Product details
PRODUCT DESCRIPTION
The BM Series Hot Water Bimetal Dial Thermometers by Weiss Instruments are designed for accurate temperature measurement in hot water, HVAC, and plumbing systems. These thermometers are built with a durable zinc plated brass case and chrome plated ring, ensuring reliable performance and long service life.
Featuring a rear connection design, the BM Series supports multiple mounting configurations including thermowell, spring mount, and magnetic mount, making it suitable for a wide range of installation requirements.
Available in 2.5″ and 4″ dial sizes with multiple temperature ranges, this series provides flexibility and ease of use for both residential and industrial applications.
KEY FEATURES
2.5″ and 4″ dial size options
Rear connection design
Zinc plated brass case
Chrome plated brass ring
Glass window
External recalibrator
Multiple mounting options (thermowell, spring, magnetic)
Suitable for hot water and HVAC applications
TECHNICAL SPECIFICATIONS
| Specification | Details |
|---|---|
| Series | BM |
| Brand | Weiss Instruments |
| Type | Bimetal Thermometer |
| Dial Size | 2.5″ / 4″ |
| Connection Type | Rear Connect |
| Case Material | Zinc Plated Brass |
| Ring | Chrome Plated Brass |
| Window | Glass |
| Dial | White aluminum with black and red markings |
| Pointer | Black finished aluminum |
| Stem Material | Brass |
| Accuracy | ±5°F (±2°C) |
| Ambient Temperature | -40°C to 120°C |
ITEM NUMBERS / MODELS
| Model | Dial Size | Connection | Temperature Range |
|---|---|---|---|
| HWBM25 | 2.5″ | 1/2″ NPT Brass Thermowell | 30–250°F |
| HWBM40 | 4″ | 1/2″ NPT Brass Thermowell | 30–250°F |
| HWBM25S | 2.5″ | 3/4″ Sweat Thermowell | 30–250°F |
| HWBM40S | 4″ | 3/4″ Sweat Thermowell | 30–250°F |
| SP25BM-250 | 2.5″ | Spring Mount | 30–250°F |
| SP25BM-500 | 2.5″ | Spring Mount | 50–500°F |
| MG25BM-250 | 2.5″ | Magnetic Mount | 30–250°F |
| MG25BM-500 | 2.5″ | Magnetic Mount | 50–500°F |
APPLICATIONS
HVAC systems
Hot water systems
Boilers
Plumbing systems
Industrial heating applications
