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- USA
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Ships within 48 hours · Estimated delivery Jul 11 - Jul 16
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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
4.8 ★★★★★
Based on 327 reviews
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Product Reviews
★★★★★ 3
Too tight
The socks are soft and pretty. They fit further down on the foot than I expected. However, they do not cover toe halves, which is what I was looking for. They were not comfortable, but they would be good for getting a pedicure.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 13, 2024
★★★★★ 5
Cute and Comfortable
I have now purchased at least three packs of these Freetoes, so that says something; I love to wear flip flops and sandals but while walking some distance they can chafe and cause foot issues so I use the socks as a buffer, they are attractive and comfortable, especially in warmer months, and have solved the chafing issue. Highly recommend!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 22, 2020
★★★★★ 2
GOOD IDEA, BAD RESULTS
As u walk it slides up to your ankle since there's nothing to secure it between the toes, ends up looking like you have a ankle bracelet. Fabric is NOT soft and comfy. Ended up giving them all away to the my cousin that was traveling with me, she had forgotten her socks so she was desperate for anything. She had the same problem as I but because she is obese so the socks fit snug on her so took a bit longer to hike up to her ankle. Im medium built.. I purchased 2 sets so it was a waste of my hard earned money.
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Reviewed in the United States on December 21, 2020
★★★★★ 5
x
Color: Nude, Size: Women 9-13
as described
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Reviewed in the United States on March 20, 2026
★★★★★ 1
Do not buy these
Color: Nude, Size: Women 9-13
These are terrible. They are designed to walk in. The first day I tried them on I walked about 20 steps and they basically ripped right off my feet. I didn’t think much of it and just thought ok I won’t walk in them I’ll just wear them to bed. The second pair that came with the order I wore to bed that night and woke up with holes tore in them. Terrible product
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Reviewed in the United States on March 22, 2026
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