The Miljoco-Weiss 5VBM4-250 is a vari-angle bimetal dial thermometer with a 5″ 304 stainless steel case, a 4″ stem and a 0/250°F & -20/120°C dual-scale range, accurate to ±1.0% of full range per ASME B40.200.
The adjustable 304 stainless steel Vari-Angle bracket lets the dial be positioned so the scale faces the operator. The manufacturer advises adjusting the clevis only as needed during installation or removal of the thermometer.
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 5VBM Series datasheet, revision 5VBM-01.24. Dimensional data from the 3″ and 5″ Vari-angle submittal drawing (2007). Operating limits from IOM Form 124-0306-05.
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
A thermowell must be used on any application where the stem may be exposed to pressure, corrosive fluids or high velocity. A thermowell also allows the instrument to be exchanged or calibration-checked without shutting down 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
5″ 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).
Adjustable Vari-Angle connection
A 304 stainless steel adjustable bracket allows the dial to be angled so the scale can be read from the working position.
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 0/250°F & -20/120°C with a 20° figure interval and 2° minor graduations.
Technical Specifications
| Model | 5VBM4-250 |
| Type | Bimetal dial thermometer |
| Dial Size | 5″ |
| Connection Form | Vari-Angle |
| Temperature Range | 0/250°F & -20/120°C |
| Maximum Dial Reading | 250°F |
| Figure Interval | 20° |
| Minor Graduation | 2° |
| Accuracy | ±1.0% of full range, ASME B40.200 (B40.3 Grade A) |
| Case | 5″ 304 stainless steel, hermetically sealed |
| Ring | 304 stainless steel with gasket |
| Adjustable Bracket | 304 stainless steel, adjustable |
| 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 |
| Ambient Temperature | -40 to 250°F (-40 to 120°C) |
| Maximum Case Temperature | 200°F, dry case |
| Maximum Stem Exposure | Do not expose the stem above the maximum dial reading of 250°F |
| Minimum Stem Immersion | At least 2″ of the free end of the stem in the measured medium |
| Case Diameter (A) | 5-1/4″ |
| Dimension B | 15/16″ |
| Wrench Flat | 7/8″ hex |
Series continuous-exposure ceiling: 800°F (425°C). No bimetal thermometer should be exposed continuously above this figure. It is a series limit and does not override the model-specific maximum stem exposure of 250°F stated above.
Documentation
5VBM Series Datasheet- 3in and 5in Vari-Angle Bimetal Submittal Drawing
- 5VBM Installation, Operating and Maintenance Instructions
Related Products
Frequently Asked Questions
What temperature range does the 5VBM4-250 cover?
The dial is graduated 0/250°F & -20/120°C, with a 20° figure interval and 2° minor graduations. The maximum dial reading is 250°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.
How hot can the process be on this model?
Do not expose the stem to a temperature above the maximum dial reading of 250°F. Separately, no bimetal thermometer should be exposed continuously to process temperatures over 800°F (425°C).
How is the dial angle adjusted?
Loosen all four screws in the clevis assembly and rotate the assembly until the dial face can be tilted in the direction required, then tighten the two long clevis screws. Next, set the dial face angle by holding the stem and moving the face to the desired angle, and tighten the small clevis screws to lock it in place. The manufacturer advises adjusting the instrument only as needed during installation or removal.
Does this thermometer need a thermowell?
A thermowell must be used on any application where the stem may be exposed to pressure, corrosive fluids or high velocity. A thermowell also allows the instrument to be exchanged or calibration-checked without shutting down the process. Thermowells are a separate factory option and are not supplied with this thermometer. Consult the Weiss Thermowell Data Sheet for selection.
How should the thermometer be tightened?
Tighten using an open-end wrench on the hexagonal head of the threaded connection. Do not tighten by turning the thermometer case.
Can the pointer be recalibrated in the field?
Yes. An external recalibrator is fitted to the rear of the case. Turn the slotted hex reset with a small wrench, screwdriver or coin until the pointer reads correctly against a calibration bath or dry block operating at a known temperature.
- Type:
- Bimetal Dial Thermometer
- Dial Size:
- 5 in
- Series:
- 5VBM
- Connection Form:
- Vari-Angle Adjustable
- Stem Length:
- 4 in
- Temperature Range:
- 0/250°F & -20/120°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
