Detailed Product Description

Self-Organizing Networks
The self-forming, intelligent devices provide
exceptional data reliability and network stability. The
Rosemount 648 works the same as wired devices,
allowing you to leverage existing practices, training
and maintenance procedures, but without the added
wiring costs.
SmartPower
Emerson is the only provider of a power optimized
solution for both user and process safety. An
intrinsically safe power module allows field
replacements without removing the transmitter from
the process to keep personnel safe and reduce
maintenance costs. Power module installation
requires no special training. Keyed connections
eliminate the risk of incorrect installation. This
reliable solution provides long lasting power
technology life that delivers rich WirelessHART data.
Layered Security Keeps Your Network Safe
Emerson Process Managements layered approach
to wireless network security ensures that your
network stays protected. The network devices
implement Encryption, Authentication, Verification,
Anti-Jamming and Key Management methods to
ensure that data transmissions are secure.
Reliable Transmitter Performance
The 648 can be configured for a variety of sensor
inputs: RTD, thermocouple, millivolt, or ohm, and it
ensures top transmitter performance in harsh and/or
noisy EMI/RFI environments.
Transmitter-Sensor Matching
Entering the temperature-resistance profile specific
to the RTD sensor into the 648 transmitter results in
Transmitter-Sensor Matching. This eliminates the
sensor interchangeability error, which can improve
accuracy.
Integral LCD Display
Local indication of temperature measurement and
diagnostics provides real time and accurate
verification of process conditions.
Self-Organizing, Adaptive Mesh Routing
No wireless expertise required, devices
automatically find the best communication
paths
Network continuously monitors paths for
degradation and repairs itself
Adaptive behavior provides reliable, hands-off
operation and simplifies network deployments,
expansion and reconfiguration
Supports both star and mesh topologies
Industry Standard Radio with Channel Hopping
Standard IEEE 802.15.4 radios
2.4 GHz ISM band sliced into 16
radio-channels
Continually hop across channels to avoid
interference and increase reliability
Frequency hopping spread spectrum (FHSS)
technology delivers high reliability in
challenging radio environment
Self-Healing Network
If an obstruction is introduced into the mesh
network, devices will automatically find the
best alternate communication path. This
alternate path will be created and the
information will continue to flow.
Seamless Integration to Existing Hosts
Transparent and seamless integration
Same control system applications
Gateways connect using industry protocols.
Functional Specifications
Input
Supports Thermocouple, RTD, millivolt, and ohm input types. See
Accuracy on page 6 for sensor options.
Output
WirelessHART 2.4 GHz DSSS.
Wireless 2.4 GHz DSSS, or 900 MHz FHSS.
Local Display
The optional five-digit integral LCD Display can display
engineering units (°F, °C, °R, K, Ω, and millivolts). Display update
rate up to once per minute.
Humidity Limits
0100% relative humidity
Update Rate
WirelessHART, user selectable 8 sec. to 60 min.
Wireless, user selectable 15 sec. to 60 min.
Accuracy (Pt 100 @ reference condition: 20 °C)
±0.225 °C (±0.405 °F)
Physical Specifications
Electrical Connections
Power Module
Field replaceable, keyed connection eliminates the risk of incorrect
installation. Intrinsically Safe Lithium-thionyl chloride Power
Module with polybutadine terephthalate (PBT) enclosure.
Eight-year life at one minute update rate.(1)
Sensor Terminals
Sensor terminals permanently fixed to terminal block
HART Communicator Connections
Communication Terminals
Clips permanently fixed to terminal block
Materials of Construction
Enclosure
Housing - Low-copper aluminum or stainless steel
Paint - Polyurethane
Cover O-ring - Buna-N
Terminal Block and Power Module
PBT
Antenna
PBT/Polycarbonate (PC) integrated omnidirectional antenna
Mounting
Transmitters may be attached directly to the sensor. Mounting
brackets also permit remote mounting. See Dimensional
Drawings on page 10.
Weight
Low-copper Aluminum:
648 without LCD - 4.6 lbs. (2.0 kg)
648 with M5 LCD - 4.7 lbs (2.1 kg)
Stainless Steel:
648 without LCD - 8.0 lbs. (3.6 kg)
648 with M5 LCD - 8.1 lbs (3.7 kg)
Enclosure Ratings (648)
Housing option code D and E are NEMA 4X, and IP66.
Performance Specifications
ElectroMagnetic Compatibility (EMC)
All Models:
Meets all relevant requirements of EN 61326-1; 2006; EN
61326-2-3; 2006.
Transmitter Stability
The 648 has a stability of ±0.225% of output reading or 0.225 °C
(whichever is greater) for 24 months
Self Calibration
The analog-to-digital measurement circuitry automatically
self-calibrates for each temperature update by comparing the
dynamic measurement to extremely stable and accurate internal
reference elements.
Vibration Effect
No effect when tested per the requirements of IEC60770-1:
High Vibration Level - field or pipeline (10-60 Hz 0.21mm
displacement peak amplitude / 60-2000 Hz 3g).