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Dwyer Series 651 RTD Temperature Transmitter, 752°F, 4-20mA Output, Head-Mount - Standard Temperature Transmitters with Head-Mount
DwyerStandard Temperature Transmitters with Head-Mount

Dwyer Series 651 RTD Temperature Transmitter, 752°F, 4-20mA Output, Head-Mount

The Dwyer Series 651 Temperature Transducer (MPN 651A-40) is a standard head-mount temperature transmitter with an RTD sensing element. It measures process media temperatures up to 752 °F and provides a 4 to 20mA DC…

SKU 3G-OTH-178129

Also listed as: 651A40 · 651A 40

Brand
Dwyer
Item
Series 651 RTD Temperature Transmitter, 752°F, 4-20mA Output, Head-Mount
Category
Standard Temperature Transmitters with Head-Mount
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

Dwyer
Manufacturer Part Number
651A-40
Series
651
Type
RTD, 752°F Process Media Temp Measurement - Max
Power Required
4 to 20mA DC
Temperature Range
752 °F
Sensing Element Type
RTD
Temperature Accuracy
±0.2°C plus 0.2% reading

Technical Documents

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Dwyer Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The Dwyer Series 651 Temperature Transducer (MPN 651A-40) is a standard head-mount temperature transmitter with an RTD sensing element. It measures process media temperatures up to 752 °F and provides a 4 to 20mA DC output. The transmitter offers a temperature accuracy of ±0.2°C plus 0.2% of reading.

Frequently Asked Questions

What is the Dwyer 651A-40 temperature transducer used for?

The Dwyer 651A-40 is a head-mount RTD temperature transmitter used in industrial process control to measure media temperatures up to 752 °F. It outputs a 4 to 20mA DC signal for integration with PLCs, SCADA, and building automation systems in HVAC, chemical, and food processing plants.

What are the specifications of the Dwyer 651A-40?

The Dwyer 651A-40 is an RTD temperature transducer with a range of 752 °F and accuracy of ±0.2°C plus 0.2% of reading. It requires 4 to 20mA DC power and is part of the Series 651. The sensing element is RTD, and the unit is designed for head-mount installation.

Where to buy the Dwyer 651A-40 worldwide?

3G Electric supplies the Dwyer 651A-40 temperature transducer worldwide. As a global industrial distributor, we handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead time; we source and deliver this RTD transmitter to any country.

How to install the Dwyer 651A-40 temperature transmitter?

Mount the Dwyer 651A-40 in a standard head-mount enclosure. Connect the RTD sensor to the input terminals and the 4 to 20mA DC loop to the output. Ensure the process media temperature does not exceed 752 °F. Follow Dwyer's manual for wiring and calibration; use proper thermowell for high-temperature media.

Used in

Common applications for Dwyer
Combustion air-filter monitoring — Magnehelic Series 2000 on burner air-intake filter banks
Clean-room and pharmaceutical pressurisation — Magnehelic / Capsuhelic differential-pressure gauges
HVAC fan-discharge static pressure — Mark II inclined-vertical manometers on AHU test points
Filter-blockage alarms — Photohelic Series 3000 combined gauge/switch on air-handling units
BMS-integrated pressure monitoring — Digihelic DH3 with 4–20 mA output for building management

Dwyer Products

3G Electric supplies Dwyer standard temperature transmitters with head-mount. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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Compatible alternatives & equivalents

Cross-referenced by specification & description
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The Dwyer RHP-2D1B is a duct-mount transmitter for measuring temperature and humidity in HVAC air-handling systems. It outputs a 4 to 20mA DC signal proportional to both parameters, using a Type II Thermistor (10K @ 25°C) for temperature sensing with ±0.36°F accuracy at 77°F and a humidity sensor with 2% accuracy. The device operates on 10 to 35V DC power and covers a temperature range of -4 °F to 140 °F, with screw terminal connections
Dwyer RHCN-7000 duct-mount transmitter measures temperature and relative humidity in HVAC ducts. It provides a 4 to 20 mA output signal for building management systems and environmental control. Powered by 230V AC, it operates from 32°F to 158°F
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Dwyer RHCN-7000 duct-mount transmitter measures temperature and relative humidity in HVAC ducts. It provides a 4 to 20 mA output signal for building management systems and environmental control. Powered by 230V AC, it operates from 32°F to 158°F
This duct-mount transmitter continuously measures and transmits both temperature and relative humidity in HVAC ducts, cleanrooms, and industrial process air streams. It features a 4 to 20 mA output for interfacing with building management systems or PLCs, and operates on 110V AC power within a temperature range of 32°F to 158°F
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This duct-mount transmitter continuously measures and transmits both temperature and relative humidity in HVAC ducts, cleanrooms, and industrial process air streams. It features a 4 to 20 mA output for interfacing with building management systems or PLCs, and operates on 110V AC power within a temperature range of 32°F to 158°F
Duct-mount transmitter for simultaneous temperature and relative humidity measurement in HVAC air-handling systems. Provides a 4 to 20 mA output signal for integration with building automation or control panels. Operates over a temperature range of 32°F to 158°F and is powered by 110V AC
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Duct-mount transmitter for simultaneous temperature and relative humidity measurement in HVAC air-handling systems. Provides a 4 to 20 mA output signal for integration with building automation or control panels. Operates over a temperature range of 32°F to 158°F and is powered by 110V AC
Duct-mount transmitter for measuring humidity and temperature in HVAC air-handling units. Features Type III Thermistor (10K @ 25°C) sensing element, 2% humidity accuracy, ±0.36°F temperature accuracy at 77°F, and 4-20mA DC output. Operates on 10-35V DC power over -4°F to 140°F range
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Duct-mount transmitter for measuring humidity and temperature in HVAC air-handling units. Features Type III Thermistor (10K @ 25°C) sensing element, 2% humidity accuracy, ±0.36°F temperature accuracy at 77°F, and 4-20mA DC output. Operates on 10-35V DC power over -4°F to 140°F range

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The Dwyer Series 651 head-mount temperature transmitter uses an RTD sensing element to measure process media temperature up to 392°F. It operates on a 4-20mA DC loop power and provides an accuracy of ±0.2°C plus 0.2% of reading. This transmitter is suited for industrial temperature monitoring in HVAC, refrigeration, and process control systems
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The Dwyer TBU-00 is a head-mount temperature transmitter that accepts universal inputs from thermocouple, RTD, or thermistor sensors. It provides a 4 to 20 mA output with ±0.1% full scale accuracy for thermocouple inputs. Maximum operating temperature is 185°F. Suitable for industrial temperature monitoring and control applications
The Dwyer Series 651 head-mount temperature transmitter uses an RTD sensing element to measure process media temperature up to 212°F. It provides a 4-20mA DC output with an accuracy of ±0.2°C plus 0.2% of reading. Typical applications include temperature monitoring in HVAC, industrial processing, and fluid systems
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The Dwyer Series 651 head-mount temperature transmitter uses an RTD sensing element to measure process media temperature up to 212°F. It provides a 4-20mA DC output with an accuracy of ±0.2°C plus 0.2% of reading. Typical applications include temperature monitoring in HVAC, industrial processing, and fluid systems
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This head-mount temperature transmitter from Dwyer's Series 651 uses a K-type thermocouple to measure process media temperatures up to 392°F. It provides a 4-20mA DC output with an accuracy of ±0.1% FS plus cold junction errors, suitable for industrial temperature monitoring and control applications
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The Dwyer 651TC-04 is a head-mount temperature transmitter for industrial process media temperature measurement up to 752°F. It accepts K-type thermocouple input and provides a 4 to 20 mA DC output. Accuracy is ±0.1% FS plus cold junction errors. Typical applications include temperature monitoring in HVAC, chemical processing, and manufacturing
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