ELECTRICAL RESISTANCE (E/RTMSYSTEMS
Description
The Electrical resistance technique measures metal loss continuously from a permanently installed probe. The metal loss is measured as the increase of electrical resistance of the probe sensing element as it
cross-section is reduced by corrosive action. E/R instrumentation
coverts the resistance increase into metal loss and corrosion
rate readings.
Applications
Since the Electrical resistance technique is not limited by the conductivity of the corrosive environment, it is applicable in almost any process. It is especially useful in soils, gases, vapors, hydrocarbons, thin moisture films and low conductivity waters. As such, it finds wide application in the following situations:
- Oil/gas production and transmission systems
- Refinery/petrochemical process streams
- External surfaces of buried pipelines
- Feed water systems
- Flue gas stacks
- Architectural structures
PROBES
Electrical resistance probes are available in a wide variety of body styles and element geometries, thicknesses and alloy compositions. This allows the user to closely match his needs with respect to probe life, element sensitivity and practical system access. The basic categories of probe design are:
ER0250
For burial in soils, concrete and for atmospheric use.
ER1000
Threaded bushing and flange mount probes for installation pressures up to 4000 psi.
ER3000
Ambient temperature/pressures probes for laboratory use.
ER4000
High-pressure probes with packing gland entry. Retractable under pressures up to 1500 psi.
INSTRUMENTATION
MS0500
A time proven, portable unit that measures metal loss. Designed for intrinsically safe operation, this unit combines rugged construction with ease of operation.
MS1500E
This "state-of-the-art", hand-held, data logger can measure and store up to 3100 readings from any combination of up to 100 probes. The need for manual record keeping is eliminated, since all stored information can be recalled to the screen for review. The unit incorporates an RS-232 series port to download data to any IBM PC for more sophisticated data handling, analysis, and reporting.
MS2500E
This unit is a 4-20 mA Transmitter for permanent installation at a single probe location. It provides a continuous measure of metal loss that is transmitted by a current loop to the client's process control unit. The signal may also be transmitted to a single channel receiver unit, or a multi-channel data logger, for signal process and display.
MS3500E
This unit is a dedicated battery-powered data logger, for permanent installation at a single probe location. It will measure the probe at a customer selected time interval and accumulate stored data up to a maximum of 3100 readings. Data can be downloaded via an intrinsically safe "OPTI-LINKTM" to a notebook computer, or to Cortest's portable unit. A modified version of this unit also includes a 4-20 mA current loop.
CONTACT:
Cortest Instruments, Ltd.
10 Riverside Business Park
Stoney Common, Stansted
Essex CM24 8BP
United Kingdom
PHONE: 44-1-279-816630 FAX: 44-1-279-816730
e-mail: cortestinst@mcmail.com
web site: www.cortest.com