Emerson Rosemount 2151N Reference Manual
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Emerson Rosemount 2151N Reference Manual

Emerson Rosemount 2151N Reference Manual

Analog pressure transmitter
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Reference Manual
00809-0000-4851 Rev AD
December 2023
Rosemount 2151N Analog Pressure
Transmitter
Rosemount 2151N

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Summary of Contents for Emerson Rosemount 2151N

  • Page 1 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Rosemount 2151N Analog Pressure Transmitter...
  • Page 2 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 This page intentionally left blank...
  • Page 3 The product described in this document is NOT designed for nuclear-qualified applications. Using non-nuclear qualified products in applications that require nuclear-qualified hardware or products may cause inaccurate readings. For information on Rosemount nuclear-qualified products, contact your local Emerson™ Sales Representative. WARNING Read this manual before working with the product.
  • Page 4 Rosemount Nuclear Instruments, Inc. Warranty and Limitations of Remedy The warranty and limitations of remedy applicable to this Rosemount product can be found in Emerson Terms & Conditions of Sale on the reverse side of the current Rosemount quotation and customer acknowledgment forms.
  • Page 5 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Revision Status Changes from August 2019 (Rev AC) to December 2023 (Rev AD) Page Page Changes (Old) (New) Cover, Cover, Document revision changed from August 2019 to December 2023, Rev AC to Rev...
  • Page 6 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 This page intentionally left blank Title Page...

  • Page 7: Table Of Contents

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Table of Contents SECTION 1 Using this Manual..................Introduction SECTION 2 Overview....................Installation Safety Messages..................General Considerations................Mechanical Considerations............... Process Connections and Interfaces........... Impulse Piping................Mounting Configurations.............. Conduit Connections..............Electronics Housing..............
  • Page 8 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 SECTION 4 Overview....................Operation Transmitter Theory of Operation............... The Sensor Cell..................Demodulator..................... Oscillator....................Voltage Regulator..................Current Control..................Current Limit..................... Reverse Polarity Protection..............SECTION 5 Overview....................Maintenance and Safety Messages..................Troubleshooting General Considerations................
  • Page 9 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 This page intentionally left blank Contents...

  • Page 10: Using This Manual

    December 2023 SECTION 1: Introduction USING THIS MANUAL This manual is designed to assist in installing, operating and maintaining the Rosemount 2151N Pressure Transmitter. The manual is organized into the following sections: Section 2: Installation Provides general, mechanical, and electrical installation considerations.
  • Page 11 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 This page intentionally left blank Introduction...

  • Page 12: Overview

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 SECTION 2: Installation Overview..............page 3 Safety Messages............ page 3 General Considerations......... page 4 Mechanical Considerations........page 4 Electrical Considerations........page 9 Installation Procedures.......... page 11 OVERVIEW This section contains the following installation considerations: General Considerations •...

  • Page 13: General Considerations

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 WARNING Electrical shock can result in death or serious injury. Avoid contact with the leads and terminals. • Process leaks could result in death or serious injury. Install and tighten all four flange bolts before applying •...

  • Page 14: Process Connections And Interfaces

    00809-0000-4851 Rev AD Rosemount 2151N December 2023 Mount the Rosemount 2151N transmitter to a rigid support (i.e. one with a fundamental mechanical resonant frequency of 40 Hz or greater). A stainless steel bracket is available for the coplanar flange, and a painted carbon steel bracket is available for the traditional flange.

  • Page 15: Impulse Piping

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Impulse Piping The piping between the process and the transmitter must accurately transfer the pressure to obtain accurate measurements. There are five possible sources of error: pressure transfer (such as obstruction), leaks, friction loss (particularly if purging is used), trapped gas in a liquid line or liquid in a gas line, and density variations between the legs.

  • Page 16: Mounting Configurations

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Mounting Configuration Refer to Figure 2-1 for examples of the following mounting configurations: Liquid Flow Measurement Place taps to the side of the line to prevent sediment • deposits on the process isolators.

  • Page 17: Conduit Connections

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 2-1 – Transmitter Installation Examples (liquid, gas or steam) Please note that transmitters depicted in Figure 2-1 are intended for reference only. Conduit Connections The conduit connections to the transmitter are threaded.

  • Page 18: Electrical Considerations

    CONSIDERATIONS Read this section carefully before proceeding to the electrical installation procedure. Rosemount 2151N transmitters provide a 4-20 mA signal when connected to a suitable dc power source. Figure 2-2 illustrates a typical signal loop consisting of a transmitter, power supply, and various receivers (controller, indicator, computer).

  • Page 19: Signal Integrity

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Signal Integrity Signal wiring need not be shielded, but twisted pairs yield the best results. Shielded cable should be used for best results in electrically noisy environments. Do not run signal wiring in conduit or open trays with AC power wiring, or near heavy electrical equipment.

  • Page 20: Wiring Connections

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Wiring Connections The transmitter terminal block and ground screw terminals are designed to accommodate wire sizes from 24 AWG to 14 AWG. The screw terminals are also compatible with stud size #6 (M3.5) or #8 (M4) crimp terminals.
  • Page 21 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 2-4 – Typical Mounting Configuration Stainless Steel Panel Mounting Bracket Carbon Steel Panel Mounting Bracket for Coplanar Flange for Traditional Flange Mounted Outside Bracket – Side View Mounted Inside Bracket – Side View...
  • Page 22 Rosemount 2151N December 2023 Figure 2-5 – Transmitter Dimensional Drawings Figure 2-5a – Rosemount 2151N with Coplanar Flange (Option Code E12) NOTE: All dimensions are nominal in inches [millimeters] Figure 2-5b – Rosemount 2151N with Traditional Flange (Option Code F12)

  • Page 23: Mechanical - Conduit

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Mechanical – Conduit CAUTION Connections Be careful not to damage the set screw interface between the sensor module and the electronics housing when making conduit connections. NOTE Install the conduit seal in accordance with the manufacturer’s instructions or use the following procedure: 1.
  • Page 24 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 5. Tighten until cover and housing are fully engaged metal-to-metal (see Figure 2-8). Once metal-to-metal contact has been made, it is not necessary to tighten the cover any further. 6. Visually inspect both covers to ensure they are installed metal-to-metal.
  • Page 25 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 2-7 – Internal Ground Screw Location Figure 2-8 – Electronics Housing Covers Installed Metal-to-Metal Cover / Housing Interface Figure 2-9 – Inspection of Metal-to- Metal Installation (1) If the gap exceeds acceptable limit, it will be possible to insert a 0.010 inch gap gauge at least 0.100 in (2.54 mm).
  • Page 26 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 2-10 – Acceptable vs. Unacceptable Gap Between Cover and Housing Figure 2-10a – Acceptable Gap Between Cover and Housing Figure 2-10b – Unacceptable Gap Between Cover and Housing Installation...
  • Page 27 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 This page intentionally left blank Installation...

  • Page 28: Overview

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 SECTION 3: Calibration Overview..............page 19 Safety Messages............ page 19 Calibration Overview..........page 20 Calibration Procedures.......... page 24 OVERVIEW This section contains the following transmitter calibration information: Calibration Overview • → Calibration Considerations →...

  • Page 29: Calibration Overview

    Rosemount Nuclear with questions regarding calibrations that are not explained in this manual. Rosemount 2151N transmitters are factory calibrated to the range shown on the nameplate (see Figure 1-1). This range may be changed within the limits of the transmitter. Zero may also be adjusted to elevate (for all models except absolute pressure reference) or suppress (for all models).

  • Page 30: Definitions

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 For large amounts of zero adjustment, a coarse zero select jumper is provided. The jumper is located on the electronics assembly, accessible within the electronics housing as shown in Figures 3-1 and 3-2. Models ordered with optional output damping will have a damping adjustment potentiometer located on the amplifier board (see Figure 3-2).
  • Page 31 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 % Zero Offset = (LRV/URL) X 100 Note: % Zero Offset is used when making coarse zero adjustments and replaces the traditional % Zero Elevation and % Zero Suppression terms. This concept is used due to the limited interaction between zero and span adjustments on the 2151N pressure transmitter.

  • Page 32: Span Adjustment Range

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Span Adjustment Range For transmitter ranges 2 to 6, the span is continuously adjustable to allow calibration anywhere between the transmitter URL and 1/10 of URL. For example, the span on a...

  • Page 33: Calibration Procedures

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 CALIBRATION The following calibration procedures describe the recommended steps necessary to calibrate the Rosemount PROCEDURES 2151N pressure transmitter. Span and Zero Adjustment CAUTION The 2151N pressure transmitter contains electronic circuit boards which may be static sensitive.

  • Page 34: Elevated Or Suppressed Zero Calibration Procedure

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 3-4b – Example for Zero Based Range 2 for a calibration of 0 to 24,9 kPa (24,9 kPa span) Calibration (SI Units) 1. Adjust the zero: With 0 kPa applied to the transmitter, turn the Zero adjustment until the transmitter reads 4 2.
  • Page 35 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 3-5 – Elevated Zero Calibration Example Figure 3-5a – Example for Elevated Zero Range 2 with Zero Elevation for a calibration of Calibration (English Units) –120 to –20 inH O (100 inH O span) 1.
  • Page 36 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 3-5b – Example for Elevated Zero Range 2 with Zero Elevation for a calibration of Calibration (SI Units) –29,9 to –5,0 kPa (24,9 kPa span) 1. Calibrate the transmitter to 0 to 24,9 kPa as described in the Zero Based Calibration Procedure.
  • Page 37 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 3-6 – Suppressed Zero Calibration Example Figure 3-6a – Example for Suppressed Zero Range 2 with Zero Suppression for a calibration of Calibration (English Units) 20 to 120 inH O (100 inH O span) 1.

  • Page 38: Coarse Zero Select Jumper Position Selection Procedure

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Coarse Zero Select Jumper The coarse zero select jumper (see Figure 3-2) is shipped Position Selection Procedure from the factory in either the Nominal position or the position required to obtain the calibration specified when ordered.
  • Page 39 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 3-7 contains an example of determining the typical position of the coarse zero select jumper. Figure 3-7a uses English Units (inH O) while Figure 3-7b uses SI Units (kPa). Figure 3-7 – Coarse Zero Select Jumper Adjustment Example Figure 3-7a –...

  • Page 40: Damping Adjustment

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 3-8b – Ranges 2-6 Jumper Position (Typical) % Zero Offset values and jumper positions indicated are approximations. Select jumper position as needed to achieve the desired calibration. Damping Adjustment The 2151N amplifier boards with Adjustable...

  • Page 41: High Static Line Pressure Span Effect On Rage Codes 1, 2 And 3 Dp Transmitters

    P = Static Line Pressure Span = Calibrated Span (1) For Rosemount 2151N pressure transmitters with Standard Option Code “P4”, correction for High Static Line Pressure (HSLP) at customer specified line pressure (with no residual HSLP uncertainty) may have been performed at the factory.
  • Page 42 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 NOTE For corrections where the calculated output adjustment exceeds the output high or low adjustment limits, the pressure input adjust procedure described in Method 2 (see pg. 34) is recommended. Figure 3-9 outlines examples of calculating a High Static Line Pressure Span Correction using Method 1.
  • Page 43 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 3-9b – Example for High Static Line Range 4 for a calibration of –0,07 to 0,31 MPa corrected Pressure Span Correction using Method 1 for 10,34 MPa static line pressure: (SI Units) 1.
  • Page 44 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figures 3-10 and 3-11 outline two examples of calculating a High Static Line Pressure Span Correction using Method 2. “Example 1” in Figure 3-10 contains a calculation for a Zero Based Calibration Range. Figure 3-10a uses English units...
  • Page 45 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 3-10b – Example 1 for High Static Line Range 4 for a calibration of 0 to 0,31 MPa corrected for Pressure Span Correction using Method 2 10,34 MPa static line pressure (SI Units) 1.
  • Page 46 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 3-11 – High Static Line Pressure Span Correction using Method 2; Example 2 Range 5 for a calibration of –250 to 750 psi corrected for Figure 3-11a – Example 2 for High Static Line...

  • Page 47: Transmitters (All Ranges)

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 3-11b – Example 2 for High Static Line Range 5 for a calibration of –1,72 to 5,17 MPa corrected Pressure Span Correction using Method 2 for 10,34 MPa static line pressure (SI Units) 1.

  • Page 48: Linearity

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 d. Apply the intended line pressure to high and low sides (zero differential pressure). e. Record the output reading. Subtract the reading in step e from the reading in step c. Note the sign associated with the calculated value, as the sign is maintained for the adjustment in step i.
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  • Page 50: Overview

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 SECTION 4: Operation Overview..............page 41 Transmitter Theory of Operation......page 42 The Sensor Cell............page 43 Demodulator............page 44 Oscillator..............page 44 Voltage Regulator........... page 44 Current Control............page 45 Current Limit............

  • Page 51: Transmitter Theory Of Operation

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 TRANSMITTER THEORY OF The block diagram in Figure 4-1 illustrates the operation of the 2151N pressure transmitter. OPERATION The 2151N pressure transmitter has a variable capacitance sensor (see Figure 4-2). Differential capacitance between the...

  • Page 52: Operation

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 4-1 – Block Diagram THE SENSOR CELL Process pressure is transmitted through an isolating diaphragm and silicone oil fill fluid to a sensing diaphragm in the center of the Sensor. The reference pressure is transmitted in a like manner to the other side of the sensing diaphragm.

  • Page 53: Demodulator

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 4-2 – The Sensor Cell DEMODULATOR The demodulator consists of a diode bridge that rectifies the ac signal from the sensor cell to a dc signal. The oscillator driving current, I...

  • Page 54: Current Control

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 CURRENT CONTROL The current control amplifier consists of two operational amplifiers, two transistors, and associated components. The first amplifier provides an adjustable gain output proportional to the sum of the differential sensor current and a zero adjustment current.
  • Page 55 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 This page intentionally left blank Operation...

  • Page 56: Overview

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 SECTION 5: Maintenance & Troubleshooting Overview..............page 47 Safety Messages............ page 47 General Considerations......... page 48 Test Terminal............page 50 Electronics Assembly Checkout......page 50 Sensor Module Checkout........page 51 Disassembly Procedure.........

  • Page 57: General Considerations

    Maintenance of traceability of any replacement parts is the responsibility of the user. GENERAL The Rosemount 2151N transmitter has no moving parts and require a minimum of scheduled maintenance. Calibration CONSIDERATIONS procedures for range adjustments are outlined in Section 3: Calibration.
  • Page 58 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 5-1 – Parts Drawing, Exploded View (Rosemount 2151N with Coplanar Flange Shown) Table 5-1 – 2151N Parts List ITEM NO. DESCRIPTION ITEM NO. DESCRIPTION Electronics Cover Sensor Module Cover O-ring...

  • Page 59: Test Terminal

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 TEST TERMINAL A test terminal is provided to allow connection of a current meter without impacting the powered signal loop. As shown in Figure 5-2, the current meter is connected from the positive signal terminal to the loop test terminal.

  • Page 60: Sensor Module Checkout

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 SENSOR MODULE NOTE CHECKOUT Numbers in parentheses refer to item numbers in Figure 5-1. The sensor module (8) is not field-repairable and must be replaced if defective. If no visible defect such as a punctured...

  • Page 61: Disassembly Procedure

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 NOTE The Sensor Module Checkout procedure does not completely test the sensor module. If electronics assembly replacement does not correct the abnormal condition and no other problems are obvious, replace the sensor module.
  • Page 62 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Process Flange Removal 1. Remove the transmitter from service before disassembling flanges. 2. Remove the two flange cap screws (13). 3. Detach process flange (10) by removing the four large bolts (11). TAKE CARE NOT TO SCRATCH OR PUNCTURE THE ISOLATING DIAPHRAGMS.
  • Page 63 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 5-4 – Location of Zero and Span Adjustment Screws and Electronics Assembly Captive Screws Figure 5-5 – Removing Electronics Assembly Figure 5-6 – Removing Terminal Block Assembly Maintenance & Troubleshooting...

  • Page 64: Reassembly Procedure

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 REASSEMBLY PROCEDURE NOTE Numbers in parentheses refer to item numbers in Figure 5-1. NOTE 2151N transmitters contain electronic circuit boards which may be static sensitive. Therefore, observe proper ESD precautions/techniques whenever the electronics assemblies are handled and/or exposed.
  • Page 65 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 2. Verify connector plug o-ring is in place as shown in Figure 5-8. If connector plug o-ring is missing, please contact Rosemount Nuclear for assistance. 3. Apply a small amount of your plant-approved lubricant to exposed surface of the connector plug o-ring.
  • Page 66 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 5-10 – Installation of Electronics Assembly Connector Plug 5. Push the electronics assembly (4) into the electronics housing (5) and fasten with the two 6-32 captive screws. Torque each captive screw to 7in-lb ±1 in-lb (0.8 N-m ±0.1 N-m), or hand-tight (see Figure 5-11).
  • Page 67 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Electronics Housing Cover 1. Inspect the housing (5) and cover (1) threads for Installation cleanliness. If chips or dirt are present, clean the o- ring seat and mating threads on the housing and cover with a soft brush.
  • Page 68 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Process Flange Reassembly 1. Replace the process O-rings (C-ring for AP transmitters) (9) with new O-rings (C-ring) if the flange (10) was removed. Carefully place one O-ring (C-ring) in each of the two weld rings located on the isolating diaphragms of the sensor module (8) as shown in Figure 5-12.

  • Page 69: Post Assembly Tests

    Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Figure 5-13 – Flange Bolt Torqueing Sequence POST ASSEMBLY TESTS 1. Conduct hydrostatic testing to 150% of maximum working pressure or 2,000 psi (13.79 MPa), whichever is greater. Conduct the testing for a duration of ten...
  • Page 70 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Table 5-2 – Torque References ITEM(S) TO BE TORQUED TORQUE VALUE TOLERANCE Traditional Flange Bracket to Mounting Surface 19 ft-lb (26 N-m) ±1 ft-lb (1.4 N-m) Bolts Coplanar Flange Bracket to Mounting Surface 19 ft-lb (26 N-m) ±1 ft-lb (1.4 N-m)
  • Page 71 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 Table 5-3 – Troubleshooting POTENTIAL SYMPTOM CORRECTIVE ACTION SOURCE Check for restrictions at primary element, improper installation or Primary Element poor condition. Note any changes in process fluid properties that may affect output.
  • Page 72 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 POTENTIAL SYMPTOM CORRECTIVE ACTION SOURCE Test Diode Replace terminal block. Failures Transmitter Determine faulty circuit board by trying spare electronics Electronics Failure assembly or terminal block assembly. Replace faulty assembly. Low Output NOTE: See Sensor Module Checkout section.
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  • Page 74 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 This page intentionally left blank Maintenance & Troubleshooting...
  • Page 75 Reference Manual 00809-0000-4851 Rev AD Rosemount 2151N December 2023 This page intentionally left blank Maintenance & Troubleshooting...
  • Page 76 Swagelok is a registered trademark of Swagelok Co. All other marks are the property of their respective owners The Emerson logo is a trademark and service mark of Emerson Electric Co. Rosemount Nuclear satisfies all obligations Rosemount and Rosemount logotype are trademarks of coming from legislation to harmonize product Rosemount Inc.

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