The Miljoco-Weiss 3RBM4-300 is a rear connect bimetal dial thermometer with a 3″ 304 stainless steel case, a 4″ stem and a 50/300°F & 10/150°C dual-scale range, accurate to ±1.0% of full range per ASME B40.200.
The rear connect angle form brings the 1/2 NPT process connection out of the back of the case.
Temperature is sensed by a precision-formed bimetallic element with silicone dampening to maximize response time, and the pointer is reset using the external recalibrator on the rear of the case.
Specifications on this page are taken from the 3RBM Series datasheet, revision 3RBM-01.24.
Markets
The manufacturer lists this series for the following markets.
- Heavy process equipment
- Industrial petrochemical
- Oil and gas
- Pulp and paper processing
- Wastewater processing
- Food processing
Weiss bimetal thermometers should always be installed in a thermowell in pressurized applications to protect the stem from erosion and corrosion and to allow removal of the thermometer without disturbing the process.
Thermowells are a separate factory option and are not supplied with this thermometer. Consult the Weiss Thermowell Data Sheet for selection.
Key Features
3″ hermetically sealed case
304 stainless steel case, hermetically sealed, with a 304 stainless steel ring and gasket and a heavy strength glass window.
Accuracy ±1.0% of full range
Accuracy is stated to ±1.0% of full range per ASME B40.200 (B40.3 Grade A).
Rear connect angle form
The 1/2 NPT process connection exits the rear of the case in an angle form.
External recalibrator
An external recalibrator on the rear of the case allows the pointer to be reset without opening the instrument.
Silicone dampened element
A precision-formed bimetallic element with silicone dampening maximizes response time.
Dual °F and °C dial
The dial is graduated 50/300°F & 10/150°C with a 20° figure interval and 2° minor graduations.
Technical Specifications
| Model | 3RBM4-300 |
| Type | Bimetal dial thermometer |
| Dial Size | 3″ |
| Connection Form | Rear Connect |
| Temperature Range | 50/300°F & 10/150°C |
| Maximum Dial Reading | 300°F |
| Figure Interval | 20° |
| Minor Graduation | 2° |
| Accuracy | ±1.0% of full range, ASME B40.200 (B40.3 Grade A) |
| Case | 3″ 304 stainless steel, hermetically sealed |
| Ring | 304 stainless steel with gasket |
| Window | Heavy strength glass |
| Dial | White aluminum with black markings |
| Pointer | Black finished aluminum, adjustable |
| Recalibrator | External recalibrator on rear of case |
| Bimetallic Element | Precision-formed bimetallic element with silicone dampening to maximize response time |
| Stem | 300 series stainless steel, 0.250″ diameter, 4″ length including thread |
| Process Connection | 300 series stainless steel, 1/2 NPT, rear connect angle form |
| Ambient Temperature | -40 to 250°F (-40 to 120°C) |
Documentation
Related Products
Frequently Asked Questions
What temperature range does the 3RBM4-300 cover?
The dial is graduated 50/300°F & 10/150°C, with a 20° figure interval and 2° minor graduations. The maximum dial reading is 300°F.
What is the stem length and process connection?
The stem is 4″ long including the thread, 0.250″ in 300 series stainless steel, and the process connection is 300 series stainless steel, 1/2 NPT, rear connect angle form.
Where does the process connection exit on this model?
The 3RBM4-300 uses a rear connect angle form, so the 1/2 NPT connection exits the back of the case.
Does this thermometer need a thermowell?
Weiss bimetal thermometers should always be installed in a thermowell in pressurized applications to protect the stem from erosion and corrosion and to allow removal of the thermometer without disturbing the process. Thermowells are a separate factory option and are not supplied with this thermometer. Consult the Weiss Thermowell Data Sheet for selection.
Can the pointer be recalibrated in the field?
Yes. The 3RBM datasheet specifies an external recalibrator on the rear of the case, so the pointer can be reset without opening the instrument.
- Type:
- Bimetal Dial Thermometer
- Dial Size:
- 3 in
- Series:
- 3RBM
- Connection Form:
- Rear Connect Angle
- Stem Length:
- 4 in
- Temperature Range:
- 50/300°F & 10/150°C
- Accuracy:
- Plus or Minus 1.0 Percent of Full Range
- Case Material:
- 304 Stainless Steel
- Case Fill:
- Dry
- Connection Type:
- NPT
- Connection Size:
- 1/2 in
