The WIKA Model 70 Expansion Thermometer is a mechanical temperature measuring instrument designed for general industrial applications where reliable local temperature indication and durable construction are essential.

Using the expansion principle, the instrument measures temperature without requiring an external power supply. Its robust stainless steel construction makes it suitable for applications involving mechanical stress and demanding operating conditions.

The Model 70 is available in different designs, including versions with capillaries and various process connections. These options allow the thermometer to be adapted to different installation requirements, including measurement points that are difficult to access or located some distance from the display.

Key Features

• Mechanical temperature measurement: Operates without an external power supply.
• Stainless steel construction: Designed for durability in industrial environments.
• Wide application versatility: Suitable for gaseous, liquid and highly viscous media, subject to configuration and compatibility.
• Flexible installation: Different mounting designs and process connections are available.
• Remote temperature reading: Capillary versions allow the display to be positioned away from the measurement point.
• Adaptable insertion lengths: Different stem lengths help accommodate varying installation requirements.
• Suitable for mechanical stress: Designed for general industrial applications with demanding operating conditions.
• Cost-effective operation: Provides straightforward temperature monitoring without the need for electrical measurement signals.

Suitable Applications

1. HVAC and Refrigeration Systems

The Model 70 can be used to monitor temperatures in heating, ventilation, air-conditioning and refrigeration equipment.

• Check operating temperatures at selected measurement points.
• Support routine equipment inspection and maintenance.
• Use suitable capillary versions when the display needs to be positioned away from the sensing point.

2. Industrial Machinery

Temperature monitoring is important for maintaining reliable machinery operation. The Model 70 provides direct visual indication for compatible equipment.

• Monitor temperatures at accessible machine measurement points.
• Support routine operating checks.
• Select an appropriate mounting design to suit the available installation space.

3. Chemical and Process Industries

The thermometer can be used for temperature monitoring of compatible gaseous, liquid and highly viscous process media.

• Check process temperatures during normal operation.
• Select suitable wetted materials and insertion lengths.
• Verify process pressure, temperature and chemical compatibility before installation.

Important: Suitability depends on the specific process medium and instrument configuration. Confirm all operating limits with the manufacturer's documentation.

4. Industrial Equipment and General Process Monitoring

For general industrial applications, the Model 70 offers a straightforward method of monitoring temperatures without relying on an external power supply.

• Provide local temperature indication for equipment operators.
• Support routine process monitoring.
• Choose a suitable connection and mounting arrangement for the installation.

5. Remote Measurement Points

Some installations place the temperature measurement point in a location that is difficult to access or inconvenient for direct reading. Capillary versions of the Model 70 allow the display to be installed at a more accessible position.

• Read temperatures from a convenient location.
• Accommodate selected installations where distance must be bridged between the sensing point and the display.
• Improve accessibility for routine inspection.

Technical Highlights & Selection Considerations

Before ordering the WIKA Model 70, confirm the following requirements to ensure the selected instrument is suitable for your application.

1. Temperature Measuring Range

Select a temperature range that covers the normal operating conditions and any expected temperature variations. The appropriate range depends on the process and the specific instrument configuration.

Always verify the available measuring ranges against the official datasheet for the selected model.

2. Installation and Mounting Design

The Model 70 is available in different mounting arrangements. Consider the location of the measurement point, the viewing angle and the available installation space.

For difficult-to-access locations, a capillary version may be more suitable than a directly mounted design.

3. Stem Length and Insertion Requirements

Choose an insertion length that allows the sensing element to measure the process temperature appropriately. Consider the dimensions of the equipment, the available installation depth and the characteristics of the process medium.

An unsuitable insertion length may affect measurement performance.

4. Process Connection

Verify the required thread standard, connection size and mounting arrangement before ordering. The process connection must match the equipment connection and provide a suitable installation for the intended operating conditions.

5. Material Compatibility

The Model 70 uses stainless steel construction, with the precise material specification depending on the relevant component and product version. Check the manufacturer's documentation to confirm compatibility with the process medium, operating temperature and environmental conditions.

6. Remote Reading Requirements

If the display needs to be installed away from the measurement point, select a suitable capillary configuration. Confirm the required capillary length, mounting accessories and installation arrangement for the intended application.

7. Replacement and Procurement

For replacement orders, provide the existing model number, full part number or a photograph of the instrument nameplate. This helps identify the correct measuring range, connection, insertion length and mounting design.

Frequently Asked Questions (FAQ)

Q1: What is the WIKA Model 70 Expansion Thermometer?

The WIKA Model 70 is a mechanical thermometer designed for industrial temperature measurement. It is suitable for compatible gaseous, liquid and highly viscous media and operates without an external power supply.

Q2: What industries use the Model 70?

Typical applications include HVAC systems, refrigeration, machine building and general industrial process monitoring. Suitability depends on the selected configuration and operating conditions.

Q3: Can the WIKA Model 70 measure temperature remotely?

Yes. Capillary versions allow the display to be positioned away from the measurement point, making them useful for installations that are difficult to access directly.

Q4: Does the Model 70 require an electrical power supply?

No. The Model 70 is a mechanical expansion thermometer that operates without an external power supply.

Q5: What should I check before purchasing the Model 70?

Confirm the measuring range, mounting design, stem length, process connection, capillary requirements and material compatibility. These parameters should match the installation and process conditions.

Q6: What information is needed for a quotation or replacement?

Provide the complete model or part number, required temperature range, mounting arrangement, insertion length, process connection and capillary requirements, if applicable. A nameplate photograph can also help with identification.