Metal Samples MS2500E Manuale utente
MS2500E Transmitter
Operator’s Manual
Metal Samples Company
A Division of Alabama Specialty Products, Inc.
152 Metal Samples Rd., Munford, AL 36268 Phone: (256) 358-4202 Fax: (256) 358-4515
E-mail: [email protected] Internet: www.metalsamples.com
.
Table of Contents
I. General Description ........................................................................................................ 1
A. Introduction .............................................................................................................. 1
B. General Description.................................................................................................. 1
C. Principles of Operation............................................................................................. 2
D. Technical Specifications........................................................................................... 3
II. InstallationandOperation.................................................................................................. 4
A. ReceivingtheMS2500ETransmitter ........................................................................... 4
B. Installation .................................................................................................................. 4
1. MechanicalMounting............................................................................................ 4
Figure1. PreferredInstallation ........................................................................... 5
2.ElectricalConnection .............................................................................................. 5
C. SafeAreaWiring ........................................................................................................ 6
D. HazardousAreaWiring............................................................................................... 6
1. ProbeSelectionTerminals ..................................................................................... 7
2. Calibration............................................................................................................ 7
Figure2. CalibrationConnections ...................................................................... 8
Figure 3. Switch Locations................................................................................ 9
3. Operation ............................................................................................................. 9
Figure4.Output LinearRelationship .................................................................. 10
4. DeterminingCorrosionRate .................................................................................. 10
E. SelectingtheProbe ..................................................................................................... 10
1. ProbeReplacementCalculation............................................................................. 10
F. Maintenance ............................................................................................................... 11
G. ReturningtheInstrumentforRepair ............................................................................. 12
III. MaintenanceandRepairInstructions.................................................................................. 13
IV. WarrantyInformation ........................................................................................................ 15
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1
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).
2
C. Principles of Operation
Electrical resistance probes contain a continuous sensing device that is divided into “elements”
connected in series. These elements include a measuring element and a reference element. The
measuring element is exposed to the corroding environment. The resulting loss of metal de-
creases the measuring element’s thickness and causes an increase in this element’s resistance.
The reference element is protected from the corroding environment and retains its original
thickness and resistance. The MS2500E Transmitter is powered by a customer-supplied 10-35V
DC power source. As the probe’s measuring element corrodes, the Transmitter sends to the data
receiving station a proportional 4-20mA signal that represents the element’s metal loss.
The measurement technique employed by the Transmitter eliminates electrical resistance
changes due to temperature fluctuations by measuring the ratio of the exposed measuring
element’s resistance to that of the protected reference element’s resistance exposed. This ratio
then regulates Transmitter output current (4-20mA) such that it represents the metal lost by the
exposed element. For example, a Transmitter output current of 4mA indicates 0 (zero) corro-
sion. An output current measurement of 20mA indicates the end of probe life.
The Transmitter’s 4-20 mA current range is “divided” into 1,000 probe reading units. A single
unit represents 0.001 of probe life. Probe life is equivalent to the amount of metal that the
measuring element can lose during the useful life of the probe. Initial probe measurements
taken when the probe is first installed will be at approximately 0 to 100 units. The maximum
probe measurement (20 mA) is equivalent to 1000 units.
Expectedprobelife forelements presentlyavailable fromMetal Samplesarelistedinthe tablebelow.
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efiLevitceffE
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pooLralubuT42
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pooLeriW0401
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lacirdnilyC015
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csiDhsulF55.2
015
3
D. Technical Specifications
Model
MS2500E- Loop-PoweredERTransmitter (Ordering # IN2500)
Physical Data
InstrumentWeight: 5.02 lb. (2.28 Kg)
TotalWeightw/Accessories: 7.08 lb. (3.21 Kg)
InstrumentDimensions: 5.81"Hx 4.5"Wx 4.81"D (14.76cm x 11.43cmx 12.22cm)
CaseSpecifications: ExplosionProof (FM, CSA, CENELEC, UL)
Class I, Groups B, C, D, Class II, Groups E, F, G, Class III,
CENELEC: EexdIIC
NEMA 4X, 7BCD, 9EFG
MountingSpecifications: 0.728"Hx 1.756"W (1.85cm x4.46cm)Bolt Pattern with 1/4-
20TappedMounting Holes, or May Be Mounted on a 1/2" to
2"(1.27cm to 5.08cm)Pipe Using SuppliedHardware
OperatingTemperature: 0° to 140°F (-18° to 60°C)
StorageTemperature: -40° to 176°F (-40° to 80°C)
PerformanceData
MeasurementType: ERmeasurementusing anystandard ERprobe type(Wire
Loop,TubeLoop,Cylindrical, Flush,Strip,etc.)
Range: 0-100%of probe life
Resolution: 0.4%of FullScale
CycleTime: 1Minute
Electrical Data
PowerRequirements: 10 to 35 VDC
MaximumProbeCableDistance: 5 ft (1.52 m)
OutputSpecifications: 4-20mACurrent Loop Output
IntrinsicSafety: Certifiedto CAN/CSA
STD E9-0-95 & E79-11-95
ClassI,Division 1,
Groups C and D, T4
Special Features
• Switchselectable probetype (wireloop,tube loop,cylindrical, etc.)
• Loop powered
Accessory Items
5'Probe Cable (attached), MeterProver,Mounting Hardware,Operation Manual
4
II. Installation and Operation
A. Receiving the MS2500E Transmitter
Check the MS2500E Transmitter for damage when it is first received. Obvious damage to the
shipping carton should be brought to the attention of the responsible carrier’s agent.
When the MS2500E is unpacked, verify that the shipping carton contains the following items:
1. MS2500E Transmitter
2. 5' Cb-8140 Probe Cable (attached to housing)
3. Meter Prover
4. MS2500E Transmitter Operator’s Manual
B. Installation
Installation of the MS2500E Transmitter involves the following three procedures:
1. Mechanical Mounting
2. Electrical Connection
3. Calibration
Caution: If the transmitter is to be installed in a safe area, complete the three installation proce-
dures in the order listed above. However, if the transmitter is to be installed in a hazardous area,
complete the calibration procedure first; then follow with the mechanical mounting procedure
and the electrical wiring procedure.
1. Mechanical Mounting
The MS2500E must be mounted on a flat surface connected to earth ground. Locate it within 5
feet of the installed probe and connect the transmitter to the probe via Cb-8140 connection
cable. The transmitter will not function properly if cable other than Cb-8140 is used or of
extension cable is added.
Note: If the transmitter is to be located in a nonhazardous area, allow sufficient vertical clear-
ance for the removal of the enclosure top so that wiring and calibration procedures can be
completed. See Drawing 1 for MS2500E dimensions.
5
Figure 1. Preferred Installation
2. Electrical Connection
The current loop cable used to connect the MS2500E Transmitter with its power supply must be
a twisted pair, shielded, industrial gauge cable. The current loop cable enters the MS2500E via
the Transmitter’s 1/2-inch NPT access hole and is connected to the two loop connection termi-
nals located within the Transmitter enclosure. Polarity is critical when attaching the cable to the
MS2500E loop connection terminals. The loop connection terminals are easily accessed by
unscrewing the top of the Transmitter’s enclosure.
Caution: Do not connect cable shielding to the Transmitter. The shield must remain floating at
the Transmitter.
The maximum permissible length of the current loop cable that connects the Transmitter and its
power supply is determined by the power supply voltage, the electrical resistance of the current
loop cable and the load of the receiver/CPU. If the Transmitter is to be installed in a safe area,
refer to the paragraph Safe Area Wiring for details; if the Transmitter is to be installed in a
hazardous area, refer to Hazardous Area Wiring instructions.
6
C. Safe Area Wiring
For basic safe area wiring information, refer to the circuit diagram shown in Drawing 2. Use
the following equation to determine maximum permissible cable length:
Where:
D = Max. cable length in feet.
VS= Power supply voltage.
R = Cable resistance in ohms per 1000 feet.
Example:
VS= 24 Volts
R = 16.1 (22 AWG cable)
D. Hazardous Area Wiring
Whenever an electrically driven sensor or measuring device is used in a potentially explosive
environment the measuring system must be installed in such a way that electrical energy is
either effectively isolated from the explosive environment (via explosive-proof containers,
cable conduits, etc.) or the amount of electrical energy produced in the hazardous area must be
limited to an intrinsically safe level.
Limiting electrical energy is the most practical method of protecting the MS2500E measuring
system when the Transmitter is installed in a hazardous area. In the MS2500E system, electri-
cal energy limits are maintained by the use of a repeater safety barrier (or its equivalent)
installed in the 4-20 mA current loop per standard practice. The safety barrier must be located
in the safe area near the boundary between the safe and hazardous areas. The safety barrier will
Vs- 10
(4 x 10-5) (R)
D =
D =
24 - 10
(4 x 10-5) (16.1)
D = = 21,739 feet
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