Product details
Weiss Bimetal Dial Thermometer | 5VBM9-20-120 | 5″ Dial | 9″ Stem
Product Description
The 5VBM9-20-120 is engineered for environments where temperature must be monitored clearly from a distance. The “5VBM” designation identifies this as a 5-inch (125 mm) Dial thermometer with a Vertical (Bottom) Mount connection. This orientation is ideal for installation on top of horizontal pipelines, ensuring the large dial faces the operator upright in Dubai and Abu Dhabi plant rooms.
This model features a versatile range of -20 to 120°F (-30 to 50°C), making it exceptionally well-suited for Chilled Water (CHW) and refrigeration systems that may experience sub-freezing conditions. The 9-inch (225 mm) stem is specifically designed for large-diameter pipes or headers with thick thermal insulation, ensuring the bimetal sensing element reaches deep into the fluid flow for a rapid and accurate thermal reading.
Key Features
- Massive 5″ High-Visibility Dial: The oversized display with bold black markings allows technicians to check critical cooling temperatures from a distance, improving efficiency in large facilities.
- 9″ Extra-Long Industrial Stem: Provides the necessary reach for large pipelines and heavily insulated systems common in UAE district cooling plants.
- All-Stainless Steel Construction: Both the case and the stem are crafted from 304 Stainless Steel, providing superior resistance to the high humidity and corrosive air of the Middle East.
- Hermetically Sealed Case: Vacuum-sealed to prevent internal fogging and moisture ingress, essential for maintaining clarity in chilled water applications where condensation is prevalent.
- External Recalibration: Includes an easy-to-use adjustment screw on the back of the case for simple field calibration.
Technical Specifications
| Specification | Details |
| Brand | Weiss Instruments |
| Model | 5VBM9-20-120 |
| Dial Size | 5″ (125 mm) |
| Stem Length | 9″ (225 mm) |
| Range | -20 to 120°F / -30 to 50°C |
| Mounting Type | Vertical (Bottom) Mount |
| Connection Size | 1/2″ NPT |
| Case Material | 304 Stainless Steel |
| Internal Type | Bimetal Helix |
| Accuracy | $\pm$
1% of Span (ASME B40.3 Grade A) |
Frequently Asked Questions
- Q: Why use the 9″ stem instead of a standard 4″ or 6″ stem?
- A: Large district cooling pipes often have 2-3 inches of insulation. The 9″ stem ensures the sensor bypasses the insulation and reaches the actual fluid flow in large-diameter pipes.
- Q: Is the dial glass or plastic?
- A: This model typically features a heavy-duty Instrument Glass window for maximum clarity and scratch resistance.
- Q: Does this require a thermowell?
- A: For pressurized piping, it must be installed in a 9″ Weiss Thermowell (typically model E9-35BS) to allow for safe maintenance without system shutdown.