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Reference Manual
00809-0200-4728, Rev RA
Section 4: Operation and Maintenance
April 2015
Electrical Installation
Thermocouple or millivolt inputs
The thermocouple can be connected directly to the transmitter. Use appropriate thermocouple
extension wire if mounting the transmitter remotely from the sensor. Make millivolt inputs
connections with copper wire. Use shielding for long runs of wire.
RTD or Ohm inputs
The transmitters will accept a variety of RTD configurations, including 2-wire, 3-wire or 4-wire. If
the transmitter is mounted remotely from a 3-wire or 4-wire RTD, it will operate within specifi-
cations, without recalibration, for lead wire resistances of up to 60 ohms per lead (equivalent to
6,000 feet of 20 AWG wire). In this case, the leads between the RTD and transmitter should be
shielded. If using only two leads, both RTD leads are in series with the sensor element, so
significant errors can occur if the lead lengths exceed three feet of 20 AWG wire (approximately
0.05 °C/ft). For longer runs, attach a third or fourth lead as described above.
Sensor lead wire resistance effect– RTD input
When using a 4-wire RTD, the effect of lead resistance is eliminated and has no impact on
accuracy. However, a 3-wire sensor will not fully cancel lead resistance error because it cannot
compensate for imbalances in resistance between the lead wires. Using the same type of wire
on all three lead wires will make a 3-wire RTD installation as accurate as possible. A 2-wire sensor
will produce the largest error because it directly adds the lead wire resistance to the sensor
resistance. For 2- and 3-wire RTDs, an additional lead wire resistance error is induced with
ambient temperature variations. The table and the examples shown below help quantify these
errors.
Note
For HART transmitters, the use of two grounded thermocouples with a dual option Rosemount
644 Transmitter is not recommended. For applications in which the use of two thermocouples is
desired, connect either two ungrounded thermocouples, one grounded and one ungrounded
thermocouple, or one dual element thermocouple.
4.3.2 Power the transmitter
1. An external power supply is required to operate the transmitter.
2. Remove the housing cover (if applicable).
3. Connect the positive power lead to the “+” terminal. Connect the negative power lead
to the “–” terminal.
– If a transient protector is being used, the power leads will now be connected to
the top of the transient protector unit. See the transient label for indication of
“+” and “-” terminal connections.
4. Tighten the terminal screws. When tightening the sensor and power wires, the max
torque is 6.5 in.-lbs (0.73 N-m).
5. Reattach and tighten the cover (if applicable).
6. Apply power (12 – 42 Vdc).
- 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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