ITT BARTON 763A User Manual

BARTON MODEL 763A

GAGE PRESSURE TRANSMITTER

User Manual

Part No. 9A-C10861, Rev. 03

Contents

Safety ............................................................................................................ 2

Section 1—Introduction ................................................................................. 3

General ......................................................................................................... 3

Product Description....................................................................................... 3

Gage Pressure Transducer Assembly ....................................................... 3

Electronic Transmitter................................................................................ 3

Power Supply ............................................................................................ 3

............................................................................................... 4

Performance .............................................................................................. 4

Application ................................................................................................. 5

Storage ......................................................................................................... 6

Section 2—Theory of Operation .................................................................... 7

Basic Components ........................................................................................ 7

Gage Pressure Sensing Element .............................................................. 7

Electronic Transmitter................................................................................ 7

Basic Operation ............................................................................................ 7

Reverse Polarity Protection ....................................................................... 7

Regulator ................................................................................................... 9

Strain Gage Bridge Network...................................................................... 9

.......................................................................................... 9

........................................................................................ 9

Temperature Compensation.......................................................................... 9

Section 3—Installation and Operation .........................................................11

Unpacking/Inspection...................................................................................11

Pre-Operating Instructions ...........................................................................11

Mounting ......................................................................................................11

Vibration ...................................................................................................11

Piping .......................................................................................................... 12

Distance .................................................................................................. 12

July 2010

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Slope ....................................................................................................... 12

Process Temperature .............................................................................. 12

Pulsation.................................................................................................. 12

Leakage................................................................................................... 12

Manifolding.................................................................................................. 13

Electrical Connections ................................................................................ 13

Load and Line Resistance Calculations .................................................. 14

EMI/RFI Shielding ....................................................................................... 15

Initial Calibration Adjustments ..................................................................... 16

Calibration Check .................................................................................... 16

Startup Procedure ................................................................................... 18

Shutdown Procedure ............................................................................... 18

Section 4—Maintenance .............................................................................. 19

General Field and Periodic Maintenance .................................................... 19

Periodic Calibration ..................................................................................... 19

Transmitter Cover Removal ........................................................................ 21

Transmitter Cover Reinstallation ............................................................. 21

Operation of the EGS Quick Disconnect Connector Assembly................... 22

Leadwire/Connector Replacement.............................................................. 23

Removal of the EGS Quick Disconnect Connector Assembly................. 23

Installation of the EGS Quick Disconnect Connector Assembly.............. 23

Removal of the Barton Style Connector Assembly.................................. 24

Installation of the Barton Style Connector Assembly............................... 24

Troubleshooting .......................................................................................... 26

Section 5—Assembly Drawing and Parts List ........................................... 27

Section 6—Dimensional Drawings ............................................................. 29

Safety

Before installing this product, become familiar with the installation instruc­tions presented in Section 3 and all safety notes throughout.

WARNING: This symbol information about practices or circum-

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stances that can lead to personal injury or death, property damage, or
economic loss.

CAUTION: Indicates actions or procedures which if not performed correctly

IMPORTANT: Indicates actions or procedures which may affect instrument operation or

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may lead to personal injury or incorrect function of the instrument
or connected equipment.

may lead to an instrument response that is not planned.

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Model 763A Gage Pressure Transmitter Section 1

Section 1—Introduction

General

The Model 763A Gage Pressure Transmitter provides a 4-20 mA or 10-50 mA
proportional-to-gage-pressure signal for transmission to remote receiving,
control, or readout devices.

The electronic components of the 763A are housed in a pressure-sealed enclo­sure. The instruments are designed to operate beyond their normal operating

­ment of a nuclear power plant under adverse accident and post-accident
conditions. These adverse environments include severe changes in ambient
pressure, temperature and humidity, seismic events, and radiation exposure.

Product Description

Gage Pressure Transducer Assembly

The pressure-sensing element is a C-type Bourdon tube that actuates the elec­tronic transmitter circuit. The pressure elements are available in Haynes Alloy
#25, which is compatible with most process media requirements and available
in ranges between 0-300 psig and 0-3,600 psig.

WARNING: Do not tamper with the Bourdon tube inside the enclosure or

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the delicate wires connected to it (Figure 3.4, page 16). Improper handling
can damage connections and cause the transmitter to be inoperable.

Electronic Transmitter

The electronic transmitter supplies either a 4-20 mA or a 10-50 mA direct
current output signal that is proportional to the gage pressure sensed by the
Bourdon tube. The output signal is transmitted over a two-wire transmission
line to remote receiving devices.

Power Supply

A regulated direct current (DC) power supply is required to operate the trans­mitting loop.

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Section 1 Model 763A Gage Pressure Transmitter

Performance

Available Spans .............................. 0-300 to 0-3,600 psig

Output ............................................. 4-20 mA or 10-50 mA

Reference Accuracy* ...................... ±0.5% of factory calibrated span, including the

Adjustability ....................................

Sensitivity* ...................................... ±0.01% of factory calibrated span

Power Requirements ...................... 15 VDC plus 2 VDC per 100 Ohm load to 53 VDC

Load Range

(includes line and receiver)............. 50 Ohms per volt above 15 VDC (4-20 mA)

Load Effect* .................................... < ±0.05% of factory calibrated span per 100 Ohm

Power Supply Effect* ...................... < ±0.025% of factory calibrated span per 1 Volt

Noise* ............................................. < 0.25% peak-to-peak of factory calibrated span

Zero Elevation ................................ Factory adjusted to 14.7 psig

Thermal Effect* (combined

effect on zero and span) ................. < ±1.0% of factory calibrated span per 100°F change

Radiation* ....................................... ±10.0% error for exposures to 2 x 10

Seismic:

During Event* .............................< ±5.0% error (0-300 to 0-3,600 psig spans)

After Event* ................................< 1.5% error (0-300 to 0-500 psig spans)

< ±0.5% error (0-500 to 0-3,600 psig spans)

LOCA Performance* .......................

effects of conformance (non-linearity), deadband,
hysteresis, and repeatability

without affecting normal or accident condition perfor-

up to 30% suppression. Zero or Span adjustments
beyond ±5% affect normal and accident condition
performance.Calibration is by the end-point method
with zero and full scale outputs held to ±0.05% of
true.

maximum (4-20 mA)
15 VDC plus 5 VDC per 100 Ohm load to 53 VDC
maximum (10-50 mA)

20 Ohms per volt above 15 VDC (10-50 mA)

change (4- 20 mA)
< ±0.1% of factory calibrated span per 100 Ohm
change (10-50 mA)

change (4-20 mA)
< ±0.05% of factory calibrated span per 1 Volt
change (10-50 mA)

from +40°F to +150°F
< ±1.5% of factory calibrated span per 100°F change
from +150°F to +320°F

Gamma
±5.0% error for exposures to 5 x 10

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Rads TID

7

Rads TID

Gamma

(420°F)
< ±10.0% error thereafter to the conclusion of the
LOCA test, as performed per Document No.
9A-CR3-763-6.

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Model 763A Gage Pressure Transmitter Section 1

The LOCA errors include the cumulative effects of
thermal, mechanical, radiation, and seismic aging,

Long Term Drift* .............................. ±1.0% of factory calibrated span per year, cumula-

Time Response .............................. < 180 msec. to reach 50% for 10% to 90% step

Maximum Overpressure ................. 150% of factory calibrated span without damage

Process Connection ....................... 1/2" NPT (female)

Electrical Interface .......................... 2-wire (16 AWG) pigtail (20' long)

Weight ............................................ 11 pounds

as performed per Document No. 9A-CR3-763-6.

tive

function

IMPORTANT: The 763A transmitter has no integral electronic interference suppression

features. If an instrument is to be installed in an area containing EMI/RFI
sources and this interference cannot be tolerated, take precautions to
protect the transmitter signal. See also EMI/RFI Shielding, page 15.

Application

The Model 763 Gage Pressure Transmitter was subjected to IEEE 323-

functional service in a harsh environment (LOCA/MSLB). Subsequent to the

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sembly, using a Bourdon tube/strain gage and connecting wire assembly, has

identical to the Model 763, based on additional analysis.

The service conditions associated with the Model 763A transmitter nuclear

(accelerated aging for

1,830 hours at 257°F) ..................... 100 years at normal conditions of 104°F

Radiation Exposure ........................ 200 x 10

DBE Environment ........................... Two 10-second temperature ramps to 486°F maxi-

Long Term

Severe Environment ....................... 85 days at 200°F and 95% RH

.................... OBE @ 9.0 G (series of 5)

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60 years at normal conditions of 113°F
40 years at normal conditions of 122°F
26 years at normal conditions of 131°F
11 years at normal conditions of 140°F

mum; 24 hour duration chemical spray exposure;
15 day total exposure to saturated steam at 250°F
minimum

SSE @ 12.5 G
5% critical damping
no resonance in frequencies below 75 Hz

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Rads (TID Gamma)

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Section 1 Model 763A Gage Pressure Transmitter

Mechanical Aging ........................... 500,000 pressure cycles during accelerated aging;

Cycled electrically to induce stress during acceler­ated aging;
Vibration cycling using 0.2 G sweeps over the 1-100
Hz range @ 1.0 octave/min.

Storage

Storage per ANSI N45.2.2-1978 Level B @ 70°F (20°C) ±20°F (±11°C) in
factory-sealed package for 2.5 years maximum will not affect installed service
life.

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Model 763A Gage Pressure Transmitter Section 2

Section 2—Theory of Operation

Basic Components

Gage Pressure Sensing Element

The C-type Bourdon tube is an arc-shaped metal tube that is elliptical in
cross-section and sealed at one end. The opposite end, which is open, is at­tached to the pressure source. Pressure applied inside the tube affects its shape
and actuates the sensing element.

Electronic Transmitter

The 763A uses a wire (larger gage than that used in the Model 763 transmit­ter) that is welded to the Bourdon tube and cantilever beam. Increased inter­nal pressure applied to the Bourdon tube tends to straighten the tube, which in
turn bends the cantilever beam proportionally. Motion of the free end of the
beam applies tension to one gage, increasing its resistance, and compression
to the other, decreasing its resistance. The two gages are connected to form
two active arms of a bridge circuit. The bridge output signal is conditioned
and converted to a 4-20 mA or 10-50 mA output signal by the transmitter
electronics.

Basic Operation

The electronic transmitter is basically a loop current regulating device, where
loop current is controlled by an input of mechanical force or motion. Figure

2.1, page 8
the electrical currents. As shown, the transmitter, power supply, and load (line
plus receiving device) are connected in series.

The current from the power supply enters the transmitter, passes through the
reverse polarity protecting diode, then divides into two separate paths. The

The remainder of the current passes through the electronic regulator, where it
divides into two paths, then passes through the bridge circuit and the voltage

through the load and back to the power supply.

Reverse Polarity Protection

Reverse input polarity protection is provided by the forward-conducting
diode. In the event the polarity of the input is reversed, the diode blocks the
input and prevents the reversed input power from damaging the electronic
circuit components.

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Section 2 Model 763A Gage Pressure Transmitter

Figure 2.1—Operational block diagram

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Model 763A Gage Pressure Transmitter Section 2

Regulator

This stage of the circuit regulates the portion of the loop current that is not

Strain Gage Bridge Network

The strain gage bridge network consists of two silicon piezo-resistive strain
sensors, the zero adjusting potentiometer, bridge completion resistors, and the
temperature compensation components.

current. The amount of current is precisely regulated with the feedback net­work to be proportional to the bridge output.

Temperature Compensation

The 763A is temperature compensated at the factory. Only those repairs

IMPORTANT Combined zero and/or span changes more than ±5% of the factory

calibration can adversely impact transmitter performance. The transmitter
performance may be decreased in direct proportion to the changes to the
factory calibration. If the combined zero and/or span changes represent
a change in the factory calibration by a factor of 2, the transmitter perfor­mance may be decreased by a factor of 2.

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Section 2 Model 763A Gage Pressure Transmitter

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