Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 10 - Jul 15
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
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
4.6 ★★★★★
Based on 657 reviews
Sort
Product Reviews
★★★★★ 5
Awesome price for quality balls
Color: Four colors, Size: 5cm (ball only)
These balls are super bouncy and durable. My dog loves them and for the price these are totally worth it! I think they are as durable as nerf balls and equal in size, and much cheaper!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 19, 2025
★★★★★ 1
Rope comes out at the slightest force. Pointless tug toy!
Color: Four colors, Size: 6cm (with rope)
If your dog pulls on these (and why wouldn’t he?), the rope immediately comes out. Turns out they just fuse the ends of the nylon rope together, which is no match for a dog playing tug. Any dog, any level of pulling will dismantle these.
We’ve managed to reinsert the rope to a couple of these and KNOT it, which gives you a shorter rope but a toy that can withstand some play. But if I had wanted a DIY toy, I’d have used the balls and rope I already own.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 11, 2025
★★★★★ 3
Not for super chewers!
Color: Four colors, Size: 5cm (with rope), Color: Four colors, Size: 5cm (with rope)
These rope ball toys arrived today. My poodle puppy loves rope ball toys and playing tug of war. These didn’t last 10 minutes. For context, she is 1 y.o., 30 lbs., is not teething & has her adult teeth. She did this on her own- we were not playing tug of war at the time the toy fell apart. At least there are 3 more in the package & when the rope is done, we’ll still have the balls to play with.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 15, 2026
★★★★★ 4
Great for small dogs
Color: Four colors, Size: 5cm (ball only)
Durability
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 28, 2026
★★★★★ 5
Fun, Durable Balls for smaller heavy chewers
Color: Four colors, Size: 5cm (ball only)
Perfect size and strength for my small dog that is a heavy chewer! She hasn’t been able to destroy and chew up this one like she has with every other toy! Definitely chew resistant.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 26, 2026
recommand products
Sheridan Cream Fabric Sofa w/7 Pillows
874.00
Supmay Hard Travel Case for Canon Powershot G7 X Mark II/ G7 X Mark III Digital Camera, Protective Storage Bag with Zipper Mesh Pocket for Battery
27.70
Selens 4PCS 40x50cm Lighting Gels Filter CTO Flash Gel Orange Light 4 Color Correction Transparent Sheets Overlays for 800W Red Head Spotlight Strobe
31.31
Suitor Black Computer Desk
141.55
Reggie Pink Fabric Mirror
104.50