Emerson Rosemount 644 Temperature Transmitter

Rosemount 644 is Emerson's most versatile industrial smart temperature transmitter, supporting HART 5/7, FOUNDATION Fieldbus, PROFIBUS PA three communication protocols. Available in head mount 644H, field mount integrated 644, DIN rail mount 644T three installation forms. Compatible with Pt100 RTD, all types thermocouple, mV, ohm signal input. Pass SIL2/SIL3 safety certification, ATEX/IECEx/GB3836 explosion-proof certificates, built-in full transient overvoltage protection, advanced sensor diagnostic functions, widely used in oil & gas, chemical, power, pharmaceutical, food & beverage industry harsh process temperature monitoring.

1. Ultra High Precision & Long Stability

• Standard Pt100 accuracy ±0.15°C, enhanced P8 option up to ±0.1°C

• Transmitter-sensor matching via Callendar-Van Dusen constants, cut system error by 75%

• 24-month stability: ±0.15% span or 0.15°C; RTD long-term drift ≤0.25°C within 5 years

• Fully encapsulated silicone circuit board, anti-vibration, anti-humidity

2. Complete Safety & Global Certifications

• IEC61508 SIL2 single use, SIL3 redundant safety instrument system certified

• Integral transient protection, resist lightning, welding, EMC interference (NAMUR NE21)

• ATEX, IECEx, CSA, GB3836 intrinsic safety & flameproof hazardous area approvals

• Optional stainless steel sanitary housing for biotech/pharma clean environment

3. Powerful Built-in Diagnostics (Reduce Downtime)

• Hot Backup dual sensor switching, no measurement interruption when single sensor fails

• Sensor drift alert, thermocouple degradation early warning

• Min/max temperature track, easy fault troubleshooting

• LOI local operation interface: on-site calibration without TREX communicator

4. Flexible Installation & Multiple Protocols

• Three mounting types: DIN head mount / field integral / cabinet DIN rail 644T

• Housing optional: aluminum / 316 stainless steel sanitary case

• Output: 4-20mA HART, FF Fieldbus, PROFIBUS PA, compatible all DCS/PLC systems

• Single / dual sensor input, support differential & average temperature calculation

• Oil & Gas: Wellhead, pipeline, refinery reactor temperature monitoring

• Chemical Industry: Reaction kettle, distillation tower, corrosive medium temperature measurement

• Power Plant: Boiler, steam pipeline, turbine auxiliary temperature control

• Pharmaceutical & Biotech: Sanitary pipeline, fermenter sterile temperature detection

• Food & Beverage: Sterilization line, brewing, food processing hygiene measurement

• Water Treatment, Metallurgy, Cement New Energy Battery Production

• Packing: Independent foam carton, original Emerson packaging with label

• Delivery Time: Stock items 3–7 working days, customized coded models 15–25 days

• Shipping Port: Shanghai / Ningbo / Qingdao

• Warranty: 12 months factory warranty, technical support lifelong

• Supply Capacity: 5000 pcs per month, bulk order discount available

Q1: What's the difference between 644H, 644, 644T?

A1: 644H = head mount, install inside thermowell connection head; 644 = field integral, explosion-proof housing connected directly with sensor; 644T = DIN rail mount, installed inside control cabinet.

Q2: Does it support TREX communicator configuration?

A2: Yes, all HART versions fully compatible with Rosemount TREX 475 hand communicator; LOI screen version can adjust parameters on-site without communicator.

Q3: Can it work in explosion hazardous area?

A3: Yes, with ATEX, IECEx, Chinese GB3836 explosion certificates, Ex ia intrinsic safety & Ex d flameproof options for Class I/II hazardous zones.

Q4: Is original Emerson brand new?

A4: All goods are 100% original new Emerson Rosemount factory products, complete original certificates, data sheets, factory serial number traceable.

Q5: Can I mix RTD and thermocouple input?

A5: Single unit supports single type sensor; dual input model can collect two same/different sensor signals, calculate average or differential temperature.

1. Authorized Emerson industrial instrument distributor, genuine product supply

2. Complete stock of Rosemount temperature/pressure transmitter series: 644, 3051, 248, 114 etc.

3. Professional instrument engineer team, provide model selection guide & technical after-sales support

4. Support customized model code, one-stop solution with thermowell & temperature sensor assembly

5. Export packaging standard, complete customs clearance documents (CO, invoice, packing list)

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