Product Overview

The Universal Temperature Transmitter NM121 is designed for reliable industrial temperature measurement across a wide range of applications. Supporting both thermocouple and PT100 resistance temperature sensor inputs, the transmitter converts temperature signals into a standard 4–20 mA analog output for easy integration with PLCs, DCS, SCADA, and industrial control systems.

Featuring an all-metal die-cast aluminum housing and 316 stainless steel wetted parts, the NM121 is suitable for demanding industrial environments. It offers a configurable measuring range from -200°C to 1800°C, optional HART communication, and optional 4-digit LED or LCD display for convenient local indication.

Designed with a two-wire configuration and IP65 protection, the NM121 provides stable, high-accuracy temperature monitoring for process control and industrial automation.

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Product Features

• Universal temperature transmitter for PT100 and thermocouple sensors
• User-configurable measuring range from -200°C to 1800°C
• Standard 4–20 mA analog output
• Optional HART communication
• Optional 4-digit LED or LCD display
• Multiple process connection options
• All-metal die-cast aluminum housing
• 316 stainless steel wetted parts
• High measurement accuracy
• Compact two-wire industrial design
• IP65 protection rating

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Applications

Industries

• Circulating Water Systems
• Cooling Water Systems
• Iron and Steel Industry
• Oil and Gas Industry
• Machinery Manufacturing
• Water Treatment
• Glass Industry

Typical Applications

• Process temperature monitoring
• Industrial equipment temperature measurement
• Cooling and circulating water systems
• Process automation
• Temperature signal transmission to PLC and DCS systems

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Technical Specifications

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Available Options

Sensor Options

• PT100 Class A
• Thermocouple
• PT1000 (Customized)

Display Options

• Without Display
• 4-digit LED Display
• 4-digit LCD Display

Communication

• Standard 4–20 mA
• Optional HART Protocol

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Selection Table

NM121	C2080	A	G12M	A	100	D08	Detailed Description
NM121-							universal temperature transmitter NM121
	C2080						Measurement range: -20…8°C
	C0100						Measurement range: 0…100°C
	C20100						Measurement range: -20…100°C (with pulse)
	C20150						Measurement range: -20…150°C (with pulse)
	C20250						Measurement range: -20…250°C (with pulse)
	C50100						Measurement range: -50…100°C (with pulse)
	C50250						Measurement range: 50…250°C (with pulse)
		A					4…20mA
		AH					4…20mA + HART output
			G12M				G1/2 external thread
			G01M				G1 external thread
			NIWI2MZ				1/2’NPT external thread
			NO1M				1’NPT external thread
			M27M				M27*2 external thread
				A			With neck tube (above 100°C)
				B			Without neck tube (below 100°C)
					100		Probe length: L=100mm (probe rod length can be customized)
						D06	Probe diameter: D06=6mm (length L≤1000mm)
						D08	D08=8mm
						D12	D12=12mm
						D15	D15=15mm

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Why Choose the Universal Temperature Transmitter NM121 ?

Accurate temperature measurement is essential for maintaining process stability and equipment reliability. The NM121 combines flexible sensor compatibility, configurable measuring ranges, and industrial-grade construction to meet the needs of a wide variety of temperature monitoring applications.

Universal Sensor Compatibility

Supports both PT100 resistance temperature sensors and thermocouples, allowing the transmitter to be used across different industrial temperature measurement systems.

Wide Measuring Range

The configurable measurement range from -200°C to 1800°C enables the NM121 to adapt to diverse process temperature requirements.

Flexible System Integration

Standard 4–20 mA output and optional HART communication simplify integration with PLCs, DCS, SCADA, and other industrial automation platforms.

Durable Industrial Design

The die-cast aluminum housing and 316 stainless steel wetted parts provide reliable performance in demanding industrial environments.

Easy Local Monitoring

Optional LED or LCD displays allow operators to view temperature values directly at the installation site.

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Application Case

Temperature Monitoring in Industrial Cooling Water Systems

Reliable temperature monitoring is essential for maintaining the stable operation of industrial cooling water and circulating water systems. The Universal Temperature Transmitter NM121 can be installed with a PT100 sensor or thermocouple to continuously measure process temperature and convert it into a standard 4–20 mA output signal.

The transmitted signal can be connected to a PLC, DCS, or SCADA system for real-time monitoring, process control, and equipment protection. Optional HART communication provides additional flexibility for applications requiring digital configuration and diagnostics.

With its configurable measurement range, robust metal housing, and IP65 protection, the NM121 is suitable for continuous temperature monitoring in cooling systems, steel production, water treatment facilities, oil and gas processing, machinery manufacturing, and glass production processes.

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Installation Notes

• Ensure the transmitter is matched with the appropriate PT100 or thermocouple sensor.
• Use the specified 10–30 VDC power supply.
• Complete wiring according to the two-wire terminal diagram.
• Select the appropriate measuring range before commissioning.
• Install in locations suitable for the specified ambient temperature range.

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Frequently Asked Questions (FAQ)

1. What sensors are compatible with the NM121?

The NM121 supports PT100 Class A and thermocouple inputs. PT1000 is available as a customized option.

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2. What is the measuring range?

The measuring range is user configurable from -200°C to 1800°C.

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3. What output signals are available?

The standard output is 4–20 mA (2-wire). HART communication is available as an optional feature.

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4. Is a local display available?

Yes. Users can choose a 4-digit LED display, LCD display, or a version without a display.

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5. What protection rating does the transmitter have?

The NM121 has an IP65 protection rating.

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6. What materials are used?

The housing is made from die-cast aluminum, while the wetted parts are manufactured from 316 stainless steel.

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7. Which industries is the NM121 suitable for?

It is suitable for circulating water systems, cooling water systems, steel production, oil and gas, machinery manufacturing, water treatment, and glass manufacturing.

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8. Can the measuring range be customized?

Yes. The measuring range can be configured within -200°C to 1800°C according to application requirements.

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Optional Services

• Customized measuring range configuration
• PT1000 sensor option
• HART communication option
• LED or LCD display option
• Instrument customization according to site requirements
• Installation and commissioning support

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Industries Served

The NM121 Series is widely used in:

• Petroleum and Petrochemical
• Oil and Gas
• Steel and Metallurgy
• Machinery Manufacturing
• Electric Power
• Water Treatment
• Glass Manufacturing
• Building Materials
• Food Processing
• Pharmaceutical Manufacturing
• Environmental Protection