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I. General Description
A. Introduction
The development of the MS2500E Transmitter provides the corrosion engineer with a simple,
lowcost, computer-compatible corrosion monitoring instrument. Designed to be incorporated into
a 20 mAcurrent loop, the MS2500E Transmitter uses the principle of electrical resistance to deter-
mine the corrosion rate of a metal specimen immersed in a process stream. The electrical resis-
tance of a metal specimen is a physical property dependent on the specimen’s physical dimensions
(length and cross section) and on the metal’s inherent resistivity. If all other factors remain con-
stant, any decrease in the cross section of a metal specimen will increase its resistance.
The MS2500E Transmitter is used in process systems for which appropriately designed electrical
resistance probes are available. Such systems include, but are not limited to nonaqueous, noncon-
ductive process streams, process streams where erosion-corrosion occurs and process streams
having either a predominant liquid or vapor phase. Examples of industries where such process
streams are found include chemical plants, refineries, gas plants, oil and gas production systems,
paper mills, power plants and tank farms.
B. General Description
The MS2500E Transmitter provides a two-wire interface between a single electrical resistance
probe and a customer-supplied process computer, recorder, or control system, or between a probe
and the MS2510 Receiver (ordered separately). The MS2510 Receiver and the MS2500E Trans-
mitter function together as a stand-alone, single-station monitoring system.
The current loop connecting the Transmitter and the data receiving station may be up to 11 miles in
length for circuits that do not include safety barriers and up to 1 mile for intrinsically safe circuits
(circuits that do include safety barriers or their equivalent). A customer-supplied DC power source
energizes the monitoring system. Probe signals representing metal loss are processed by the Trans-
mitter and are relayed to the data receiving station as a 4-20mA signal.
Unlike similar devices available from other manufacturers, the MS2500E Transmitter does not
require factory modification to accommodate different probe types.Asimple field calibration pro-
cedure permits the MS2500E to be used with any electrical resistance probe. The MS2500E will
accommodateall MetalSamples electricalresistance probesand mostof theelectricalresistance probes
ofothermanufacturers.
The MS2500E Transmitter is available in one enclosure style. This style is mounted on any flat
surface up to 5 feet from the probe and is connected to the probe via a special cable, model
Cb-8140 (included).
