Cheap and New Rosemount 644 Temperature Transmitter

• Installation Type: Duct Type
• Sensing Type: Thermocouple
• Contact: Contact
• Model NO.: 644
• Output Signal Type: Digital Type
• Production Process: Normal Wirewound
• Material: Alumina
• Measuring Medium: Temperature
• IP Rating: IP67
• Certification: CE
• Customized: OEM
• Input Signal: 4-20 Ma
• Enclosure Rating: IP66/IP67
• Update Rate: 1 Second
• Temperature Range: -200°c to +850°c
• Accuracy: ±0.1°c
• Stability: ±0.05°c/Year
• Ambient Temp Effect: ±0.015% of Span/°c
• Power Supply: 10.5-55 VDC
• Loop Resistance: 600Ω Max @ 24VDC
• Operating Temperature: -40°c to +85°c
• Torage Temperature: -50°c to +100°c
• EMC: CE, FCC Part 15
• Safety: ATEX, Iecex, FM, CSA
• Brand: Rosemount
• Model: 644
• Transport Package: with Carton Package
• Specification: 30X30X30 cm
• Trademark: Rosemount
• Origin: USA
• HS Code: 9026201090
• Production Capacity: 50000

Product Description

Product Description

In the realm of industrial process control and monitoring, accurate temperature measurement is of paramount importance. The Rosemount 644 Temperature Transmitter emerges as a reliable and high-performance solution, designed to meet the diverse needs of various industries. Developed by Emerson, a global leader in automation and process management, the Rosemount 644 is engineered with state - of - the - art technology and a focus on precision, stability, and reliability.

Installation Flexibility

As mentioned earlier, the Rosemount 644 offers multiple installation options. The DINA - sized top - mounted and rail-mounted versions provide flexibility in installation location. The top-mounted version is suitable for applications where the transmitter needs to be installed on top of a sensor or in a remote location. The rail-mounted version, on the other hand, is ideal for installation in control panels or areas where space is limited and a more organized installation is desired. The availability of different housing options, including polished stainless-steel housings, makes the Rosemount 644 suitable for use in hygienic and biopharmaceutical applications, where strict cleanliness and corrosion-resistance requirements are in place.

Exceptional Accuracy

One of the standout features of the Rosemount 644 is its remarkable accuracy. For Pt100 RTDs, it offers a digital accuracy of ±0.15 °C (±0.27 °F). This high level of accuracy ensures that the temperature measurements are reliable and precise, which is crucial in applications where even small temperature variations can have a significant impact on the process. For example, in pharmaceutical manufacturing, precise temperature control is essential to ensure the quality and efficacy of drugs. The Rosemount 644's accuracy helps in maintaining the required temperature conditions, minimizing the risk of product defects.

 

High Stability

The Rosemount 644 Temperature Transmitter exhibits excellent stability. It has a stability of ±0.1% of the reading or ±0.1 °C, whichever is greater, over a period of 12 months for both RTD and thermocouple inputs. Some models even offer an impressive 5 - year stability. This long - term stability means that the transmitter can maintain accurate temperature measurements over an extended period without the need for frequent recalibration. In industrial processes that operate continuously for long periods, such as power generation plants or chemical refineries, the stable performance of the Rosemount 644 reduces maintenance costs and ensures consistent process operation.

Product Parameters

 

Category	Parameter	Specification
General	Model Number	644 (Standard), 644H (High Performance)
	Manufacturer	Emerson Automation Solutions
	Type	Smart Temperature Transmitter (HART & FOUNDATION Fieldbus)
Input	Sensor Types Supported	RTDs (Pt100, Pt200, Pt500, Pt1000, Ni120, Cu10) & Thermocouples (J,K,T,E,N,R,S,B)
	Temperature Range	-200°C to +850°C (-328°F to +1562°F) depending on sensor
Output	Analog Output	4-20mA HART (2-wire)
	Digital Protocols	FOUNDATION Fieldbus (optional)
	Update Rate	1 second (typical)
Performance	Accuracy	±0.1°C (±0.18°F) for RTDs, ±0.5°C (±0.9°F) for T/Cs
	Stability	±0.05°C/year
	Ambient Temp Effect	±0.015% of span/°C
Electrical	Power Supply	10.5-55 VDC (loop-powered)
	Loop Resistance	600Ω max @ 24VDC
	Intrinsic Safety	Available (Ex ia IIC T6 Ga)
Mechanical	Housing Material	Aluminum with epoxy coating (standard), 316SS (optional)
	Protection Rating	IP66/IP67 (NEMA 4X)
	Process Connection	1/2" NPT, G1/2, M20×1.5
Environmental	Operating Temperature	-40°C to +85°C (-40°F to +185°F)
	Storage Temperature	-50°C to +100°C (-58°F to +212°F)
	Vibration Resistance	5g @ 10-150Hz
Certifications	Safety	ATEX, IECEx, FM, CSA, SIL 2/3
	EMC	CE, FCC Part 15
Advanced Features	Sensor Diagnostics	Lead resistance check, sensor drift detection
	Custom Characterization	21-point RTD curve linearization
	Dual Sensor Input	Available on 644H models

Company Profile

KeRui (weifang) Automation Equipment Co., Ltd.specializes in industrial automation instrument development, production and sales, technical services, and supportingequipment supply of specialized companies. The main products are flow meters, level meters, temperature meters,pressure meters, electrical meters, thermal intelligent meters, programmable controllers (PLC)DCS distributed control systems,and eight series of more than 1,000 specifications. Its products and technologies are widely used in electric power, metallurgy, petrochemicals, environmental protection, plastics, food, printing, tobacco,textile, dyeing, and other felds.

Display of company strength

KeRui (Weifang) Automation Equipment Co., Ltd. has maintained a cooperative relationship with Rosemount for 15 years, and our purchase quantity has reached 20,000 units.
We supplied the tuning fork level gauge to the Rosemount factory, and it has been well-received by the Beijing factory. We have cooperated with Yokowaga and maintained a cooperative relationship for 8 years, and our purchase quality has reached 7000 units.
The companies we have cooperated with:
1. Awarded "Outstanding Supplier by Yanchang Petroleum in 2008
2. In December 2012, our company was awarded the "Excellent Equipment Service Award" for the expansion project of units 6 and 7 of the Guangdong Guohua Yuedaishan Power Plant
3. Awarded "Outstanding Supplier by Yaxing Group in 2013
4.200 transmitters for Haihua Group's ethylene debottlenecking transformation project in 2015.
5. In 2018, we were rewarded as a National Nuclear Power Instrumentation Industry Measurement and Testing Alliance member.
6.160 transmitters and 20 electric actuators for the Shandong Laigang Yongfeng Steel expansion project in 2019
7. In 2022, Jinneng Chemical (Qingdao) Co., Led/ Jinneng 2x450,000 tons/ year high-performance polypropylene project (newly built), equipped with 460 transmitters from our company.
8. In 2022, Shandong Qinghe Chemical Technology Co., Ltd.'s hydrogen peroxide method epoxy propane device and supporting hydrogen peroxide device expansion project used 253 pressure transmitters.
9. In 2022, the Wanhua Chemical HTN project NPG installed 320 transmitters and 50 sets of valve positioners.

 

FAQ

Q1: How long will it take you to give me the reply?
A: We will reply to you as soon as we see the information

Q2: What is the delivery time?
A: Our delivery time is within 3- 7 days after we get your payment; for large quantity mass orders, the time should be confirmed again with you

Q3: How about your package? 
A: Do not worry about the package. We have a lot of experience in packing, and all our packages are wooden case packages.

Q4: How about the payment terms?
A: You can choose T/T.

Q5: Do you provide samples? 
A: Yes, we have materials in stock to help you get the samples as soon as we can.

Q6: What is the MOQ?
A:1PC.

Q7: Can I get a lower price if I order large quantities? 
A: Yes, cheaper prices are available with larger orders.

 

Q8: Why choose us?
A: We have a perfect customization, not only to provide you with quality products, but also to have a professional customer service team available at any time to provide you with support. We pay more attention to establishing a long-term cooperative relationship with you to achieve continuous business growth.

 

Q9: How can we guarantee quality?
A: We have strict requirements on the quality of our products, and we will conduct a final inspection of our products when we ship them.