode. By periodically monitoring corrosion rate, the efficacy of sealers, membranes and inhibitors can be verified.  Installation of probes is made easier by using a framework such as our Model CR1 rebar frame shown above. The probe and reference electrode are attached to the rebar frame in advance and the entire assembly is tack welded to a structural rebar.   In addition to simplifying installation, the use of the Model CR1 rebar frame ensures that the relative placement of the probe and reference electrode is identical at every installation site.

February Featured Product of the Month Model UC

Our concentric coupon, Model UC, is designed to make potential measurements that are substantially free of IR-drop error without either interrupting current or disconnecting the coupon. It is known as a Concentric CP coupon because the potential measuring ports are located in the center of the coupon, well away from IR drop fields in the environment. This design is preferred for locations where interrupting currents or disconnecting the coupon to make measurements is not practical. It is particularly well suited for use with remote monitoring units. EDI’s concentric CP coupon may be installed at the base of a test station where access through a soil tube is used for making potential measurements. This product may also be ordered with a contained packaged zinc reference electrode which eliminates the need for access through a soil tube. Either version can be ordered with a 1 sq. cm. coupon for measuring AC current density.

 

 

 

 

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December Featured Product Model FE

The Model FE Process Vessel Reference Electrode is designed to operate in environments where ordinary reference electrodes cannot survive. These include elevated temperatures, high pressures and/or contaminated electrolytes. This is a two-piece unit consisting of a bridge which is permanently installed at each location where potential measurements are desired and a separate reference electrode. Because the reference electrode is a separate piece, it is isolated it from the aggressive environment which substantially increases its service life. The reference electrode can also be removed for calibration or service without affecting the integrity of the vessel.

For intermittent readings, the reference electrode is simply pressed into the bridge. In this case, a single reference can be used with several bridges. When continuous readings are required, the reference electrode is threaded into the bridge. Reference elements available with this product are gelled copper/copper sulfate or gelled silver/silver chloride. You will find more data here Model FE

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November Featured Product Model TE

The potential across a tubesheet under cathodic protection can show large variations from one location to another. Areas with excessively electronegative potentials can cause hydrogen damage to titanium or ferritic stainless steel tubes. Other areas may have potentials insufficiently negative to adequately protect the tubesheet. These potential gradients cannot be detected by a reference electrode mounted on the side wall of the waterbox. EDI’s Model TE Tubesheet Mounted Reference Electrode is designed to mount any place on the face of a tubesheet. They are shipped with a double tube plug which is inserted into the end of a condenser tube and tightened. The electrode’s lead wire terminates in a waterproof connector which plugs into a mating connector on the lead wire which has been affixed to the tube sheet face. This attachment system allows the electrode to be easily removed during scheduled outages. You will find more info here Model TE

October Featured Product Model CM

Our Model CM reference electrode can be used in all types of concrete structures. When this electrode is used in seawater applications, where the chloride level of the pore water is expected to remain nearly constant, it functions as a reference electrode providing stable reproducible potential readings. When used in other structures in which the chloride level can vary slowly over time, Model CM provides short term stability suitable for depolarization measurements. Its small size makes it suitable for embedding in the grouted annular space behind piling wraps.
You will find more data here Model CM

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September Featured Product Model UC

Our Model UC concentric coupon is designed to make potential measurements that are substantially free of IR-drop error without either interrupting current or disconnecting the coupon.  The potential measuring port is located in the center of the coupon, well away from IR drop fields in the environment. Concentric coupons are preferred for locations where interrupting currents or disconnecting the coupon to make measurements is not practical. They are particularly well suited for use with remote monitoring units.

EDI’s concentric CP coupon is typically installed at the base of a test station since access through a soil tube is needed for making potential measurements. This product may also be ordered with a contained packaged zinc reference electrode which eliminates the need for access through a soil tube and a 1 sq. cm. coupon for measuring AC current density.

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August Featured Product Model FH

Through-wall reference electrodes are used for measuring corrosion potential on the inside of condenser waterboxes, circulating pipes, tanks and vessels. These electrodes are installed by threading into a tapped hole on the wall; a junction box is typically attached to the other end to protect the wiring connections. Through-wall reference electrodes can be ordered with any commonly used sensing element.

The Heavy Duty Probe (Model FH) has a glass reinforced epoxy (G-10 GRE) extension tube and a 316L stainless steel nipple. It can be used at pressures up to 75 psi (0.5 MPa) and intermittent temperatures up to 210ºF (98ºC). Model FH is available in three size variations:  Model FH10 is threaded into a 1 inch NPT hole, Model FH7 is threaded into a 3/4 inch NPT hole, Model FH5 is threaded into a 1/2 inch NPT hole; all three variations have a 1 inch NPT thread on the termination side.

The temperature limits stated are those for the wetted materials of construction. Through-wall reference electrodes should generally not be continuously used at temperatures exceeding 110ºF (45ºC) because the reference potential will be significantly different from its value at ambient temperature and the electrode service life will be drastically shortened. The product will survive occasional brief temperature excursions up to the limits stated in the preceding paragraph. For applications involving continuous exposure to temperatures over 110ºF (45ºC), our Model FE Process Vessel Reference Electrode is recommended.

July Featured Product Model AT

The Model AT Linear Modular Anode System is an impressed current linear anode system which permits maximum design flexibility. It consists of a copper cored titanium flat wire coated with mixed metal oxide and attached to a #14 AWG HMW/PE insulated bus wire. The wire pair is surrounded by a flexible plastic mesh. Individual anodes are 50 ft. long and are easily connected in the field to form a hermetically sealed joint. This flexibility allows the design engineer to choose a layout which is best suited for the application.

Perhaps the most significant feature of the Model AT is its unique connector system. Each anode is supplied with a pin connector on one end and a socket connector on the opposite end which can be mated either to another anode section to form a string or to a power feed cable. Specially developed “tee” connectors allow intermediate current feeds on long strings. No splicing or welding is required in the field so installation can be completed in substantially less time than any other system. For example, it takes less than 6 man-hr. to install this anode system in a 60 ft diameter tank.

Model AT         Featured Product for July