Rosemount 1151 Operating Manual

00809-0100-4360

English

Rev. AA

Model 1151 Alphaline® Pressure Transmitters

Product Manual

Model 1151 Alphaline® Pressure Transmitters

NOTICE

Read this manual before working with the prod uc t. For perso nal and system safety, and for optimum product performance, make sure you thoroughly understand the conten ts before installing, using, or maintaining this product.

Within the United States, Rosemount Inc. ha s two tol l-free assistance numbers. Customer Central: 1-800-999-9307 (

Technical support, quoting, and order-related questions.

North American 1-800-654-7768 ( Response Center: Equipment service needs.

For equipment s ervice or s upport n eeds outs ide th e United State s, cont act your local Rosemount representative.

7:00 a.m. to 7:00 p.m. CST)

24 hours a day – Includes Canada)

Rosemount In c.

http://www.rosemount.com

The products described in this document are NOT designed for nuclearqualified applications.

Using non-nuclear qua lifi ed products in applications that require nuclearqualified hardware or products may cause inaccurate readings.

For information on Rosemount nucle ar-qualified products, contact you r local Rosemount Sales Representative.

May be protected by one or more of the following U.S. Patent Nos. 3,195 ,028; 3,271,669; 3,318,15 3; 3,618,390; 3,646,538; 3,793,885; 3,800,413; 3,854,039; 3,859,594; 3,975,719; 4,339,750; 5,237,285; Re. 30,603. May Depend on Model. Other U.S. and Foreign Patents Issued and Pending.

Rosemount, the Rosemount logotyp e, Alphaline, and SMART FAMILY are registered trademarks of Rosemount Inc. HART is a registered trademark of the HART Communication Foundation.

-Cell is a trademark of Rosemount Inc. Hastelloy, Hastelloy C, and Hastelloy C-276 are registered trademarks of Cabot Corp. Monel is a registered trademark of International Nickel Co. Teflon is a registered trademark of E.I. du Pont de Nemours & Co. Aflas is a registered trademark of Asahi Glass Co., Ltd. Kynar is a trademark of Pennwalt Inc. Flourolube is a registered trademark of Hooker Chemical Co. Loctite is a registered trademark of Loctite Corporation.

Cover Photo: 1151-001AB

Fisher-Rosemount satisfies all obligations coming from legislation to harmonize product requ ireme n ts in th e Euro pe a n Union.

SNF-0004

Table of Contents

Introduction

Installation

Using This Manua. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Model 1151 Alphaline® Pressure Transmitters . . . . . . . . . . . . . . 9

Transmitter overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

General Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Mechanical Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Environmental Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Access Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Process Flange Orientation . . . . . . . . . . . . . . . . . . . . . . . 13

Housing Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Terminal Side of Electronics Housing . . . . . . . . . . . . . . . 13

Circuit Side of Electronics Housing . . . . . . . . . . . . . . . . . 13

Exterior of Electronics Housing . . . . . . . . . . . . . . . . . . . 13

Mounting Effects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Process Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Mounting Brackets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Mounting Requirements (for Steam, Liquid, Gas) . . . . . . . . 17

Taps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Drain/Vent Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Impulse Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Electrical Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Conduit Sealing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Signal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Transmitter Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Grounding Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Hazardous Locations Certifications. . . . . . . . . . . . . . . . . . . . 24

Liquid Level Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Open Vessels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Closed Vessels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Dry Leg Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Wet Leg Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Bubbler System in Open Vessel . . . . . . . . . . . . . . . . . . . . 26

Calibration

Quick Calibration Procedure (for E, G, and J Electronics). . . . . 29

Quick Calibration Procedure (For L and M Electronics) . . . . . . 29

Data Flow with Calibration Options . . . . . . . . . . . . . . . . . . . . . . 31

Span Adjustment Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Zero Adjustment Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Zero and Span Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Elevated or Suppressed Zeros . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Linearity Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Damping Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Static Pressure Span Correction Factor . . . . . . . . . . . . . . . . . . . . 37

Options

Mounting Brackets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

(Option Codes B1–B7 and B9) . . . . . . . . . . . . . . . . . . . . . 39

Analog Meters (4–20 ma only) . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

LCD Meters (4–20 ma only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

LCD Meter Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Remove the Cove . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .r 42

Position the Decimal Point and Select the Meter Function 42

Store the Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Set the Display Equivalent to a 4 mA Signal . . . . . . . . . 43

Set the Display Equivalent to a 20 mA Signal. . . . . . . . 43

Replace the Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

LCD Meter Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

LCD Meter Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Terminal Blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Filter Terminal Block (Option Code R2) . . . . . . . . . . . . . . . . 46

Transient Protection and Filter Terminal Block

(Option Code R1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Retrofitable Transient Terminal Block(Option Code R9). . . 46

R9 Terminal Block Installation . . . . . . . . . . . . . . . . . . . . 47

Terminal Block Specifications (for R1, R2, and R9) . . . . . . . 49

Maintenance and Troubleshooting

Specifications and Reference Data

Hardware Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Transmitter Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

54 Process Sensor Body Removal 55

Removing the Sensor from the Electrical Housing . . . . 56

Sensor Module Checkout . . . . . . . . . . . . . . . . . . . . . . . . . 57

Reassembly Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Preliminary Precaution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Connecting the Electrical Housing to the Sensor. . . . . . . . . 58

Backup Ring and O-ring Installation . . . . . . . . . . . . . . . . . . 58

Optional Plug-in Meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .s 60

Return of Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Performance Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Physical Specifications (Standard Configuration). . . . . . . . . . . . 68

Section

1 Introduction

USING THIS MANUAL

This manual is designed to assist in installing, operating, and maintaining the Rosemount Model 1151 Analog Pressure Transmitter Family.

Section 2 Installation

provides mechanical and electrical installation instructions.

Section 3 Calibration

explains technique for calibration of the device.

Section 4 Options

explains the options available for the Model 1151, including mounting brackets, LCD meters, custom configuration, transient protection, and filter terminal blocks.

Section 5 Maintenance and Troubleshooting

describes trim procedures and offers troubleshooting instructions for dealing with potential mechanical or electrical difficulties.

Section 6 Specifications and Reference Data

lists functional, performance, and physical specifications data as well as ordering information for the transmitter.

Appendix A Approval Drawings

contains approval drawings for Canadian Standards Association (CSA) and Factory Mutual (FM) intrinsic safety drawings.

Glossary

provides brief definitions of the terms use d in this manual and tells where to find more information.

MODEL 1 151 ALPHALINE® PRESSURE TRANSMITTERS

Index

contains a comprehensive, standard index.

This manual describes the following Model 1151 Alphaline® Pressure Transmitters.

• Model 1151DP— Differential Pressure Transmitter measures differential pressure from 6 inH (1.493 to 6895 kPa).

• Model 1151HP— Differential Pressure Transmitter for High Line Pressures measures high line pressures from 25 inH

• Model 1151GP— Gage Pressure Transmitter measures gage pressure from 6 inH 41369 kPa).

• Model 1151AP— Absolute Pressure Transmitter measures absolute pressure from 25 inH 6895 kPa).

O to 300 psi (6.22 to 2668 kPa).

O to 6,000 psi (1.493 to

O to 1,000 psi

O to 1,000 psi (6.22 to

1-1

Model 1151 Alphaline® Pressure Transmitters

TRANSMITTER OVERVIEW

The Rosemount Model 1151 Alphaline® series of pressure transmitters has set an industry standard as the largest-selling transmitter in the world. It brings true precision to the measurement of flow, level, gage and absolute pressures, vacuum, and specific gravity.

With proven performance, quality, and reliability, the Model 1151 provides accurate measurement using the variable capacitance principle. It is virtually unaffected by changes in temperature, static pressure, vibration, and power supply voltage.

Installation, calibration, and commissioning are simplified by the transmitter’s compact design, integral junction box, and local span and zero adjustments. Its modular design and high degree of interchangeability result in a minimal investment for spare parts.

1-2

Section

2 Installation

This section covers areas to consider when installing the Model 1151 Analog Transmitter:

• General Considerations

• Mechanical Considerations

• Environmental Requirements

• Electrical Considerations

• Liquid Level Measurement

GENERAL CONSIDERATIONS

MECHANICAL CONSIDERATIONS

The accuracy of a flow, pressure, or level measurement depends on proper installation of the transmitter and impulse piping. The piping between the process and transmitter must accurately transmit process pressure to the transmitter. Mount the transmitter close to the process and use a minimum of piping to achieve best accuracy. Keep in mind, however, the need for easy access, safety of personnel, practical field calibration, and a suitable transmitter environment. In general, install the transmitter so as to minimize vibration, shock, and temperature fluctuations.

Installations in food, beverage, and pharmaceutical processes may require sanitary seals and fittings. Regulations may dictate special installation requirements needed to maintain sanitation and cleanability considerations. See Product Data Sheet 00813-0100-4016 for more information about sanitary pressure instruments from Rosemount Inc.

Rosemount Model 1151DP, GP, HP, and AP transmitters may be mounted in several ways. They may be panel-mounted, wall-mounted, or attached to a 2-inch pipe through an optional mounting bracket. Figure 2-1 shows the transmitter dimensions. The following paragraphs discuss factors necessary for a successful transmitter installation.

2-1

Model 1151 Alphaline® Pressure Transmitters

FIGURE 2-1. Dimensional Drawing for Model 1151 Transmitter.

Flange Distance “A”

Range

3, 4, 5 2.125 54

6, 7 2.188 56

82.250 57

92.281 58

02.328 59

Center to Center

inches mm

½–14 NPT

Conduit

Connection

(2 Places)

Meter

Housing

Terminal Connections

This Side

¼–18 NPT on

Flanges for Pressure

Connection without

Flange Adapters

½–14 NPT on

Flange

Adapters

7.5 (191) Max.

with Optional Meter

4.5 (114) Max.

(See Table)

4.5 (114) Max.

0.75 (19) Clearance for Cover Removal (Typical)

Transmitter Circuitry This Side

1.625 (41)

Blank Flange Used on AP and GP Transmitters

Permanent Tag (Optional)

NOTE Dimensions are in inches (millimeters).

2-2

Wired-on

(Standard)

¼–18 NPT for

Side Drain/Vent

(Optional Top

or Bottom)

Flange

Adapter

Tag

4.5 (114)

3.375 (86)

9.0 (229) Max.

Nameplate

Drain/Vent

Valve

3.69 (94)

Flanges Can Be Rotated

1151-1151A,B05A

Installation

ENVIRONMENTAL REQUIREMENTS

Mount the transmitter to minimize ambient temperature changes. The transmitter electronics temperature operating limits are –40 to 200 °F (–40 to 85 °C) for “E” output options, –20 to 150 °F (–29 to 66 °C) for “J” output options, and –20 to 200 °F (–29 to 93 °C) for G, L, and M output options. Section 5 Maintenance and Troubleshooting lists the sensing element operating limits. Mount the transmitter to avoid vibration and mechanical shock, and to avoid external contact with corrosive materials.

Access Requirements

When choosing an installation location and position, take into account the need for access to the transmitter.

Process Flange Orientation Orient the process flanges to enable process connections to be made.

For safety reasons, orient the drain/vent valves so that process fluid is directed down and away from technicians when the valves are used. This can be accomplished by pointing the hole in the outside valve body downward and away. In addition, consider the need for a testing or calibration input.

Do not rotate the transmitter housing more than 90 degrees without disconnecting the header board. Exceeding 90 degrees rotation will damage the internal sensor module wiring. Refer to Removing the Sensor from the Electrical

Housing on page 5-6 for further information.

Housing Rotation The electronics housing may be rotated up to 90 degrees to improve

field access to the two housing compartments. T o rotate the housing less than 90 degrees, loosen the housing lock nut and turn the housing not more than 90 degrees from the orientation shown in Figure 2-1. To rotate the housing more than 90 degrees, follow th e transmitter disassembly procedures in Section 5 Maintenance and Troubleshooting.

Terminal Side of Electronics Housing

Make wiring connections through the conduit openings on the top side of the housing. The terminal side of the housing is marked on the nameplate located on the side of the transmitter. Mount the transmitter so that the terminal side is accessible. A ¾-inch clearance is required for cover removal with no meter. A 3-inch clearance is required for cover removal if a meter is installed. If practical, provide approximately 6 inches clearance so that a meter may be installed later.

Circuit Side of Electronics Housing

The circuit compartment should not routinely need to be opened when the unit is in service; however, provide 6 inches clearance if possible to allow access for on-site maintenance. The circuit side of the housing is marked on the nameplate located on the side of the transmitter.

Exterior of Electronics Housing The analog Model 1151 uses local span and zero screws, which are

located under the nameplate on the side of the transmitter . Please allow 6 inches clearance if possible to allow access for on-site maintenance.

2-3

Model 1151 Alphaline® Pressure Transmitters

Mounting Effects

The analog Model 1151 weighs 12 lb (5.4 kg) for AP, DP, GP, and HP transmitters, excluding options. This weight must be securely supported; see Figure 2-2 on page 2-6 for mounting bracket information. The transmitter is calibrated in an upright position at the factory. If this orientation is changed during mounting, the zero point will shift by an amount equivalent to the liquid head caused by the mounting position. Zero and Span Adjustment on page 3-6 describes how to correct this shift.

Process leaks can cause death or serious injury. Only use bolts supplied with the transmitter or sold by Rosemount Inc. as a spare part. Using unauthorized bolts may reduce pressure retaining capabilities and render the instrum ent dangerous.

Do not plug the low side with a solid plug. Plugging the low side will cause an output shift.

Process Connections

Model 1151AP, DP, GP, and HP process connections on the transmitter flanges are ¼–18 NPT. Flange adapter unions with ½–14 NPT connections are supplied as standard. These are Class 2 threads; use plant-approved lubricant or sealant when making the process connections. The flange adapters allow users to disconnect from the process by removing the flange adapter bolts. Figure 2-1 on page 2-2 shows the distance between pressure connections. This distance may be

varied ±

/8 inch (3.2 mm) by rotating one or both of the flange adapters.

To ensure a tight seal on the flange adapters or three-valve manifold, first finger-tighten both bolts, then wrench-tighten the first bolt to approximately 29 ft-lbs (34 Nm). Wrench-tighten the second bolt to approximately 29 ft-lbs (34 Nm).

2-4

Process leaks can cause death or serious injury. Install and tighten all four flange bolts before applying pressure, or process leakage may result. When properly installed, the flange bolts will protrude through the top of the module housing. Attempting to remove the flange bolts while the transmitter is in service may cause process fluid leaks.

Failure to install flange adapter O-rings can cause process leaks, which can result in death or serious injury.

There are two styles of Rosemount flange adapters, each requiring a unique O-ring, as shown below. Each flange adapter is distinguished by its unique groove.

MODEL 3051/2024/3001/3095

Flange Adapter

O-ring

Installation

Unique O-ring

Grooves

Flange Adapter

O-ring

MODEL 1151

Use only the O-ring designed to seal with the corresponding flange adapter.

Refer to the Spare Parts List on page 6-13 for the part numbers of the flange adapters and O-rings designed for the Model 1151 Pressure Transmitter.

NOTE

If Teflon O-rings are used, they should be replaced if the f lange adapter is removed.

The low-side process flange has a ¼–18 NPT connection. A flange adapter union is supplied for ½–14 NPT process connections. The flange adapter allows the transmitter to be easily disconnected from the process by removing the flange adapter bolts. On open vessels the lowside process flange is open to atmosphere and should be mounted with the threaded hole pointed down. On closed vessels this connection is used for the dry or wet leg.

Mounting Brackets

An optional mounting bracket permits mounting the transmitter to a wall, a panel, or a 2-inch horizontal or vertical pipe. Figure 2-2 illustrates some typical configurations using these mounting brackets.

2-5

Model 1151 Alphaline® Pressure Transmitters

FIGURE 2-2. Mounting Bracket Options.

3.75 (95)

1.65 (42)

2.81 (71)

1.65 (42)

3.87 (98)

2.625 (67)

2.62 (67)

4.97

(127)

5.625 (143)

2.625 (67)

PIPE MOUNTING BRACKET OPTION CODES B1, B4, AND B7

3.87 (98)

Mounting Holes

0.375 Diameter (10)

2.81 Typ. (71)

1.40 (46)

2.81 Typ. (71)

4.5 (114)

1.40 (36)

PANEL MOUNTING BRACKET OPTION CODES B2 AND B5

5.625 (143)

3051-3051D19A, 1151-1151D,B06C

2.81 Typ. (71)

2.625 (67)

3051-3051B19A, 1151-0244A, 1151-1151E06A

2.125 (54)

1.62 (41)

NOTE Dimensions are in inches (millimeters).

2-6

8 (203)

2.81 (71)

FLAT MOUNTING BRACKET OPTION CODES B3, B6, AND B9

3051-3051H19B, 1151-1151F06B

Installation

Mounting Requirements

The following information applies to steam, liquid, and gas installations.

(for Steam, Liquid, Gas)

Taps Different measurement conditions call for different piping

configurations. For liquid flow measurement, place taps to the side of the line to prevent sediment deposits, and mount the transmitter beside or below these taps so gases can vent into the process line. For gas flow measurement, place taps in the top or side of the line and mount the transmitter beside or above the taps so liquid will drain into the process line. For steam flow measurement, place taps to the side of the line with the transmitter mounted below them to ensure that the impulse piping stays filled with condensate. See Figure 2-3 for a diagram of these arrangements.

FIGURE 2-3. Steam, Liquid, and Gas Service Installation Diagrams.

Blocking

Flow

Valves

Plugged Tee for Steam Service for Sealing Fluid

Optional Side-

mounted Drain/

Vent Valve

LIQUID SERVICE

3-valve Manifold

GAS SERVICE

Vent/Drain

Valve

Sufficient

Length for

Cooling

STEAM SERVICE

3-valve

Manifold

NOTE For steam service do not blow down impulse piping through transmitter. Flush lines with blocking valves closed and refill lines with water before resuming measurement.

Flow

3-valve

Manifold

Flow

Drain/Vent

Valve

3-valve Manifold

Drain/Vent Valves For transmitters with side drain/vent valves, place taps to the side of

the line. For liquid service, mount the side drain/vent valve upward to allow the gases to vent. For gas service, mount the drain/vent valve down to allow any accumulated liquid to drain. T o change the drain/vent valve orientation from top to bottom, rotate the process flange 180 degrees.

1151-1151D,A,B,C01A

Steam or other elevated temperature processes can cause damage to the sensor. Do not allow the temperature inside the process flanges to exceed the transmitter limit of 220 °F (104 °C).

In steam service, lines should be filled with water to prevent contact of the live steam with the transmitter.

2-7

Model 1151 Alphaline® Pressure Transmitters

Impulse Piping The piping between the process and the transmitter must accurately

transfer the pressure in order to obtain accurate measurements. In this pressure transfer , there are five possible sources of error: leaks, friction loss (particularly if purging is used), trapped gas in a liquid line, liquid in a gas line, and temperature-induced or other density variation between the legs.

The best location for the transmitter in relation to the process pipe depends on the process itself. Co nsider th e f ollowing gene ral guidelines in determining transmitter location and placement of impulse piping:

• Keep impulse piping as short as possible.

• Slope the impulse piping at least 1 inch per foot (8 centimeters per meter) upward from the transmitter toward the process connection for liquid.

• Slope the impulse piping at least 1 inch per foot (8 centimeters per meter) downward from the transmitter toward the process connection for gas.

• Avoid high points in liquid lines and low points in gas lines.

• Make sure both impulse legs are the same temperature.

• Use impulse piping large enough to avoid friction effects and prevent blockage.

• Vent all gas from liquid piping legs.

• When using a sealing fluid, fill both piping legs to the same level.

• When purging is necessary, make the purge connection close to the process taps and purge through equal lengths of the same size pipe. Avoid purging through the transmitter.

• Keep corrosive or hot process material out of direct contact with the sensor module and flanges.

• Prevent sediment deposits in the impulse piping.

• Keep the liquid head balanced on both legs of the impulse piping.

ELECTRICAL CONSIDERATIONS

2-8

Before making any electrical connections to the Model 1151 analog, consider the following standards and be sure to have proper power supply, conduit, and other accessories. Make sure all electrical installation is in accordance with national and local code requirements, such as the NEC (NFPA 70).

Explosions can cause death or serious injury. Do not remove the instrument cover in explosive atmospheres when the circuit is alive.

Do not connect the power signal wiring to the test terminals. Voltage may burn out the reverse-polarity protection diode in the test connection. If the test diode is destroyed, then the transmitter can still be operated without local indication by jumping the test terminals.

High voltage (greater than 55 Volts for “E” electronics, 85 Volts for “G” electronics, 12 Volts for “L” electronics, and 14 Volts for “M” electronics.) can cause damage to the transmitter. Do not apply high voltage to the test terminals.

Installation

Wiring

FIGURE 2-4. Terminal Connections.

The signal terminals and test terminals are located in a compartment of the electronics housing separate from the transmitter electronics. The nameplate on the side of the transmitter indicates the locations of the terminal and electronics compartments. The upper pair of terminals are the signal terminals and the lower pair are the test terminals. The test terminals have the same 4–20 mA output as the signal terminals and are only for use with the optional integral meter or for testing.

To make connections, remove the cover on the side marked “Terminal” on the nameplate. All power to the transmitter is supplied over the signal wiring. Connect the lead that originates at the positive side of the power supply to the terminal marked “+” and the lead that originates at the negative side of the power supply to the terminal marked “–” as shown in Figure 2-4. No additional wiring is required.

Shielded cable should be used for best results in electrically noisy environments.

POWER

SUPPL Y

FIGURE 2-5. Wiring Con nec tions for Low Power Output Codes L and M.

Terminal

Common

Case

+ Power

Signal

Field Wiring Label Detail

The signal loop may be grounded at any point or left ungrounded.

Shield

Supply

Power

1151-1151G05A

A to D

Converter

1151-1151H05A

2-9

Model 1151 Alphaline® Pressure Transmitters

NOTE

An alternate location to connect an ammeter is on the set of terminals labelled “TEST.” Connect the positive lead of the ammeter to the positive test terminal, and the negative lead of the ammeter to the negative test terminal.

NOTE

When conduit lines are used, signal wiring need not be shielded, but twisted pairs should be used for best results. Wiring should be 12-24 AWG.

Conduit Sealing

Power Supply

FIGURE 2-6. Power Supply Load Limitations.

The 1151 has been rated as “Factory Sealed” by Factory Mutual (FM) and Canadian Standards Association (CSA). It is therefore not necessary to install conduit seals near the transmitter enclosure.

Do not run signal wiring in conduit or open trays with power wiring, or near heavy electrical equipment. Signal wiring may be grounded at any one point on the signal loop, or it may be left ung rounde d. The n egative terminal of the power supply is a recommended grounding point. The transmitter case must be grounded through the process or conduit connections.

The dc power supply should provide power with less than 2 percent ripple. The total resistance load is the sum of the resistance of the signal leads and the load resistance of the controller, indicator, and related pieces. Note that the resistance of intrinsic safety barriers, if used, must be included.

To power the loop, connect the leads at the set of terminal screws labeled “Signal.” Figure 2-6 illustrates power supply load limitations for the transmitter:

max

2-10

min

Code V

E, J 12 45 0 1650 RL = 50 (VS – 12) G 30 85 0 1100 R L512 M814

minVmaxRminRmaxRL

Low Power Minimum Load Impedance:

Operating

Region

max

at Supply Voltage (VS)

= 20 (VS – 30)

100 kV

NOTE

For CSA Approvals (codes E and J), V

= 42.4 V dc.

max

FIGURE 2-7. Conduit Installat ion Diagrams.

Installation

Possible

Conduit Line

Positions

1151-1 151D25A

Sealing

Compound

CORRECT CORRECT INCORRECT

Sealing

Compound

Possible

Conduit Line

Positions

1151-1151E25A

Conduit

Lines

Unused conduit connections on the transmitter housing should be plugged and sealed to avoid moisture accumulation in the terminal side of the housing. The recommended connections of conduit are shown in Figure 2-7.

All explosion proof, flameproof, and dust-ign ition proof installations require insertion of conduit plugs in all unused openings with a minimum of 40 ft-lbs (54 N-m) of torque. This will maintain five full threads of engagement.

1151-1151F25A

If all connections are not sealed, excess moisture accumulation can damage the transmitter. Make sure to mount the transmitter with the electrical housing positioned downward for drainage. To avoid moisture accumulation in the housing, install wiring with a drip loop, and ensure the bottom of the drip loop is mounted lower than the conduit connections or the transmitter housing.

Grounding

Use the following techniques to properly ground the transmitter signal wiring and case:

Signal Wiring Do not run signal wiring in conduit or open trays with power wiring, or

near heavy electrical equipment. Signal wiring may be grounded at any one point on the signal loop, or it may be left ung rounde d. The n egative terminal of the power supply is a recommended grounding point.

Transmitter Case The transmitter case must be grounded in accordance with national

and local electrical codes. The most effective transmitter case grounding method is a direct internal connection to earth ground with minimal impedance.

2-11

Model 1151 Alphaline® Pressure Transmitters

Internal Ground Connection: Inside the FIELD TERMINALS side of

the electronics housing is the Internal Ground Connection screw. This screw is identified by a ground symbol: .

NOTE

Grounding the transmitter case via threaded conduit connection may not provide sufficient ground continuity.

NOTE

The transient protection terminal block (See Figure 4-4 on page 4-8) does not provide transient protection unless the transmitter case is properly grounded. Use the preceding guidelines to ground the transmitter case.

Do not run the transient protection ground wire with signal wiring as the ground wire may carry excessive current if a lightning strike occurs.

Grounding Effects The capacitance sensing module requires alternating current to

generate a capacitance signal. This alternating current is developed in an oscillator circuit with a frequency of approximately 32 kHz. This signal is capacitor-coupled to transmitter-case ground through the sensing module. Because of this coupling, a voltage may be imposed across the load, depending on the choice of grounding. See Figure 2-8.

Hazardous Locations Certifications

This impressed voltage, which is seen as high frequency noise, will have no effect on most instruments. Computers with short sampling times will detect a significant noise signal, which should be filtered out by using a large capacitor (1 µF) or by using a 32 kHz LC filter across the load. Computers are negligibly affected by this noise and do not need filtering

The Model 1151 was designed with an explosion-proof housing and circuitry suitable for intrinsically safe and non-incendive operation. Factory Mutual explosion-proof certification is standard for the Model 1151 Transmitter. Individual transmitters are clearly marked with a tag indicating the approvals they carry. Transmitters must be installed in accordance with all applicable codes and standards to maintain these certified ratings. Refer to Hazardous Locations Certifications on page 6-2 for information on the approvals associated with the analog Model 1151.

2-12

FIGURE 2-8. T ypic al Ef fe ct s of Groundi ng on Accuracy for Fast Sample Computers (4-20 mA loops only).

Installation

LOAD

–

Ungrounded System

Impressed Voltage: 12 to 22 mVp-p

32 kHz

Effect: 0.01% of span.

Ground Between Negative Sid e of Power Sup ply an d Load

Impressed Voltage: 35 to 60 mVp-p

32 kHz

Effect: 0.03% of span.

–

Ground Between Positive Sid e of Transmitter and Power Supply

Impressed Voltage: 35 to 60 mVp-p

32 kHz

Effect: 0.03% of span.

LOAD

–

Ground Between Negative Terminal of Transmitter and Load

Impressed Voltage: 500 to 600 mVp-p

32 kHz

Effect: 0.27% of span.

NOTE

Typical effects caused by the impressed voltage on a computer with a sampling time of 100 microseconds using a 2 to 10 volt signal.

2-13

Model 1151 Alphaline® Pressure Transmitters

LIQUID LEVEL MEASUREMENT

Open Vessels

Closed Vessels

Differential pressure transmitters used for liquid level applications measure hydrostatic pressure head. Liquid level and specific gravity of a liquid are factors in determining pressure head. This pressure is equal to the liquid height above the tap multiplied by the specific gravity of the liquid. Pressure head is independent of volume or vessel shape.

A pressure transmitter mounted near a tank bottom measures the pressure of the liquid above.

Make a connection to the high pressure side of the transmitter, and vent the low pressure side to the atmosphere. Pressure head e quals the liquid’s specific gravity multiplied by the liquid height above the tap.

Zero range suppression is required if the transmitter lies below the zero point of the desired level range. Figure 2-9 shows a liquid level measurement example.

Pressure above a liquid affects the pressure measured at the bottom of a closed vessel. The liquid specific gravity multiplied by the liquid height plus the vessel pressure equals the pressure at the bottom of the vessel.

To measure true level, the vessel pressure must be subtracted from the vessel bottom pressure. T o do this, make a pressure tap at the top of the vessel and connect this to the low side of the transmitter. Vessel pressure is then equally applied to both the high and low sides of the transmitter . The resulting diff eren tial pressure is pro portional to liquid height multiplied by the liquid specific gravity.

Dry Leg Condition Low-side transmitter piping will remain empty if gas above the liquid

does not condense. This is a dry leg condition. Range determination calculations are the same as those described for bottom-mounted transmitters in open vessels, as shown in Figure 2-9.

FIGURE 2-9. Liquid Level Measurement Example.

Let X equal the vertical distance between the minimum and maximum measurable levels (500 in.). Let Y equal the vertical distance between the transmitter datum line and the minimum measurable level (100 in.). Let SG equal the specific gravity of the fluid (0.9). Let h equal the maximum head pressure to be measured in inches of water. Let e equal head pressure produced by Y expressed in inches of water. Let Range equal e to e + h. Then h = (X)(SG)

= 500 x 0.9 = 450 inH

e=(Y)(SG)

= 100 x 0.9 = 90 inH

Range = 90 to 540 inH

mA dc

ZERO

SUPPRESION

900

inH2O

540

2024-0171A, 0172A

2-14

Installation

Wet Leg Condition Condensation of the gas above the liquid slowly causes the low side of

the transmitter piping to fill with liquid. The pipe is purposely filled with a convenient reference fluid to eliminate this potential error. This is a wet leg condition.

The reference fluid will exert a head pressure on the low side of the transmitter . Z ero elevatio n of the range must then be made. See Figure 2-10.

FIGURE 2-10. Wet Leg Example.

H L

Let X equal the vertical distance betwe en the minimum and max im um measurable levels (500 in.). Let Y equal the vertical distance between the transmitter datum line and the minimum measurable level (50 in.). Let z equal the vertical distance between the top of the liquid in the wet leg and the transmitter datum line (600 in.). Let SG

equal the specific gravity of the fluid (1.0).

Let SG

equal the specific gravity of the fluid in the wet leg (1.1).

Let h equal the maximum head pressure to be measured in inches of water. Let e equal the head pressure produced by Y expressed in inches of water. Let s equal head pressure produced by z expressed in inches of water. Let Range equal e – s to h + e – s. Then h = (X)(SG = 500 x 1.0 = 500 in H

e=(Y)(SG = 50 x 1.0 = 50 inH

s=(z)(SG

= 600 x 1.1 = 660 inH

Range = e – s to h + e – s.

= 50 – 660 to 500 + 50 – 660 = –610 to –110 inH

)

ZERO ELEVATION

inH2O

mA dc

-110-610

2024-0167A 2024-0168A

2-15

Model 1151 Alphaline® Pressure Transmitters

Bubbler System in Open Vessel A bubbler system that has a top-mounted pressure transmitter can be

used in open vessels. This system consists of an air supply, pressure regulator, constant flow meter, pressure transmitter, and a tube that extends down into the vessel.

Bubble air through the tube at a constant flow rate. The pressure required to maintain flow equals the liquid’s specific gravity multiplied by the vertical height of the liquid above the tube opening. Figure 2-11 shows a bubbler liquid level measurement example.

FIGURE 2-11. Bubbler Liquid Level Measurement Example.

AIR

Let X equal the vertical distance betwe en the minimum and max im um measurable levels (100 in.). Let SG equal the specific gravity of the fluid (1.1). Let h equal the maximum head pressure to be measured in inches of water. Let Range equal zero to h. Then h = (X)(SG)

= 100 x 1.1 = 110 inH

Range = 0 to 110 inH

mA dc

110

inH2O

2024-0165A

2024-0166A

2-16

Section

3 Calibration

Calibration of the Rosemount Model 1151 Pressure Transmitter is simplified by its compact and explosion-proof design, external span and zero adjustments, separate compartments for electronics and wiring, and weatherproof construction. Descriptions of span, linearity, zero adjustments, and damping follow.

Explosions can cause death or serious injury. Both transmitter covers must be fully engaged to meet explosionproof requirements.

When replacing housing covers, tighten the covers enough to make contact with the O-ring seals. If the covers are not tightened enough, moisture can enter the housing and cause transmitter failure.

QUICK CALIBRATION PROCEDURE (FOR E, G, AND J ELECTRONICS)

QUICK CALIBRATION PROCEDURE (FOR L AND M ELECTRONICS)

The following Quick Calibration Procedures are for those users who are already familiar with the analog Model 1151.

NOTE

The zero and span adjustments are interactive. For applications requiring large elevated or suppressed values, refer to Elevated or Suppressed Zeros on page 3-7.

1. Apply 4 mA-point pressure and turn zero screw to output 4 mA.

2. Apply 20 mA-point pressure.

3. Subtract actual output from desired output.

4. Divide difference by 3.

5. Turn span screw above or below desired output by value in Step 4.

6. Repeat Steps 1 through 5 until calibrated.

1. Apply 1 V dc-point pressure for M electronics (0.8 V dc for L electronics) and turn zero screw to output 1 V dc (0.8 V dc for L electronics).

2. Apply 5 V dc-point pressure (M electronics) or 3.2 V dc (L electronics).

3. Subtract actual output from desired output.

4. Divide difference by 3.

5. Turn span screw above or below desired output by value in Step 4.

6. Repeat Steps 1 through 5 until calibrated.

3-1

Model 1151 Alphaline® Pressure Transmitters

Example for a Model 1151DP Range 4: For a desired calibration of 0 to 100 inH

1. Adjust the zero. With zero input applied to the transmitter, turn the zero adjustment screw until the transmitter reads 4 mA.

2. Adjust the span. Apply 100 inH connection. Turn the span adjustment screw until the transmitter output reads approximately 20 mA.

3. Release the input pressure and readjust the zero output to read 4 mA ±0.032 mA.

4. Re-apply 100 inH greater than 20 mA, divide the difference by 3, and subtract the result from 20 mA. Adjust the 100% output to this value.

If the output reading is less than 20 mA, divide the difference by 3 and add the result to 20 mA. Adjust the 100% output to this value.

Example: The full scale transmitter output is 20.100 mA. Dividing

0.100 by 3.0 gives the product 0.033. Subtracting the product 0.033 from 20.00 mA gives the difference 19.967 mA. Adjust the 100% output to this value.

5. Release input pressure and readjust the zero.

6. Apply 100% input and repeat Steps 3 through 5 if the full scale output is not 20 ±0.032 mA.

O, use the following procedure:

O to the transmitter high side

O to the transmitter. If the output reading is

NOTE

Under operating conditions that subject the transmitter to temperature extremes or significant vibration, mechanical backlash may occur in the zero and span adjustment screws. To improve the stability of zero and span settings in these circumstances, back off the adjustment screws slightly after final adjustment to break contact between the potentiometer blades and the adjustment screw slot surfaces.

3-2

Calibration

DATA FLOW WITH CALIBRATION OPTIONS

FIGURE 3-1. Model 1151 Transmitter Data Flow with Calibration Options.

Sensor

Excitation

➀ Pressure

➁

Sensor

Figure 3-1 illustrates the Model 1151 Transmitter data flow with calibration tasks.

Zero

Adjustment

➂

Signal

Conditioning

➃

Output

Span

Adjustment

Output

This data flow can be summarized in four major steps:

1. Pressure is applied to the sensor.

2. A change in pressure is measured by a change in the sensor output.

3. The sensor signal is conditioned for various parameters.

4. The conditioned signal is converted to an appropriate analog output.

3-3

Model 1151 Alphaline® Pressure Transmitters

SPAN ADJUSTMENT RANGE

ZERO ADJUSTMENT RANGE

FIGURE 3-2. Zero Adjustment Range.

The span on a Model 1151 with E, G, and J output options is continuously adjustable to allow calibration anywhere between maximum span and one-sixth of maximum span. For example, the span on a Range 4 transmitter can be adjusted between 25 and 150 inH

(6.2 and 37.2 kPa).

The zero on a Model 1151 with the E or G output options can be adjusted for up to 500% suppression or 600% elevation. See Figure 3-2.

Output (mA)

Pressure

(inH

–150 –125 –100

Output (mA)

600% Zero Elevation

–75

–50 –25 0

600% Zero Elevation*

0 25

No Zero Elevation or Suppression*

Pressure

(inH

500% Zero Elevation

*Graphs based on a range 4 (0-25 inH2O to 0-150 inH2O) 1151 with a calibrated span of 25 inH

500% Zero Suppression*

100

125

150

1151-0193A

The zero may be elevated or suppressed to these extremes with the limitation that no pressure within the calibrated range exceeds the fullrange pressure limit. For example, a Range 4 tr ansmitt er cannot be calibrated for 1 00 to 200 i nH suppression) because 200 inH

O (24.8 to 49.7 kPa) (only 100% zero

O exceeds the 150 inH2O full-range

pressure limit of a Range 4. To make large elevation or suppression adjustments, it is necessary to

move the jumper on the component side of the amplifier board. Figure 3-3 on page 3-5 shows elevation and suppression jumper settings. The jumper has three positions. The middle position allows normal levels of elevation or suppression. For larger adjustm ents, move the jumper to the ELEVATE ZERO (EZ) or SUPPRESS ZERO (SZ) as marked.

3-4

FIGURE 3-3. Elevation and Suppression Jumper Settings.

Calibration

NOTE

Always make sure that the jumper is fully seated on its pins. If the jumper has not been placed in any of the three positions, the amplifier board will provide normal levels of elevation or suppression. A slide switch replaces the jumper pin on some versions of the amplifier board.

E Output Option (4–20 mA)

Elevate Zero

Suppress Zero

G Output Option (10–50 mA)

Suppress Zero

Elevate Zero

NOTE: The jumper is located on the co mpon en t sid e of the amplifier board. Jumper positions may vary from those shown. The board must be unplugged from the transmitter to gain acce ss to the component.

1151-0194A

3-5

+ 65 hidden pages