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Description
Dust Opacity Monitor - MRU DM 401 (long)* DM 401 BROCHURE * Description Product Overview The DM 401 (long) is a double pass dust opacity monitoring system used for continuous in situ measurement for use in a short optical path length 79" to 393" (2m to 10m) Features Direct continuous measurement across stack Small, lightweight & low operating costs Simple installation, commissioning and operation No moving parts minimal maintenance PC based setup, control and data logging Long life green
* DM 401 BROCHURE *
Description
Product Overview
The DM 401 (long) is a double pass dust opacity monitoring system used for continuous in-situ measurement for use in a short optical path length 79" to 393" (2m to 10m)
Features
- Direct continuous measurement across stack
- Small, lightweight & low operating costs
- Simple installation, commissioning and operation
- No moving parts – minimal maintenance
- PC based setup, control and data logging
- Long-life green LED source
- High measuring accuracy
- Opacity or mg/m3 (*) after on site calibration according to VDI 2066
Double pass opacity and dust monitoring system used for continuous in-situ measurement.
Basic Equipment
- Direct continuous measurement across stack
- Small, lightweight & low operating cost
- Simple installation, commissioning and operation
- No moving parts – minimal maintenance
- PC based setup, control and data logging
- Long-life green LED source
- High accuracy
- Opacity or mg/m3 (*) after on site calibration according to VDI 2066
Technical Data
| Measuring ranges | |
|---|---|
| Opacity | 0 … 100 % opacity 10 … 1,000 mg/m3 dust (after on site calibration according VDI 2066) |
| Dimensions and other data | |
|---|---|
| Data transmission | galvanic isolated 4-20mA analog output RS485 with Modbus RTU protocol |
| PC-Interface | USB or RS485 |
| Media | only for non condensing flue gas |
| Accuracy | +/- 2 % |
| Housing | Aluminium die cast |
| Power supply | 22…24 Vdc / 20W |
| Protection class | IP 65 |
| Weight | appr. 10.72 lbs |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 23 reviews
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Product Reviews
★★★★★ 5
Big Investment for a Lifetime of Quality
Color: Natural (Yellow-white Ivory), Size: 2' x 3' (Natural)
Several reviews mentioned a smell lingering with the sheepskin even after being unpacked a few days. I did notice the smell when I unpacked it, but I would expect a slight odor from such an item. It was not overpowering and is completely gone after one month of having it laid out on a chest in our bedroom. It is very functional, can be sat on, knelt on, etc, but is easily brushed off and looks great! The quality is very good…someone in my family is on it every night, and we have experienced no shedding whatsoever.
Although the price is a big investment initially, I believe the quality is worthy. We plan to enjoy this beautiful sheepskin for a lifetime!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 31, 2025
★★★★★ 4
Love it, but terrible smell at first
Color: Natural (Yellow-white Ivory), Size: 2' x 3' (Natural), Color: Natural (Yellow-white Ivory), Size: 2' x 3' (Natural)
Really soft & my dog loves it. I used it as a throw over my couch for decor. The smell when I took it out of the package was probably one of the worst smells I’ve ever smelled. Like old broccoli or something. I left it outside to air out all day and that was gone.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 24, 2025
★★★★★ 5
Luxurious Feel
Color: Grey Beige, Size: 2' x 3' (Natural)
Love this so much I’m ordering another one. Perfect look for furniture accents or for your pets. High quality and luxurious feel.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 18, 2025
★★★★★ 1
Not premium quality! I've seen actual authentic ones before.
Color: Natural (Yellow-white Ivory), Size: 2' x 3' (Natural), Color: Natural (Yellow-white Ivory), Size: 2' x 3' (Natural)
Despite all the positive reviews, I believe this product is subpar. There are genuine sheep skin Hydes but this product is NOT it. There is no leather embossing showing authenticity, and many signs of strong chemical treatment. Smell is lingering and I've aired them for over two days. Not very comfortable since the fur is very thick and coarse, you would expect it to be softer for the price as well. Not premium quality. I ordered this for my children to sleep on at long evening Church services but now I will look to more niche sellers for a higher quality product.
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Reviewed in the United States on December 23, 2024
★★★★★ 5
Great valur
Size: 2' x 3' (Natural), Color: Gray Tipped
Soft and comfortable. Quality leather nsckrd. Genuine sheepskin. No off odors. I'm skinny and not on tailbone. Hoping this helps. The grey tipped is more of a bluish gray. Pretty but not s true gray.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 31, 2026
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