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Reference Manual
00809-0200-4728, Rev RA
Section 5: Operation and Maintenance
April 2015
Operation and Maintenance
EMF compensation allows the transmitter to provide sensor measurements that are unaffected
by unwanted voltages, typically due to thermal EMFs in the equipment connected to the
transmitter, or by some types of calibration equipment. If this equipment also requires steady
sensor current, the transmitter must be set to “Active Calibrator Mode.” However, the steady
current does not allow the transmitter to perform EMF compensation and as a result, a
difference in readings between the Active Calibrator and actual sensor may exist.
If a reading difference is experienced and is greater than the plant’s accuracy specification
allows, perform a sensor trim with “Active Calibrator Mode” disabled. In this case, an active
calibrator capable of tolerating pulsating sensor current must be used or the actual sensors
must be connected to the transmitter. When the Field Communicator, AMS Device Manager, or
the LOI asks if an Active Calibrator is being used when the sensor trim routine is entered, select
No to leave the “Active Calibrator Mode” disabled.
5.5 Trim the analog output
5.5.1 Analog output trim or scaled analog output trim
Perform an Output Trim or a Scaled Output Trim if the digital value for the primary variable
matches the plant’s standards but the transmitter’s analog output does not match the reading
on the output device. The output trim function calibrates the transmitter to a 4–20 mA
reference scale; the scaled output trim function calibrates to a user-selectable reference scale.
To determine the need for an output trim or a scaled output trim, perform a loop test
(“Performing a loop test” on page 36).
Figure 5-4. Measurement Dynamics of a SMART
™
Temperature Transmitter
5.5.2 Analog output trim
The Analog Output Trim allows the transmitter’s conversion of the input signal to a 4–20 mA
output to be altered (Figure 5-4). Adjust the analog output signal at regular intervals to
maintain measurement precision. To perform a digital-to-analog trim, perform the following
procedure with Traditional Fast Key sequence:
Performing an analog output trim using a Field Communicator
1. Connect an accurate reference meter to the transmitter at the CONNECT REFERENCE
METER prompt by shunting the power to the transmitter through the reference meter
at some point in the loop.
Microprocessor
Digital-to-Analog
Signal Conversion
Analog-to-Digital Signal
Conversion
Transmitter electronics module
Analog
Input
Analog
Output
Field
Communicator
HART
Output
Sensor and Ohm/mV
Trim adjust the signal here
Output and Scaled Output
Trim adjust the signal here
- Protocol 1
- Rosemount 644 3
- Temperature Transmitter 3
- Title Page 4
- Contents 5
- 6Section 6: Troubleshooting 8
- Reference Manual 10
- Table of Contents 10
- Section 1 Introduction 11
- 1.2 Overview 12
- 1.2.2 Transmitter overview 13
- 1.3 Considerations 14
- 1.4 Return of materials 15
- 1.5 Transmitter security 16
- Section 2 Configuration 17
- 2.3 System readiness 18
- 2.4 Configuration methods 19
- Configuring with an LOI 21
- 2.4.4 Failure mode 22
- 2.5 Verify configuration 23
- 2, 2, 8, 6 26
- 2.6.3 Setting output units 28
- Setting output units with LOI 29
- Communicator 30
- 2, 2, 3, 3 31
- Resetting Hot Backup 33
- 2.8 Configure device outputs 35
- 2.8.2 Damping 36
- 2, 2, 1, 5 2, 2, 1, 6 38
- Configuring tag with LOI 43
- 2.10.1 50/60 Hz filter 44
- 2.10.2 Resetting the device 44
- 2.11 Diagnostics and service 46
- 2, 2, 4, 3, 4 48
- AMS terms 49
- Configure min/max with LOI 50
- Special considerations 53
- Hot Backup 53
- 3.1 Overview 55
- 3.2 Safety messages 55
- 3.3 Considerations 56
- 3.4 Installation procedures 57
- 3.4.1 Set the alarm switch 58
- 3.4.2 Mount the transmitter 59
- 3.4.3 Install the device 60
- 4.1 Overview 67
- 4.2 Safety messages 67
- 4.3.1 Sensor connections 69
- 4.3.2 Power the transmitter 70
- 4.3.3 Ground the transmitter 71
- Shielding recommendations 72
- Option 2 73
- Option 3 73
- Grounded thermocouple inputs 74
- (HART/4–20 75
- Electrical Installation 76
- Figure 4-4. Load Limits 76
- 5.1 Overview 77
- 5.2 Safety messages 77
- 5.3 Calibration overview 78
- 5.4 Sensor input trim 79
- 3, 4, 4, 1 80
- 3, 4, 4, 2 81
- 5.5 Trim the analog output 82
- 3, 4, 5, 1 83
- 3, 4, 5, 2 83
- 5.7 Switching HART Revision 86
- Section 6 Troubleshooting 87
- 6.4 Diagnostic messages 90
- (SIS) Certification 93
- 7.4 Commissioning 94
- 7.5 Configuration 95
- 7.7.1 Proof test 96
- 7.7.2 Partial proof test 96
- 7.8 Specifications 98
- 7.8.3 Product life 99
- A.1 Specifications 101
- A.1.2 Physical 102
- OUNDATION 103
- A.1.3 Performance 104
- Sensor connections 105
- Communication requirements 106
- Power supply 107
- Temperature limits 107
- Turn-on time 108
- External transient protection 108
- Accuracy 108
- Accuracy example 110
- OUNDATION fieldbus 111
- 644H (DIN A Head Mount) 113
- 644 Field Mount 114
- 644 Rail Mount 114
- Sanitary Applications 117
- A.4 Ordering information 118
- 00809-0200-4728, Rev RA 123
- April 2015 123
- 2 NPT 00644-4438-0002 126
- 2 NPT 00644-4438-0102 126
- 2 NPT 00644-4438-0004 126
- 2 NPT 00644-4438-0104 126
- A.4.1 Configuration 127
- A.4.2 Tagging 127
- A.4.3 Considerations 127
- Custom configuration 128
- Head Mount 129
- A.5.2 Physical specifications 130
- Enclosure ratings (644H) 131
- Sanitary housing surface 131
- Load limitations 133
- Configuration 135
- ≤ Ta ≤ +85°C); Type 4X; 137
- 2-14 NPT) enclosure 137
- International 140
- Gas -40 °C ≤ Ta ≤ +65 °C 142
- Dust -40 °C ≤ Ta ≤ +85 °C 142
- T5 -40 °C ≤ Ta ≤ +70 °C 145
- T6 -60 °C ≤ Ta ≤ +40 °C 145
- T5 -60 °C ≤ Ta ≤ +85 °C 145
- Combinations 146
- Additional Certifications 147
- Product Certifications 149
- Sheet 2 of 2 158
- Trees and Fast Keys 165
- D.1 Number entry 173
- D.2 Text entry 174
- 175
- Canceling 176
- D.5 LOI menu tree 177
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