K-type thermocouple plug SMPW-K-M HMPW-K-M are all available

K-type thermocouple plug SMPW-K-M HMPW-K-M are all available

OMEGA SMPW-K-M and HMPW-K-M are miniature Type K male thermocouple connectors used to create a stable detachable connection between Type K thermocouple wire and compatible temperature measuring equipment. Both models use the familiar ANSI yellow identification for Type K thermocouple circuits and feature a compact two-pin male plug configuration.

The SMPW-K-M is designed for general-purpose temperature measurement and uses a glass-filled nylon connector body with an operating temperature range of approximately -29°C to 180°C. For applications where the connector itself may be exposed to higher ambient temperatures, the HMPW-K-M uses a liquid crystal polymer body and is rated up to approximately 260°C.

These connectors are suitable for electronics manufacturing, SMT reflow profiling, industrial ovens, laboratory temperature testing, process equipment, maintenance departments, and temperature data acquisition systems where a compatible miniature Type K input is used.

Cause

Accurate thermocouple measurement depends not only on the sensing wire but also on the quality and suitability of every electrical connection in the measurement loop.

Several connection-related problems can affect temperature testing:

In SMT reflow profiling, even a small connection issue can interrupt a profile run. A thermocouple may be correctly attached to the PCB while the connection to the profiler remains unreliable because of a worn plug, loose terminal, damaged connector housing, or incorrect thermocouple polarity.

Using the correct Type K miniature thermocouple plug helps maintain a consistent connection from the sensing point to the measuring instrument.

Solution

The SMPW-K-M and HMPW-K-M provide two connector options for Type K temperature measurement systems.

SMPW-K-M for General Temperature Measurement

The SMPW-K-M uses a glass-filled nylon body and is suitable where the plug remains within its specified operating temperature range.

Typical uses include:

• SMT reflow temperature profiling
• Temperature data logger connections
• Laboratory measurement
• Industrial maintenance
• Oven temperature verification
• Thermocouple extension cable assemblies
• Process temperature monitoring

HMPW-K-M for Higher Connector Temperature Environments

The HMPW-K-M uses a liquid crystal polymer housing designed for higher ambient temperature exposure around the connector body.

This makes it useful where:

• The connector is positioned closer to a heated zone
• Higher ambient temperature resistance is required
• Conventional nylon connectors may approach their operating limit
• Temperature test equipment is used repeatedly in demanding production environments

The HMPW-K-M should not be selected simply because the measured process temperature is high. Selection should be based on the actual temperature experienced by the connector body.

Specifications

Main Specification Table

Model Comparison

The HMPW-K-M also accepts stranded or solid thermocouple wire up to approximately 20 AWG according to published product specifications.

Application

1. SMT Reflow Temperature Profiling

Type K thermocouples are widely used for checking PCB temperature profiles during soldering processes.

The connector can be fitted to compatible thermocouple wires used for measuring:

• Component body temperature
• PCB surface temperature
• Solder joint temperature
• Peak temperature
• Preheat temperature
• Soak-zone temperature
• Reflow-zone temperature
• Cooling rate

The plug allows the thermocouple cable to be connected and disconnected conveniently from compatible temperature profiling equipment.

2. Industrial Oven Monitoring

SMPW-K-M and HMPW-K-M can be used in thermocouple assemblies for:

• Reflow ovens
• Curing ovens
• Drying ovens
• Heat-treatment systems
• Laboratory ovens
• Environmental test equipment

For applications where the connector itself is located in a hotter area, HMPW-K-M should be considered because of its higher connector-body temperature rating.

3. Temperature Data Acquisition

A Type K thermocouple produces a small thermoelectric voltage corresponding to the temperature difference in the measurement circuit.

These plugs provide a detachable interface for connecting the sensor wiring to compatible:

• Temperature meters
• Temperature recorders
• Data loggers
• Process instruments
• Temperature profilers
• Measurement modules

4. Maintenance and Troubleshooting

Maintenance technicians can prepare reusable Type K extension leads with miniature connectors.

This is useful for:

• Machine temperature checks
• Heater troubleshooting
• Oven calibration support
• Production-line verification
• Process comparison
• Preventive maintenance
• Temporary measurement setups

Application Overview

How It Works

A Type K thermocouple uses two dissimilar thermoelectric conductors to generate a small voltage related to temperature.

The connector itself is not the sensing element. Its function is to maintain the thermocouple circuit while providing a convenient removable electrical connection.

Basic Measurement Chain

Type K Thermocouple Sensor → Thermocouple Wire → SMPW-K-M / HMPW-K-M Plug → Compatible Instrument Input → Temperature Reading

Connection Process

1. Prepare the Type K thermocouple wire

Remove only enough insulation to make the terminal connection. Avoid unnecessarily exposing long sections of conductor.

2. Identify polarity

Confirm the positive and negative Type K conductors before installation.

Correct polarity is important because reversing the connection can cause incorrect temperature behavior.

3. Open the connector

Access the internal terminals according to the connector construction.

4. Attach the conductors

Secure each thermocouple conductor to the correct terminal.

The conductor should be held firmly without loose strands or unreliable contact.

5. Check mechanical security

Make sure the cable enters the connector correctly and is not under excessive mechanical tension.

6. Connect to the instrument

Insert the male thermocouple plug into a compatible miniature Type K female thermocouple socket.

7. Verify the reading

Before production testing, check that the displayed temperature responds correctly when the sensing junction is heated.

Why Connector Material Matters

The temperatures measured by a thermocouple and the temperature experienced by the connector are not necessarily the same.

For example, a thermocouple junction may measure a PCB peak temperature above 230°C while the connector remains outside the oven or inside a protected profiler environment at a substantially lower temperature.

Therefore, the connector should be selected according to the temperature at the connector location, not only the temperature being measured.

Connector Selection Example

How To Choose

Selecting the right thermocouple connector should begin with the measuring system rather than connector appearance alone.

1. Confirm Thermocouple Type

These models are specifically for:

Type K thermocouples

Do not substitute them for Type J, T, E, N, R, S, or other thermocouple calibrations.

2. Confirm Connector Gender

Both models listed here are:

Male thermocouple plugs

The mating instrument or cable connector therefore needs a compatible miniature female thermocouple input.

3. Confirm Connector Size

SMPW-K-M and HMPW-K-M are miniature-style connectors.

Miniature and standard-size thermocouple connectors are physically different and should not be assumed interchangeable.

4. Check Connector Temperature

Choose according to the highest expected connector-body temperature.

5. Check Your Thermocouple Wire

Before ordering, provide:

• Thermocouple type
• Wire diameter or AWG
• Solid or stranded conductor
• Insulation material
• Required cable length
• Quantity
• Operating environment

This information helps confirm whether the connector and wire combination is appropriate.

6. Confirm Instrument Input

If the plug will be used with a temperature profiler, recorder, thermometer, or data logger, verify that the equipment uses a miniature Type K thermocouple input.

A Type K marking alone does not guarantee that the physical plug size is correct.

SMPW-K-M vs HMPW-K-M

The two models perform the same basic electrical connection function, but their housing materials and temperature capabilities differ.

For most applications, choosing between the two models mainly depends on the thermal environment around the plug.

Advantages for Temperature Testing

Compact Miniature Format

The miniature design helps reduce cable bulk when multiple thermocouple channels are used.

This can be especially useful when several sensors are connected to one temperature profiler.

Clear Type K Identification

The ANSI yellow housing helps technicians quickly recognize the Type K connection during installation and maintenance.

Detachable Connection

Instead of permanently wiring the thermocouple directly into the measuring instrument, the plug provides a convenient removable interface.

This helps simplify:

• Sensor replacement
• Profile setup
• Cable storage
• Maintenance
• Channel organization

Two Temperature Options

Customers can select the general-purpose SMPW-K-M or higher-temperature HMPW-K-M according to the actual operating environment.

Ordering Guide

For faster quotation and specification confirmation, please provide the following information with your inquiry:

Both SMPW-K-M and HMPW-K-M can be supplied according to customer requirements and order quantity.

FAQ

Q1: What is the main difference between SMPW-K-M and HMPW-K-M?

The main difference is the connector-body material and temperature capability. SMPW-K-M uses glass-filled nylon and is rated to approximately 180°C, while HMPW-K-M uses liquid crystal polymer and is designed for connector temperatures up to approximately 260°C.

Q2: Can these plugs be used for SMT reflow temperature profiling?

Yes. They can be used with Type K thermocouple wires for SMT reflow profiling when the profiler or measuring equipment has a compatible miniature Type K female input. Always verify connector size and instrument interface before ordering.

Q3: Are SMPW-K-M and HMPW-K-M standard-size thermocouple plugs?

No. They are miniature Type K male thermocouple plugs. Miniature and standard thermocouple connector formats have different physical dimensions, so confirm the socket type on your instrument before purchase.

Q4: Should I always choose HMPW-K-M for a 250°C reflow profile?

Not necessarily. A thermocouple may measure 250°C while the plug remains much cooler. Choose the connector according to the temperature experienced by the connector body. HMPW-K-M is appropriate when the plug itself requires higher temperature resistance.

Q5: What information should I provide before requesting a quotation?

Please send the required part number, quantity, thermocouple wire specification, wire gauge, application, expected connector temperature, and measuring instrument model or connector type. This helps us confirm compatibility and prepare an accurate quotation quickly.

Contact Us

Looking for SMPW-K-M, HMPW-K-M, Type K thermocouple plugs, thermocouple wire, or temperature profiling accessories?

Send us your required part number, quantity, wire specification, application, and destination country. Our team can help confirm the appropriate connector option and prepare a quotation for sample quantities, maintenance requirements, or regular production orders.

For temperature profiling projects, you may also send your existing connector photo and thermocouple wire specification for compatibility checking before ordering.