Emerson Rosemount 3051N Reference Manual
Reference Manual
00809-0100-4808, Rev EA
March 2021
Rosemount™ 3051N Smart Pressure Transmitter
for Nuclear Service
This page intentionally left blank
Reference Manual
00809-0100-4808, Rev EA
1Section 1: Introduction
2Section 2: Transmitter Functions
Contents
March 2021
1.1 Using this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2 Safety messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.3 Failure mode alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3.1 Alarm level verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.4 Transmitter security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.4.1 Security jumper (write protect) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.4.2 Local zero and span (local keys) software lock out. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.4.3 Physical removal of local zero and span (local keys) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.5 Configuring transmitter alarm and security jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.6 Commissioning transmitter with a HART-based communicator . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.6.1 Setting the loop to manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.6.2 Wiring diagrams (bench hook-up) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.6.3 Wiring diagrams (field hook-up) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.7 Review configuration data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.8 Check output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.8.1 Process variables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.8.2 Sensor temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.9 Basic setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.9.1 Set process variable units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.9.2 Set output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.9.3 Rerange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.9.4 Rerange with a communicator only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.9.5 Rerange with a pressure input source and a communicator . . . . . . . . . . . . . . . . . . . . . . 11
2.9.6 Rerange with a pressure input source and the local zero and span buttons . . . . . . . . . 11
2.9.7 Damping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.9.8 LCD display meter options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.10 Detailed setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.10.1 Local span and zero control (local keys) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.10.2 Sensor temperature output unit selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.11Diagnostics and service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.11.1 Transmitter test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.11.2 Loop test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Contents
2.12 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.12.1 Calibration overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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2.12.2 Deciding which trim procedure to use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.12.3 Sensor trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.12.4 Zero trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.12.5 Full trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.12.6 Recall factory trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.12.7 Recall factory trim– sensor trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.12.8 Recall factory trim– analog output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.12.9 Analog output trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.12.10 Digital-to-analog trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.12.11 Digital-to-analog trim using other scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.12.12 Compensating Rosemount 3051N Range 4 and 5 Differential Transmitters for
line pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3Section 3: Installation
3.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.2 Safety messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.3 General considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.3.1 Special draft range considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.4 Mechanical considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.4.1 Rosemount 3051ND0 and 3051ND1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.4.2 Steam service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.4.3 Side mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.4.4 Independent seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.4.5 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.4.6 Process connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.4.7 Housing rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.5 Electrical considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.5.1 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.5.2 Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.5.3 Grounding the transmitter case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3.6 Environmental considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3.6.1 Access requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3.6.2 Cover installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4Section 4: Troubleshooting
4.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4.2 Safety messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4.2.1 Returning Rosemount products and materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
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AAppendix A: Specifications and Reference Data
Contents
March 2021
A.1 Nuclear specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
A.1.1 Seismic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
A.1.2 Environmental. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
A.1.3 Quality Assurance program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
A.1.4 Nuclear cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
A.1.5 Hydrostatic testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
A.2 Performance specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
A.2.1 Reference accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
A.2.2 Drift. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
A.2.3 Ambient temperature effect
A.2.4 Overpressure effect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
A.2.5 Static pressure effect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
A.2.6 Power supply effect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
A.2.7 Load effect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
A.2.8 Mounting position effect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
(1)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
A.3 Functional specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
A.3.1 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
A.3.2 Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
A.3.3 Power supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
A.3.4 Temperature limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
A.3.5 Span and zero, zero elevation, and suppression. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
A.3.6 Humidity limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
A.3.7 Volumetric displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
A.3.8 Turn-on time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
A.3.9 Response time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
A.3.10 Maximum working pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
A.3.11 Static pressure limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
A.3.12 Overpressure limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
A.3.13 Burst pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
A.4 Physical specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
A.4.1 Materials of construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
A.5 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
A.6 Configuration information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
A.6.1 Rosemount 3051N 4-20 mA/HART Output Smart Pressure Transmitters
Typical Configuration Data Worksheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
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BAppendix B: Options
B.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
B.2 Safety messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
B.3 LCD display meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
B.3.1 Custom meter configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
B.3.2 Installing the meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
B.3.3 Diagnostic messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
B.3.4 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
B.3.5 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
B.4 Mounting brackets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
B.4.1 Traditional flange (H2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
B.5 Transient protection terminal block (T1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
CAppendix C: HART® Communicator
C.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
C.2 Safety messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
C.3 Connections and hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
C.4 Menus and functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
C.4.1 Main menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
C.4.2 Online menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
C.4.3 Fast Key sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
C.4.4 Hot Key options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
C.5 Diagnostic messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
DAppendix D: Glossary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
vi
Contents
Reference Manual
00809-0100-4808, Rev EA
Rosemount™ 3051N Smart Pressure Transmitter for nuclear service
Rosemount 3051 HART® Universal Revision 5
Read this manual before working with the product. For personal and system safety, and for optimum
product performance, make sure you thoroughly understand the contents before installing, using, or
maintaining this product.
Within the United States, contact Rosemount Nuclear Instruments, Inc. at
1-952-949-5200 for assistance.
Outside of the United States, contact your local Emerson Process Management Sales Representative.
Rosemount Nuclear Instruments, Inc. warranty and limitations of remedy
The warranty and limitations of remedy applicable to this Rosemount equipment are as stated on the
reverse of the current Rosemount quotation and customer acknowledgment forms.
Return of material
Authorization for return is required from Rosemount Nuclear Instruments, Inc. prior to shipment.
Contact Rosemount Nuclear Instruments, Inc. (1-952-949-5200) for details on obtaining Return Material
Authorization (RMA). Rosemount Nuclear Instruments will not accept any returned material without a
Returned Material Authorization. Material returned without authorization is subject to return to
customer.
Title Page
March 2021
Material returned for repair, whether in or out of warranty, should be shipped prepaid to:
Rosemount Nuclear Instruments, Inc.
8200 Market Blvd.
Chanhassen, MN 55317
USA
Important
The Rosemount 3051N Pressure Transmitter is qualified for nuclear use per IEEE Std 344-1987 and IEEE
Std 323-1983 (mild environment) as documented in Rosemount Report D2001019, and is supplied in
accordance with 10CFR50 Appendix B and ISO 9001:2008 quality assurance programs. To ensure
compliance with 10CFR Part 21, the transmitter must comply with the requirements herein and in
Report D2001019 throughout its installation, operation, and maintenance. It is incumbent upon the user
to ensure that the Rosemount Nuclear Instruments, Inc. component traceability program where
applicable is continued throughout the life of the transmitter.
Where the manual uses the terms requirements, mandatory, must, or required, the instructions so
referenced must be carefully followed. Rosemount Nuclear Instruments, Inc. expressly disclaims all
responsibility and liability for transmitters for which the foregoing has not been complied with by the
user.
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Section 1 Introduction
1.1 Using this manual
The sections in this manual provide information on installing, operating, and maintaining devices from
the Rosemount
Section 2: Transmitter Functions provides instruction on commissioning and operating Rosemount
3051N Pressure Transmitters. Information on software functions, configuration parameters, and online
variables is also included.
Section 3: Installation provides mechanical and electrical installation instructions.
Section 4: Troubleshooting provides troubleshooting techniques for the most common Rosemount
3051N Transmitter operating problems.
Appendix A: Specifications and Reference Data provides reference and specification data for the
Rosemount 3051N Smart Pressure Transmitter Family.
Appendix B: Options describes the mounting and configuration options available for Rosemount 3051N
Transmitters.
™
3051N Smart Pressure Transmitter Family. The sections are organized as follows:
Introduction
March 2021
Appendix C: HART® Communicator provides an overview of the HART Communicator, defines its partial
command menu tree for the Rosemount 3051N Family, and provides a table of typical Fast Key
sequences. A table of typical diagnostic messages is also included.
Introduction
1
Introduction
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Introduction
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Section 2 Transmitter Functions
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3
Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3
Failure mode alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4
Transmitter security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4
Configuring transmitter alarm and security jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5
Commissioning transmitter with a HART-based communicator . . . . . . . . . . . . . . . . . . . . . . . . page 6
Review configuration data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 8
Check output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 9
Basic setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 9
Detailed setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 13
Diagnostics and service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 13
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 15
Transmitter Functions
March 2021
2.1 Overview
This section contains information on commissioning and operating Rosemount™ 3051N Smart Pressure
Transmitters. Tasks that should be performed on the bench prior to installation are explained in this
section.
When the HART
documented in Rosemount Report D2001019.
For your convenience, typical HART Communicator Fast Key sequences are listed for most software
functions. These Fast Key sequences are the same for the 275, 375, and 475 Field Communicators. If you
are unfamiliar with the communicator or how to follow Fast Key sequences, refer to Appendix C: HART®
Communicator for communicator operations.
A typical transmitter software configuration data worksheet is provided in Appendix A: Specifications
and Reference Data.
®
Communicator is referenced, it refers to the 275, 375, or 475 Field Communicator as
2.2 Safety messages
Procedures and instructions in this section may require special precautions to ensure the safety of the
personnel performing the operations. Information that raises potential safety issues is indicated by a
warning symbol ( ). Refer to the following safety messages before performing an operation preceded
by this symbol.
Transmitter Functions
Explosions can result in death or serious injury.
Do not remove the transmitter covers in explosive environments when the circuit is alive.
Electrical shock can result in death or serious injury.
Avoid contact with the leads and terminals. High voltage that may be present on leads can cause
electrical shock.
3
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2.3 Failure mode alarm
Rosemount 3051N Transmitters automatically and continuously perform self-diagnostic routines. If the
self-diagnostic routines detect a failure, the transmitter drives its output outside of the normal
saturation values. The transmitter will drive its output low or high based on the position of the failure
mode alarm jumper. See Table 2-1 for failure mode and saturation output levels. To select alarm
position, see “Configuring transmitter alarm and security jumper” on page 5.
Table 2-1. Standard Alarm and Saturation Values
Level 4—20 mA Saturation 4—20 mA Alarm
Low 3.9 mA ≤ 3.75 mA
High 20.8 mA ≥ 21.75 mA
Note
The actual transmitter mA output values can be altered by performing an analog output trim.
Note
When a transmitter is in an alarm condition, the hand-held HART Communicator indicates the analog
output the transmitter would drive if the alarm condition did not exist. The transmitter will alarm high in
the event of failure if the alarm jumper is removed.
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2.3.1 Alarm level verification
Transmitters allow verification testing of alarm current levels. If you replace the LCD display meter,
reconfigure or make any changes to the transmitter, verify the transmitter alarm level before you return
the transmitter to service. This feature is also useful in testing the reaction of your control system to a
transmitter in an alarm state. To verify the transmitter alarm values, perform a loop test and set the
transmitter output to the alarm value (see Table 2-1 and “Loop test” on page 14).
2.4 Transmitter security
There are three security methods with the Rosemount 3051N Transmitter.
1. Security Jumper: prevents all writes to transmitter configuration.
2. Local Keys (Local Zero and Span) Software Lock Out: prevents changes to transmitter range points via
local zero and span adjustment keys. With local keys security enabled, changes to configuration are
possible via HART.
3. Physical Removal of Local Keys (Local Zero and Span) Magnetic Buttons: removes ability to use local
keys to make transmitter range point adjustments. With local keys security enabled, changes to
configuration are possible via HART.
Note
If the security jumper is not installed, the transmitter will continue to operate in the security OFF
configuration.
4
Transmitter Functions
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B
00809-0100-4808, Rev EA
Transmitter Functions
2.4.1 Security jumper (write protect)
You can prevent changes to the transmitter configuration data with the write protection jumper.
Security is controlled by the security (write protect) jumper located on the electronics board or meter
face. Position the jumper on the transmitter circuit board in the ON position to prevent accidental or
deliberate change of configuration data.
If the transmitter write protection jumper is in the ON position, the transmitter will not accept any
“writes” to its memory. Configuration changes, such as digital trim and reranging, cannot take place
when the transmitter security is on.
2.4.2 Local zero and span (local keys) software lock out
To enable this feature, see “Local span and zero control (local keys)” on page 13.
2.4.3 Physical removal of local zero and span (local keys)
To remove the magnetic buttons used to activate the local zero and span, use a small slotted head
screwdriver and pry off the small, plastic cap located under the approval tag. Remove button assemblies
and discard.
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2.5 Configuring transmitter alarm and security jumper
To reposition the jumpers, follow the procedure described below.
1. If the transmitter is installed, secure the loop and remove power.
2. Remove the housing cover opposite the field terminal side. Do not remove the transmitter covers in
explosive atmospheres when the circuit is alive.
3. Reposition the jumpers as desired.
Figure 2-1 shows the jumper positions for electronics boards.
Figure 2-2 shows transmitters with an optional LCD display meter.
4. Reattach the transmitter cover. Transmitter covers must be fully engaged to meet explosionproof
requirements.
Figure 2-1. Electronics Board
Transmitter Functions
A. Security
B. Alarm
5
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March 2021
Figure 2-2. Rosemount 3051N Transmitter with Optional LCD Display Meter
Note
Security jumper not installed = not write protected
Alarm jumper not installed = high alarm
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2.6 Commissioning transmitter with a HART-based communicator
Commissioning consists of testing the transmitter and verifying transmitter configuration data. You may
commission Rosemount 3051N Transmitters either before or after installation. Commissioning the
transmitter on the bench before installation using a HART-based Communicator ensures that all
transmitter components are in good working order and acquaints you with the operation of the device.
To commission on the bench, connect the transmitter and the communicator as shown in Figure 2-3.
Make sure the instruments in the loop are installed in accordance with intrinsically safe or nonincendive
field wiring practices before connecting a communicator in an explosive atmosphere. Connect the
communicator leads at any termination point in the signal loop. It is most convenient to connect them to
the terminals labeled “COMM” on the terminal block. Connecting across the “TEST” terminals will
prevent successful communication. To avoid exposing the transmitter electronics to the plant
environment after installation, set all transmitter jumpers during the commissioning stage on
the bench.
For 4—20 mA transmitters, you will need a power supply capable of providing 10.5 to 55 V dc at the
transmitter, and a meter to measure output current. To enable communication, a resistance of at least
250 ohms, but within the transmitter load limitations (see Figure 3-7 on page 35) must be present
between the communicator loop connection and the power supply. Do not use inductive-based
transient protectors with the Rosemount 3051N Transmitter.
2.6.1 Setting the loop to manual
Whenever you are preparing to send or request data that would disrupt the loop or change the output of
the transmitter, you must set your process application loop to manual. The HART Communicator will
prompt you to set the loop to manual when necessary. Keep in mind that acknowledging this prompt
does not set the loop to manual. The prompt is only a reminder; you have to set the loop to manual
yourself as a separate operation.
6
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B
C
A
B
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00809-0100-4808, Rev EA
2.6.2 Wiring diagrams (bench hook-up)
Connect the bench equipment as shown in Figure 2-3 and turn on the HART-based Communicator by
pressing the ON/OFF key. The communicator will search for a HART-compatible device and will indicate
when the connection is made. If the communicator fails to connect, it will indicate that no device was
found. If this occurs, refer to Section 4: Troubleshooting.
Figure 2-3. Bench Hook-up (4—20 mA Transmitters)
Transmitter Functions
March 2021
A. Current meter
≥ 250 ohms (necessary for HART communication only)
B. R
L
C. 24 Vdc power supply
See “Safety messages” on page 3 for warning information.
2.6.3 Wiring diagrams (field hook-up)
The following diagrams illustrate wiring loops for a field hook-up with a HART-based Communicator.
Figure 2-4. Field Hook-up (4—20 mA Transmitters)
Transmitter Functions
A. Current meter
B. R
≥ 250 ohms (necessary for HART communication only)
L
C. Power supply
7
Transmitter Functions
March 2021
Do not use inductive-based transient protectors.
Note
Signal point may be grounded at any point or left ungrounded
2.7 Review configuration data
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HART Fast Keys
1, 5
Note
Information and procedures in this section that make use of HART Communicator Fast Key sequences
assume that the transmitter and communicator are connected, powered, and operating correctly. Refer
to Appendix C: HART® Communicator for more details on the HART Communicator or Fast Key
sequences.
Before placing the transmitter into operation, it is recommended to review the transmitter configuration
data that was set at the factory. Review the following configuration data:
Transmitter Model Type
Tag Range
Date Descriptor
Message Minimum and Maximum Sensor Limits
Minimum Span Units
4 and 20 mA points Output (linear or sq. root)
Damping Alarm Setting (high, low)
Security Setting (on, off) Local Zero/Span Keys (enabled, disabled)
Integral Meter Sensor Fill
Isolator Material Flange (type, material)
O-Ring Material Drain/Vent
Remote Seal (type, fill fluid, isolator material, number) Transmitter S/N
Address Sensor S/N
8
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2.8 Check output
Before performing other transmitter online operations, review the digital output parameters to ensure
that the transmitter is operating properly and is configured to the appropriate process variables.
2.8.1 Process variables
Transmitter Functions
March 2021
HART Fast Keys
2
The process variables for the Rosemount 3051N Transmitter provide the transmitter output, and are
continuously updated. The process variable menu displays the following process variables:
Pressure
Percent of Range
Analog Output
The pressure reading in both Engineering Units and Percent of Range will continue to track with
pressures outside of the defined range from the lower to the upper range limit of the sensor module.
Note
Regardless of the range points, the Rosemount 3051N Transmitter will measure and report all readings
within the digital limits of the sensor. For example, if the 4 and 20 mA points are set to 0 and 10 in H
on a range code 1 Rosemount 3051N Transmitter, and the transmitter detects a pressure of 25 inH
digitally outputs the 25 inH
O reading and a 250% of span reading. However, there may be up to ±5.0%
2
error associated with output outside of the range points.
2.8.2 Sensor temperature
HART Fast Keys
The Rosemount 3051N Transmitter contains a temperature sensor just above its pressure sensor in the
sensor module. When reading this temperature, keep in mind that this is not a process temperature
reading.
1, 1, 4
2
O, it
2
O
2.9 Basic setup
2.9.1 Set process variable units
Transmitter Functions
HART Fast Keys
The PV Unit command sets the process variable units to allow you to monitor your process using the
appropriate units of measure. Select from the following engineering units:
inH
inHg psi mbar kPa
ftH
mmH
O mmHg bar Pa
2
O torr g/cm
2
O inH2O at 4 °C kg/cm
2
1, 3, 2
2
2
atm
mmH2O at 4 °C
9
Transmitter Functions
Sq. Root
Curve
Transition Point
Linear Section
Slope=1
Slope=42
Transition Point
Sq. Root Curve
Full Scale Flow
(%)
Full Scale Output
(mA dc)
March 2021
2.9.2 Set output
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HART Fast Keys
1, 3, 5
Activate the transmitter square root output option to make the analog output proportional to flow. As
the input approaches zero, the Rosemount 3051N Transmitter automatically switches to a linear output
in order to ensure a more smooth, stable output near zero. See Figure 2-5.
The transition from linear to square root is not adjustable. It occurs at 0.8 percent of ranged pressure
input or 8.9 percent of full-scale flow output.
From 0 percent to 0.6 percent of the ranged pressure input, the slope of the curve is unity
(y = x). This allows accurate calibration near zero. Greater slopes would cause large changes in output for
small changes at input. From 0.6 percent to 0.8 percent, the slope of the curve equals 42 (y = 42x) to
achieve continuous transition from linear to square root at the transition point.
Figure 2-5. Square Root Output Transition Point
2.9.3 Rerange
10
The Range Values command sets the 4 and 20 mA points (lower and upper range values). Setting the
range values to the limits of expected readings maximizes transmitter performance. In practice, you may
reset the transmitter range values as often as necessary to reflect changing process conditions.
There are three methods available to rerange the transmitter. Each method is unique; examine all three
closely before deciding which method to use.
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2.9.4 Rerange with a communicator only
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March 2021
HART Fast Keys
Reranging using only the communicator changes the values of the analog 4 and 20 mA points
independently without a pressure input.
Note
Changing the lower or upper range point results in similar changes to the span.
To rerange using only the communicator, enter the Fast Key sequence above, select 1 Keypad input, and
follow the online instructions. Or enter the values directly from the ONLINE screen.
Note
If the transmitter security jumper is in the ON position, you will not be able to make adjustments to the
zero and span. Refer to Figure 2-1 on page 5 for the appropriate placement of the transmitter security
jumper.
1, 2, 3, 1, 1
2.9.5 Rerange with a pressure input source and a communicator
HART Fast Keys
Reranging using the communicator and a pressure source or process pressure is a way of reranging the
transmitter with a pressure input. When specific 4 and 20 mA points are not known process input can be
used. This method changes the values of the analog 4 and 20 mA points.
1, 2, 3, 1, 2
Note
When setting the 4 mA point, the span is maintained; when setting the 20 mA point, the span changes. If
setting the lower range point to a value that causes the upper range point to exceed the sensor limit, the
upper range point is automatically set to the sensor limit, and the span is adjusted accordingly.
To rerange using the communicator and a pressure source or process pressure, enter the Fast Key
sequence above, select 2 Apply values, and follow the online instructions.
Note
If the transmitter security jumper is in the ON position, no adjustments can be made to the zero and
span. Refer to Figure 2-1 on page 5 for the appropriate placement of the transmitter security jumper.
2.9.6 Rerange with a pressure input source and the local zero and span buttons
Reranging using the local zero and span adjustments (see Figure 2-6 on page 12) and a pressure source
or process pressure is a way of reranging the transmitter with a pressure input and when a
communicator is not available. When specific 4 and 20 mA points are not known process input can be
used.
Note
When setting the 4 mA point, the span is maintained; when setting the 20 mA point, the span changes. If
setting the lower range point to a value that causes the upper range point to exceed the sensor limit, the
upper range point is automatically set to the sensor limit and the span is adjusted accordingly.
Transmitter Functions
11
Transmitter Functions
March 2021
To rerange the transmitter using the span and zero buttons, perform the following procedure.
1. Loosen the screw holding the label on top of the transmitter housing, and rotate the label to expose
the zero and span buttons (see Figure 2-6 on page 12).
2. Using a pressure source with an accuracy three to ten times the desired calibrated accuracy, apply a
pressure equivalent to the lower range value to the high side of the transmitter.
3. To set the 4 mA point, press and hold the zero button for at least two seconds, then verify the output
is 4 mA. If a meter is installed, it will display ZERO PASS.
4. Apply a pressure equivalent to the upper range value to the high side of the transmitter.
5. To set the 20 mA point, press and hold the span button for at least two seconds, then verify the
output is 20 mA. If a meter is installed, it will display SPAN PASS.
Note
If the transmitter security jumper is in the ON position, or if the local zero and span adjustments are
disabled through the software, adjustments to the zero and span cannot be made using the local
buttons. Refer to Figure 2-1 on page 5 for the proper placement of the transmitter security jumper. Or
refer to “Local span and zero control (local keys)” on page 13 in Section 2 for instructions on how to
enable the span and zero buttons.
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Figure 2-6. Local Zero and Span Adjustments
A. Span and Zero Adjustment buttons
After reranging the transmitter using the span and zero adjustments, it is possible to disable the
adjustments to prevent further reranging. Refer to “Local span and zero control (local keys)” below for
more information.
2.9.7 Damping
HART Fast Keys
A
1, 3, 6
The process variable (PV) Damp command changes the response time of the transmitter to smooth
variations in output readings caused by rapid changes in input. Determine the appropriate damping
setting based on the necessary response time, signal stability, and other requirements of the of loop
dynamics of your system. The default damping value is 0.4 seconds,
(1)
and can be reset to any of eleven
pre-configured, nominal damping values between 0 and 25.6 seconds.
1. Rosemount 3051ND0 default damping is 3.2 seconds. Rosemount 3051ND1, with calibrations below 2.5 inH2O (0,62 kPa), have damping set at 3.2 sec-
onds.
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2.9.8 LCD display meter options
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March 2021
HART Fast Keys
The Meter Options command allows you to customize the LCD display meter for use in your application.
The meter can be configured to display the following information:
Engineering units
Percent of range
User-configurable LCD display scale
Alternating between any two of the above
The user-configurable scale is a feature that enables you to configure the LCD display meter to a custom
scale using a HART Communicator. This feature can be used to define the decimal point position, the
upper range value, the lower range value, the engineering units, and transfer function. Refer to “Custom
meter configuration” on page 52 for complete configuration information.
1, 4, 3, 4
2.10 Detailed setup
2.10.1 Local span and zero control (local keys)
HART Fast Keys
The Local keys command allows software control over the use of the local span and zero adjustments. To
enable or disable the span and zero adjustment buttons on the transmitter, perform the Fast Key
sequence above.
1, 4, 4, 1, 7
Note
Disabling the local keys does not disable all transmitter configuration changes. With the local keys
disabled, changes to the transmitter configuration can still be made–including range values–using a
HART Communicator.
2.10.2 Sensor temperature output unit selection
HART Fast Keys
The Sensor Temperature Output Unit Selection command selects between Celsius and Fahrenheit units for
output of the sensor temperature. The sensor temperature output is accessible via HART only.
1, 4, 1, 2, 2
2.11 Diagnostics and service
The diagnostics and service functions listed here are primarily for use after installing the transmitter in
the field. The transmitter test feature is designed to verify the transmitter is operating properly, and can
be performed either on the bench or in the field. The loop test feature is designed to verify proper loop
wiring and transmitter output, and should only be performed after installing the transmitter.
Transmitter Functions
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2.11.1 Transmitter test
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HART Fast Keys
The transmitter Self Test command initiates a more extensive diagnostics routine than that performed
continuously by the transmitter. The transmitter test routine can quickly identify potential electronics
problems. If the transmitter test detects a problem, messages to indicate the source of the problem are
displayed on the communicator screen.
2.11.2 Loop test
HART Fast Keys
The Loop Test command verifies the output of the transmitter, the integrity of the loop, and the
operations of any recorders or similar devices installed in the loop. To initiate a loop test, perform the
following procedure.
1. Connect a reference meter to the transmitter. To do so, either connect the meter to the test terminals
on the transmitter terminal block, or shunt the power to the transmitter through the meter at some
point in the loop.
2. From the ONLINE screen, select 1 Device Setup > 2 Diagnostics and Service > 2 Loop Test, to
prepare to perform a loop test.
3. Set the control loop to manual (see “Setting the loop to manual” on page 6). The communicator
displays the loop test menu.
4. Select OK.
1, 2, 1, 1
1, 2, 2
5. Select a discreet milliamp level for the transmitter to output. At the CHOOSE ANALOG OUTPUT prompt,
select 1 4mA > 2 20mA, or select 3 other to manually input a value.
Note
If performing a loop test to verify the transmitter output, enter a value between 4 and 20 mA. If
performing a loop test to verify the transmitter alarm levels, enter the milliamp value representing an
alarm state (Table 2-1 on page 4).
6. Check the electrical current meter installed in the test loop to verify it reads the value commanded
the transmitter to output.
Note
If the readings match, then the transmitter and loop are configured and functioning properly. If the
readings do not match, then the current meter may be attached to the wrong loop, there may be a fault
in the wiring or elsewhere in the loop, the transmitter may require an output trim, or the electrical
current meter may be malfunctioning.
After completing the test procedure, the display returns to the loop test screen and allows selection of
another output value or exit loop testing.
Note
If the HART Communicator is disconnected from the process loop or loses power prior to exiting loop
testing, output will remain fixed at the loop test value.
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2.12 Calibration
Calibrating a smart transmitter is different from calibrating an analog transmitter. The one-step
calibration process of an analog transmitter is done in three steps with a smart transmitter.
Rerange–sets the 4 and 20 mA points at the desired pressures;
Sensor Trim–Adjusts the position of the factory characterization curve to optimize the transmitter
performance over a specified pressure range or to adjust for mounting effects;
Analog Output Trim–Adjusts the analog output to match the plant standard or the control loop.
Smart transmitters operate differently than analog transmitters. A smart transmitter uses a
microprocessor and sensor memory that contains information about the sensor’s specific characteristics
in response to pressure and temperature inputs. A smart transmitter compensates for these sensor
variations. The process of generating the sensor performance profile is called factory characterization.
Factory characterization also provides the ability to readjust the 4 and 20 mA points without applying
pressure to the transmitter.
The trim and rerange functions also differ. Reranging sets the transmitter analog output to the selected
upper and lower range points and can be done with or without an applied pressure. Reranging does not
change the factory characterization curve stored in the microprocessor. Sensor trimming requires an
accurate pressure input and adds additional compensation that adjusts the position of the factory characterization curve to optimize transmitter performance over a specific pressure range.
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March 2021
Note
Sensor trimming adjusts the position of the factory characterization curve. It is possible to degrade the
performance of the transmitter if the sensor trim is done improperly or with inaccurate equipment.
Contact Rosemount Nuclear Instruments, Inc. at 952-949-5200 if there are questions.
Table 2-2. Standard Alarm and Saturation Values
Transmitter Bench calibration tasks Field calibration tasks
1. Reconfigure parameters if
necessary.
2. Zero trim the transmitter to
compensate for mounting effects or
static pressure effects.
1. Reconfigure parameters if
necessary.
2. Perform low trim value section of
the full sensor trim procedure to
correct for mounting position
effects.
Rosemount
3051ND
Rosemount
3051NG
Rosemount
3051NA
1. Set output configuration parameters.
a. Set the process variable units.
b. Set the output type.
c. Set the range points.
d. Set the damping value.
2. Optional: Perform a full sensor trim (accurate multimeter required).
3. Optional: Perform an analog output trim (accurate multimeter required).
1. Set output configuration parameters:
a. Set the process variable units.
b. Set the output type.
c. Set the range points.
d. Set the damping value.
2. Optional: Perform a full sensor trim if equipment available (accurate
absolute pressure source required), otherwise perform the low trim value
section of the full sensor trim procedure.
3. Optional: Perform an analog output trim (accurate multimeter required).
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March 2021
Note
A HART Communicator is required for all sensor and output trim procedures.
Rosemount 3051N Transmitter Range 4 and Range 5 Transmitters require a special calibration procedure
when used in differential pressure applications under high static line pressure (see “Compensating
Rosemount 3051N Range 4 and 5 Differential Transmitters for line pressure” on page 22).
2.12.1 Calibration overview
Complete calibration of the Rosemount 3051N Pressure Transmitter involves the following tasks.
Configure the analog output parameters
Set Process Variable Units (page 9)
Set Output Type — Linear or Square Root (page 10)
Set the Range Points (page 10)
Set Damping (page 12)
Calibrate the sensor
Full Trim (page 19)
Zero Trim (page 18)
Reference Manual
00809-0100-4808, Rev EA
Calibrate the 4—20 mA output (digital-to-analog [D/A]
signal conversion)
4—20 mA Output Trim (page 21) or
4—20 mA Output Trim using other scale (page 21)
Figure 2-7 on page 17 illustrates the Rosemount 3051N Transmitter data flow. This data flow can be
summarized in four major steps.
1. A change in pressure is measured by a change in the sensor output (Sensor Signal).
2. The sensor signal is converted to a digital format that can be understood by the microprocessor
(Analog-to-Digital Signal Conversion).
3. Corrections are performed in the microprocessor to obtain a digital representation of the process
input (Digital PV).
4. The Digital PV is converted to an analog value (Digital-to-Analog Signal Conversion).
Figure 2-7 also identifies the approximate transmitter location for each calibration task. Note the data
flows from left to right, and a parameter change affects all values to the right of the changed parameter.
Not all calibration procedures should be performed for each Rosemount 3051N Transmitter. In addition,
some procedures are appropriate for bench calibration but should not be performed during field
calibration. Table 2-2 identifies the recommended calibration procedures for each type of Rosemount
3051N Transmitter for both bench and field calibration.
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Reference Manual
C
D
A
H
F
20.00 mA
3051:PT-4001
1 ?Device Setup
Online
2PV100.00 inH2O
3AO20.00 mA
4LRV0.00 inH2O
5URV100.00 inH2O
Transmitter Ranged 0 to 100 inH2O
I
B
E
G
00809-0100-4808, Rev EA
Figure 2-7. Transmitter Data Flow with Calibration Options
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March 2021
A. Sensor
B. Sensor signal
C. Transmitter electronics module
D. Microprocessor digital PV
E. Analog output
F. Output device
G. HART Communicator
H. Input device
I. Input pressure
Note
Value on PV line should equal the input pressure. Value on AO line should equal the output device
reading.
2.12.2 Deciding which trim procedure to use
To decide which trim procedure to use, first determine whether the analog-to-digital section or the digital-to-analog section of the transmitter electronics is in need of calibration. To do so, refer to Figure 2-7
and perform the following procedure.
1. Connect a pressure source, a HART Communicator, and a digital readout device to the transmitter.
2. Establish communication between the transmitter and the communicator.
3. Apply pressure equal to the upper range point pressure (100 inH
4. Compare the applied pressure to the Process Variable (PV) line on the Communicator Online Menu. If
the PV reading on the communicator does not match the applied pressure, and the test equipment is
accurate, perform a sensor trim.
5. Compare the Analog Output (AO) line on the communicator online menu to the digital readout
device. If the AO reading on the communicator does not match the digital readout device, and the
test equipment is accurate, perform an output trim.
0, for example).
2
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Transmitter Functions
20 mA Point
4 mA Point
20 mA Point
4 mA Point
March 2021
2.12.3 Sensor trim
The sensor can be trimmed using either the full trim or the zero trim function. The trim functions vary in
complexity, and their use is application-dependent. Both trim functions alter the transmitter’s
interpretation of the input signal.
A zero trim is a single-point adjustment. It is useful when compensating for mounting position effects
and is most effective when performed with the transmitter installed in its final mounting position. Since
this correction maintains the slope of the characterization curve, it should not be used in place of a full
trim over the full sensor range.
When performing a zero trim, ensure the equalizing valve is open and all wet legs are filled to the correct
levels.
Note
Do not perform a zero trim on Rosemount 3051N Absolute Pressure Transmitters. A zero trim is
zero-based, and absolute pressure transmitters reference absolute zero. To correct mounting position
effects on a Rosemount 3051N Absolute Pressure Transmitter, perform a low trim within the full sensor
trim function. The low trim function provides a “zero” correction similar to the zero trim function but it
does not require the input to be zero-based.
Reference Manual
00809-0100-4808, Rev EA
Figure 2-8. Typical Zero vs. Non-Zero-Based Application
Nonzero-based level
application
A full trim is a two-point sensor calibration where two end-point pressures are applied, and all output is
linearized between them. Always adjust the low trim value first to establish the correct offset.
Adjustment of the high trim value provides a slope correction to the characterization curve based on the
low trim value. The factory-established characterization curve is not changed by this procedure. The trim
values allows performance to be optimized over a specified measuring range at the calibration
temperature.
Zero-based level application Zero-based flow application
2.12.4 Zero trim
HART Fast Keys
To calibrate the sensor with a HART Communicator using the Zero Trim function, perform the following
procedure.
1, 2, 3, 3, 1
18
1. Vent the transmitter and attach a communicator to the measurement loop.
2. From the communicator menu select 1Device setup > 2 Diagnostics and service > 3Calibration >
3Sensor trim > 1Zero trim to prepare to adjust the zero trim.
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