Factory Original Emerson Rosemounte 644 Head Mounted Wireless Temperature Transmitter Module

• Customization: Available
• Type: Network Type
• Measuring Medium: Temperature
• Model NO.: Rosemount 644 Temperature Module
• Display Type: LCD
• Site Display: Site Display
• Accuracy: ±0.1% of Span (Rtd)
• IP Rating: IP67
• Certification: CE
• Customized: Customized
• Product Name: Emerson Rosemount 644 Wireless Temperature Transmi
• Model: Rosemount 644 Head-Mounted Wireless Temperature Tr
• Type Category: Head-Mounted Wireless Temperature Transmitter
• Input Sensor Types: Rtd (PT100, PT1000), Thermocouple
• Communication Protocol: Wirelesshart® (IEC 62591)
• Power Supply: Internal Lithium Battery (3.6 V, 2.4 Ah)
• Temperature Range: 200°c to 850°c
• Battery Life: up to 10 Years
• Output Signal: Digital Wirelesshart Signal (No Analog Output)
• Signal Update Rate: -Configurable From 2 Seconds to 30 Minutes
• Certifications: ATEX, Iecex, FM, CSA, Sil 2, IP66/IP67, Namur Ne43
• Operating Temperature: -40°c to +85°c
• Material: Housing: Aluminum or Stainless Steel; Sensor
• Mounting Options: Direct Head-Mount Installation
• Diagnostic Features: Battery Health, Sensor Drift Detection
• Transport Package: Support Air/Land/Sea Transportation
• Specification: 40cm*30cm*30cm*
• Trademark: Emerson
• Origin: China
• HS Code: 8477900000
• Production Capacity: 1000
• Package Size: 15.00cm * 15.00cm * 15.00cm
• Package Gross Weight: 0.300kg

Product Description

Products Picture

Specification

Emerson Rosemount 644 Head-Mounted Wireless Temperature Transmitter Module
Parameter	Specification
Model	Rosemount 644 Head-Mounted Wireless Temperature Transmitter
Type	Head-mounted wireless temperature transmitter (WirelessHART®)
Input Sensor Types	RTD (Pt100, Pt1000), Thermocouple (Types J, K, T, E, N, R, S, B)
Communication Protocol	WirelessHART® (IEC 62591), compatible with Emerson Smart Wireless Gateways
Output Signal	Digital WirelessHART signal (no analog output)
Power Supply	Internal lithium battery (3.6 V, 2.4 Ah) or loop-powered via terminal block
Battery Life	Up to 10 years (typical, depending on update rate and environmental conditions)
Accuracy	±0.1°C (RTD), ±1.5°F (±0.8°C) for thermocouples
Temperature Range	-200°C to 850°C (-328°F to 1562°F) depending on sensor type
Signal Update Rate	Configurable from 2 seconds to 30 minutes (default: 30 seconds)
Certifications	ATEX, IECEx, FM, CSA, SIL 2, IP66/IP67, NAMUR NE43
Process Connection	Head-mounted (with thermowell), threaded (½–14 NPT, M20x1.5)
Environmental Rating	IP66/IP67, NEMA 4X; Explosion-proof optional (ATEX/IECEx Zone 1/2)
Operating Temperature	-40°C to +85°C (-40°F to 185°F)
Storage Temperature	-40°C to +85°C (-40°F to 185°F)
Material	Housing: Aluminum or Stainless Steel; Sensor: Per application (e.g., 316SS)
Mounting Options	Direct head-mount installation (with thermowell or sensor probe)

Product Description

Emerson Rosemount 644 Head-Mounted Wireless Temperature Module

The Emerson Rosemount 644 Head-Mounted Wireless Temperature Module is a cutting-edge solution designed to deliver precise, real-time temperature data in even the most challenging industrial environments. Leveraging WirelessHART® technology, this module eliminates the need for costly wiring and complex infrastructure, enabling seamless integration into existing process systems while providing unmatched flexibility for monitoring temperature in remote or hard-to-reach locations. Engineered for reliability, accuracy, and ease of use, the Rosemount 644 empowers industries to enhance operational efficiency, reduce maintenance costs, and achieve smarter process control.

Built with a head-mounted design, the 644 module mounts directly onto thermowells or sensor probes, simplifying installation and minimizing process disruption. It supports a wide range of RTD (Pt100/Pt1000) and thermocouple sensors (Types J, K, T, E, N, R, S, B), ensuring compatibility with diverse applications such as steam line monitoring, reactor temperature control, and flare gas measurement. The module's ±0.1°C RTD accuracy and ±1.5°F (±0.8°C) thermocouple accuracy meet global standards like IEC 60751 and ANSI MC96.1, guaranteeing dependable data for critical decision-making.

At the heart of the Rosemount 644 is its WirelessHART® communication protocol (IEC 62591), which enables secure, self-organizing mesh networks for robust signal reliability. Operating in the 2.4 GHz ISM band, it transmits data directly to Emerson Smart Wireless Gateways or distributed control systems (DCS), bypassing traditional wired infrastructure. This wireless capability not only reduces installation costs but also allows rapid deployment in temporary or retrofit applications. Users can configure the update rate from 2 seconds to 30 minutes, balancing responsiveness with energy efficiency to maximize battery life—up to 10 years under typical conditions.

Designed for durability, the 644 features a rugged aluminum or stainless steel housing with an IP66/IP67 rating, protecting against dust, water ingress, and extreme temperatures (-40°C to +85°C). It meets ATEX, IECEx, FM, and CSA hazardous area certifications, including Zone 1/2 approvals for explosive environments, ensuring safe operation in oil refineries, chemical plants.

Company Profile

Company Profile

KeRul (WeiFang) Automation Equipment Co., Ltd. is speciallzed in industrialautomation instrument development, production and sales, technical servicesand supporting equipment supply of specialized companies, The mainproducts are fow meters, level meters, temperature meters, pressuremeters, electrical meters, thermal meters, programmable controller(PLC), Dcs distributed control system, eight series of more than 1,000specifcations. its products and technologies are widely used in electrlcpower, metallurgy, petrochemical, environ. mental protection, plastics,food,l printing, tobacco, textile, dyeing and other fields.

Our Service

OEM / ODM services
To meet the user diversified requirement, Holykell have established a set of customer service and technical support system with OEM / ODM order as the center, and responded and Handle the customer's requirements in a timely manner to ensure accurate delivery time and product quality.
Order services
Fastest reply:Professional sales engineers 7/24 online services
Payment terms:T/T ,Western union, Paypal, Credit Card, L/C others
Fast delivery: within 24 hours release the cargo (normal spec.), Customized 7-12 days after payment .
 
MAINTENANCE & AFTER-SALES SERVICES
Customer Feedback:  Sales engineers and technical engineers will be one-on-one service for you to exclude all obstacles when use our sensors.
Warranty period: 12 months
Product life-long maintenance: Holykell can provide you with the maintenance of the whole life of the sensors

Packaging & Shipping

FAQ

Q: How long will you give me the reply? 
A: We will reply to you as soon as we see the information 
Q: What is the delivery time? 
A:The products in stock will be shipped after receiving the payment, and the products that need to be ordered are subject to the factory time. 
Q: How about your package? 
A: Do not worry about the package, we have rich experience in packing.
Q: How about the payment terms? 
A:You can choose T/T.