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Reference Manual
00809-0200-4728, Rev RA
Appendix A: Specifications and Reference Data
April 2015
Specifications and Reference Data
Power supply
An external power supply is required for HART devices. The transmitter operates on 12.0 to
42.4 Vdc transmitter terminal voltage with load resistance between 250 and 660 ohms. A
minimum of 17.75 Vdc power supply is required with a load of 250 ohms. Transmitter power
terminals are rated to 42.4 Vdc.
Temperature limits
Hardware and software failure mode
The 644 features software driven alarm diagnostics. The independent circuit is designed to
provide backup alarm output if the microprocessor software fails. The alarm directions
(HIGH/LO) are user-selectable using the failure mode switch. If failure occurs, the position of the
switch determines the direction in which the output is driven (HI or LO). The switch feeds into
the digital-to-analog (D/A) converter, which drives the proper alarm output even if the
microprocessor fails. The values at which the transmitter drives its output in failure mode
depends on whether it is configured to standard, custom, or NAMUR-compliant (NAMUR
recommendation NE 43, June 1997) operation. Tab le A -1 shows the alarm ranges available for
the device to be configured to.
Maximum load = 40.8 x (supply voltage – 12.0)
Operating limit Storage limit
With LCD Display
(1)
(1) LCD display may not be readable and display updates will be slower at temperature below -4 °F (-20 °C).
–40 to 175 °F
–40 to 80 °C
–50 to 185 °F
–45 to 85 °C
Without LCD Display –40 to 185 °F
–40 to 85 °C
–50 to 230 °F
–46 to 110 °C
Table A-1. Available Alarm Range
(1)
(1) Measured in milliamperes.
Standard NAMUR- NE 43 compliant
Linear Output: 3.9 ≤ I
(2)
≤ 20.5
(2) I = Process Variable (current output).
3.8 ≤ I ≤ 20.5
Fail High: 21 ≤ I ≤ 23 21 ≤ I ≤ 23
Fail Low: 3.5 ≤ I ≤ 3.75 3.5 ≤ I ≤ 3.6
4–20 mA dc
1322
1100
1000
750
500
250
0
10 12.0 20 30 40 42.4
Load (Ohms)
Supply Voltage (Vdc)
Operating Region
- 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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