Product details
Weiss Industrial Thermowell | ER12-75BS | 7.5″ Length | Brass | 1/2″ NPT
Product Description
The ER12-75BS is a precision-machined protective housing that allows industrial thermometers to be installed or replaced without shutting down the system. The “ER” designation identifies this as a Reduced Tip (External) design, which features a tapered end to minimize thermal mass, ensuring a faster response time.
The “12” in the model number denotes a 1/2″ NPT process connection. This makes it ideal for smaller diameter pipes or equipment ports where a standard 3/4″ fitting is too large. Despite the “12” prefix, the “75” indicates the industry-standard overall length of 7.5 inches (190 mm). In Dubai and Abu Dhabi projects, this length is used to house 6-inch (150 mm) stem thermometers, providing a 1.5-inch neck that acts as a lagging extension to clear pipe insulation.
Key Features
- Compact 1/2″ NPT Connection: Specifically designed for smaller pipe sizes or restricted equipment manifolds where space is a premium.
- Superior Heat Transfer: The brass construction provides excellent thermal conductivity, allowing the thermometer to accurately track fluid temperatures in real-time.
- Reduced Tip for Fast Response: The tapered sensing end reduces thermal lag, making it perfect for high-efficiency HVAC and cooling systems.
- 5″ Total Length: Engineered to accommodate a 6-inch stem thermometer, ensuring the bulb is fully immersed in the fluid stream while clearing standard insulation.
- System Integrity: Allows for easy maintenance and calibration of thermometers without draining the system or risking leaks.
Technical Specifications
| Specification | Details |
| Brand | Weiss Instruments |
| Model | ER12-75BS |
| Overall Length | 7.5″ (190 mm) |
| Insertion Length (U) | 6″ (150 mm) |
| Material | Brass |
| Stem Design | Reduced Tip (Tapered) |
| Process Connection | 1/2″ NPT |
| Internal Thread | 1-1/4″ – 18 UNEF (Industrial Standard) |
| Application | HVAC / Chilled Water / Compact Piping |
Frequently Asked Questions
- Q: Why use 1/2″ NPT instead of 3/4″ NPT?
- A: 1/2″ NPT (ER12) is used when the pipe is too small to support a 3/4″ tap safely, or when the instrument ports on a chiller or boiler are pre-sized for 1/2″.
- Q: Is there a 12-inch version of this well?
- A: While the prefix “12” refers to the thread size (1/2″), Weiss does manufacture longer wells. If your project requires a 12-inch length, you would typically look for a model suffix of “120” (e.g., ER12-120BS).
- Q: Can this be used for potable water?
- A: For drinking water systems in the UAE, you should verify if the project requires the Lead-Free (LF) version (model ER12-75BSLF) to meet health regulations.