Product details
Weiss Industrial Thermowell | ENS12-75SS | 7.5″ Length | 304 Stainless Steel
Product Description
The ENS12-75SS is a precision-machined protective sleeve that facilitates the installation and removal of thermometers without the need to drain or depressurize the piping system. The “ENS” designation identifies this as a 304 Stainless Steel Stepped Stem thermowell. The stepped design (reducing the diameter at the tip) is specifically engineered to minimize thermal lag, providing a faster temperature response compared to straight-shank wells.
The “12” denotes the 1/2″ NPT process connection, making it ideal for smaller branch lines or equipment manifolds where space for a 3/4″ fitting is limited. The “75” indicates an overall length of 7.5 inches (190 mm). This length is specifically designed to house 6-inch (150 mm) stem thermometers, providing a 1.5-inch extension that clears standard thermal insulation in Dubai and Abu Dhabi plant rooms.
Key Features
- 304 Stainless Steel Durability: Provides excellent resistance to corrosion and oxidation in freshwater, chilled water, and general heating applications.
- Stepped Stem for Faster Response: The reduced tip diameter allows heat to transfer more quickly to the thermometer bulb for real-time monitoring.
- 5″ Total Length: Ideal for 6-inch stem thermometers, ensuring the sensor is deeply immersed in the fluid flow while the thermometer face remains accessible above the insulation.
- 1/2″ NPT Process Connection: A compact mounting size suitable for various piping configurations and equipment ports.
- Instrument Protection: Shields the thermometer stem from bending or damage caused by high-velocity fluid flow (Wake Frequency).
Technical Specifications
| Specification | Details |
| Brand | Weiss Instruments |
| Model | ENS12-75SS |
| Overall Length | 7.5″ (190 mm) |
| Insertion Length (U) | 6″ (150 mm) |
| Material | 304 Stainless Steel |
| Stem Design | Stepped Shank |
| Process Connection | 1/2″ NPT |
| Internal Thread | 1-1/4″ – 18 UNEF (Industrial Standard) |
| Application | HVAC / Chilled Water / Hot Water |
Frequently Asked Questions
- Q: Why use a 1/2″ NPT connection instead of 3/4″?
- A: 1/2″ NPT (ENS12) is typically used on smaller pipe sizes (under 4 inches) or where existing tapping ports on equipment are already 1/2″. For larger main headers, the 3/4″ NPT (ENS35) is more common.
- Q: Which thermometer fits this thermowell?
- A: It is designed to house any standard industrial glass or bimetal thermometer with a 6-inch stem, such as the Weiss A9VU6 or 9VBM6 series.
- Q: Is 304 Stainless Steel suitable for outdoor use?
- A: Yes, for most environments. However, if the installation is in a highly corrosive or coastal area near the sea in the UAE, 316 Stainless Steel (ESS series) may be preferred.